/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008-2011, Red Hat Inc. or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Inc.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.bytecode.spi;

import java.security.ProtectionDomain;

import org.hibernate.bytecode.buildtime.spi.ClassFilter;
import org.hibernate.bytecode.buildtime.spi.FieldFilter;

Basic implementation of the ClassTransformer contract. 
Author:
Emmanuel Bernard, Steve Ebersole/**
 * Basic implementation of the {@link ClassTransformer} contract.
 *
 * @author Emmanuel Bernard
 * @author Steve Ebersole
 */
public abstract class AbstractClassTransformerImpl implements ClassTransformer {
	protected final ClassFilter classFilter;
	protected final FieldFilter fieldFilter;

	protected AbstractClassTransformerImpl(ClassFilter classFilter, FieldFilter fieldFilter) {
		this.classFilter = classFilter;
		this.fieldFilter = fieldFilter;
	}

	@Override
	public byte[] transform(
			ClassLoader loader,
			String className,
			Class classBeingRedefined,
			ProtectionDomain protectionDomain,
			byte[] classfileBuffer) {
		// to be safe...
		className = className.replace( '/', '.' );
		if ( classFilter.shouldInstrumentClass( className ) ) {
			return doTransform( loader, className, classBeingRedefined, protectionDomain, classfileBuffer );
		}
		else {
			return classfileBuffer;
		}
	}

	
Delegate the transformation call from transform 
Params:
loader – The class loader to use
className – The name of the class to transform
classBeingRedefined – If an already loaded class is being redefined, then pass this as a parameter
protectionDomain – The protection domain of the class being (re)defined
classfileBuffer – The bytes of the class file.
Returns:
The transformed (enhanced/instrumented) bytes./**
	 * Delegate the transformation call from {@link #transform}
	 *
	 * @param loader The class loader to use
	 * @param className The name of the class to transform
	 * @param classBeingRedefined If an already loaded class is being redefined, then pass this as a parameter
	 * @param protectionDomain The protection domain of the class being (re)defined
	 * @param classfileBuffer The bytes of the class file.
	 *
	 * @return The transformed (enhanced/instrumented) bytes.
	 */
	protected abstract byte[] doTransform(
			ClassLoader loader,
			String className,
			Class classBeingRedefined,
			ProtectionDomain protectionDomain,
			byte[] classfileBuffer);
}