/*
* The Sun Project JXTA(TM) Software License
*
* Copyright (c) 2001-2007 Sun Microsystems, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The end-user documentation included with the redistribution, if any, must
* include the following acknowledgment: "This product includes software
* developed by Sun Microsystems, Inc. for JXTA(TM) technology."
* Alternately, this acknowledgment may appear in the software itself, if
* and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must
* not be used to endorse or promote products derived from this software
* without prior written permission. For written permission, please contact
* Project JXTA at http://www.jxta.org.
*
* 5. Products derived from this software may not be called "JXTA", nor may
* "JXTA" appear in their name, without prior written permission of Sun.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SUN
* MICROSYSTEMS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* JXTA is a registered trademark of Sun Microsystems, Inc. in the United
* States and other countries.
*
* Please see the license information page at :
* <http://www.jxta.org/project/www/license.html> for instructions on use of
* the license in source files.
*
* ====================================================================
* This software consists of voluntary contributions made by many individuals
* on behalf of Project JXTA. For more information on Project JXTA, please see
* http://www.jxta.org.
*
* This license is based on the BSD license adopted by the Apache Foundation.
*/
package net.jxta.impl.content;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import net.jxta.platform.Module;
import net.jxta.service.Service;
/**
* Factory for producing proxy Module objects which ignore the Module
* lifecycle method calls but pass everything else through to the
* underlying Module instance.
*/
public class ModuleWrapperFactory {
/**
* Invocation handler which we will use to ignore Module
* lifecycle methods.
*/
private static class Handler implements InvocationHandler {
/**
* The Module instance backing this proxy.
*/
private final Object instance;
/**
* Constructs a new InvocationHandler with the provided
* backing Module instance.
*
* @param target module instance
*/
public Handler(Module target) {
instance = target;
}
/**
* {@inheritDoc}
*/
public Object invoke(
Object proxy, Method method, Object[] args)
throws Throwable {
if (method.getDeclaringClass().equals(Module.class)) {
// Return something that works when ignoring the call
if ("startApp".equals(method.getName())) {
return Module.START_OK;
} else {
return null;
}
} else {
return method.invoke(instance, args);
}
}
}
/**
* Convenience method for creating proxy objects which implement
* the Module interface and use the provided Module as the backing
* object.
*
* @param module Module instance
* @return new proxy object using module as a backing instance
*/
public static Module newWrapper(Module module) {
return newWrapper(
new Class[] { Module.class },
module);
}
/**
* Convenience method for creating proxy objects which implement
* the Service interface and use the provided Service as the backing
* object.
*
* @param service Service instance
* @return new proxy object using module as a backing instance
*/
public static Service newWrapper(Service service) {
return (Service) newWrapper(
new Class[] { Service.class },
service);
}
/**
* Generic form for creating proxy objects which implement
* the specified list of interfaces and use the provided Module
* as the backing object.
*
* @param interfaces list of interfaces to implement
* @param module Module instance
* @return new proxy object using target as a backing instance
*/
public static Module newWrapper(
Class[] interfaces, Module module) {
Class[] allInterfaces = interfaces;
boolean notFound = true;
for (int i=0; i<interfaces.length && notFound; i++) {
if (interfaces[i].equals(Module.class)) {
notFound = false;
}
}
if (notFound) {
// Add the Module interface to the list, as it is required
allInterfaces = new Class[interfaces.length + 1];
System.arraycopy(
interfaces, 0, allInterfaces, 0, interfaces.length);
allInterfaces[interfaces.length] = Module.class;
}
return (Module) Proxy.newProxyInstance(
module.getClass().getClassLoader(), allInterfaces,
new Handler(module));
}
}