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JCommon is a free general purpose Java class library that is used in several projects at www.jfree.org, including JFreeChart and JFreeReport.
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/* ========================================================================
 * JCommon : a free general purpose class library for the Java(tm) platform
 * ========================================================================
 *
 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
 * 
 * Project Info:  http://www.jfree.org/jcommon/index.html
 *
 * This library 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 library 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 library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
 * USA.  
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 * 
 * -----------------
 * MappingModel.java
 * -----------------
 * (C)opyright 2003, 2004, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: MappingModel.java,v 1.3 2005/10/18 13:32:37 mungady Exp $
 *
 * Changes 
 * -------
 * 20-Nov-2003 : Initial version
 *  
 */

package org.jfree.xml.generator.model;

import java.util.ArrayList;
import java.util.HashMap;

import org.jfree.util.Log;

/**
 * A mapping model.
 */
public class MappingModel {
    
    /** Mapping infos. */
    private HashMap mappingInfos;
    
    /** The manual mappings. */
    private ArrayList manualMappings;
    
    /** The multiplex mappings. */
    private ArrayList multiplexMappings;

    /**
     * Creates a new instance.
     */
    public MappingModel() {
        this.mappingInfos = new HashMap();
        this.manualMappings = new ArrayList();
        this.multiplexMappings = new ArrayList();
    }

    /**
     * Returns the multiplex mapping info.
     * 
     * @return The multiplex mapping info.
     */
    public MultiplexMappingInfo[] getMultiplexMapping() {
        return (MultiplexMappingInfo[]) this.multiplexMappings.toArray(
            new MultiplexMappingInfo[this.multiplexMappings.size()]
        );
    }

    /**
     * Returns the manual mapping info.
     * 
     * @return The manual mapping info.
     */
    public ManualMappingInfo[] getManualMapping() {
        return (ManualMappingInfo[]) this.manualMappings.toArray(
            new ManualMappingInfo[this.manualMappings.size()]
        );
    }

    /**
     * Adds a manual mapping.
     * 
     * @param mappingInfo  the mapping.
     */
    public void addManualMapping(final ManualMappingInfo mappingInfo) {
        if (!this.mappingInfos.containsKey(mappingInfo.getBaseClass())) {
            this.manualMappings.add(mappingInfo);
            this.mappingInfos.put(mappingInfo.getBaseClass(), mappingInfo);
        }
        else {
            final Object o = this.mappingInfos.get(mappingInfo.getBaseClass());
            if (o instanceof ManualMappingInfo) {
                Log.info ("Duplicate manual mapping: " + mappingInfo.getBaseClass());
            }
            else {
                throw new IllegalArgumentException
                    ("This mapping is already a multiplex mapping.");
            }
        }
    }

    /**
     * Adds a multiplex mapping.
     * 
     * @param mappingInfo  the mapping.
     */
    public void addMultiplexMapping(final MultiplexMappingInfo mappingInfo) {
        if (!this.mappingInfos.containsKey(mappingInfo.getBaseClass())) {
            this.multiplexMappings.add(mappingInfo);
            this.mappingInfos.put(mappingInfo.getBaseClass(), mappingInfo);
        }
        else {
            final Object o = this.mappingInfos.get(mappingInfo.getBaseClass());
            if (o instanceof ManualMappingInfo) {
                throw new IllegalArgumentException
                    ("This mapping is already a manual mapping.");
            }
            else {
                Log.info(
                    "Duplicate Multiplex mapping: " + mappingInfo.getBaseClass(), new Exception()
                );
            }
        }

    }

    /**
     * Returns a multiplex mapping for the specified class.
     * 
     * @param baseClass  the base class.
     * 
     * @return The mapping.
     */
    public MultiplexMappingInfo lookupMultiplexMapping(final Class baseClass) {
        final Object o = this.mappingInfos.get(baseClass);
        if (o instanceof MultiplexMappingInfo) {
            return (MultiplexMappingInfo) o;
        }
        return null;
    }

}