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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.]
 * 
 * -------------------------------
 * MultiplexMappingDefinition.java
 * -------------------------------
 * (C)opyright 2003-2005, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: MultiplexMappingDefinition.java,v 1.3 2005/10/18 13:33:53 mungady Exp $
 *
 * Changes 
 * -------
 * 22-Nov-2003 : Initial version
 *  
 */

package org.jfree.xml.util;

import java.util.HashMap;

/**
 * Maps a class to ...
 */
public class MultiplexMappingDefinition {

    /** The class. */
    private Class baseClass;

    /** The attribute name. */
    private String attributeName;
    
    /** The forward mappings. */
    private HashMap forwardMappings;
    
    /** The reverse mappings. */
    private HashMap reverseMappings;

    /**
     * Creates a new mapping definition.
     * 
     * @param baseClass  the class.
     * @param attributeName  the attribute name.
     * @param entries  the entries.
     */
    public MultiplexMappingDefinition(final Class baseClass,
                                      final String attributeName,
                                      final MultiplexMappingEntry[] entries) {
        
        this.attributeName = attributeName;
        this.baseClass = baseClass;
        this.forwardMappings = new HashMap();
        this.reverseMappings = new HashMap();

        for (int i = 0; i < entries.length; i++) {
            final MultiplexMappingEntry entry = entries[i];
            this.forwardMappings.put(entry.getAttributeValue(), entry);
            this.reverseMappings.put(entry.getTargetClass(), entry);
        }
    }

    /**
     * Returns the attribute name.
     * 
     * @return The attribute name.
     */
    public String getAttributeName() {
        return this.attributeName;
    }

    /**
     * Returns the class.
     * 
     * @return The class.
     */
    public Class getBaseClass() {
        return this.baseClass;
    }

    /**
     * Returns a mapping entry for a type.
     * 
     * @param type  the type.
     * 
     * @return The mapping entry.
     */
    public MultiplexMappingEntry getEntryForType(final String type) {
        return (MultiplexMappingEntry) this.forwardMappings.get(type);
    }

    /**
     * Returns a mapping entry for a class.
     * 
     * @param clazz  the class.
     * 
     * @return The mapping entry.
     */
    public MultiplexMappingEntry getEntryForClass(final String clazz) {
        return (MultiplexMappingEntry) this.reverseMappings.get(clazz);
    }
}