/*
 * HomeXMLHandler.java 15 sept. 2016
 *
 * Sweet Home 3D, Copyright (c) 2016 Emmanuel PUYBARET / eTeks <info@eteks.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package com.eteks.sweethome3d.io;

import java.io.IOException;
import java.math.BigDecimal;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Stack;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import com.eteks.sweethome3d.model.AspectRatio;
import com.eteks.sweethome3d.model.BackgroundImage;
import com.eteks.sweethome3d.model.Baseboard;
import com.eteks.sweethome3d.model.Camera;
import com.eteks.sweethome3d.model.CatalogDoorOrWindow;
import com.eteks.sweethome3d.model.CatalogLight;
import com.eteks.sweethome3d.model.CatalogPieceOfFurniture;
import com.eteks.sweethome3d.model.CatalogTexture;
import com.eteks.sweethome3d.model.Compass;
import com.eteks.sweethome3d.model.Content;
import com.eteks.sweethome3d.model.DimensionLine;
import com.eteks.sweethome3d.model.FurnitureCategory;
import com.eteks.sweethome3d.model.Home;
import com.eteks.sweethome3d.model.HomeDoorOrWindow;
import com.eteks.sweethome3d.model.HomeEnvironment;
import com.eteks.sweethome3d.model.HomeFurnitureGroup;
import com.eteks.sweethome3d.model.HomeLight;
import com.eteks.sweethome3d.model.HomeMaterial;
import com.eteks.sweethome3d.model.HomeObject;
import com.eteks.sweethome3d.model.HomePieceOfFurniture;
import com.eteks.sweethome3d.model.HomePrint;
import com.eteks.sweethome3d.model.HomeTexture;
import com.eteks.sweethome3d.model.Label;
import com.eteks.sweethome3d.model.Level;
import com.eteks.sweethome3d.model.LightSource;
import com.eteks.sweethome3d.model.ObserverCamera;
import com.eteks.sweethome3d.model.PieceOfFurniture;
import com.eteks.sweethome3d.model.Polyline;
import com.eteks.sweethome3d.model.Room;
import com.eteks.sweethome3d.model.Sash;
import com.eteks.sweethome3d.model.TextStyle;
import com.eteks.sweethome3d.model.TexturesCategory;
import com.eteks.sweethome3d.model.Transformation;
import com.eteks.sweethome3d.model.UserPreferences;
import com.eteks.sweethome3d.model.Wall;
import com.eteks.sweethome3d.tools.ResourceURLContent;
import com.eteks.sweethome3d.tools.URLContent;

