/**************************************************************************************
* Copyright (c) Jonas Bon�r, Alexandre Vasseur. All rights reserved. *
* http://aspectwerkz.codehaus.org *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the QPL license *
* a copy of which has been included with this distribution in the license.txt file. *
**************************************************************************************/
package org.codehaus.aspectwerkz.transform;
import org.apache.bcel.generic.ClassGen;
import org.apache.bcel.generic.FieldGen;
import org.apache.bcel.generic.Type;
import org.apache.bcel.Constants;
import org.codehaus.aspectwerkz.definition.AspectWerkzDefinition;
import org.codehaus.aspectwerkz.definition.DefinitionLoader;
import org.codehaus.aspectwerkz.exception.WrappedRuntimeException;
import java.io.IOException;
/**
* Adds a new serialVersionUID to the class (if the class is serializable and does not
* have a UID already defined).
* The calculation is based on the initial bytecode.
* For this transformer, the exclude and include does not matters.
*
* @author <a href="mailto:jboner@codehaus.org">Jonas Bon�r</a>
*/
public class AddSerialVersionUidTransformer implements AspectWerkzInterfaceTransformerComponent {
public AddSerialVersionUidTransformer() {
super();
}
/**
* Adds a serial ver uid to the transformed classes
*
* @param context the transformation context
* @param klass the class weaved
*/
public void transformInterface(final Context context, final Klass klass) {
final ClassGen cg = klass.getClassGen();
if (classFilter(cg)) {
return;
}
if (!TransformationUtil.isSerializable(context, cg)) {
return;
}
if (TransformationUtil.hasSerialVersionUid(cg)) {
return;
}
try {
addSerialVersionUidField(context, cg, klass.getInitialClassGen());
} catch (IOException e) {
throw new WrappedRuntimeException(e);
}
}
/**
* Adds a new serialVersionUID to the class (if the class is serializable and does not
* have a UID already defined).
*
* @param context the transformation context
* @param cg the class gen
* @param initialCg the initial class gen
*/
private void addSerialVersionUidField(final Context context, ClassGen cg, final ClassGen initialCg) {
FieldGen field = new FieldGen(
Constants.ACC_FINAL | Constants.ACC_STATIC,
Type.LONG,
TransformationUtil.SERIAL_VERSION_UID_FIELD,
cg.getConstantPool());
final long uid = TransformationUtil.calculateSerialVersionUid(context, initialCg);
field.setInitValue(uid);
TransformationUtil.addField(cg, field.getField());
}
/**
* Filters the classes to be transformed.
*
* @param cg the class to filter
* @return boolean true if the class should be filtered away
*/
private boolean classFilter(final ClassGen cg) {
if (cg.isInterface()) {
return true;
}
return false;
}
/**
* Callback method. Is being called before each transformation.
*/
public void sessionStart() {
}
/**
* Callback method. Is being called after each transformation.
*/
public void sessionEnd() {
}
/**
* Callback method. Prints a log/status message at each transformation.
*
* @return a log string
*/
public String verboseMessage() {
return this.getClass().getName();
}
}