/* Copyright (C) 2004-2007  The Chemistry Development Kit (CDK) project
 *
 *  Contact: cdk-devel@lists.sourceforge.net
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public License
 *  as published by the Free Software Foundation; either version 2.1
 *  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 Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 */
package org.openscience.cdk.qsar.descriptors.atomic;

import org.openscience.cdk.exception.CDKException;
import org.openscience.cdk.interfaces.IAtom;
import org.openscience.cdk.interfaces.IAtomContainer;
import org.openscience.cdk.qsar.AbstractAtomicDescriptor;
import org.openscience.cdk.qsar.DescriptorSpecification;
import org.openscience.cdk.qsar.DescriptorValue;
import org.openscience.cdk.qsar.IAtomicDescriptor;
import org.openscience.cdk.qsar.result.DoubleResult;
import org.openscience.cdk.tools.periodictable.PeriodicTable;

import java.io.IOException;

/**
 *  This class return the VdW radius of a given atom.
 *
 * <table border="1"><caption>Parameters for this descriptor:</caption>
 *   <tr>
 *     <td>Name</td>
 *     <td>Default</td>
 *     <td>Description</td>
 *   </tr>
 *   <tr>
 *     <td></td>
 *     <td></td>
 *     <td></td>
 *   </tr>
 * </table>
 *
 * @author         mfe4
 * @cdk.created    2004-11-13
 * @cdk.module     qsaratomic
 * @cdk.githash
 * @cdk.dictref qsar-descriptors:vdwradius
 */
public class VdWRadiusDescriptor extends AbstractAtomicDescriptor implements IAtomicDescriptor {

    private static final String[] NAMES = {"vdwRadius"};

    /**
     *  Constructor for the VdWRadiusDescriptor object.
     *
     *  @throws IOException if an error ocurrs when reading atom type information
     *  @throws ClassNotFoundException if an error occurs during tom typing
     */
    public VdWRadiusDescriptor() throws IOException, ClassNotFoundException {}

    /**
     * Returns a <code>Map</code> which specifies which descriptor
     * is implemented by this class.
     *
     * These fields are used in the map:
     * <ul>
     * <li>Specification-Reference: refers to an entry in a unique dictionary
     * <li>Implementation-Title: anything
     * <li>Implementation-Identifier: a unique identifier for this version of
     *  this class
     * <li>Implementation-Vendor: CDK, JOELib, or anything else
     * </ul>
     *
     * @return An object containing the descriptor specification
     */
    @Override
    public DescriptorSpecification getSpecification() {
        return new DescriptorSpecification(
                "http://www.blueobelisk.org/ontologies/chemoinformatics-algorithms/#vdwradius", this.getClass()
                        .getName(), "The Chemistry Development Kit");
    }

    /**
     * This descriptor does have any parameter.
     */
    @Override
    public void setParameters(Object[] params) throws CDKException {}

    /**
     *  Gets the parameters attribute of the VdWRadiusDescriptor object.
     *
     *@return    The parameters value
     * @see #setParameters
     */
    @Override
    public Object[] getParameters() {
        return null;
    }

    @Override
    public String[] getDescriptorNames() {
        return NAMES;
    }

    /**
     *  This method calculate the Van der Waals radius of an atom.
     *
     *@param  container         The {@link IAtomContainer} for which the descriptor is to be calculated
     *@return                   The Van der Waals radius of the atom
     */

    @Override
    public DescriptorValue calculate(IAtom atom, IAtomContainer container) {
        String symbol = atom.getSymbol();
        double vdwradius = PeriodicTable.getVdwRadius(symbol);
        return new DescriptorValue(getSpecification(), getParameterNames(), getParameters(),
                new DoubleResult(vdwradius), NAMES);

    }

    /**
     *  Gets the parameterNames attribute of the VdWRadiusDescriptor object.
     *
     *@return    The parameterNames value
     */
    @Override
    public String[] getParameterNames() {
        return new String[0];
    }

    /**
     * Gets the parameterType attribute of the VdWRadiusDescriptor object.
     *
     * @param  name  Description of the Parameter
     * @return       An Object of class equal to that of the parameter being requested
     */
    @Override
    public Object getParameterType(String name) {
        return null;
    }
}