/**
 * SAX handler for Sweet Home 3D XML stream. Read home should respect the following DTD:<pre>
 * &lt;!ELEMENT home (property*, furnitureVisibleProperty*, environment?, backgroundImage?, print?, compass?, (camera | observerCamera)*, level*,
 *       (pieceOfFurniture | doorOrWindow | furnitureGroup | light)*, wall*, room*, polyline*, dimensionLine*, label*)>
 * &lt;!ATTLIST home
 *       version CDATA #IMPLIED
 *       name CDATA #IMPLIED
 *       camera (observerCamera | topCamera) "topCamera"
 *       selectedLevel CDATA #IMPLIED
 *       wallHeight CDATA #IMPLIED
 *       basePlanLocked (false | true) "false"
 *       furnitureSortedProperty CDATA #IMPLIED
 *       furnitureDescendingSorted (false | true) "false">
 *
 * &lt;!ELEMENT property EMPTY>
 * &lt;!ATTLIST property
 *       name CDATA #REQUIRED
 *       value CDATA #REQUIRED>
 *
 * &lt;!ELEMENT furnitureVisibleProperty EMPTY>
 * &lt;!ATTLIST furnitureVisibleProperty name CDATA #REQUIRED>
 *
 * &lt;!ELEMENT environment (property*, (camera | observerCamera)*, texture?, texture?) >
 * &lt;!ATTLIST environment
 *       groundColor CDATA #IMPLIED
 *       backgroundImageVisibleOnGround3D (false | true) "false"
 *       skyColor CDATA #IMPLIED
 *       lightColor CDATA #IMPLIED
 *       wallsAlpha CDATA "0"
 *       allLevelsVisible (false | true) "false"
 *       observerCameraElevationAdjusted (false | true) "true"
 *       ceillingLightColor CDATA #IMPLIED
 *       drawingMode (FILL | OUTLINE | FILL_AND_OUTLINE) "FILL"
 *       subpartSizeUnderLight CDATA "0"
 *       photoWidth CDATA "400"
 *       photoHeight CDATA "300"
 *       photoAspectRatio (FREE_RATIO | VIEW_3D_RATIO | RATIO_4_3 | RATIO_3_2 | RATIO_16_9 | RATIO_2_1 | RATIO_24_10 | SQUARE_RATIO) "VIEW_3D_RATIO"
 *       photoQuality CDATA "0"
 *       videoWidth CDATA "320"
 *       videoAspectRatio (RATIO_4_3 | RATIO_16_9 | RATIO_24_10) "RATIO_4_3"
 *       videoQuality CDATA "0"
 *       videoSpeed CDATA #IMPLIED
 *       videoFrameRate CDATA "25">
 *
 * &lt;!ELEMENT backgroundImage EMPTY>
 * &lt;!ATTLIST backgroundImage
 *       image CDATA #REQUIRED
 *       scaleDistance CDATA #REQUIRED
 *       scaleDistanceXStart CDATA #REQUIRED
 *       scaleDistanceYStart CDATA #REQUIRED
 *       scaleDistanceXEnd CDATA #REQUIRED
 *       scaleDistanceYEnd CDATA #REQUIRED
 *       xOrigin CDATA "0"
 *       yOrigin CDATA "0"
 *       visible (false | true) "true">
 *
 * &lt;!ELEMENT print EMPTY>
 * &lt;!ATTLIST print
 *       headerFormat CDATA #IMPLIED
 *       footerFormat CDATA #IMPLIED
 *       planScale CDATA #IMPLIED
 *       furniturePrinted (false | true) "true"
 *       planPrinted (false | true) "true"
 *       view3DPrinted (false | true) "true"
 *       paperWidth CDATA #REQUIRED
 *       paperHeight CDATA #REQUIRED
 *       paperTopMargin CDATA #REQUIRED
 *       paperLeftMargin CDATA #REQUIRED
 *       paperBottomMargin CDATA #REQUIRED
 *       paperRightMargin CDATA #REQUIRED
 *       paperOrientation (PORTRAIT | LANDSCAPE | REVERSE_LANDSCAPE) #REQUIRED>
 *
 * &lt;!ELEMENT compass (property*)>
 * &lt;!ATTLIST compass
 *       x CDATA #REQUIRED
 *       y CDATA #REQUIRED
 *       diameter CDATA #REQUIRED
 *       northDirection CDATA "0"
 *       longitude CDATA #IMPLIED
 *       latitude CDATA #IMPLIED
 *       timeZone CDATA #IMPLIED
 *       visible (false | true) "true">
 *
 * &lt;!ENTITY % cameraCommonAttributes
 *      'id ID #IMPLIED
 *       name CDATA #IMPLIED
 *       lens (PINHOLE | NORMAL | FISHEYE | SPHERICAL) "PINHOLE"
 *       x CDATA #REQUIRED
 *       y CDATA #REQUIRED
 *       z CDATA #REQUIRED
 *       yaw CDATA #REQUIRED
 *       pitch CDATA #REQUIRED
 *       time CDATA #IMPLIED
 *       fieldOfView CDATA #REQUIRED'>
 *
 * &lt;!ELEMENT camera (property*)>
 * &lt;!ATTLIST camera
 *       %cameraCommonAttributes;
 *       attribute (topCamera | storedCamera | cameraPath) #REQUIRED>
 *
 * &lt;!ELEMENT observerCamera (property*)>
 * &lt;!ATTLIST observerCamera
 *       %cameraCommonAttributes;
 *       attribute (observerCamera | storedCamera | cameraPath) #REQUIRED
 *       fixedSize (false | true) "false">
 *
 * &lt;!ELEMENT level (property*, backgroundImage?)>
 * &lt;!ATTLIST level
 *       id ID #REQUIRED
 *       name CDATA #REQUIRED
 *       elevation CDATA #REQUIRED
 *       floorThickness CDATA #REQUIRED
 *       height CDATA #REQUIRED
 *       elevationIndex CDATA "-1"
 *       visible (false | true) "true"
 *       viewable (false | true) "true">
 *
 * &lt;!ENTITY % furnitureCommonAttributes
 *      'id ID #IMPLIED
 *       name CDATA #REQUIRED
 *       angle CDATA "0"
 *       visible (false | true) "true"
 *       movable (false | true) "true"
 *       description CDATA #IMPLIED
 *       modelMirrored (false | true) "false"
 *       nameVisible (false | true) "false"
 *       nameAngle CDATA "0"
 *       nameXOffset CDATA "0"
 *       nameYOffset CDATA "0"
 *       price CDATA #IMPLIED'>
 *
 * &lt;!ELEMENT furnitureGroup ((pieceOfFurniture | doorOrWindow | furnitureGroup | light)*, property*, textStyle?)>
 * &lt;!ATTLIST furnitureGroup
 *       %furnitureCommonAttributes;
 *       level IDREF #IMPLIED
 *       x CDATA #IMPLIED
 *       y CDATA #IMPLIED
 *       elevation CDATA #IMPLIED
 *       width CDATA #IMPLIED
 *       depth CDATA #IMPLIED
 *       height CDATA #IMPLIED
 *       dropOnTopElevation CDATA #IMPLIED>
 *
 * &lt;!ENTITY % pieceOfFurnitureCommonAttributes
 *      'level IDREF #IMPLIED
 *       catalogId CDATA #IMPLIED
 *       x CDATA #REQUIRED
 *       y CDATA #REQUIRED
 *       elevation CDATA "0"
 *       width CDATA #REQUIRED
 *       depth CDATA #REQUIRED
 *       height CDATA #REQUIRED
 *       dropOnTopElevation CDATA "1"
 *       information CDATA #IMPLIED
 *       model CDATA #IMPLIED
 *       icon CDATA #IMPLIED
 *       planIcon CDATA #IMPLIED
 *       modelRotation CDATA "1 0 0 0 1 0 0 0 1"
 *       modelCenteredAtOrigin CDATA #IMPLIED
 *       backFaceShown (false | true) "false"
 *       modelSize CDATA #IMPLIED
 *       doorOrWindow (false | true) "false"
 *       resizable (false | true) "true"
 *       deformable (false | true) "true"
 *       texturable (false | true) "true"
 *       staircaseCutOutShape CDATA #IMPLIED
 *       color CDATA #IMPLIED
 *       shininess CDATA #IMPLIED
 *       creator CDATA #IMPLIED
 *       valueAddedTaxPercentage CDATA #IMPLIED
 *       currency CDATA #IMPLIED'>
 *
 * &lt;!ENTITY % pieceOfFurnitureHorizontalRotationAttributes
 *      'horizontallyRotatable (false | true) "true"
 *       pitch CDATA "0"
 *       roll CDATA "0"
 *       widthInPlan CDATA #IMPLIED
 *       depthInPlan CDATA #IMPLIED
 *       heightInPlan CDATA #IMPLIED'>
 *
 * &lt;!ELEMENT pieceOfFurniture (property*, textStyle?, texture?, material*, transformation*)>
 * &lt;!ATTLIST pieceOfFurniture
 *       %furnitureCommonAttributes;
 *       %pieceOfFurnitureCommonAttributes;
 *       %pieceOfFurnitureHorizontalRotationAttributes;>
 *
 * &lt;!ELEMENT doorOrWindow (sash*, property*, textStyle?, texture?, material*, transformation*)>
 * &lt;!ATTLIST doorOrWindow
 *       %furnitureCommonAttributes;
 *       %pieceOfFurnitureCommonAttributes;
 *       wallThickness CDATA "1"
 *       wallDistance CDATA "0"
 *       wallWidth CDATA "1"
 *       wallLeft CDATA "0"
 *       wallHeight CDATA "1"
 *       wallTop CDATA "0"
 *       wallCutOutOnBothSides (false | true) "false"
 *       widthDepthDeformable (false | true) "true"
 *       cutOutShape CDATA #IMPLIED
 *       boundToWall (false | true) "true">
 *
 * &lt;!ELEMENT sash EMPTY>
 * &lt;!ATTLIST sash
 *       xAxis CDATA #REQUIRED
 *       yAxis CDATA #REQUIRED
 *       width CDATA #REQUIRED
 *       startAngle CDATA #REQUIRED
 *       endAngle CDATA #REQUIRED>
 *
 * &lt;!ELEMENT light (lightSource*, property*, textStyle?, texture?, material*, transformation*)>
 * &lt;!ATTLIST light
 *       %furnitureCommonAttributes;
 *       %pieceOfFurnitureCommonAttributes;
 *       %pieceOfFurnitureHorizontalRotationAttributes;
 *       power CDATA "0.5">
 *
 * &lt;!ELEMENT lightSource EMPTY>
 * &lt;!ATTLIST lightSource
 *       x CDATA #REQUIRED
 *       y CDATA #REQUIRED
 *       z CDATA #REQUIRED
 *       color CDATA #REQUIRED
 *       diameter CDATA #IMPLIED>
 *
 * &lt;!ELEMENT textStyle EMPTY>
 * &lt;!ATTLIST textStyle
 *       attribute (nameStyle | areaStyle | lengthStyle) #IMPLIED
 *       fontName CDATA #IMPLIED
 *       fontSize CDATA #REQUIRED
 *       bold (false | true) "false"
 *       italic (false | true) "false"
 *       alignment (LEFT | CENTER | RIGHT) "CENTER">
 *
 * &lt;!ELEMENT texture EMPTY>
 * &lt;!ATTLIST texture
 *       attribute (groundTexture | skyTexture | leftSideTexture | rightSideTexture | floorTexture | ceilingTexture) #IMPLIED
 *       catalogId CDATA #IMPLIED
 *       name CDATA #REQUIRED
 *       width CDATA #REQUIRED
 *       height CDATA #REQUIRED
 *       xOffset CDATA "0"
 *       yOffset CDATA "0"
 *       angle CDATA "0"
 *       scale CDATA "1"
 *       creator CDATA #IMPLIED
 *       leftToRightOriented (true | false) "true"
 *       image CDATA #REQUIRED>
 *
 * &lt;!ELEMENT material (texture?)>
 * &lt;!ATTLIST material
 *       name CDATA #REQUIRED
 *       key CDATA #IMPLIED
 *       color CDATA #IMPLIED
 *       shininess CDATA #IMPLIED>
 *
 * &lt;!ELEMENT transformation EMPTY>
 * &lt;!ATTLIST transformation
 *       name CDATA #REQUIRED
 *       matrix CDATA #REQUIRED>
 *
 * &lt;!ELEMENT wall (property*, texture?, texture?, baseboard?, baseboard?)>
 * &lt;!ATTLIST wall
 *       id ID #REQUIRED
 *       level IDREF #IMPLIED
 *       wallAtStart IDREF #IMPLIED
 *       wallAtEnd IDREF #IMPLIED
 *       xStart CDATA #REQUIRED
 *       yStart CDATA #REQUIRED
 *       xEnd CDATA #REQUIRED
 *       yEnd CDATA #REQUIRED
 *       height CDATA #IMPLIED
 *       heightAtEnd CDATA #IMPLIED
 *       thickness CDATA #REQUIRED
 *       arcExtent CDATA #IMPLIED
 *       pattern CDATA #IMPLIED
 *       topColor CDATA #IMPLIED
 *       leftSideColor CDATA #IMPLIED
 *       leftSideShininess CDATA "0"
 *       rightSideColor CDATA #IMPLIED
 *       rightSideShininess CDATA "0">
 *
 * &lt;!ELEMENT baseboard (texture?)>
 * &lt;!ATTLIST baseboard
 *       attribute (leftSideBaseboard | rightSideBaseboard) #REQUIRED
 *       thickness CDATA #REQUIRED
 *       height CDATA #REQUIRED
 *       color CDATA #IMPLIED>
 *
 * &lt;!ELEMENT room (property*, textStyle?, textStyle?, texture?, texture?, point+)>
 * &lt;!ATTLIST room
 *       id ID #IMPLIED
 *       level IDREF #IMPLIED
 *       name CDATA #IMPLIED
 *       nameAngle CDATA "0"
 *       nameXOffset CDATA "0"
 *       nameYOffset CDATA "-40"
 *       areaVisible (false | true) "false"
 *       areaAngle CDATA "0"
 *       areaXOffset CDATA "0"
 *       areaYOffset CDATA "0"
 *       floorVisible (false | true) "true"
 *       floorColor CDATA #IMPLIED
 *       floorShininess CDATA "0"
 *       ceilingVisible (false | true) "true"
 *       ceilingColor CDATA #IMPLIED
 *       ceilingShininess CDATA "0">
 *
 * &lt;!ELEMENT point EMPTY>
 * &lt;!ATTLIST point
 *       x CDATA #REQUIRED
 *       y CDATA #REQUIRED>
 *
 * &lt;!ELEMENT polyline (property*, point+)>
 * &lt;!ATTLIST polyline
 *       id ID #IMPLIED
 *       level IDREF #IMPLIED
 *       thickness CDATA "1"
 *       capStyle (BUTT | SQUARE | ROUND) "BUTT"
 *       joinStyle (BEVEL | MITER | ROUND | CURVED) "MITER"
 *       dashStyle (SOLID | DOT | DASH | DASH_DOT | DASH_DOT_DOT | CUSTOMIZED) "SOLID"
 *       dashPattern CDATA #IMPLIED
 *       dashOffset CDATA "0"
 *       startArrowStyle (NONE | DELTA | OPEN | DISC) "NONE"
 *       endArrowStyle (NONE | DELTA | OPEN | DISC) "NONE"
 *       elevation CDATA #IMPLIED
 *       color CDATA #IMPLIED
 *       closedPath (false | true) "false">
 *
 * &lt;!ELEMENT dimensionLine (property*, textStyle?)>
 * &lt;!ATTLIST dimensionLine
 *       id ID #IMPLIED
 *       level IDREF #IMPLIED
 *       xStart CDATA #REQUIRED
 *       yStart CDATA #REQUIRED
 *       xEnd CDATA #REQUIRED
 *       yEnd CDATA #REQUIRED
 *       offset CDATA #REQUIRED>
 *
 * &lt;!ELEMENT label (property*, textStyle?, text)>
 * &lt;!ATTLIST label
 *       id ID #IMPLIED
 *       level IDREF #IMPLIED
 *       x CDATA #REQUIRED
 *       y CDATA #REQUIRED
 *       angle CDATA "0"
 *       elevation CDATA "0"
 *       pitch CDATA #IMPLIED
 *       color CDATA #IMPLIED
 *       outlineColor CDATA #IMPLIED>
 *
 * &lt;!ELEMENT text (#PCDATA)>
 * </pre>
 * with <code>home</code> as root element.
 * Attributes named <code>attribute</code> indicate the names of the object fields
 * where some elements should be stored.
 * @author Emmanuel Puybaret
 */
public class HomeXMLHandler extends DefaultHandler {
  private HomeContentContext contentContext;
  private UserPreferences    preferences;
  private Home               home;

