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Commons JXPath example source code file (JXPathBasicBeanInfo.java)

This example Commons JXPath source code file (JXPathBasicBeanInfo.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons JXPath tags/keywords

bean, beaninfo, class, class, comparator, comparator, hashmap, javabean, jxpathbasicbeaninfo, jxpathbasicbeaninfo, jxpathbeaninfo, property_descriptor_comparator, propertydescriptor, propertydescriptor, string, stringbuffer, util

The Commons JXPath JXPathBasicBeanInfo.java source code

/*
 * 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();
    }
}

Other Commons JXPath examples (source code examples)

Here is a short list of links related to this Commons JXPath JXPathBasicBeanInfo.java source code file:

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