/*
 * #%L
 * ImageJ software for multidimensional image processing and analysis.
 * %%
 * Copyright (C) 2009 - 2013 Board of Regents of the University of
 * Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
 * Institute of Molecular Cell Biology and Genetics.
 * %%
 * 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.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS 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 THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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package imagej.legacy;

import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.IllegalClassFormatException;
import java.lang.instrument.Instrumentation;
import java.security.ProtectionDomain;

/**
 * A Java agent to help with legacy issues.
 * 
 * @author Johannes Schindelin
 */
public class LegacyJavaAgent implements ClassFileTransformer {
	public static void premain(final String agentArgs, final Instrumentation instrumentation) {
		System.err.println("The legacy agent was started with the argument: " + agentArgs);
		instrumentation.addTransformer(new LegacyJavaAgent());
	}

	@Override
	public byte[] transform(ClassLoader loader, String className,
			Class<?> classBeingRedefined, ProtectionDomain protectionDomain,
			byte[] classfileBuffer) throws IllegalClassFormatException {
		if (className.startsWith("ij.") || className.startsWith("ij/")) {
			System.err.println("Loading " + className + " into " + loader + "!");
			Thread.dumpStack();
		}
		return null;
	}
}

Add a simple Java agent to identify when ImageJ 1.x classes are loaded
Add a simple Java agent to identify when ImageJ 1.x classes are loaded

When ImageJ 1.x' classes are loaded before the ij-legacy patching had
a chance, we have a problem. The biggest problem is that we only have
a chance to detect that situation when the ij-legacy patching takes
place, so there is no way to know which code path loaded the unpatched
ImageJ 1.x classes.

To help with that, this commit adds a Java agent that reports whenever
classes in the "ij" package (or any of its nested packages) is loaded.

We will refine this agent in subsequent commits.

Signed-off-by: Johannes Schindelin <53fb8db7833fca1e1746dd8592f61048d350f64c@gmx.de>