  private final StringBuilder     buffer  = new StringBuilder();
  private final Stack<String>     elements = new Stack<String>();
  private final Stack<Map<String, String>> attributes = new Stack<Map<String, String>>();
  private final Stack<List<HomePieceOfFurniture>> groupsFurniture = new Stack<List<HomePieceOfFurniture>>();
  private final Stack<Map<String, String>> properties = new Stack<Map<String, String>>();
  private final Stack<Map<String, TextStyle>> textStyles = new Stack<Map<String, TextStyle>>();
  private final Map<String, Level>      levels = new HashMap<String, Level>();
  private final Map<String, JoinedWall> joinedWalls  = new HashMap<String, JoinedWall>();

  private String homeElementName;
  private String labelText;
  private Baseboard leftSideBaseboard;
  private Baseboard rightSideBaseboard;
  private BackgroundImage homeBackgroundImage;
  private BackgroundImage backgroundImage;
  private final Map<String, HomeTexture>  textures = new HashMap<String, HomeTexture>();
  private final List<HomeMaterial>        materials = new ArrayList<HomeMaterial>();
  private final List<Transformation>      transformations = new ArrayList<Transformation>();
  private HomeTexture materialTexture;
  private final List<Sash>         sashes = new ArrayList<Sash>();
  private final List<LightSource>  lightSources = new ArrayList<LightSource>();
  private final List<float[]>      points = new ArrayList<float[]>();
  private final List<HomePieceOfFurniture.SortableProperty> furnitureVisibleProperties = new ArrayList<HomePieceOfFurniture.SortableProperty>();

  private static final String UNIQUE_ATTRIBUTE = "@&unique&@";

  public HomeXMLHandler() {
    this(null);
  }

  public HomeXMLHandler(UserPreferences preferences) {
    this.preferences = preferences != null ? preferences : new DefaultUserPreferences(false, null);
  }

  /**
   * Sets the context that will be used to lookup content referenced by the read home.
   */
  void setContentContext(HomeContentContext contentContext) {
    this.contentContext = contentContext;
  }

  @Override
  public void startDocument() throws SAXException {
    this.home = null;
    this.elements.clear();
    this.attributes.clear();
    this.groupsFurniture.clear();
    this.levels.clear();
    this.joinedWalls.clear();
  }

  @Override
  public void startElement(String uri, String localName, String name, Attributes attributes) throws SAXException {
    this.buffer.setLength(0);
    this.elements.push(name);
    Map<String, String> attributesMap = new HashMap<String, String>();
    for (int i = 0; i < attributes.getLength(); i++) {
      attributesMap.put(attributes.getQName(i), attributes.getValue(i));
    }
    this.attributes.push(attributesMap);
    if (!"property".equals(name)
        && !"furnitureVisibleProperty".equals(name)
        && !"textStyle".equals(name)) {
      this.properties.push(new HashMap<String, String>());
      this.textStyles.push(new HashMap<String, TextStyle>());
    }

    if ("home".equals(name)) {
      setHome(createHome(name, attributesMap));
      this.furnitureVisibleProperties.clear();
      this.homeBackgroundImage = null;
    } else if ("environment".equals(name)) {
      this.textures.clear();
    } else if ("level".equals(name)) {
      this.backgroundImage = null;
    } else if ("pieceOfFurniture".equals(name)
              || "doorOrWindow".equals(name)
              || "light".equals(name)
              || "furnitureGroup".equals(name)) {
      this.textures.clear();
      this.materials.clear();
      this.transformations.clear();
      this.sashes.clear();
      this.lightSources.clear();
      if ("furnitureGroup".equals(name)) {
        this.groupsFurniture.push(new ArrayList<HomePieceOfFurniture>());
      }
    } else if ("room".equals(name)) {
      this.textures.clear();
      this.points.clear();
    } else if ("polyline".equals(name)) {
      this.points.clear();
    } else if ("label".equals(name)) {
      this.labelText = null;
    } else if ("wall".equals(name)) {
      this.textures.clear();
      this.leftSideBaseboard = null;
      this.rightSideBaseboard = null;
    } else if ("baseboard".equals(name)) {
      this.textures.remove(UNIQUE_ATTRIBUTE);
    } else if ("material".equals(name)) {
      this.materialTexture = null;
    }
  }

  @Override
  public void characters(char [] ch, int start, int length) throws SAXException {
    this.buffer.append(ch, start, length);
  }

  @Override
  public void endElement(String uri, String localName, String name) throws SAXException {
    this.elements.pop();
    String parent = this.elements.isEmpty() ? null : this.elements.peek();
    Map<String, String> attributesMap = this.attributes.pop();
    if (this.homeElementName != null && this.homeElementName.equals(name)) {
      setHomeAttributes(this.home, name, attributesMap);
    } else if ("furnitureVisibleProperty".equals(name)) {
      try {
        if (attributesMap.get("name") == null) {
          throw new SAXException("Missing name attribute");
        }
        this.furnitureVisibleProperties.add(HomePieceOfFurniture.SortableProperty.valueOf(attributesMap.get("name")));
      } catch (IllegalArgumentException ex) {
        // Ignore malformed enum constant
      }
    } else if ("environment".equals(name)) {
      setEnvironmentAttributes(this.home.getEnvironment(), name, attributesMap);
    } else if ("compass".equals(name)) {
      setCompassAttributes(this.home.getCompass(), name, attributesMap);
    } else if ("print".equals(name)) {
      this.home.setPrint(createPrint(attributesMap));
    } else if ("level".equals(name)) {
      Level level = createLevel(name, attributesMap);
      setLevelAttributes(level, name, attributesMap);
      this.levels.put(attributesMap.get("id"), level);
      this.home.addLevel(level);
    } else if ("camera".equals(name)
        || "observerCamera".equals(name)) {
      Camera camera = createCamera(name, attributesMap);
      setCameraAttributes(camera, name, attributesMap);
      String attribute = attributesMap.get("attribute");
      if ("cameraPath".equals(attribute)) {
        // Update camera path
        List<Camera> cameraPath = new ArrayList<Camera>(this.home.getEnvironment().getVideoCameraPath());
        cameraPath.add(camera);
        this.home.getEnvironment().setVideoCameraPath(cameraPath);
      } else if ("topCamera".equals(attribute)) {
        Camera topCamera = this.home.getTopCamera();
        topCamera.setCamera(camera);
        topCamera.setTime(camera.getTime());
        topCamera.setLens(camera.getLens());
      } else if ("observerCamera".equals(attribute)) {
        ObserverCamera observerCamera = this.home.getObserverCamera();
        observerCamera.setCamera(camera);
        observerCamera.setTime(camera.getTime());
        observerCamera.setLens(camera.getLens());
        observerCamera.setFixedSize(((ObserverCamera)camera).isFixedSize());
      } else if ("storedCamera".equals(attribute)) {
        List<Camera> storedCameras = new ArrayList<Camera>(this.home.getStoredCameras());
        storedCameras.add(camera);
        this.home.setStoredCameras(storedCameras);
      }
    } else if ("pieceOfFurniture".equals(name)
        || "doorOrWindow".equals(name)
        || "light".equals(name)
        || "furnitureGroup".equals(name)) {
      HomePieceOfFurniture piece = "furnitureGroup".equals(name)
          ? createFurnitureGroup(name, attributesMap, this.groupsFurniture.pop())
          : createPieceOfFurniture(name, attributesMap);
      setPieceOfFurnitureAttributes(piece, name, attributesMap);
      if (this.homeElementName != null && this.homeElementName.equals(parent)) {
        this.home.addPieceOfFurniture(piece);
        String levelId = attributesMap.get("level");
        if (levelId != null) {
          piece.setLevel(this.levels.get(levelId));
        }
      } else if ("furnitureGroup".equals(parent)) {
        this.groupsFurniture.peek().add(piece);
      }
    } else if ("wall".equals(name)) {
      Wall wall = createWall(name, attributesMap);
      this.joinedWalls.put(attributesMap.get("id"),
          new JoinedWall(wall, attributesMap.get("wallAtStart"), attributesMap.get("wallAtEnd")));
      setWallAttributes(wall, name, attributesMap);
      this.home.addWall(wall);
      String levelId = attributesMap.get("level");
      if (levelId != null) {
        wall.setLevel(this.levels.get(levelId));
      }
    } else if ("baseboard".equals(name)) {
      Baseboard baseboard = createBaseboard(name, attributesMap);
      if ("leftSideBaseboard".equals(attributesMap.get("attribute"))) {
        this.leftSideBaseboard = baseboard;
      } else {
        this.rightSideBaseboard = baseboard;
      }
    } else if ("room".equals(name)) {
      Room room = createRoom(name, attributesMap, this.points.toArray(new float [this.points.size()][]));
      setRoomAttributes(room, name, attributesMap);
      this.home.addRoom(room);
      String levelId = attributesMap.get("level");
      if (levelId != null) {
        room.setLevel(this.levels.get(levelId));
      }
    } else if ("polyline".equals(name)) {
      Polyline polyline = createPolyline(name, attributesMap, this.points.toArray(new float [this.points.size()][]));
      setPolylineAttributes(polyline, name, attributesMap);
      this.home.addPolyline(polyline);
      String levelId = attributesMap.get("level");
      if (levelId != null) {
        polyline.setLevel(this.levels.get(levelId));
      }
    } else if ("dimensionLine".equals(name)) {
      DimensionLine dimensionLine = createDimensionLine(name, attributesMap);
      setDimensionLineAttributes(dimensionLine, name, attributesMap);
      this.home.addDimensionLine(dimensionLine);
      String levelId = attributesMap.get("level");
      if (levelId != null) {
        dimensionLine.setLevel(this.levels.get(levelId));
      }
    } else if ("label".equals(name)) {
      Label label = createLabel(name, attributesMap, this.labelText);
      setLabelAttributes(label, name, attributesMap);
      this.home.addLabel(label);
      String levelId = attributesMap.get("level");
      if (levelId != null) {
        label.setLevel(this.levels.get(levelId));
      }
    } else if ("text".equals(name)) {
      this.labelText = getCharacters();
    } else if ("textStyle".equals(name)) {
      String attribute = attributesMap.get("attribute");
      this.textStyles.peek().put(attribute != null ? attribute : UNIQUE_ATTRIBUTE,
          createTextStyle(name, attributesMap));
    } else if ("texture".equals(name)) {
      if ("material".equals(parent)) {
        this.materialTexture = createTexture(name, attributesMap);
      } else {
        String attribute = attributesMap.get("attribute");
        this.textures.put(attribute != null ? attribute : UNIQUE_ATTRIBUTE,
            createTexture(name, attributesMap));
      }
    } else if ("material".equals(name)) {
      this.materials.add(createMaterial(name, attributesMap));
    } else if ("transformation".equals(name)) {
      String matrixAttribute = attributesMap.get("matrix");
      if (matrixAttribute == null) {
        throw new SAXException("Missing attribute matrix");
      } else {
        String [] values = matrixAttribute.split(" ", 12);
        if (values.length < 12) {
          throw new SAXException("Missing values for attribute matrix");
        }
        try {
          float [][] matrix = new float [][] {
              {Float.parseFloat(values [0]),
               Float.parseFloat(values [1]),
               Float.parseFloat(values [2]),
               Float.parseFloat(values [3])},
              {Float.parseFloat(values [4]),
               Float.parseFloat(values [5]),
               Float.parseFloat(values [6]),
               Float.parseFloat(values [7])},
              {Float.parseFloat(values [8]),
               Float.parseFloat(values [9]),
               Float.parseFloat(values [10]),
               Float.parseFloat(values [11])}};
          Transformation transformation = new Transformation(
              attributesMap.get("name"),
              matrix);
          this.transformations.add((Transformation)resolveObject(transformation, name, attributesMap));
        } catch (NumberFormatException ex) {
          throw new SAXException("Invalid value for attribute matrix", ex);
        }
      }
    } else if ("point".equals(name)) {
      this.points.add(new float [] {
          parseFloat(attributesMap, "x"),
          parseFloat(attributesMap, "y")});
    } else if ("sash".equals(name)) {
      Sash sash = new Sash(
          parseFloat(attributesMap, "xAxis"),
          parseFloat(attributesMap, "yAxis"),
          parseFloat(attributesMap, "width"),
          parseFloat(attributesMap, "startAngle"),
          parseFloat(attributesMap, "endAngle"));
      this.sashes.add((Sash)resolveObject(sash, name, attributesMap));
    } else if ("lightSource".equals(name)) {
      LightSource lightSource = new LightSource(
          parseFloat(attributesMap, "x"),
          parseFloat(attributesMap, "y"),
          parseFloat(attributesMap, "z"),
          parseOptionalColor(attributesMap, "color"),
          parseOptionalFloat(attributesMap, "diameter"));
      this.lightSources.add((LightSource)resolveObject(lightSource, name, attributesMap));
    } else if ("backgroundImage".equals(name)) {
      BackgroundImage backgroundImage = new BackgroundImage(
          parseContent(attributesMap.get("image"), null, false),
          parseFloat(attributesMap, "scaleDistance"),
          parseFloat(attributesMap, "scaleDistanceXStart"),
          parseFloat(attributesMap, "scaleDistanceYStart"),
          parseFloat(attributesMap, "scaleDistanceXEnd"),
          parseFloat(attributesMap, "scaleDistanceYEnd"),
          attributesMap.get("xOrigin") != null
              ? parseFloat(attributesMap, "xOrigin")
              : 0,
          attributesMap.get("yOrigin") != null
              ? parseFloat(attributesMap, "yOrigin")
              : 0,
          !"false".equals(attributesMap.get("visible")));
      backgroundImage = (BackgroundImage)resolveObject(backgroundImage, name, attributesMap);
      if (this.homeElementName != null && this.homeElementName.equals(parent)) {
        this.homeBackgroundImage = backgroundImage;
      } else {
        this.backgroundImage = backgroundImage;
      }
    } else if ("property".equals(name)) {
      if (this.homeElementName != null) {
        this.properties.peek().put(attributesMap.get("name"), attributesMap.get("value"));
      }
    }

