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/**********************************************************************
* This file is part of the "Object Teams Runtime Environment"
*
* Copyright 2009 Stephan Herrmann
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
* $Id: LowerableTransformation.java 23408 2010-02-03 18:07:35Z stephan $
*
* Please visit http://www.objectteams.org for updates and contact.
*
* Contributors:
* Stephan Herrmann - Initial API and implementation
**********************************************************************/
package org.eclipse.objectteams.otre;
import java.util.HashSet;
import java.util.Set;
import org.apache.bcel.Constants;
import org.apache.bcel.generic.ClassGen;
import org.apache.bcel.generic.MethodGen;
import org.apache.bcel.generic.Type;
/**
* This transformer helps legacy class files pre 1.3.2 to cope with changes re ILowerable.lower().
*
* @author stephan
* @since 1.3.2
*/
public class LowerableTransformation extends ObjectTeamsTransformation {
// static because checking is performed without instance context (from scanClassOTAttribrutes)
// using ClassGen rather than names should, however, avoid conflicts between different class loaders etc.
static Set<ClassGen> transformationRequests = new HashSet<ClassGen>();
public LowerableTransformation(SharedState state) { this(null, state); }
public LowerableTransformation(ClassLoader loader, SharedState state) {
super(loader, state);
}
public void doTransformInterface(ClassEnhancer ce, ClassGen cg) {
synchronized (transformationRequests) {
if (!transformationRequests.remove(cg))
return;
}
// yes, a change was requested, add method "public abstract Object lower();"
MethodGen lower = new MethodGen(Constants.ACC_PUBLIC|Constants.ACC_ABSTRACT, object, new Type[0], new String[0], "lower", cg.getClassName(), null, cg.getConstantPool());
ce.addMethod(lower.getMethod(), cg);
}
/** After reading the compiler version of a class file, check if this class is affected by the change. */
public static void checkRequiresAdaptation(int major, int minor, int revision, ClassGen cg) {
// only 1.3.1 and below:
if (major > 1) return;
if (major == 1 && minor > 3) return;
if (major == 1 && minor == 3 && revision > 1) return;
// only interfaces ...
if (!cg.isInterface()) return;
// ... implementing ILowerabel:
for (String superInterface : cg.getInterfaceNames()) {
if ("org.objectteams.Team$ILowerable".equals(superInterface))
synchronized(transformationRequests) {
transformationRequests.add(cg);
return;
}
}
}
}
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