/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.jxpath;
import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.util.Arrays;
import java.util.Comparator;
import java.util.HashMap;
/**
* An implementation of JXPathBeanInfo based on JavaBeans' BeanInfo. Properties
* advertised by JXPathBasicBeanInfo are the same as those advertised by
* BeanInfo for the corresponding class.
*
* @see java.beans.BeanInfo
* @see java.beans.Introspector
*
* @author Dmitri Plotnikov
* @version $Revision: 668329 $ $Date: 2008-06-16 16:59:48 -0500 (Mon, 16 Jun 2008) $
*/
public class JXPathBasicBeanInfo implements JXPathBeanInfo {
private static final long serialVersionUID = -3863803443111484155L;
private static final Comparator PROPERTY_DESCRIPTOR_COMPARATOR = new Comparator() {
public int compare(Object left, Object right) {
return ((PropertyDescriptor) left).getName().compareTo(
((PropertyDescriptor) right).getName());
}
};
private boolean atomic = false;
private Class clazz;
private Class dynamicPropertyHandlerClass;
private transient PropertyDescriptor[] propertyDescriptors;
private transient HashMap propertyDescriptorMap;
/**
* Create a new JXPathBasicBeanInfo.
* @param clazz bean class
*/
public JXPathBasicBeanInfo(Class clazz) {
this.clazz = clazz;
}
/**
* Create a new JXPathBasicBeanInfo.
* @param clazz bean class
* @param atomic whether objects of this class are treated as atomic
* objects which have no properties of their own.
*/
public JXPathBasicBeanInfo(Class clazz, boolean atomic) {
this.clazz = clazz;
this.atomic = atomic;
}
/**
* Create a new JXPathBasicBeanInfo.
* @param clazz bean class
* @param dynamicPropertyHandlerClass dynamic property handler class
*/
public JXPathBasicBeanInfo(Class clazz, Class dynamicPropertyHandlerClass) {
this.clazz = clazz;
this.atomic = false;
this.dynamicPropertyHandlerClass = dynamicPropertyHandlerClass;
}
/**
* Returns true if objects of this class are treated as atomic
* objects which have no properties of their own.
* @return boolean
*/
public boolean isAtomic() {
return atomic;
}
/**
* Return true if the corresponding objects have dynamic properties.
* @return boolean
*/
public boolean isDynamic() {
return dynamicPropertyHandlerClass != null;
}
public synchronized PropertyDescriptor[] getPropertyDescriptors() {
if (propertyDescriptors == null) {
if (clazz == Object.class) {
propertyDescriptors = new PropertyDescriptor[0];
}
else {
try {
BeanInfo bi = null;
if (clazz.isInterface()) {
bi = Introspector.getBeanInfo(clazz);
}
else {
bi = Introspector.getBeanInfo(clazz, Object.class);
}
PropertyDescriptor[] pds = bi.getPropertyDescriptors();
PropertyDescriptor[] descriptors = new PropertyDescriptor[pds.length];
System.arraycopy(pds, 0, descriptors, 0, pds.length);
Arrays.sort(descriptors, PROPERTY_DESCRIPTOR_COMPARATOR);
propertyDescriptors = descriptors;
}
catch (IntrospectionException ex) {
ex.printStackTrace();
}
}
}
if (propertyDescriptors.length == 0) {
return propertyDescriptors;
}
PropertyDescriptor[] result = new PropertyDescriptor[propertyDescriptors.length];
System.arraycopy(propertyDescriptors, 0, result, 0, propertyDescriptors.length);
return result;
}
public synchronized PropertyDescriptor getPropertyDescriptor(String propertyName) {
if (propertyDescriptorMap == null) {
propertyDescriptorMap = new HashMap();
PropertyDescriptor[] pds = getPropertyDescriptors();
for (int i = 0; i < pds.length; i++) {
propertyDescriptorMap.put(pds[i].getName(), pds[i]);
}
}
return (PropertyDescriptor) propertyDescriptorMap.get(propertyName);
}
/**
* For a dynamic class, returns the corresponding DynamicPropertyHandler
* class.
* @return Class
*/
public Class getDynamicPropertyHandlerClass() {
return dynamicPropertyHandlerClass;
}
public String toString() {
StringBuffer buffer = new StringBuffer();
buffer.append("BeanInfo [class = ");
buffer.append(clazz.getName());
if (isDynamic()) {
buffer.append(", dynamic");
}
if (isAtomic()) {
buffer.append(", atomic");
}
buffer.append(", properties = ");
PropertyDescriptor[] jpds = getPropertyDescriptors();
for (int i = 0; i < jpds.length; i++) {
buffer.append("\n ");
buffer.append(jpds[i].getPropertyType());
buffer.append(": ");
buffer.append(jpds[i].getName());
}
buffer.append("]");
return buffer.toString();
}
}
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