    if (!"property".equals(name)
        && !"furnitureVisibleProperty".equals(name)
        && !"textStyle".equals(name)) {
      // Clear properties and text styles that may be cited in child elements
      this.properties.pop();
      this.textStyles.pop();
    }
  }

  /**
   * Returns the trimmed string of last element value.
   */
  private String getCharacters() {
    return this.buffer.toString();
  }

  @Override
  public void endDocument() throws SAXException {
    // Rebind wall starts and ends
    for (JoinedWall joinedWall : this.joinedWalls.values()) {
      Wall wall = joinedWall.getWall();
      if (joinedWall.getWallAtStartId() != null
          && !joinedWall.getWallAtStartId().equals(wall.getId())) { // Check wall doesn't point to itself (bug in version 6.4)
        JoinedWall joinedWallAtStart = this.joinedWalls.get(joinedWall.getWallAtStartId());
        if (joinedWallAtStart != null) {
          wall.setWallAtStart(joinedWallAtStart.getWall());
        }
      }
      if (joinedWall.getWallAtEndId() != null
          && !joinedWall.getWallAtEndId().equals(wall.getId())) { // Check wall doesn't point to itself (bug in version 6.4)
        JoinedWall joinedWallAtEnd = this.joinedWalls.get(joinedWall.getWallAtEndId());
        if (joinedWallAtEnd != null) {
          wall.setWallAtEnd(joinedWallAtEnd.getWall());
        }
      }
    }
  }

  /**
   * Returns the object that will be stored in a home. This method is called for each home object created by this handler
   * after its instantiation and returns <code>elementObject</code>. It might be overridden to substitute an object
   * parsed from an XML element and its attributes for an other one of a different subclass if needed.
   */
  protected Object resolveObject(Object elementObject, String elementName, Map<String, String> attributes) {
    return elementObject;
  }

  /**
   * Returns a new {@link Home} instance initialized from the given <code>attributes</code>.
   * @return a home instance with its version set.
   */
  private Home createHome(String elementName,
                          Map<String, String> attributes) throws SAXException {
    Home home;
    if (attributes.get("wallHeight") != null) {
      home = new Home(parseFloat(attributes, "wallHeight"));
    } else {
      home = new Home();
    }
    String version = attributes.get("version");
    if (version != null) {
      try {
        home.setVersion(Integer.parseInt(version));
      } catch (NumberFormatException ex) {
        throw new SAXException("Invalid value for integer attribute version", ex);
      }
    }
    return (Home)resolveObject(home, elementName, attributes);
  }

  /**
   * Sets the attributes of the given <code>home</code>.
   * If needed, this method should be called from {@link #endElement}.
   */
  protected void setHomeAttributes(Home home,
                                   String elementName,
                                   Map<String, String> attributes) throws SAXException {
    for (Map.Entry<String, String> property : this.properties.peek().entrySet()) {
      home.setProperty(property.getKey(), property.getValue());
    }
    if (this.furnitureVisibleProperties.size() > 0) {
      this.home.setFurnitureVisibleProperties(this.furnitureVisibleProperties);
    }
    this.home.setBackgroundImage(this.homeBackgroundImage);
    home.setName(attributes.get("name"));
    String selectedLevelId = attributes.get("selectedLevel");
    if (selectedLevelId != null) {
      this.home.setSelectedLevel(this.levels.get(selectedLevelId));
    }
    if ("observerCamera".equals(attributes.get("camera"))) {
      this.home.setCamera(this.home.getObserverCamera());
    }
    home.setBasePlanLocked("true".equals(attributes.get("basePlanLocked")));
    String furnitureSortedProperty = attributes.get("furnitureSortedProperty");
    if (furnitureSortedProperty != null) {
      try {
        home.setFurnitureSortedProperty(HomePieceOfFurniture.SortableProperty.valueOf(furnitureSortedProperty));
      } catch (IllegalArgumentException ex) {
        // Ignore malformed enum constant
      }
    }
    home.setFurnitureDescendingSorted("true".equals(attributes.get("furnitureDescendingSorted")));
  }

