返回与属性名称匹配的类的索引属性描述符。

/*

 * Copyright (c) 2003, 2008, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */
 /**
 时 代      J a v a   公   众 号 - nowjava.com
 **/

//package com.nowjava;


import java.beans.IndexedPropertyDescriptor;

import java.beans.IntrospectionException;

import java.beans.Introspector;


import java.beans.PropertyDescriptor;


public class Main {



    /**

     * Returns an indexed property descriptor for the class

     * that matches the property name.

     *

     * @param type  the class to introspect

     * @param name  the name of the property to search

     * @return the {@code IndexedPropertyDescriptor}

     */

    public static IndexedPropertyDescriptor getIndexedPropertyDescriptor(

            Class type, String name) {

        PropertyDescriptor pd = findPropertyDescriptor(type, name);

        if (pd instanceof IndexedPropertyDescriptor) {

            return (IndexedPropertyDescriptor) pd;

        }
        /**
         * NowJava.com - 时  代  Java 提 供 
        **/

        reportPropertyDescriptor(pd);

        throw new Error("could not find indexed property '" + name

                + "' in " + type);

    }


    /**

     * Finds a property descriptor for the class

     * that matches the property name.

     *

     * @param type the class to introspect

     * @param name the name of the property to search

     * @return the {@code PropertyDescriptor}, {@code IndexedPropertyDescriptor} or {@code null}

     */

    public static PropertyDescriptor findPropertyDescriptor(Class type,

            String name) {

        PropertyDescriptor[] pds = getPropertyDescriptors(type);

        for (PropertyDescriptor pd : pds) {

            if (pd.getName().equals(name)) {

                return pd;

            }

        }

        return null;

    }


    /**

     * Reports all the interesting information in an Indexed/PropertyDescrptor.

     */

    public static void reportPropertyDescriptor(PropertyDescriptor pd) {

        System.out.println("property name:  " + pd.getName());

        System.out.println("         type:  " + pd.getPropertyType());

        System.out.println("         read:  " + pd.getReadMethod());

        System.out.println("         write: " + pd.getWriteMethod());

        if (pd instanceof IndexedPropertyDescriptor) {

            IndexedPropertyDescriptor ipd = (IndexedPropertyDescriptor) pd;

            System.out.println(" indexed type: "

                    + ipd.getIndexedPropertyType());

            System.out.println(" indexed read: "

                    + ipd.getIndexedReadMethod());

            System.out.println(