/*
* Copyright 2004-2015 the Seasar Foundation and the Others.
*
* 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.seasar.framework.aop.interceptors;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.seasar.framework.beans.BeanDesc;
import org.seasar.framework.beans.MethodNotFoundRuntimeException;
import org.seasar.framework.beans.factory.BeanDescFactory;
import org.seasar.framework.exception.EmptyRuntimeException;
import org.seasar.framework.util.MethodUtil;
/**
* あるオブジェクトへの呼び出しを別のオブジェクトに転送する{@link MethodInterceptor}です。
*
* @author higa
*
*/
public class DelegateInterceptor extends AbstractInterceptor {
private static final long serialVersionUID = 3613140488663554089L;
private Object target;
private BeanDesc beanDesc;
private Map methodNameMap = new HashMap();
/**
* {@link DelegateInterceptor}を作成します。
*/
public DelegateInterceptor() {
}
/**
* {@link DelegateInterceptor}を作成します。
*
* @param target
*/
public DelegateInterceptor(Object target) {
setTarget(target);
}
/**
* ターゲットのオブジェクトを返します。
*
* @return target
*/
public Object getTarget() {
return target;
}
/**
* ターゲットのオブジェクトを設定します。
*
* @param target
*/
public void setTarget(Object target) {
this.target = target;
beanDesc = BeanDescFactory.getBeanDesc(target.getClass());
}
/**
* 転送するメソッドの組を追加します。
*
* @param methodName
* @param targetMethodName
*/
public void addMethodNameMap(String methodName, String targetMethodName) {
methodNameMap.put(methodName, targetMethodName);
}
/**
* @see org.aopalliance.intercept.MethodInterceptor#invoke(org.aopalliance.intercept.MethodInvocation)
*/
public Object invoke(MethodInvocation invocation) throws Throwable {
if (target == null) {
throw new EmptyRuntimeException("target");
}
Method method = invocation.getMethod();
String methodName = method.getName();
if (methodNameMap.containsKey(methodName)) {
methodName = (String) methodNameMap.get(methodName);
}
if (!MethodUtil.isAbstract(method)) {
return invocation.proceed();
} else if (beanDesc.hasMethod(methodName)) {
return beanDesc.invoke(target, methodName, invocation
.getArguments());
} else {
throw new MethodNotFoundRuntimeException(
getTargetClass(invocation), methodName, invocation
.getArguments());
}
}
}