/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* $Id$ */

package org.apache.fop.afp.modca;

import java.io.IOException;
import java.io.OutputStream;
import java.util.List;

/**
 * A page segment is a MO:DCA-P resource object.  It may be stored in an
 * external resource library or it may be carried in a resource group.
 * Page segments contain any combination of IOCA image objects and
 * GOCA graphics objects.
 */
public class PageSegment extends AbstractNamedAFPObject {

    private List<AbstractAFPObject> objects;

    /**
     * Main constructor
     *
     * @param name the name of this object
     */
    public PageSegment(String name) {
        super(name);
    }

    /**
     * Returns a list of objects contained withing this page segment
     *
     * @return a list of objects contained within this page segment
     */
    public List<AbstractAFPObject> getObjects() {
        if (objects == null) {
            objects = new java.util.ArrayList();
        }
        return objects;
    }

    /**
     * Adds a resource object (image/graphic) to this page segment
     *
     * @param object the resource objec to add to this page segment
     */
    public void addObject(AbstractAFPObject object) {
        getObjects().add(object);
    }

    /** {@inheritDoc} */
    protected void writeStart(OutputStream os) throws IOException {
        byte[] data = new byte[17];
        copySF(data, Type.BEGIN, Category.PAGE_SEGMENT);
        os.write(data);
    }

    /** {@inheritDoc} */
    protected void writeContent(OutputStream os) throws IOException {
        super.writeContent(os);
        writeObjects(objects, os);
    }

    /** {@inheritDoc} */
    protected void writeEnd(OutputStream os) throws IOException {
        byte[] data = new byte[17];
        copySF(data, Type.END, Category.PAGE_SEGMENT);
        os.write(data);
    }

    /** {@inheritDoc} */
    public String toString() {
        return this.name;
    }
}
