001/* ========================================================================
002 * JCommon : a free general purpose class library for the Java(tm) platform
003 * ========================================================================
004 *
005 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
006 * 
007 * Project Info:  http://www.jfree.org/jcommon/index.html
008 *
009 * This library is free software; you can redistribute it and/or modify it 
010 * under the terms of the GNU Lesser General Public License as published by 
011 * the Free Software Foundation; either version 2.1 of the License, or 
012 * (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but 
015 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
016 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
017 * License for more details.
018 *
019 * You should have received a copy of the GNU Lesser General Public
020 * License along with this library; if not, write to the Free Software
021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
022 * USA.  
023 *
024 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
025 * in the United States and other countries.]
026 * 
027 * ------------------------
028 * SimpleObjectFactory.java
029 * ------------------------
030 * (C)opyright 2003-2005, by Thomas Morgner and Contributors.
031 *
032 * Original Author:  Thomas Morgner;
033 * Contributor(s):   David Gilbert (for Object Refinery Limited);
034 *
035 * $Id: SimpleObjectFactory.java,v 1.3 2005/10/18 13:33:53 mungady Exp $
036 *
037 * Changes 
038 * -------
039 * 02-Dec-2003 : Initial version
040 *  
041 */
042
043package org.jfree.xml.util;
044
045import java.util.HashMap;
046
047/**
048 * A simple object factory.
049 */
050public class SimpleObjectFactory implements ObjectFactory {
051
052    /** The object mappings. */
053    private HashMap objectMappings;
054    
055    /** The manual object mappings. */
056    private HashMap manualMappings;
057    
058    /** The multiplex mappings. */
059    private HashMap multiplexMappings;
060
061    /**
062     * Creates a new instance.
063     */
064    public SimpleObjectFactory() {
065        this.objectMappings = new HashMap();
066        this.manualMappings = new HashMap();
067        this.multiplexMappings = new HashMap();
068    }
069
070    /**
071     * Adds a manual mapping.
072     * 
073     * @param mapping  the mapping.
074     */
075    public void addManualMapping(final ManualMappingDefinition mapping) {
076        this.manualMappings.put(mapping.getBaseClass(), mapping);
077    }
078
079    /**
080     * Adds a generic handler.
081     * 
082     * @param handler  the handler.
083     */
084    public void addGenericHandler(final GenericObjectFactory handler) {
085        this.objectMappings.put(handler.getBaseClass(), handler);
086    }
087
088    /**
089     * Adds a multiplex mapping.
090     * 
091     * @param mplex  the multiplex mapping.
092     */
093    public void addMultiplexMapping(final MultiplexMappingDefinition mplex) {
094        this.multiplexMappings.put(mplex.getBaseClass(), mplex);
095    }
096
097    /**
098     * Clears the mappings.
099     */
100    public void clear() {
101        this.objectMappings.clear();
102        this.manualMappings.clear();
103        this.multiplexMappings.clear();
104    }
105
106    /**
107     * Returns a factory instance for the given class. The factory is independent
108     * from all previously generated instances.
109     *
110     * @param c the class
111     * @return the object factory.
112     */
113    public GenericObjectFactory getFactoryForClass(final Class c) {
114        final GenericObjectFactory factory = (GenericObjectFactory) this.objectMappings.get(c);
115        if (factory == null) {
116            return null;
117        }
118        return factory.getInstance();
119    }
120
121    /**
122     * Returns the manual mapping definition for the given class, or null, if
123     * not manual definition exists.
124     *
125     * @param c the class for which to check the existence of the definition
126     * @return the manual mapping definition or null.
127     */
128    public ManualMappingDefinition getManualMappingDefinition(final Class c) {
129        return (ManualMappingDefinition) this.manualMappings.get(c);
130    }
131
132    /**
133     * Returns the multiplex definition for the given class, or null, if no
134     * such definition exists.
135     *
136     * @param c the class for which to check the existence of the multiplexer
137     * @return the multiplexer for the class, or null if no multiplexer exists.
138     */
139    public MultiplexMappingDefinition getMultiplexDefinition(final Class c) {
140        final MultiplexMappingDefinition definition = (MultiplexMappingDefinition)
141        this.multiplexMappings.get(c);
142        return definition;
143    }
144
145    /**
146     * Checks, whether a generic handler exists for the given class. This does
147     * not check, whether an mapping exists.
148     *
149     * @param c the class for which to check
150     * @return true, if an generic handler is defined, false otherwise.
151     */
152    public boolean isGenericHandler(final Class c) {
153        return this.objectMappings.containsKey(c);
154    }
155}