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| package org.dom4j.bean; |
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| |
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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 java.util.Map; |
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| |
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| import org.dom4j.DocumentFactory; |
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| import org.dom4j.QName; |
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| public class BeanMetaData { |
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| protected static final Object[] NULL_ARGS = {}; |
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| private static Map singletonCache = new HashMap(); |
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| |
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| private static final DocumentFactory DOCUMENT_FACTORY = BeanDocumentFactory.getInstance(); |
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| private Class beanClass; |
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| private PropertyDescriptor[] propertyDescriptors; |
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| private QName[] qNames; |
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| private Method[] readMethods; |
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| private Method[] writeMethods; |
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| private Map nameMap = new HashMap(); |
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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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| } |
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| return answer;
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| } |
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| |
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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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| try {
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| BeanInfo beanInfo = Introspector.getBeanInfo( beanClass );
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| propertyDescriptors = beanInfo.getPropertyDescriptors();
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| } |
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| catch (IntrospectionException e) { |
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| handleException(e);
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| } |
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| } |
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| if ( propertyDescriptors == null ) {
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| propertyDescriptors = new PropertyDescriptor[0];
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| } |
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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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| qNames[i] = qName;
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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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| } |
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| } |
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| public int attributeCount() {
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| return propertyDescriptors.length;
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| } |
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| |
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| public BeanAttributeList createAttributeList(BeanElement parent) {
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| return new BeanAttributeList( parent, this );
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| } |
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| |
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| public QName getQName(int index) {
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| return qNames[index];
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| } |
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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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| } |
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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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| } |
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| public Object getData(int index, Object bean) {
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| try {
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| Method method = readMethods[index];
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| return method.invoke( bean, NULL_ARGS );
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| } |
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| catch (Exception e) { |
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| handleException(e);
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| return null;
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| } |
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| } |
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| public void setData(int index, Object bean, Object data) {
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| try {
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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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| } |
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| catch (Exception e) { |
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| handleException(e);
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| } |
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| } |
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| protected void handleException(Exception e) {
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| } |
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| } |
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