//: BeanDumper.java
//////////////////////////////////////////////////
// Copyright (c) Bruce Eckel, 1998
// Source code file from the book "Thinking in Java"
// All rights reserved EXCEPT as allowed by the
// following statements: You can freely use this file
// for your own work (personal or commercial),
// including modifications and distribution in
// executable form only. Permission is granted to use
// this file in classroom situations, including its
// use in presentation materials, as long as the book
// "Thinking in Java" is cited as the source.
// Except in classroom situations, you cannot copy
// and distribute this code; instead, the sole
// distribution point is http://www.BruceEckel.com
// (and official mirror sites) where it is
// freely available. You cannot remove this
// copyright and notice. You cannot distribute
// modified versions of the source code in this
// package. You cannot use this file in printed
// media without the express permission of the
// author. Bruce Eckel makes no representation about
// the suitability of this software for any purpose.
// It is provided "as is" without express or implied
// warranty of any kind, including any implied
// warranty of merchantability, fitness for a
// particular purpose or non-infringement. The entire
// risk as to the quality and performance of the
// software is with you. Bruce Eckel and the
// publisher shall not be liable for any damages
// suffered by you or any third party as a result of
// using or distributing software. In no event will
// Bruce Eckel or the publisher be liable for any
// lost revenue, profit, or data, or for direct,
// indirect, special, consequential, incidental, or
// punitive damages, however caused and regardless of
// the theory of liability, arising out of the use of
// or inability to use software, even if Bruce Eckel
// and the publisher have been advised of the
// possibility of such damages. Should the software
// prove defective, you assume the cost of all
// necessary servicing, repair, or correction. If you
// think you've found an error, please email all
// modified files with clearly commented changes to:
// Bruce@EckelObjects.com. (Please use the same
// address for non-code errors found in the book.)
/////////////////////////////////////////////////
// A method to introspect a Bean
import java.beans.*;
import java.lang.reflect.*;
public class BeanDumper {
public static void dump(Class bean){
BeanInfo bi = null;
try {
bi = Introspector.getBeanInfo(
bean, java.lang.Object.class);
} catch(IntrospectionException ex) {
System.out.println("Couldn't introspect " +
bean.getName());
System.exit(1);
}
PropertyDescriptor[] properties =
bi.getPropertyDescriptors();
for(int i = 0; i < properties.length; i++) {
Class p = properties[i].getPropertyType();
System.out.println(
"Property type:\n " + p.getName());
System.out.println(
"Property name:\n " +
properties[i].getName());
Method readMethod =
properties[i].getReadMethod();
if(readMethod != null)
System.out.println(
"Read method:\n " +
readMethod.toString());
Method writeMethod =
properties[i].getWriteMethod();
if(writeMethod != null)
System.out.println(
"Write method:\n " +
writeMethod.toString());
System.out.println("====================");
}
System.out.println("Public methods:");
MethodDescriptor[] methods =
bi.getMethodDescriptors();
for(int i = 0; i < methods.length; i++)
System.out.println(
methods[i].getMethod().toString());
System.out.println("======================");
System.out.println("Event support:");
EventSetDescriptor[] events =
bi.getEventSetDescriptors();
for(int i = 0; i < events.length; i++) {
System.out.println("Listener type:\n " +
events[i].getListenerType().getName());
Method[] lm =
events[i].getListenerMethods();
for(int j = 0; j < lm.length; j++)
System.out.println(
"Listener method:\n " +
lm[j].getName());
MethodDescriptor[] lmd =
events[i].getListenerMethodDescriptors();
for(int j = 0; j < lmd.length; j++)
System.out.println(
"Method descriptor:\n " +
lmd[j].getMethod().toString());
Method addListener =
events[i].getAddListenerMethod();
System.out.println(
"Add Listener Method:\n " +
addListener.toString());
Method removeListener =
events[i].getRemoveListenerMethod();
System.out.println(
"Remove Listener Method:\n " +
removeListener.toString());
System.out.println("====================");
}
}
// Dump the class of your choice:
public static void main(String[] args) {
if(args.length < 1) {
System.err.println("usage: \n" +
"BeanDumper fully.qualified.class");
System.exit(0);
}
Class c = null;
try {
c = Class.forName(args[0]);
} catch(ClassNotFoundException ex) {
System.err.println(
"Couldn't find " + args[0]);
System.exit(0);
}
dump(c);
}
} ///:~ |