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Dynamically load a Java Agent or acquire java.lang.instrument.Instrumentation via SPI
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/*-
 * #%L
 * io.earcam.instrumental.agent
 * %%
 * Copyright (C) 2018 earcam
 * %%
 * SPDX-License-Identifier: (BSD-3-Clause OR EPL-1.0 OR Apache-2.0 OR MIT)
 * 
 * You must choose to accept, in full - any individual or combination of 
 * the following licenses:
 * 
 * 	BSD-3-Clause
 * 	EPL-1.0
 * 	Apache-2.0
 * 	MIT
 * 
 * #L%
 */
package io.earcam.instrumental.agent;

import java.lang.instrument.ClassDefinition;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.Instrumentation;
import java.lang.instrument.UnmodifiableClassException;
import java.util.jar.JarFile;

/**
 * 
 * InstrumentationWrapper class.
 * 
 *
 */
public class InstrumentationWrapper implements Instrumentation {

	private volatile Instrumentation delegate;


	/**
	 * 
	 * Setter for the field delegate.
	 * 
	 *
	 * @param delegate a {@link java.lang.instrument.Instrumentation} object.
	 */
	protected void setDelegate(Instrumentation delegate)
	{
		this.delegate = delegate;
	}


	/**
	 * 
	 * Getter for the field delegate.
	 * 
	 *
	 * @return a {@link java.lang.instrument.Instrumentation} object.
	 */
	protected Instrumentation getDelegate()
	{
		return delegate;
	}


	@Override
	public void addTransformer(ClassFileTransformer transformer, boolean canRetransform)
	{
		delegate.addTransformer(transformer, canRetransform);
	}


	@Override
	public void addTransformer(ClassFileTransformer transformer)
	{
		delegate.addTransformer(transformer);
	}


	@Override
	public boolean removeTransformer(ClassFileTransformer transformer)
	{
		return delegate.removeTransformer(transformer);
	}


	@Override
	public boolean isRetransformClassesSupported()
	{
		return delegate.isRetransformClassesSupported();
	}


	@Override
	public void retransformClasses(Class... classes) throws UnmodifiableClassException
	{
		delegate.retransformClasses(classes);
	}


	@Override
	public boolean isRedefineClassesSupported()
	{
		return delegate.isRedefineClassesSupported();
	}


	@Override
	public void redefineClasses(ClassDefinition... definitions) throws ClassNotFoundException, UnmodifiableClassException
	{
		delegate.redefineClasses(definitions);
	}


	@Override
	public boolean isModifiableClass(Class theClass)
	{
		return delegate.isModifiableClass(theClass);
	}


	@Override
	public Class[] getAllLoadedClasses()
	{
		return delegate.getAllLoadedClasses();
	}


	@Override
	public Class[] getInitiatedClasses(ClassLoader loader)
	{
		return delegate.getInitiatedClasses(loader);
	}


	@Override
	public long getObjectSize(Object objectToSize)
	{
		return delegate.getObjectSize(objectToSize);
	}


	@Override
	public void appendToBootstrapClassLoaderSearch(JarFile jarfile)
	{
		delegate.appendToBootstrapClassLoaderSearch(jarfile);
	}


	@Override
	public void appendToSystemClassLoaderSearch(JarFile jarfile)
	{
		delegate.appendToSystemClassLoaderSearch(jarfile);
	}


	@Override
	public boolean isNativeMethodPrefixSupported()
	{
		return delegate.isNativeMethodPrefixSupported();
	}


	@Override
	public void setNativeMethodPrefix(ClassFileTransformer transformer, String prefix)
	{
		delegate.setNativeMethodPrefix(transformer, prefix);
	}

}