//$Id: $
package org.hibernate.bytecode;

import org.hibernate.bytecode.util.ClassFilter;
import org.hibernate.bytecode.util.FieldFilter;

import java.security.ProtectionDomain;

/**
 * @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;
	}

	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;
		}
	}

	protected abstract byte[] doTransform(
			ClassLoader loader,
			String className,
			Class classBeingRedefined,
			ProtectionDomain protectionDomain,
			byte[] classfileBuffer);
}