Package org.dozer.functional_tests.proxied

Source Code of org.dozer.functional_tests.proxied.ProxyDataObjectInstantiator$NoOpInterceptor

package org.dozer.functional_tests.proxied;

import java.io.Serializable;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

import org.dozer.functional_tests.DataObjectInstantiator;
import org.dozer.util.MappingUtils;

import net.sf.cglib.proxy.Dispatcher;
import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;

/*
* Copyright 2005-2010 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.
*/

/**
* Quick and dirty class used to create test data objects that are wrapped with a proxy.  Right now use CGLIB to proxy
* the data objects since this is probably the most typical usage of proxied data objects(Hibernate lazy loading).
*
* @author Matt Tierney
*/
public class ProxyDataObjectInstantiator implements DataObjectInstantiator {

  public static final ProxyDataObjectInstantiator INSTANCE = new ProxyDataObjectInstantiator();

  private ProxyDataObjectInstantiator() {
  }

  public <T> T newInstance(Class<T> classToInstantiate) {
    Enhancer enhancer = new Enhancer();
    enhancer.setSuperclass(classToInstantiate);
    enhancer.setCallback(NoOpInterceptor.INSTANCE);
    return (T) enhancer.create();
  }
 
  public <T> T newInstance(Class<T> classToInstantiate, Object[] args) {
    List<Class<?>> argTypes = new ArrayList<Class<?>>();
    for (Object arg : args) {
      argTypes.add(MappingUtils.getRealClass(arg.getClass()));
    }
    Enhancer enhancer = new Enhancer();
    enhancer.setSuperclass(classToInstantiate);
    enhancer.setCallback(NoOpInterceptor.INSTANCE);
    return (T) enhancer.create(argTypes.toArray(new Class[0]), args);
  }

  public Object newInstance(Class<?>[] interfacesToProxy, final Object target) {
    Enhancer enhancer = new Enhancer();
    enhancer.setInterfaces(interfacesToProxy);
    enhancer.setCallback(new Dispatcher() {
      public Object loadObject() throws Exception {
        return target;
      }
    });
    return enhancer.create();
  }

  private static class NoOpInterceptor implements MethodInterceptor, Serializable {
    private static final NoOpInterceptor INSTANCE = new NoOpInterceptor();

    public Object intercept(Object object, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
      return methodProxy.invokeSuper(object, args);
    }
  }

}
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