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EasyMock provides an easy way to create Mock Objects for interfaces and classes generating them on the fly
/*
* Copyright 2003 The Apache Software Foundation
*
* 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.easymock.cglib.reflect;
import java.lang.reflect.*;
import org.easymock.cglib.core.*;
import org.easymock.asm.ClassVisitor;
import org.easymock.asm.Type;
/**
* @author Chris Nokleberg
* @version $Id: ConstructorDelegate.java,v 1.20 2006/03/05 02:43:19 herbyderby Exp $
*/
abstract public class ConstructorDelegate {
private static final ConstructorKey KEY_FACTORY =
(ConstructorKey)KeyFactory.create(ConstructorKey.class, KeyFactory.CLASS_BY_NAME);
interface ConstructorKey {
public Object newInstance(String declaring, String iface);
}
protected ConstructorDelegate() {
}
public static ConstructorDelegate create(Class targetClass, Class iface) {
Generator gen = new Generator();
gen.setTargetClass(targetClass);
gen.setInterface(iface);
return gen.create();
}
public static class Generator extends AbstractClassGenerator {
private static final Source SOURCE = new Source(ConstructorDelegate.class.getName());
private static final Type CONSTRUCTOR_DELEGATE =
TypeUtils.parseType("org.easymock.cglib.reflect.ConstructorDelegate");
private Class iface;
private Class targetClass;
public Generator() {
super(SOURCE);
}
public void setInterface(Class iface) {
this.iface = iface;
}
public void setTargetClass(Class targetClass) {
this.targetClass = targetClass;
}
public ConstructorDelegate create() {
setNamePrefix(targetClass.getName());
Object key = KEY_FACTORY.newInstance(iface.getName(), targetClass.getName());
return (ConstructorDelegate)super.create(key);
}
protected ClassLoader getDefaultClassLoader() {
return targetClass.getClassLoader();
}
public void generateClass(ClassVisitor v) {
setNamePrefix(targetClass.getName());
final Method newInstance = ReflectUtils.findNewInstance(iface);
if (!newInstance.getReturnType().isAssignableFrom(targetClass)) {
throw new IllegalArgumentException("incompatible return type");
}
final Constructor constructor;
try {
constructor = targetClass.getDeclaredConstructor(newInstance.getParameterTypes());
} catch (NoSuchMethodException e) {
throw new IllegalArgumentException("interface does not match any known constructor");
}
ClassEmitter ce = new ClassEmitter(v);
ce.begin_class(Constants.V1_2,
Constants.ACC_PUBLIC,
getClassName(),
CONSTRUCTOR_DELEGATE,
new Type[]{ Type.getType(iface) },
Constants.SOURCE_FILE);
Type declaring = Type.getType(constructor.getDeclaringClass());
EmitUtils.null_constructor(ce);
CodeEmitter e = ce.begin_method(Constants.ACC_PUBLIC,
ReflectUtils.getSignature(newInstance),
ReflectUtils.getExceptionTypes(newInstance));
e.new_instance(declaring);
e.dup();
e.load_args();
e.invoke_constructor(declaring, ReflectUtils.getSignature(constructor));
e.return_value();
e.end_method();
ce.end_class();
}
protected Object firstInstance(Class type) {
return ReflectUtils.newInstance(type);
}
protected Object nextInstance(Object instance) {
return instance;
}
}
}