Returns a property descriptor for the class that matches the property name. - Java Reflection

Java examples for Reflection:Property

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Description

Returns a property descriptor for the class that matches the property name.

Demo Code

/*/*from  w w w.  j  av  a  2  s . c o m*/
 * 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.
 */
//package com.java2s;

import java.beans.IntrospectionException;
import java.beans.Introspector;

import java.beans.PropertyDescriptor;

public class Main {


    /**
     * Returns 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}
     */
    public static PropertyDescriptor getPropertyDescriptor(Class type,
            String name) {
        PropertyDescriptor pd = findPropertyDescriptor(type, name);
        if (pd != null) {
            return pd;
        }
        throw new Error("could not find 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;
    }

    /**
     * Returns an array of property descriptors for specified class.
     *
     * @param type  the class to introspect
     * @return an array of property descriptors
     */
    public static PropertyDescriptor[] getPropertyDescriptors(Class type) {
        try {
            return Introspector.getBeanInfo(type).getPropertyDescriptors();
        } catch (IntrospectionException exception) {
            throw new Error("unexpected exception", exception);
        }
    }
}

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