Java tutorial
/* * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved. * * This software is open source. * See the bottom of this file for the licence. */ package org.dom4j.bean; import org.dom4j.Attribute; import org.dom4j.DocumentFactory; import org.dom4j.Element; import org.dom4j.QName; import org.dom4j.tree.DefaultAttribute; import org.xml.sax.Attributes; /** * <p> * <code>BeanDocumentFactory</code> is a factory of DOM4J objects which may be * BeanElements which are backed by JavaBeans and their properties. * </p> * * <p> * The tree built allows full XPath expressions from anywhere on the tree. * </p> * * @author <a href="mailto:jstrachan@apache.org">James Strachan </a> * @version $Revision: 1.14 $ */ public class BeanDocumentFactory extends DocumentFactory { /** The Singleton instance */ private static BeanDocumentFactory singleton = new BeanDocumentFactory(); /** * <p> * Access to the singleton instance of this factory. * </p> * * @return the default singleon instance */ public static DocumentFactory getInstance() { return singleton; } // Factory methods public Element createElement(QName qname) { Object bean = createBean(qname); if (bean == null) { return new BeanElement(qname); } else { return new BeanElement(qname, bean); } } public Element createElement(QName qname, Attributes attributes) { Object bean = createBean(qname, attributes); if (bean == null) { return new BeanElement(qname); } else { return new BeanElement(qname, bean); } } public Attribute createAttribute(Element owner, QName qname, String value) { return new DefaultAttribute(qname, value); } // Implementation methods protected Object createBean(QName qname) { return null; } protected Object createBean(QName qname, Attributes attributes) { String value = attributes.getValue("class"); if (value != null) { try { Class<?> beanClass = Class.forName(value, true, BeanDocumentFactory.class.getClassLoader()); return beanClass.newInstance(); } catch (Exception e) { handleException(e); } } return null; } protected void handleException(Exception e) { // ignore introspection exceptions System.out.println("#### Warning: couldn't create bean: " + e); } } /* * Redistribution and use of this software and associated documentation * ("Software"), with or without modification, are permitted provided that the * following conditions are met: * * 1. Redistributions of source code must retain copyright statements and * notices. Redistributions must also contain a copy of this document. * * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * 3. The name "DOM4J" must not be used to endorse or promote products derived * from this Software without prior written permission of MetaStuff, Ltd. For * written permission, please contact dom4j-info@metastuff.com. * * 4. Products derived from this Software may not be called "DOM4J" nor may * "DOM4J" appear in their names without prior written permission of MetaStuff, * Ltd. DOM4J is a registered trademark of MetaStuff, Ltd. * * 5. Due credit should be given to the DOM4J Project - http://www.dom4j.org * * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL METASTUFF, LTD. OR ITS CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved. */