| /* |
| * 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 $Revision$ $Date$ |
| */ |
| public class JXPathBasicBeanInfo implements JXPathBeanInfo { |
| private boolean atomic = false; |
| private Class clazz; |
| private PropertyDescriptor[] propertyDescriptors; |
| private Class dynamicPropertyHandlerClass; |
| private 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, new Comparator() { |
| public int compare(Object left, Object right) { |
| return ((PropertyDescriptor) left).getName().compareTo( |
| ((PropertyDescriptor) right).getName()); |
| } |
| }); |
| propertyDescriptors = descriptors; |
| } |
| catch (IntrospectionException ex) { |
| ex.printStackTrace(); |
| } |
| } |
| } |
| return propertyDescriptors; |
| } |
| |
| 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(); |
| } |
| } |