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 * ObjectRefHandler.java
029 * ---------------------
030 * (C)opyright 2003, by Thomas Morgner and Contributors.
031 *
032 * Original Author:  Thomas Morgner;
033 * Contributor(s):   David Gilbert (for Object Refinery Limited);
034 *
035 * $Id: ObjectRefHandler.java,v 1.3 2005/10/18 13:33:32 mungady Exp $
036 *
037 * Changes
038 * -------
039 * 29-Sep-2003 : Initial version (TM);
040 * 25-Nov-2003 : Updated header and Javadocs (DG);
041 *
042 */
043
044package org.jfree.xml.parser.coretypes;
045
046import org.jfree.xml.parser.AbstractXmlReadHandler;
047import org.xml.sax.Attributes;
048import org.xml.sax.SAXException;
049
050/**
051 * A SAX handler for an object reference.
052 */
053public class ObjectRefHandler extends AbstractXmlReadHandler {
054
055    /** The object. */
056    private Object object;
057  
058    /** The property name. */
059    private String propertyName;
060
061    /**
062     * Creates a new handler.
063     */
064    public ObjectRefHandler() {
065        super();
066    }
067
068    /**
069     * Starts parsing.
070     * 
071     * @param attrs  the attributes.
072     * 
073     * @throws SAXException ???.
074     */
075    protected void startParsing(final Attributes attrs) throws SAXException {
076        final String tagName = getTagName();
077        if (tagName.equals("objectRef")) {
078            final String sourceName = attrs.getValue("source");
079            if (sourceName == null) {
080                throw new SAXException("Source name is not defined.");
081            }
082            this.propertyName = attrs.getValue("property");
083            if (this.propertyName == null) {
084                throw new SAXException("Property name is not defined.");
085            }
086
087            this.object = getRootHandler().getHelperObject(sourceName);
088            if (this.object == null) {
089                throw new SAXException("Referenced object is undefined.");
090            }
091        }
092    }
093
094    /**
095     * Returns the property name.
096     * 
097     * @return the property name.
098     */
099    public String getPropertyName() {
100        return this.propertyName;
101    }
102
103    /**
104     * Returns the value.
105     * 
106     * @return the value.
107     */
108    public Object getObject() {
109        return this.object;
110    }
111
112}