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* Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
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* This software is open source.
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* See the bottom of this file for the licence.
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package org.dom4j.bean;
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import java.beans.BeanInfo;
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import java.beans.IntrospectionException;
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import java.beans.Introspector;
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import java.beans.PropertyDescriptor;
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import java.lang.reflect.Method;
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import java.util.HashMap;
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import org.dom4j.DocumentFactory;
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import org.dom4j.QName;
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* <code>BeanMetaData</code> contains metadata about a bean class.
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* @author <a href="mailto:james.strachan@metastuff.com">James Strachan </a>
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* @version $Revision: 1.10 $
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public class BeanMetaData {
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/** Empty arguments for reflection calls */
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protected static final Object[] NULL_ARGS = {};
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/** Singleton cache */
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private static Map singletonCache = new HashMap();
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private static final DocumentFactory DOCUMENT_FACTORY = BeanDocumentFactory
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/** The class of the bean */
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private Class beanClass;
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/** Property descriptors for the bean */
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private PropertyDescriptor[] propertyDescriptors;
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/** QNames for the attributes */
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private QName[] qNames;
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/** Read methods used for getting properties */
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private Method[] readMethods;
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/** Write methods used for setting properties */
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private Method[] writeMethods;
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/** Index of names and QNames to indices */
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private Map nameMap = new HashMap();
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public BeanMetaData(Class beanClass) {
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this.beanClass = beanClass;
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if (beanClass != null) {
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BeanInfo beanInfo = Introspector.getBeanInfo(beanClass);
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propertyDescriptors = beanInfo.getPropertyDescriptors();
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} catch (IntrospectionException e) {
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if (propertyDescriptors == null) {
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propertyDescriptors = new PropertyDescriptor[0];
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int size = propertyDescriptors.length;
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qNames = new QName[size];
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readMethods = new Method[size];
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writeMethods = new Method[size];
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for (int i = 0; i < size; i++) {
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PropertyDescriptor propertyDescriptor = propertyDescriptors[i];
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String name = propertyDescriptor.getName();
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QName qName = DOCUMENT_FACTORY.createQName(name);
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readMethods[i] = propertyDescriptor.getReadMethod();
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writeMethods[i] = propertyDescriptor.getWriteMethod();
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Integer index = new Integer(i);
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nameMap.put(name, index);
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nameMap.put(qName, index);
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* Static helper method to find and cache meta data objects for bean types
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* @return DOCUMENT ME!
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public static BeanMetaData get(Class beanClass) {
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BeanMetaData answer = (BeanMetaData) singletonCache.get(beanClass);
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if (answer == null) {
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answer = new BeanMetaData(beanClass);
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singletonCache.put(beanClass, answer);
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* @return the number of attribtutes for this bean type
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public int attributeCount() {
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return propertyDescriptors.length;
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public BeanAttributeList createAttributeList(BeanElement parent) {
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return new BeanAttributeList(parent, this);
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public QName getQName(int index) {
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return qNames[index];
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public int getIndex(String name) {
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Integer index = (Integer) nameMap.get(name);
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return (index != null) ? index.intValue() : (-1);
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public int getIndex(QName qName) {
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Integer index = (Integer) nameMap.get(qName);
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return (index != null) ? index.intValue() : (-1);
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public Object getData(int index, Object bean) {
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Method method = readMethods[index];
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return method.invoke(bean, NULL_ARGS);
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} catch (Exception e) {
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public void setData(int index, Object bean, Object data) {
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Method method = writeMethods[index];
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Object[] args = {data};
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method.invoke(bean, args);
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} catch (Exception e) {
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// Implementation methods
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// -------------------------------------------------------------------------
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protected void handleException(Exception e) {
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// ignore introspection exceptions
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* Redistribution and use of this software and associated documentation
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* ("Software"), with or without modification, are permitted provided that the
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* following conditions are met:
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* 1. Redistributions of source code must retain copyright statements and
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* notices. Redistributions must also contain a copy of this document.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name "DOM4J" must not be used to endorse or promote products derived
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* from this Software without prior written permission of MetaStuff, Ltd. For
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* written permission, please contact dom4j-info@metastuff.com.
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* 4. Products derived from this Software may not be called "DOM4J" nor may
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* "DOM4J" appear in their names without prior written permission of MetaStuff,
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* Ltd. DOM4J is a registered trademark of MetaStuff, Ltd.
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* 5. Due credit should be given to the DOM4J Project - http://www.dom4j.org
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* THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL METASTUFF, LTD. OR ITS CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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* Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
added
removed
src/java/org/dom4j/bean/BeanMetaData.java