  /**
   * Sets the attributes of the given <code>environment</code>.
   * If needed, this method should be called from {@link #endElement}.
   */
  private void setEnvironmentAttributes(HomeEnvironment environment,
                                        String elementName,
                                        Map<String, String> attributes) throws SAXException {
    setProperties(environment);
    Integer groundColor = parseOptionalColor(attributes, "groundColor");
    if (groundColor != null) {
      environment.setGroundColor(groundColor);
    }
    environment.setGroundTexture(this.textures.get("groundTexture"));
    environment.setBackgroundImageVisibleOnGround3D("true".equals(attributes.get("backgroundImageVisibleOnGround3D")));
    Integer skyColor = parseOptionalColor(attributes, "skyColor");
    if (skyColor != null) {
      environment.setSkyColor(skyColor);
    }
    environment.setSkyTexture(this.textures.get("skyTexture"));
    Integer lightColor = parseOptionalColor(attributes, "lightColor");
    if (lightColor != null) {
      environment.setLightColor(lightColor);
    }
    Float wallsAlpha = parseOptionalFloat(attributes, "wallsAlpha");
    if (wallsAlpha != null) {
      environment.setWallsAlpha(wallsAlpha);
    }
    environment.setAllLevelsVisible("true".equals(attributes.get("allLevelsVisible")));
    environment.setObserverCameraElevationAdjusted(!"false".equals(attributes.get("observerCameraElevationAdjusted")));
    Integer ceillingLightColor = parseOptionalColor(attributes, "ceillingLightColor");
    if (ceillingLightColor != null) {
      environment.setCeillingLightColor(ceillingLightColor);
    }
    String drawingMode = attributes.get("drawingMode");
    if (drawingMode != null) {
      try {
        environment.setDrawingMode(HomeEnvironment.DrawingMode.valueOf(drawingMode));
      } catch (IllegalArgumentException ex) {
        // Ignore malformed enum constant
      }
    }
    Float subpartSizeUnderLight = parseOptionalFloat(attributes, "subpartSizeUnderLight");
    if (subpartSizeUnderLight != null) {
      environment.setSubpartSizeUnderLight(subpartSizeUnderLight);
    }
    Integer photoWidth = parseOptionalInteger(attributes, "photoWidth");
    if (photoWidth != null) {
      environment.setPhotoWidth(photoWidth);
    }
    Integer photoHeight = parseOptionalInteger(attributes, "photoHeight");
    if (photoHeight != null) {
      environment.setPhotoHeight(photoHeight);
    }
    String photoAspectRatio = attributes.get("photoAspectRatio");
    if (photoAspectRatio != null) {
      try {
        environment.setPhotoAspectRatio(AspectRatio.valueOf(photoAspectRatio));
      } catch (IllegalArgumentException ex) {
        // Ignore malformed enum constant
      }
    }
    Integer photoQuality = parseOptionalInteger(attributes, "photoQuality");
    if (photoQuality != null) {
      environment.setPhotoQuality(photoQuality);
    }
    Integer videoWidth = parseOptionalInteger(attributes, "videoWidth");
    if (videoWidth != null) {
      environment.setVideoWidth(videoWidth);
    }
    String videoAspectRatio = attributes.get("videoAspectRatio");
    if (videoAspectRatio != null) {
      try {
        environment.setVideoAspectRatio(AspectRatio.valueOf(videoAspectRatio));
      } catch (IllegalArgumentException ex) {
        // Ignore malformed enum constant
      }
    }
    Integer videoQuality = parseOptionalInteger(attributes, "videoQuality");
    if (videoQuality != null) {
      environment.setVideoQuality(videoQuality);
    }
    Float videoSpeed = parseOptionalFloat(attributes, "videoSpeed");
    if (videoSpeed != null) {
      environment.setVideoSpeed(videoSpeed);
    }
    Integer videoFrameRate = parseOptionalInteger(attributes, "videoFrameRate");
    if (videoFrameRate != null) {
      environment.setVideoFrameRate(videoFrameRate);
    }
  }

  /**
   * Returns a new {@link HomePrint} instance initialized from the given <code>attributes</code>.
   */
  protected HomePrint createPrint(Map<String, String> attributes) throws SAXException {
    HomePrint.PaperOrientation paperOrientation = HomePrint.PaperOrientation.PORTRAIT;
    try {
      if (attributes.get("paperOrientation") == null) {
        throw new SAXException("Missing paperOrientation attribute");
      }
      paperOrientation = HomePrint.PaperOrientation.valueOf(attributes.get("paperOrientation"));
    } catch (IllegalArgumentException ex) {
      // Ignore malformed enum constant
    }
    HomePrint homePrint = new HomePrint(paperOrientation,
        parseFloat(attributes, "paperWidth"),
        parseFloat(attributes, "paperHeight"),
        parseFloat(attributes, "paperTopMargin"),
        parseFloat(attributes, "paperLeftMargin"),
        parseFloat(attributes, "paperBottomMargin"),
        parseFloat(attributes, "paperRightMargin"),
        !"false".equals(attributes.get("furniturePrinted")),
        !"false".equals(attributes.get("planPrinted")),
        !"false".equals(attributes.get("view3DPrinted")),
        parseOptionalFloat(attributes, "planScale"),
        attributes.get("headerFormat"),
        attributes.get("footerFormat"));
    return (HomePrint)resolveObject(homePrint, "print", attributes);
  }

  /**
   * Sets the attributes of the given <code>compass</code>.
   * If needed, this method should be called from {@link #endElement}.
   */
  protected void setCompassAttributes(Compass compass,
                                      String elementName,
                                      Map<String, String> attributes) throws SAXException {
    setProperties(compass);
    compass.setX(parseOptionalFloat(attributes, "x"));
    compass.setY(parseOptionalFloat(attributes, "y"));
    compass.setDiameter(parseOptionalFloat(attributes, "diameter"));
    Float northDirection = parseOptionalFloat(attributes, "northDirection");
    if (northDirection != null) {
      compass.setNorthDirection(northDirection);
    }
    Float longitude = parseOptionalFloat(attributes, "longitude");
    if (longitude != null) {
      compass.setLongitude(longitude);
    }
    Float latitude = parseOptionalFloat(attributes, "latitude");
    if (latitude != null) {
      compass.setLatitude(latitude);
    }
    String timeZone = attributes.get("timeZone");
    if (timeZone != null) {
      compass.setTimeZone(timeZone);
    }
    compass.setVisible(!"false".equals(attributes.get("visible")));
  }

  /**
   * Returns a new {@link Camera} instance initialized from the given <code>attributes</code>.
   */
  private Camera createCamera(String elementName, Map<String, String> attributes) throws SAXException {
    String id = attributes.get("id");
    float x = parseFloat(attributes, "x");
    float y = parseFloat(attributes, "y");
    float z = parseFloat(attributes, "z");
    float yaw = parseFloat(attributes, "yaw");
    float pitch = parseFloat(attributes, "pitch");
    float fieldOfView = parseFloat(attributes, "fieldOfView");
    Camera camera;
    if ("observerCamera".equals(elementName)) {
      camera = id != null
          ? new ObserverCamera(id, x, y, z, yaw, pitch, fieldOfView)
          : new ObserverCamera(x, y, z, yaw, pitch, fieldOfView);
    } else {
      camera = id != null
          ? new Camera(id, x, y, z, yaw, pitch, fieldOfView)
          : new Camera(x, y, z, yaw, pitch, fieldOfView);
    }
    return (Camera)resolveObject(camera, elementName, attributes);
  }

  /**
   * Sets the attributes of the given <code>camera</code>.
   * If needed, this method should be called from {@link #endElement}.
   */
  protected void setCameraAttributes(Camera camera,
                                     String elementName,
                                     Map<String, String> attributes) throws SAXException {
    setProperties(camera);
    if (camera instanceof ObserverCamera) {
      ((ObserverCamera)camera).setFixedSize("true".equals(attributes.get("fixedSize")));
    }
    String lens = attributes.get("lens");
    if (lens != null) {
      try {
        camera.setLens(Camera.Lens.valueOf(lens));
      } catch (IllegalArgumentException ex) {
        // Ignore malformed enum constant
      }
    }
    String time = attributes.get("time");
    if (time != null) {
      try {
        camera.setTime(Long.parseLong(time));
      } catch (NumberFormatException ex) {
        throw new SAXException("Invalid value for long attribute time", ex);
      }
    }

    camera.setName(attributes.get("name"));
  }

  /**
   * Returns a new {@link Level} instance initialized from the given <code>attributes</code>.
   */
  private Level createLevel(String elementName, Map<String, String> attributes) throws SAXException {
    String id = attributes.get("id");
    String name = attributes.get("name");
    float elevation = parseFloat(attributes, "elevation");
    float floorThickness = parseFloat(attributes, "floorThickness");
    float height = parseFloat(attributes, "height");
    Level level = id != null
        ? new Level(id, name, elevation, floorThickness, height)
        : new Level(name, elevation, floorThickness, height);
    return (Level)resolveObject(level, elementName, attributes);
  }

  /**
   * Sets the attributes of the given <code>level</code>.
   * If needed, this method should be called from {@link #endElement}.
   */
  protected void setLevelAttributes(Level level,
                                    String elementName,
                                    Map<String, String> attributes) throws SAXException {
    setProperties(level);
    level.setBackgroundImage(this.backgroundImage);
    Integer elevationIndex = parseOptionalInteger(attributes, "elevationIndex");
    if (elevationIndex != null) {
      level.setElevationIndex(elevationIndex);
    }
    level.setVisible(!"false".equals(attributes.get("visible")));
    level.setViewable(!"false".equals(attributes.get("viewable")));
  }

