/*
* Copyright 2002-2006 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.instrument.classloading;
import static org.junit.Assert.*;
import java.lang.instrument.ClassFileTransformer;
import java.security.ProtectionDomain;
import org.junit.Test;
/**
* Unit tests for the {@link ReflectiveLoadTimeWeaver} class.
*
* @author Rick Evans
* @author Chris Beams
*/
public final class ReflectiveLoadTimeWeaverTests {
@Test(expected=IllegalArgumentException.class)
public void testCtorWithNullClassLoader() {
new ReflectiveLoadTimeWeaver(null);
}
@Test(expected=IllegalStateException.class)
public void testCtorWithClassLoaderThatDoesNotExposeAnAddTransformerMethod() {
new ReflectiveLoadTimeWeaver(getClass().getClassLoader());
}
@Test
public void testCtorWithClassLoaderThatDoesNotExposeAGetThrowawayClassLoaderMethodIsOkay() {
JustAddTransformerClassLoader classLoader = new JustAddTransformerClassLoader();
ReflectiveLoadTimeWeaver weaver = new ReflectiveLoadTimeWeaver(classLoader);
weaver.addTransformer(new ClassFileTransformer() {
public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) {
return "CAFEDEAD".getBytes();
}
});
assertEquals(1, classLoader.getNumTimesGetThrowawayClassLoaderCalled());
}
@Test(expected=IllegalArgumentException.class)
public void testAddTransformerWithNullTransformer() {
new ReflectiveLoadTimeWeaver(new JustAddTransformerClassLoader()).addTransformer(null);
}
@Test
public void testGetThrowawayClassLoaderWithClassLoaderThatDoesNotExposeAGetThrowawayClassLoaderMethodYieldsFallbackClassLoader() {
ReflectiveLoadTimeWeaver weaver = new ReflectiveLoadTimeWeaver(new JustAddTransformerClassLoader());
ClassLoader throwawayClassLoader = weaver.getThrowawayClassLoader();
assertNotNull(throwawayClassLoader);
}
@Test
public void testGetThrowawayClassLoaderWithTotallyCompliantClassLoader() {
TotallyCompliantClassLoader classLoader = new TotallyCompliantClassLoader();
ReflectiveLoadTimeWeaver weaver = new ReflectiveLoadTimeWeaver(classLoader);
ClassLoader throwawayClassLoader = weaver.getThrowawayClassLoader();
assertNotNull(throwawayClassLoader);
assertEquals(1, classLoader.getNumTimesGetThrowawayClassLoaderCalled());
}
public static class JustAddTransformerClassLoader extends ClassLoader {
private int numTimesAddTransformerCalled = 0;
public int getNumTimesGetThrowawayClassLoaderCalled() {
return this.numTimesAddTransformerCalled;
}
public void addTransformer(ClassFileTransformer transformer) {
++this.numTimesAddTransformerCalled;
}
}
public static final class TotallyCompliantClassLoader extends JustAddTransformerClassLoader {
private int numTimesGetThrowawayClassLoaderCalled = 0;
public int getNumTimesGetThrowawayClassLoaderCalled() {
return this.numTimesGetThrowawayClassLoaderCalled;
}
public ClassLoader getThrowawayClassLoader() {
++this.numTimesGetThrowawayClassLoaderCalled;
return getClass().getClassLoader();
}
}
}