/*
* Copyright (c) 2007 Mockito contributors
* This program is made available under the terms of the MIT License.
*/
package org.mockito.internal.creation.jmock;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.List;
import net.sf.cglib.core.CodeGenerationException;
import net.sf.cglib.core.DefaultNamingPolicy;
import net.sf.cglib.core.NamingPolicy;
import net.sf.cglib.core.Predicate;
import net.sf.cglib.proxy.Callback;
import net.sf.cglib.proxy.CallbackFilter;
import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.Factory;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.NoOp;
import org.objenesis.ObjenesisStd;
/**
* Thanks to jMock guys for this handy class that wraps all the cglib magic.
*/
public class ClassImposterizer {
public static final ClassImposterizer INSTANCE = new ClassImposterizer();
private ClassImposterizer() {}
private ObjenesisStd objenesis = new ObjenesisStd();
private static final NamingPolicy NAMING_POLICY_THAT_ALLOWS_IMPOSTERISATION_OF_CLASSES_IN_SIGNED_PACKAGES = new DefaultNamingPolicy() {
@Override
public String getClassName(String prefix, String source, Object key, Predicate names) {
return "codegen." + super.getClassName(prefix, source, key, names);
}
};
private static final CallbackFilter IGNORE_BRIDGE_METHODS = new CallbackFilter() {
public int accept(Method method) {
return method.isBridge() ? 1 : 0;
}
};
public boolean canImposterise(Class<?> type) {
return !type.isPrimitive() && !Modifier.isFinal(type.getModifiers()) && !type.isAnonymousClass();
}
public <T> T imposterise(final MethodInterceptor interceptor, Class<T> mockedType, Class<?>... ancilliaryTypes) {
try {
setConstructorsAccessible(mockedType, true);
Class<?> proxyClass = createProxyClass(mockedType);
return mockedType.cast(createProxy(proxyClass, interceptor));
} finally {
setConstructorsAccessible(mockedType, false);
}
}
private void setConstructorsAccessible(Class<?> mockedType, boolean accessible) {
for (Constructor<?> constructor : mockedType.getDeclaredConstructors()) {
constructor.setAccessible(accessible);
}
}
private <T> Class<?> createProxyClass(Class<?> mockedType) {
if (mockedType == Object.class) {
mockedType = ClassWithSuperclassToWorkAroundCglibBug.class;
}
Enhancer enhancer = new Enhancer() {
@Override
@SuppressWarnings("unchecked")
protected void filterConstructors(Class sc, List constructors) {
// Don't filter
}
};
enhancer.setClassLoader(SearchingClassLoader.combineLoadersOf(mockedType));
enhancer.setUseFactory(true);
if (mockedType.isInterface()) {
enhancer.setSuperclass(Object.class);
enhancer.setInterfaces(prepend(mockedType));
} else {
enhancer.setSuperclass(mockedType);
}
enhancer.setCallbackTypes(new Class[]{MethodInterceptor.class, NoOp.class});
enhancer.setCallbackFilter(IGNORE_BRIDGE_METHODS);
if (mockedType.getSigners() != null) {
enhancer.setNamingPolicy(NAMING_POLICY_THAT_ALLOWS_IMPOSTERISATION_OF_CLASSES_IN_SIGNED_PACKAGES);
}
try {
return enhancer.createClass();
} catch (CodeGenerationException e) {
throw new IllegalArgumentException("could not imposterise " + mockedType, e);
}
}
private Object createProxy(Class<?> proxyClass, final MethodInterceptor interceptor) {
Factory proxy = (Factory) objenesis.newInstance(proxyClass);
proxy.setCallbacks(new Callback[] {interceptor, NoOp.INSTANCE});
return proxy;
}
private Class<?>[] prepend(Class<?> first, Class<?>... rest) {
Class<?>[] all = new Class<?>[rest.length+1];
all[0] = first;
System.arraycopy(rest, 0, all, 1, rest.length);
return all;
}
public static class ClassWithSuperclassToWorkAroundCglibBug {}
}