  /**
   * Returns a new {@link HomePieceOfFurniture} instance initialized from the given <code>attributes</code>.
   */
  private HomePieceOfFurniture createPieceOfFurniture(String elementName, Map<String, String> attributes) throws SAXException {
    String id = attributes.get("id");
    String catalogId = attributes.get("catalogId");
    String [] tags = attributes.get("tags") != null
        ? attributes.get("tags").split(" ")
        : null;
    float elevation = attributes.get("elevation") != null
        ? parseFloat(attributes, "elevation")
        : 0;
    float dropOnTopElevation = attributes.get("dropOnTopElevation") != null
        ? parseFloat(attributes, "dropOnTopElevation")
        : 1;
    float [][] modelRotation = null;
    if (attributes.get("modelRotation") != null) {
      String [] values = attributes.get("modelRotation").split(" ", 9);
      if (values.length < 9) {
        throw new SAXException("Missing values for attribute modelRotation");
      }
      try {
        modelRotation = new float [][] {
            {Float.parseFloat(values [0]),
             Float.parseFloat(values [1]),
             Float.parseFloat(values [2])},
            {Float.parseFloat(values [3]),
             Float.parseFloat(values [4]),
             Float.parseFloat(values [5])},
            {Float.parseFloat(values [6]),
             Float.parseFloat(values [7]),
             Float.parseFloat(values [8])}};
      } catch (NumberFormatException ex) {
        throw new SAXException("Invalid value for attribute modelRotation", ex);
      }
    }
    String name = attributes.get("name");
    String description = attributes.get("description");
    String information = attributes.get("information");
    Long creationDate = parseOptionalLong(attributes, "creationDate");
    Float grade = parseOptionalFloat(attributes, "grade");
    Content icon = parseContent(attributes.get("icon"), catalogId, false);
    Content planIcon = parseContent(attributes.get("planIcon"), catalogId, false);
    Content model = parseContent(attributes.get("model"), catalogId, false);
    float width = parseFloat(attributes, "width");
    float depth = parseFloat(attributes, "depth");
    float height = parseFloat(attributes, "height");
    boolean movable = !"false".equals(attributes.get("movable"));
    boolean backFaceShown = "true".equals(attributes.get("backFaceShown"));
    Long modelSize = parseOptionalLong(attributes, "modelSize");
    String creator = attributes.get("creator");
    boolean resizable = !"false".equals(attributes.get("resizable"));
    boolean deformable = !"false".equals(attributes.get("deformable"));
    boolean texturable = !"false".equals(attributes.get("texturable"));
    BigDecimal price = parseOptionalDecimal(attributes, "price");
    BigDecimal valueAddedTaxPercentage = parseOptionalDecimal(attributes, "valueAddedTaxPercentage");
    String currency = attributes.get("currency");
    HomePieceOfFurniture piece;
    if ("doorOrWindow".equals(elementName)
        // Replace old HomePieceOfFurniture instances with doorOrWindow attribute set to true by HomeDoorOrWindow instances
        || "true".equals(attributes.get("doorOrWindow"))) {
      float wallThickness = attributes.get("wallThickness") != null
          ? parseFloat(attributes, "wallThickness")
          : 1;
      float wallDistance = attributes.get("wallDistance") != null
          ? parseFloat(attributes, "wallDistance")
          : 0;
      String cutOutShape = attributes.get("cutOutShape");
      if (cutOutShape == null
          && !"doorOrWindow".equals(elementName)) {
        // Set default cut out shape set on old HomePieceOfFurniture instances with doorOrWindow attribute set to true
        cutOutShape = PieceOfFurniture.DEFAULT_CUT_OUT_SHAPE;
      }
      boolean wallCutOutOnBothSides = "true".equals(attributes.get("wallCutOutOnBothSides"));
      boolean widthDepthDeformable = !"false".equals(attributes.get("widthDepthDeformable"));
      CatalogDoorOrWindow catalogDoorOrWindow = new CatalogDoorOrWindow(catalogId, name, description, information, tags,
          creationDate, grade, icon, planIcon, model, width, depth, height, elevation, dropOnTopElevation, movable,
          cutOutShape, wallThickness, wallDistance, wallCutOutOnBothSides, widthDepthDeformable,
          this.sashes.toArray(new Sash [this.sashes.size()]),
          modelRotation, backFaceShown, modelSize, creator,
          resizable, deformable, texturable, price, valueAddedTaxPercentage, currency);
      piece = id != null
          ? new HomeDoorOrWindow(id, catalogDoorOrWindow)
          : new HomeDoorOrWindow(catalogDoorOrWindow);
    } else {
      String staircaseCutOutShape = attributes.get("staircaseCutOutShape");
      boolean horizontallyRotatable = !"false".equals(attributes.get("horizontallyRotatable"));
      if ("light".equals(elementName)) {
        CatalogLight catalogLight = new CatalogLight(catalogId, name, description, information, tags, creationDate, grade,
            icon, planIcon, model, width, depth, height, elevation, dropOnTopElevation, movable,
            this.lightSources.toArray(new LightSource [this.lightSources.size()]),
            staircaseCutOutShape, modelRotation, backFaceShown, modelSize, creator, resizable, deformable, texturable,
            horizontallyRotatable, price, valueAddedTaxPercentage, currency);
        piece = id != null
            ? new HomeLight(id, catalogLight)
            : new HomeLight(catalogLight);
      } else {
        CatalogPieceOfFurniture catalogPiece = new CatalogPieceOfFurniture(catalogId, name, description, information, tags,
            creationDate, grade, icon, planIcon, model, width, depth, height, elevation, dropOnTopElevation, movable,
            staircaseCutOutShape, modelRotation, backFaceShown, modelSize, creator, resizable, deformable, texturable,
            horizontallyRotatable, price, valueAddedTaxPercentage, currency);
        piece = id != null
            ? new HomePieceOfFurniture(id, catalogPiece)
            : new HomePieceOfFurniture(catalogPiece);
      }
    }
    return (HomePieceOfFurniture)resolveObject(piece, elementName, attributes);
  }

  /**
   * Returns a new {@link HomeFurnitureGroup} instance initialized from the given <code>attributes</code>.
   */
  private HomeFurnitureGroup createFurnitureGroup(String elementName, Map<String, String> attributes,
                                                  List<HomePieceOfFurniture> furniture) throws SAXException {
    String id = attributes.get("id");
    float angle = attributes.get("angle") != null ? parseFloat(attributes, "angle") : 0;
    boolean modelMirrored = "true".equals(attributes.get("modelMirrored"));
    String name = attributes.get("name");
    HomeFurnitureGroup furnitureGroup = id != null
        ? new HomeFurnitureGroup(id, furniture, angle, modelMirrored, name)
        : new HomeFurnitureGroup(furniture, angle, modelMirrored, name);
    return (HomeFurnitureGroup)resolveObject(furnitureGroup, elementName, attributes);
  }

  /**
   * Sets the attributes of the given <code>piece</code>.
   * If needed, this method should be called from {@link #endElement}.
   */
  protected void setPieceOfFurnitureAttributes(HomePieceOfFurniture piece,
                                               String elementName,
                                               Map<String, String> attributes) throws SAXException {
    setProperties(piece);
    piece.setNameStyle(this.textStyles.peek().get("nameStyle"));
    piece.setNameVisible("true".equals(attributes.get("nameVisible")));
    Float nameAngle = parseOptionalFloat(attributes, "nameAngle");
    if (nameAngle != null) {
      piece.setNameAngle(nameAngle);
    }
    Float nameXOffset = parseOptionalFloat(attributes, "nameXOffset");
    if (nameXOffset != null) {
      piece.setNameXOffset(nameXOffset);
    }
    Float nameYOffset = parseOptionalFloat(attributes, "nameYOffset");
    if (nameYOffset != null) {
      piece.setNameYOffset(nameYOffset);
    }
    piece.setVisible(!"false".equals(attributes.get("visible")));

    if (!(piece instanceof HomeFurnitureGroup)) {
      // Location is computed for HomeFurnitureGroup instances during their creation
      Float x = parseOptionalFloat(attributes, "x");
      if (x != null) {
        piece.setX(x);
      }
      Float y = parseOptionalFloat(attributes, "y");
      if (y != null) {
        piece.setY(y);
      }
      // Angle is already set for HomeFurnitureGroup instances during creation
      Float angle = parseOptionalFloat(attributes, "angle");
      if (angle != null) {
        piece.setAngle(angle);
      }
      if (piece.isHorizontallyRotatable()) {
        Float pitch = parseOptionalFloat(attributes, "pitch");
        if (pitch != null) {
          piece.setPitch(pitch);
        }
        Float roll = parseOptionalFloat(attributes, "roll");
        if (roll != null) {
          piece.setRoll(roll);
        }
      }
      Float widthInPlan = parseOptionalFloat(attributes, "widthInPlan");
      if (widthInPlan != null) {
        piece.setWidthInPlan(widthInPlan);
      }
      Float depthInPlan = parseOptionalFloat(attributes, "depthInPlan");
      if (depthInPlan != null) {
        piece.setDepthInPlan(depthInPlan);
      }
      Float heightInPlan = parseOptionalFloat(attributes, "heightInPlan");
      if (heightInPlan != null) {
        piece.setHeightInPlan(heightInPlan);
      }
      if (this.home.getVersion() < 5500 || "false".equals(attributes.get("modelCenteredAtOrigin"))) {
        // Set value to false only if model rotation matrix is defined
        piece.setModelCenteredAtOrigin(attributes.get("modelRotation") == null);
      }
      if (piece.isResizable()) {
        // Attribute already set for HomeFurnitureGroup instances during creation
        piece.setModelMirrored("true".equals(attributes.get("modelMirrored")));
      }
      if (piece.isTexturable()) {
        // Attributes ignored in HomeFurnitureGroup instances
        if (this.materials.size() > 0) {
          piece.setModelMaterials(this.materials.toArray(new HomeMaterial [this.materials.size()]));
        }
        Integer color = parseOptionalColor(attributes, "color");
        if (color != null) {
          piece.setColor(color);
        }
        HomeTexture texture = this.textures.get(UNIQUE_ATTRIBUTE);
        if (texture != null) {
          piece.setTexture(texture);
        }
        Float shininess = parseOptionalFloat(attributes, "shininess");
        if (shininess != null) {
          piece.setShininess(shininess);
        }
      }
      if (piece.isDeformable()) {
        if (this.transformations.size() > 0) {
          piece.setModelTransformations(this.transformations.toArray(new Transformation [this.transformations.size()]));
        }
      }

      if (piece instanceof HomeLight
          && attributes.get("power") != null) {
        ((HomeLight)piece).setPower(parseFloat(attributes, "power"));
      } else if (piece instanceof HomeDoorOrWindow
                 && "doorOrWindow".equals(elementName)) {
        HomeDoorOrWindow doorOrWindow = (HomeDoorOrWindow)piece;
        doorOrWindow.setBoundToWall(!"false".equals(attributes.get("boundToWall")));
        Float wallWidth = parseOptionalFloat(attributes, "wallWidth");
        if (wallWidth != null) {
          doorOrWindow.setWallWidth(wallWidth);
        }
        Float wallLeft = parseOptionalFloat(attributes, "wallLeft");
        if (wallLeft != null) {
          doorOrWindow.setWallLeft(wallLeft);
        }
        Float wallHeight = parseOptionalFloat(attributes, "wallHeight");
        if (wallHeight != null) {
          doorOrWindow.setWallHeight(wallHeight);
        }
        Float wallTop = parseOptionalFloat(attributes, "wallTop");
        if (wallTop != null) {
          doorOrWindow.setWallTop(wallTop);
        }
      }
    } else {
      // Set group attributes that may exist but can't be set at instantiation time
      piece.setCatalogId(attributes.get("catalogId"));
      piece.setDescription(attributes.get("description"));
      piece.setInformation(attributes.get("information"));
      piece.setCreator(attributes.get("creator"));
    }
  }

