Displays properties for a given class using introspection. - Java Reflection

Java examples for Reflection:Class

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Description

Displays properties for a given class using introspection.

Demo Code

/* ====================================================================
 * The VM Systems, Inc. Software License, Version 1.0
 *
 * Copyright (c) 2002 VM Systems, Inc.  All rights reserved.
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 * THIS SOFTWARE IS PROVIDED PURSUANT TO THE TERMS OF THIS LICENSE.
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 * modification, are permitted provided that the following conditions
 * are met://from  w  w  w.j  av  a  2  s  .  co m
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
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 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by
 *        VM Systems, Inc. (http://www.vmguys.com/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 *    derived from this software without prior written permission. For written
 *    permission, please contact info@vmguys.com.
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 * 5. VM Systems, Inc. and any other person or entity that creates or
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 * COMPLIANCE WITH APPLICABLE LAWS OR INTERRUPTION OF OPERATIONS.
 * ====================================================================
 */
//package com.java2s;

import java.beans.*;

public class Main {
    /** Displays properties for a given class using introspection.
     */
    static public String displayProperties(Class cls)
            throws IntrospectionException {
        BeanInfo beanInfo = Introspector.getBeanInfo(cls);
        if (beanInfo == null) {
            return "No beans; getBeanInfo() returned null for "
                    + cls.getName();
        }
        PropertyDescriptor[] properties = beanInfo.getPropertyDescriptors();
        StringBuffer result = new StringBuffer();
        for (int i = 0; i < properties.length; i++) {
            result.append("Property " + (i + 1) + " of "
                    + properties.length + ":\n");
            if (properties[i].getPropertyType() != null) {
                result.append("\tProperty Class: "
                        + properties[i].getPropertyType().getName() + "\n");
            } else
                result.append("\tProperty Class is NULL.\n");
            if (properties[i].getReadMethod() != null) {
                result.append("\tRead method: "
                        + properties[i].getReadMethod().getName() + "\n");
            } else
                result.append("\tRead method is NULL.\n");
            if (properties[i].getWriteMethod() != null) {
                result.append("\tWrite method: "
                        + properties[i].getWriteMethod().getName() + "\n");
            } else
                result.append("\tWrite method is NULL.\n");

        }
        return result.toString();
    }

    /** Returns a list of bean methods in a class.
     * @param className class name to analyze.
     * @return list of bean methods.
     */
    static public String displayProperties(String className)
            throws ClassNotFoundException, IntrospectionException {
        Class cls = java.lang.Class.forName(className);
        return displayProperties(cls);
    }
}

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