    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
    044    package org.jfree.xml.parser.coretypes;
    045
    046    import org.jfree.xml.parser.AbstractXmlReadHandler;
    047    import org.xml.sax.Attributes;
    048    import org.xml.sax.SAXException;
    049
    050    /**
    051     * A SAX handler for an object reference.
    052     */
    053    public 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    }