  /**
   * Returns a new {@link Wall} instance initialized from the given <code>attributes</code>.
   */
  private Wall createWall(String elementName, Map<String, String> attributes) throws SAXException {
    String id = attributes.get("id");
    float xStart = parseFloat(attributes, "xStart");
    float yStart = parseFloat(attributes, "yStart");
    float xEnd = parseFloat(attributes, "xEnd");
    float yEnd = parseFloat(attributes, "yEnd");
    float thickness = parseFloat(attributes, "thickness");
    Wall wall = id != null
        ? new Wall(id, xStart, yStart, xEnd, yEnd, thickness, 0)
        : new Wall(xStart, yStart, xEnd, yEnd, thickness, 0);
    return (Wall)resolveObject(wall, elementName, attributes);
  }

  /**
   * Sets the attributes of the given <code>wall</code>.
   * If needed, this method should be called from {@link #endElement}.
   */
  protected void setWallAttributes(Wall wall,
                                   String elementName,
                                   Map<String, String> attributes) throws SAXException {
    setProperties(wall);
    wall.setLeftSideBaseboard(this.leftSideBaseboard);
    wall.setRightSideBaseboard(this.rightSideBaseboard);
    wall.setHeight(parseOptionalFloat(attributes, "height"));
    wall.setHeightAtEnd(parseOptionalFloat(attributes, "heightAtEnd"));
    wall.setArcExtent(parseOptionalFloat(attributes, "arcExtent"));
    wall.setTopColor(parseOptionalColor(attributes, "topColor"));
    wall.setLeftSideColor(parseOptionalColor(attributes, "leftSideColor"));
    wall.setLeftSideTexture(this.textures.get("leftSideTexture"));
    Float leftSideShininess = parseOptionalFloat(attributes, "leftSideShininess");
    if (leftSideShininess != null) {
      wall.setLeftSideShininess(leftSideShininess);
    }
    wall.setRightSideColor(parseOptionalColor(attributes, "rightSideColor"));
    wall.setRightSideTexture(this.textures.get("rightSideTexture"));
    Float rightSideShininess = parseOptionalFloat(attributes, "rightSideShininess");
    if (rightSideShininess != null) {
      wall.setRightSideShininess(rightSideShininess);
    }
    String pattern = attributes.get("pattern");
    if (pattern != null) {
      try {
        wall.setPattern(this.preferences.getPatternsCatalog().getPattern(pattern));
      } catch (IllegalArgumentException ex) {
        // Ignore pattern
      }
    }
  }

  /**
   * Returns a new {@link Room} instance initialized from the given <code>attributes</code>.
   */
  private Room createRoom(String elementName, Map<String, String> attributes,
                          float[][] points) {
    String id = attributes.get("id");
    Room room = id != null
        ? new Room(id, points)
        : new Room(points);
    return (Room)resolveObject(room, elementName, attributes);
  }

  /**
   * Sets the attributes of the given <code>room</code>.
   * If needed, this method should be called from {@link #endElement}.
   */
  protected void setRoomAttributes(Room room,
                                   String elementName,
                                   Map<String, String> attributes) throws SAXException {
    setProperties(room);
    room.setNameStyle(this.textStyles.peek().get("nameStyle"));
    room.setAreaStyle(this.textStyles.peek().get("areaStyle"));
    room.setName(attributes.get("name"));
    Float nameAngle = parseOptionalFloat(attributes, "nameAngle");
    if (nameAngle != null) {
      room.setNameAngle(nameAngle);
    }
    Float nameXOffset = parseOptionalFloat(attributes, "nameXOffset");
    if (nameXOffset != null) {
      room.setNameXOffset(nameXOffset);
    }
    Float nameYOffset = parseOptionalFloat(attributes, "nameYOffset");
    if (nameYOffset != null) {
      room.setNameYOffset(nameYOffset);
    }
    room.setAreaVisible("true".equals(attributes.get("areaVisible")));
    Float areaAngle = parseOptionalFloat(attributes, "areaAngle");
    if (areaAngle != null) {
      room.setAreaAngle(areaAngle);
    }
    Float areaXOffset = parseOptionalFloat(attributes, "areaXOffset");
    if (areaXOffset != null) {
      room.setAreaXOffset(areaXOffset);
    }
    Float areaYOffset = parseOptionalFloat(attributes, "areaYOffset");
    if (areaYOffset != null) {
      room.setAreaYOffset(areaYOffset);
    }
    room.setFloorVisible(!"false".equals(attributes.get("floorVisible")));
    room.setFloorColor(parseOptionalColor(attributes, "floorColor"));
    room.setFloorTexture(this.textures.get("floorTexture"));
    Float floorShininess = parseOptionalFloat(attributes, "floorShininess");
    if (floorShininess != null) {
      room.setFloorShininess(floorShininess);
    }
    room.setCeilingVisible(!"false".equals(attributes.get("ceilingVisible")));
    room.setCeilingColor(parseOptionalColor(attributes, "ceilingColor"));
    room.setCeilingTexture(this.textures.get("ceilingTexture"));
    Float ceilingShininess = parseOptionalFloat(attributes, "ceilingShininess");
    if (ceilingShininess != null) {
      room.setCeilingShininess(ceilingShininess);
    }
  }

  /**
   * Returns a new {@link Polyline} instance initialized from the given <code>attributes</code>.
   */
  private Polyline createPolyline(String elementName,  Map<String, String> attributes,
                                  float[][] points) {
    String id = attributes.get("id");
    Polyline polyline = id != null
        ? new Polyline(id, points)
        : new Polyline(points);
    return (Polyline)resolveObject(polyline, elementName, attributes);
  }

  /**
   * Sets the attributes of the given <code>polyline</code>.
   * If needed, this method should be called from {@link #endElement}.
   */
  protected void setPolylineAttributes(Polyline polyline,
                                       String elementName,
                                       Map<String, String> attributes) throws SAXException {
    setProperties(polyline);
    Float thickness = parseOptionalFloat(attributes, "thickness");
    if (thickness != null) {
      polyline.setThickness(thickness);
    }
    String capStyle = attributes.get("capStyle");
    if (capStyle != null) {
      try {
        polyline.setCapStyle(Polyline.CapStyle.valueOf(capStyle));
      } catch (IllegalArgumentException ex) {
        // Ignore malformed enum constant
      }
    }
    String joinStyle = attributes.get("joinStyle");
    if (joinStyle != null) {
      try {
        polyline.setJoinStyle(Polyline.JoinStyle.valueOf(joinStyle));
      } catch (IllegalArgumentException ex) {
        // Ignore malformed enum constant
      }
    }
    String dashStyle = attributes.get("dashStyle");
    if (dashStyle != null) {
      try {
        polyline.setDashStyle(Polyline.DashStyle.valueOf(dashStyle));
      } catch (IllegalArgumentException ex) {
        // Ignore malformed enum constant
      }
    }
    String dashPattern = attributes.get("dashPattern");
    if (dashPattern != null) {
      try {
        String [] values = dashPattern.split(" ");
        float [] pattern = new float [values.length];
        for (int i = 0; i < values.length; i++) {
          pattern [i] = Float.parseFloat(values [i]);
        }
        polyline.setDashPattern(pattern);
      } catch (NumberFormatException ex) {
        throw new SAXException("Invalid value for dash pattern", ex);
      }
    }
    Float dashOffset = parseOptionalFloat(attributes, "dashOffset");
    if (dashOffset != null) {
      polyline.setDashOffset(dashOffset);
    }
    String startArrowStyle = attributes.get("startArrowStyle");
    if (startArrowStyle != null) {
      try {
        polyline.setStartArrowStyle(Polyline.ArrowStyle.valueOf(startArrowStyle));
      } catch (IllegalArgumentException ex) {
        // Ignore malformed enum constant
      }
    }
    String endArrowStyle = attributes.get("endArrowStyle");
    if (endArrowStyle != null) {
      try {
        polyline.setEndArrowStyle(Polyline.ArrowStyle.valueOf(endArrowStyle));
      } catch (IllegalArgumentException ex) {
        // Ignore malformed enum constant
      }
    }
    Float elevation = parseOptionalFloat(attributes, "elevation");
    if (elevation != null) {
      polyline.setVisibleIn3D(true);
      polyline.setElevation(elevation);
    }
    Integer color = parseOptionalColor(attributes, "color");
    if (color != null) {
      polyline.setColor(color);
    }
    polyline.setClosedPath("true".equals(attributes.get("closedPath")));
  }

  /**
   * Returns a new {@link DimensionLine} instance initialized from the given <code>attributes</code>.
   */
  private DimensionLine createDimensionLine(String elementName,
                                            Map<String, String> attributes) throws SAXException {
    String id = attributes.get("id");
    float xStart = parseFloat(attributes, "xStart");
    float yStart = parseFloat(attributes, "yStart");
    float xEnd = parseFloat(attributes, "xEnd");
    float yEnd = parseFloat(attributes, "yEnd");
    float offset = parseFloat(attributes, "offset");
    DimensionLine dimensionLine = id != null
        ? new DimensionLine(id, xStart, yStart, xEnd, yEnd, offset)
        : new DimensionLine(xStart, yStart, xEnd, yEnd, offset);
    return (DimensionLine)resolveObject(dimensionLine, elementName, attributes);
  }

  /**
   * Sets the attributes of the given dimension line.
   * If needed, this method should be called from {@link #endElement}.
   */
  protected void setDimensionLineAttributes(DimensionLine dimensionLine,
                                            String elementName,
                                            Map<String, String> attributes) throws SAXException {
    setProperties(dimensionLine);
    dimensionLine.setLengthStyle(this.textStyles.peek().get("lengthStyle"));
  }

