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/*******************************************************************************
* Copyright (c) 2005 Contributors.
* All rights reserved.
* This program and the accompanying materials are made available
* under the terms of the Eclipse Public License v1.0
* which accompanies this distribution and is available at
* http://eclipse.org/legal/epl-v10.html
*
* Contributors:
* Alexandre Vasseur initial implementation
*******************************************************************************/
package org.aspectj.weaver.loadtime;
import java.lang.instrument.Instrumentation;
import java.lang.instrument.ClassFileTransformer;
/**
* Java 1.5 preMain agent to hook in the class pre processor
* Can be used with -javaagent:aspectjweaver.jar
*
* @author Alexandre Vasseur
* @author Alexander Kriegisch
*/
public class Agent {
/**
* The instrumentation instance
*/
private static Instrumentation s_instrumentation;
/**
* The ClassFileTransformer wrapping the weaver
*/
private static ClassFileTransformer s_transformer = new ClassPreProcessorAgentAdapter();
/**
* JSR-163 preMain Agent entry method
*
* @param options
* @param instrumentation
*/
public static void premain(String options, Instrumentation instrumentation) {
/* Handle duplicate agents */
if (s_instrumentation != null) {
return;
}
s_instrumentation = instrumentation;
s_instrumentation.addTransformer(s_transformer);
}
public static void agentmain(String options, Instrumentation instrumentation) {
premain(options, instrumentation);
}
/**
* Returns the Instrumentation system level instance
*/
public static Instrumentation getInstrumentation() {
if (s_instrumentation == null) {
throw new UnsupportedOperationException(
"AspectJ weaving agent was neither started via '-javaagent' (preMain) " +
"nor attached via 'VirtualMachine.loadAgent' (agentMain)");
}
return s_instrumentation;
}
}
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