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ByteBuddyMockClassLoader.java
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ByteBuddyMockClassLoader.java
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/*
*
* Copyright 2017 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.powermock.core.classloader.bytebuddy;
import net.bytebuddy.ByteBuddy;
import net.bytebuddy.description.type.TypeDescription;
import net.bytebuddy.description.type.TypeDescription.Generic;
import net.bytebuddy.dynamic.ClassFileLocator.ForClassLoader;
import net.bytebuddy.dynamic.DynamicType.Builder;
import net.bytebuddy.dynamic.loading.ClassLoadingStrategy;
import net.bytebuddy.matcher.ElementMatchers;
import net.bytebuddy.pool.TypePool;
import org.powermock.core.classloader.MockClassLoader;
import org.powermock.core.classloader.MockClassLoaderConfiguration;
import org.powermock.core.transformers.ClassWrapper;
import org.powermock.core.transformers.bytebuddy.support.ByteBuddyClass;
import org.powermock.core.transformers.bytebuddy.support.ByteBuddyClassWrapperFactory;
import java.security.ProtectionDomain;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import static net.bytebuddy.matcher.ElementMatchers.hasMethodName;
public class ByteBuddyMockClassLoader extends MockClassLoader {
private final TypePool typePool;
private final ConcurrentMap<String, Class<?>> definedClasses;
public ByteBuddyMockClassLoader(final String[] classesToMock, final String[] packagesToDefer) {
this(new MockClassLoaderConfiguration(classesToMock, packagesToDefer));
}
public ByteBuddyMockClassLoader(final MockClassLoaderConfiguration configuration) {
super(configuration, new ByteBuddyClassWrapperFactory());
typePool = TypePool.Default.ofClassPath();
definedClasses = new ConcurrentHashMap<String, Class<?>>();
}
@Override
public Class<?> defineClass(final String className, final ProtectionDomain protectionDomain, final byte[] clazz) {
Class<?> defined = definedClasses.get(className);
if (defined == null){
defined = super.defineClass(className, protectionDomain, clazz);
definedClasses.put(className, defined);
}
return defined;
}
protected byte[] defineAndTransformClass(final String name, ProtectionDomain protectionDomain) throws ClassNotFoundException {
TypeDescription typeDefinitions = getTypeDefinitions(name);
loadParentFirst(typeDefinitions);
Builder<Object> builder = createByteBuddyBuilder(typeDefinitions);
ClassWrapper<ByteBuddyClass> wrap = classWrapperFactory.wrap(ByteBuddyClass.from(typeDefinitions, builder));
try {
wrap = transformClass(wrap);
} catch (Exception e) {
throw new IllegalStateException("Failed to transform class with name " + name + ". Reason: " + e.getMessage(), e);
}
return wrap.unwrap().getBuilder()
.make()
.load(this, new MockClassLoadingStrategy(protectionDomain))
.getBytes();
}
private void loadParentFirst(final TypeDescription typeDefinitions) throws ClassNotFoundException {
Generic superClass = typeDefinitions.getSuperClass();
if (parentShouldBeLoaded(typeDefinitions, superClass)) {
loadClass(superClass.getTypeName());
}
}
private boolean parentShouldBeLoaded(final TypeDescription typeDefinitions, final Generic superClass) {
return !typeDefinitions.isInterface() && !typeDefinitions.isEnum() && !"java.lang.Object".equals(superClass.getTypeName());
}
private Builder<Object> createByteBuddyBuilder(final TypeDescription typeDefinitions) {
return new ByteBuddy()
.rebase(
typeDefinitions,
ForClassLoader.ofClassPath()
);
}
private TypeDescription getTypeDefinitions(final String name) throws ClassNotFoundException {
final TypeDescription typeDefinitions;
try {
typeDefinitions = typePool.describe(name).resolve();
} catch (IllegalStateException e) {
throw new ClassNotFoundException(e.getMessage(), e);
}
return typeDefinitions;
}
private class MockClassLoadingStrategy implements ClassLoadingStrategy<ByteBuddyMockClassLoader> {
private final ProtectionDomain protectionDomain;
private MockClassLoadingStrategy(final ProtectionDomain protectionDomain) {
this.protectionDomain = protectionDomain;
}
@Override
public Map<TypeDescription, Class<?>> load(final ByteBuddyMockClassLoader classLoader,
final Map<TypeDescription, byte[]> types) {
final Map<TypeDescription, Class<?>> result = new HashMap<TypeDescription, Class<?>>();
for (Entry<TypeDescription, byte[]> entry : types.entrySet()) {
final TypeDescription typeDescription = entry.getKey();
final Class<?> loaded = defineClass(typeDescription.getName(), protectionDomain, entry.getValue());
result.put(typeDescription, loaded);
}
return result;
}
}
}