  /**
   * Returns a new {@link Label} instance initialized from the given <code>attributes</code>.
   */
  private Label createLabel(String elementName, Map<String, String> attributes,
                            String text) throws SAXException {
    String id = attributes.get("id");
    float x = parseFloat(attributes, "x");
    float y = parseFloat(attributes, "y");
    Label label = id != null
        ? new Label(id, text, x, y)
        : new Label(text, x, y);
    return (Label)resolveObject(label, elementName, attributes);
  }

  /**
   * Sets the attributes of the given <code>label</code>.
   * If needed, this method should be called from {@link #endElement}.
   */
  protected void setLabelAttributes(Label label,
                                    String elementName,
                                    Map<String, String> attributes) throws SAXException {
    setProperties(label);
    label.setStyle(this.textStyles.peek().get(UNIQUE_ATTRIBUTE));
    Float angle = parseOptionalFloat(attributes, "angle");
    if (angle != null) {
      label.setAngle(angle);
    }
    Float elevation = parseOptionalFloat(attributes, "elevation");
    if (elevation != null) {
      label.setElevation(elevation);
    }
    Float pitch = parseOptionalFloat(attributes, "pitch");
    if (pitch != null) {
      label.setPitch(pitch);
    }
    label.setColor(parseOptionalColor(attributes, "color"));
    label.setOutlineColor(parseOptionalColor(attributes, "outlineColor"));
  }

  /**
   * Returns a new {@link Baseboard} instance initialized from the given <code>attributes</code>.
   */
  private Baseboard createBaseboard(String elementName,
                                    Map<String, String> attributes) throws SAXException {
    Baseboard baseboard = Baseboard.getInstance(parseFloat(attributes, "thickness"),
        parseFloat(attributes, "height"),
        parseOptionalColor(attributes, "color"),
        this.textures.get(UNIQUE_ATTRIBUTE));
    return (Baseboard)resolveObject(baseboard, elementName, attributes);
  }

  /**
   * Returns a new {@link TextStyle} instance initialized from the given <code>attributes</code>.
   */
  private TextStyle createTextStyle(String elementName,
                                    Map<String, String> attributes) throws SAXException {
    TextStyle.Alignment alignment = TextStyle.Alignment.CENTER;
    String alignmentString = attributes.get("alignment");
    if (alignmentString != null) {
      try {
        alignment = TextStyle.Alignment.valueOf(alignmentString);
      } catch (IllegalArgumentException ex) {
        // Ignore malformed enum constant
      }
    }
    TextStyle textStyle = new TextStyle(attributes.get("fontName"),
        parseFloat(attributes, "fontSize"),
        "true".equals(attributes.get("bold")),
        "true".equals(attributes.get("italic")),
        alignment);
    return (TextStyle)resolveObject(textStyle, elementName, attributes);
  }

  /**
   * Returns a new {@link HomeTexture} instance initialized from the given <code>attributes</code>.
   */
  private HomeTexture createTexture(String elementName,
                                    Map<String, String> attributes) throws SAXException {
    String catalogId = attributes.get("catalogId");
    HomeTexture texture = new HomeTexture(new CatalogTexture(catalogId,
                               attributes.get("name"),
                               parseContent(attributes.get("image"), catalogId, true),
                               parseFloat(attributes, "width"),
                               parseFloat(attributes, "height"),
                               attributes.get("creator")),
        attributes.get("xOffset") != null
            ? parseFloat(attributes, "xOffset")
            : 0,
        attributes.get("yOffset") != null
            ? parseFloat(attributes, "yOffset")
            : 0,
        attributes.get("angle") != null
            ? parseFloat(attributes, "angle")
            : 0,
        attributes.get("scale") != null
            ? parseFloat(attributes, "scale")
            : 1,
        !"false".equals(attributes.get("leftToRightOriented")));
    return (HomeTexture)resolveObject(texture, elementName, attributes);
  }

  /**
   * Returns a new {@link HomeMaterial} instance initialized from the given <code>attributes</code>.
   */
  private HomeMaterial createMaterial(String elementName,
                                      Map<String, String> attributes) throws SAXException {
    HomeMaterial material = new HomeMaterial(
        attributes.get("name"),
        attributes.get("key"),
        parseOptionalColor(attributes, "color"),
        this.materialTexture,
        parseOptionalFloat(attributes, "shininess"));
    return (HomeMaterial)resolveObject(material, elementName, attributes);
  }

  /**
   * Sets the properties of the given <code>object</code>.
   */
  private void setProperties(HomeObject object) {
    for (Map.Entry<String, String> property : this.properties.peek().entrySet()) {
      object.setProperty(property.getKey(), property.getValue());
    }
  }

  /**
   * Returns the color integer from a hexadecimal string.
   */
  private Integer parseOptionalColor(Map<String, String> attributes, String name) throws SAXException {
    String color = attributes.get(name);
    if (color != null) {
      try {
        // Need to use parseLong in case parsed number is bigger than 2^31
        return Integer.valueOf((int)Long.parseLong(color, 16));
      } catch (NumberFormatException ex) {
        throw new SAXException("Invalid value for color attribute " + name, ex);
      }
    } else {
      return null;
    }
  }

  private Integer parseOptionalInteger(Map<String, String> attributes, String name) throws SAXException {
    String value = attributes.get(name);
    if (value != null) {
      try {
        return Integer.parseInt(value);
      } catch (NumberFormatException ex) {
        throw new SAXException("Invalid value for integer attribute " + name, ex);
      }
    } else {
      return null;
    }
  }

  private Long parseOptionalLong(Map<String, String> attributes, String name) throws SAXException {
    String value = attributes.get(name);
    if (value != null) {
      try {
        return Long.parseLong(value);
      } catch (NumberFormatException ex) {
        throw new SAXException("Invalid value for long attribute " + name, ex);
      }
    } else {
      return null;
    }
  }

  private BigDecimal parseOptionalDecimal(Map<String, String> attributes, String name) throws SAXException {
    String value = attributes.get(name);
    if (value != null) {
      try {
        return new BigDecimal(value);
      } catch (NumberFormatException ex) {
        throw new SAXException("Invalid value for decimal attribute " + name, ex);
      }
    } else {
      return null;
    }
  }

  private Float parseOptionalFloat(Map<String, String> attributes, String name) throws SAXException {
    String value = attributes.get(name);
    if (value != null) {
      try {
        return Float.parseFloat(value);
      } catch (NumberFormatException ex) {
        throw new SAXException("Invalid value for float attribute " + name, ex);
      }
    } else {
      return null;
    }
  }

  private float parseFloat(Map<String, String> attributes, String name) throws SAXException {
    String value = attributes.get(name);
    if (value != null) {
      try {
        return Float.parseFloat(value);
      } catch (NumberFormatException ex) {
        throw new SAXException("Invalid value for float attribute " + name, ex);
      }
    } else {
      throw new SAXException("Missing float attribute " + name);
    }
  }

  /**
   * Returns the content object matching the given string.
   */
  private Content parseContent(String contentFile, String catalogId, boolean textureId) throws SAXException {
    if (contentFile != null) {
      try {
        return new URLContent(new URL(contentFile));
      } catch (MalformedURLException ex1) {
        if (this.contentContext != null) {
          try {
            return this.contentContext.lookupContent(contentFile);
          } catch (IOException ex2) {
            throw new SAXException("Invalid content " + contentFile, ex2);
          }
        } else if (catalogId != null && this.preferences != null) {
          // Try to find a resource matching contentFile among catalogs
          if (textureId) {
            for (TexturesCategory category : this.preferences.getTexturesCatalog().getCategories()) {
              for (CatalogTexture texture : category.getTextures()) {
                if (catalogId.equals(texture.getId())
                    && isSameContent(contentFile, texture.getIcon())) {
                  return texture.getIcon();
                }
              }
            }
          } else {
            for (FurnitureCategory category : this.preferences.getFurnitureCatalog().getCategories()) {
              for (CatalogPieceOfFurniture piece : category.getFurniture()) {
                if (catalogId.equals(piece.getId())) {
                  if (isSameContent(contentFile, piece.getIcon())) {
                    return piece.getIcon();
                  } else if (isSameContent(contentFile, piece.getPlanIcon())) {
                    return piece.getPlanIcon();
                  } else if (isSameContent(contentFile, piece.getModel())) {
                    return piece.getModel();
                  }
                }
              }
            }
          }
        }
        throw new SAXException("Missing URL base", ex1);
      }
    } else {
      return null;
    }
  }

  /**
   * Returns <code>true</code> if a content matches a given string.
   */
  private boolean isSameContent(String contentFile, Content content) {
    if (content instanceof ResourceURLContent) {
      ResourceURLContent resourceContent = (ResourceURLContent)content;
      return resourceContent.isJAREntry() && resourceContent.getJAREntryName().equals(contentFile)
          || !resourceContent.isJAREntry() && resourceContent.getURL().toString().endsWith("/" + contentFile);
    } else {
      return false;
    }
  }

  /**
   * Sets the home that will be updated by this handler.
   * If a subclass of this handler uses a root element different from <code>home</code>,
   * it should call this method from {@link #startElement} to store the
   * {@link Home} subclass instance read from the XML stream.
   */
  protected void setHome(Home home) {
    this.home = home;
    this.homeElementName = this.elements.peek();
  }

  /**
   * Returns the home read by this handler.
   */
  public Home getHome() {
    return this.home;
  }

  /**
   * Class storing the ID of the walls connected to a given wall.
   */
  private static final class JoinedWall {
    private final Wall    wall;
    private final String  wallAtStartId;
    private final String  wallAtEndId;

    public JoinedWall(Wall wall, String wallAtStartId, String wallAtEndId) {
      this.wall = wall;
      this.wallAtStartId = wallAtStartId;
      this.wallAtEndId = wallAtEndId;
    }

    public Wall getWall() {
      return this.wall;
    }

    public String getWallAtStartId() {
      return this.wallAtStartId;
    }

    public String getWallAtEndId() {
      return this.wallAtEndId;
    }
  }
}
