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Posted to cvs@avalon.apache.org by do...@apache.org on 2002/04/07 04:38:39 UTC
cvs commit: jakarta-avalon-excalibur/util/src/java/org/apache/avalon/excalibur/proxy DynamicProxy.java package.html
donaldp 02/04/06 18:38:39
Added: util/src/java/org/apache/avalon/excalibur/proxy
DynamicProxy.java package.html
Log:
One class does not a component make. Rolled the Proxy stuff into the util package
Revision Changes Path
1.1 jakarta-avalon-excalibur/util/src/java/org/apache/avalon/excalibur/proxy/DynamicProxy.java
Index: DynamicProxy.java
===================================================================
/*
* Copyright (C) The Apache Software Foundation. All rights reserved.
*
* This software is published under the terms of the Apache Software License
* version 1.1, a copy of which has been included with this distribution in
* the LICENSE.txt file.
*/
package org.apache.avalon.excalibur.proxy;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
/**
* This makes a dynamic proxy for an object. The object can be represented
* by one, some of all of it's interfaces.
*
* Amongst other things, it's an anti hackinge measure. Suitable armed code
* could have case an interface for a thing back to it's impl and used methods
* and properties that were not it's authors intention. Reflection too allows
* some powerful introspection things and some traversal even more things
* including private member vars by a serialisation trick... hence the transient.
*
*
* @author <a href="mailto:peter@apache.org">Peter Donald</a>
* @author <a href="mailto:Paul_Hammant@yahoo.com">Paul Hammant</a>
* @version CVS $Revision: 1.1 $ $Date: 2002/04/07 02:38:39 $
* @since 4.0b5
*/
public final class DynamicProxy
implements InvocationHandler
{
private transient Object m_object;
/**
* Private constructor that blocks instantiation outside this class.
*
* @param object the underlying object
*/
private DynamicProxy( final Object object )
{
m_object = object;
}
/**
* Create a proxy object that has all of it's underlying
* interfaces implemented by proxy.
*
* @param object the underling object to proxy
* @return the proxied object
*/
public static Object newInstance( final Object object )
{
return newInstance( object, object.getClass().getInterfaces() );
}
/**
* Create a proxy object that has specified interfaces implemented by proxy.
*
* @param object the underling object to proxy
* @return the proxied object
*/
public static Object newInstance( final Object object, final Class[] interfaces )
{
final ClassLoader classLoader = object.getClass().getClassLoader();
final DynamicProxy proxy = new DynamicProxy( object );
return Proxy.newProxyInstance( classLoader, interfaces, proxy );
}
/**
* Invoke the specified method on underlying object.
* This is called by proxy object.
*
* @param proxy the proxy object
* @param method the method invoked on proxy object
* @param args the arguments supplied to method
* @return the return value of method
* @exception Throwable if an error occurs
*/
public Object invoke( final Object proxy,
final Method method,
final Object[] args )
throws Throwable
{
try
{
return method.invoke( m_object, args );
}
catch( final InvocationTargetException ite )
{
throw ite.getTargetException();
}
}
}
1.1 jakarta-avalon-excalibur/util/src/java/org/apache/avalon/excalibur/proxy/package.html
Index: package.html
===================================================================
<html>
<body>
Dynamic proxy generation utility.
</body>
</html>
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