- /*
- * Copyright 1999-2004 The Apache Software Foundation
- *
- * Licensed 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;
-
- /**
- * 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, java.beans.Introspector
- *
- * @author Dmitri Plotnikov
- * @version $Revision: 1.9 $ $Date: 2004/05/08 15:03:36 $
- */
- public class JXPathBasicBeanInfo implements JXPathBeanInfo {
- private boolean atomic = false;
- private Class clazz;
- private PropertyDescriptor propertyDescriptors[];
- private String[] propertyNames;
- private Class dynamicPropertyHandlerClass;
-
- public JXPathBasicBeanInfo(Class clazz) {
- this.clazz = clazz;
- }
-
- public JXPathBasicBeanInfo(Class clazz, boolean atomic) {
- this.clazz = clazz;
- this.atomic = atomic;
- }
-
- 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.
- */
- public boolean isAtomic() {
- return atomic;
- }
-
- /**
- * Return true if the corresponding objects have dynamic properties.
- */
- public boolean isDynamic() {
- return dynamicPropertyHandlerClass != null;
- }
-
- public PropertyDescriptor[] getPropertyDescriptors() {
- if (propertyDescriptors == null) {
- try {
- BeanInfo bi = null;
- if (clazz.isInterface()) {
- bi = Introspector.getBeanInfo(clazz);
- }
- else {
- bi = Introspector.getBeanInfo(clazz, Object.class);
- }
- PropertyDescriptor[] pds = bi.getPropertyDescriptors();
- propertyDescriptors = new PropertyDescriptor[pds.length];
- System.arraycopy(pds, 0, propertyDescriptors, 0, pds.length);
- Arrays.sort(propertyDescriptors, new Comparator() {
- public int compare(Object left, Object right) {
- return ((PropertyDescriptor) left).getName().compareTo(
- ((PropertyDescriptor) right).getName());
- }
- });
- }
- catch (IntrospectionException ex) {
- ex.printStackTrace();
- }
- }
- return propertyDescriptors;
- }
-
- public PropertyDescriptor getPropertyDescriptor(String propertyName) {
- if (propertyNames == null) {
- PropertyDescriptor[] pds = getPropertyDescriptors();
- propertyNames = new String[pds.length];
- for (int i = 0; i < pds.length; i++) {
- propertyNames[i] = pds[i].getName();
- }
- }
-
- for (int i = 0; i < propertyNames.length; i++) {
- if (propertyNames[i] == propertyName) {
- return propertyDescriptors[i];
- }
- }
-
- for (int i = 0; i < propertyNames.length; i++) {
- if (propertyNames[i].equals(propertyName)) {
- return propertyDescriptors[i];
- }
- }
- return null;
- }
-
- /**
- * For a dynamic class, returns the corresponding DynamicPropertyHandler
- * 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();
- }
- }