/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
* C E D A R
* S O L U T I O N S "Software done right."
* S O F T W A R E
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
* Copyright (c) 2013 Kenneth J. Pronovici.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the Apache License, Version 2.0.
* See LICENSE for more information about the licensing terms.
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
* Author : Kenneth J. Pronovici <pronovic@ieee.org>
* Language : Java 6
* Project : Common Java Functionality
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
package com.cedarsolutions.junit.gwt.classloader;
import javassist.ClassPool;
import javassist.Loader;
import com.cedarsolutions.exception.CedarRuntimeException;
/**
* Specialized class loader used for stubbed GWT client tests.
*
* <p>
* This works through the magic of Javassist. Basically, we create a new
* classloader that applies specific translations to certain classes.
* </p>
*
* <p>
* This class was derived in part from source code in gwt-test-utils. See
* README.credits for more information.
* </p>
*
* @author Kenneth J. Pronovici <pronovic@ieee.org>
*/
public class GwtClassLoader extends Loader {
private static final GwtClassLoader INSTANCE = new GwtClassLoader(ClassPool.getDefault());
private GwtClassLoader(ClassPool classPool) {
super(classPool);
handleDelegatedClasses();
addTranslators(classPool);
}
public static synchronized GwtClassLoader get() {
Thread.currentThread().setContextClassLoader(INSTANCE);
return INSTANCE;
}
public static void reset() {
Thread.currentThread().setContextClassLoader(INSTANCE.getParent());
}
private void addTranslators(ClassPool classPool) {
try {
addTranslator(classPool, new GwtCreateTranslator());
} catch (Exception e) {
throw new CedarRuntimeException("Error adding translator: " + e.getMessage(), e);
}
}
private void handleDelegatedClasses() {
// This list was originally derived from the gwt-test-utils.properties file.
// It should eventually be made configurable, I think. For now, I'm just going
// to leave it and see what problems I find.
delegateLoadingOf("javassist.");
delegateLoadingOf("org.aopalliance.");
delegateLoadingOf("org.junit.");
delegateLoadingOf("org.apache.");
delegateLoadingOf("com.cedarsolutions.util.junit.gwt.classloader.GwtClassLoader");
delegateLoadingOf("org.springframework.");
}
}