    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}