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EasyMock provides an easy way to create Mock Objects for interfaces and classes generating them on the fly
/*
* Copyright 2003,2004 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.beans;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import org.easymock.cglib.core.*;
import org.easymock.asm.ClassVisitor;
import org.easymock.asm.Type;
/**
* @author Chris Nokleberg
*/
public class ImmutableBean
{
private static final Type ILLEGAL_STATE_EXCEPTION =
TypeUtils.parseType("IllegalStateException");
private static final Signature CSTRUCT_OBJECT =
TypeUtils.parseConstructor("Object");
private static final Class[] OBJECT_CLASSES = { Object.class };
private static final String FIELD_NAME = "CGLIB$RWBean";
private ImmutableBean() {
}
public static Object create(Object bean) {
Generator gen = new Generator();
gen.setBean(bean);
return gen.create();
}
public static class Generator extends AbstractClassGenerator {
private static final Source SOURCE = new Source(ImmutableBean.class.getName());
private Object bean;
private Class target;
public Generator() {
super(SOURCE);
}
public void setBean(Object bean) {
this.bean = bean;
target = bean.getClass();
}
protected ClassLoader getDefaultClassLoader() {
return target.getClassLoader();
}
public Object create() {
String name = target.getName();
setNamePrefix(name);
return super.create(name);
}
public void generateClass(ClassVisitor v) {
Type targetType = Type.getType(target);
ClassEmitter ce = new ClassEmitter(v);
ce.begin_class(Constants.V1_2,
Constants.ACC_PUBLIC,
getClassName(),
targetType,
null,
Constants.SOURCE_FILE);
ce.declare_field(Constants.ACC_FINAL | Constants.ACC_PRIVATE, FIELD_NAME, targetType, null);
CodeEmitter e = ce.begin_method(Constants.ACC_PUBLIC, CSTRUCT_OBJECT, null);
e.load_this();
e.super_invoke_constructor();
e.load_this();
e.load_arg(0);
e.checkcast(targetType);
e.putfield(FIELD_NAME);
e.return_value();
e.end_method();
PropertyDescriptor[] descriptors = ReflectUtils.getBeanProperties(target);
Method[] getters = ReflectUtils.getPropertyMethods(descriptors, true, false);
Method[] setters = ReflectUtils.getPropertyMethods(descriptors, false, true);
for (int i = 0; i < getters.length; i++) {
MethodInfo getter = ReflectUtils.getMethodInfo(getters[i]);
e = EmitUtils.begin_method(ce, getter, Constants.ACC_PUBLIC);
e.load_this();
e.getfield(FIELD_NAME);
e.invoke(getter);
e.return_value();
e.end_method();
}
for (int i = 0; i < setters.length; i++) {
MethodInfo setter = ReflectUtils.getMethodInfo(setters[i]);
e = EmitUtils.begin_method(ce, setter, Constants.ACC_PUBLIC);
e.throw_exception(ILLEGAL_STATE_EXCEPTION, "Bean is immutable");
e.end_method();
}
ce.end_class();
}
protected Object firstInstance(Class type) {
return ReflectUtils.newInstance(type, OBJECT_CLASSES, new Object[]{ bean });
}
// TODO: optimize
protected Object nextInstance(Object instance) {
return firstInstance(instance.getClass());
}
}
}