/*

  * Copyright 2004-2008 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.uruma.binding.method.impl;

 import java.lang.reflect.Method;

 import org.seasar.uruma.binding.method.ArgumentsFilter;

 /**

  * ターゲットメソッドの引数よりも数が多い場合に切り捨てを行う {@link ArgumentsFilter} です。<br />

  * 

  * @author bskuroneko

  */

 public class OmissionArgumentsFilter implements ArgumentsFilter {

     private int targetParameterLength;

     /**

      * {@link OmissionArgumentsFilter} を構築します。<br />

      * 

      * @param targetMethod

      *            ターゲットメソッド

      */

     public OmissionArgumentsFilter(final Method targetMethod) {

         this.targetParameterLength = targetMethod.getParameterTypes().length;

     }

     /*

      * @see org.seasar.uruma.binding.method.ArgumentsFilter#filter(java.lang.Object[])

      */

     public Object[] filter(final Object[] args) {

         if (args == null) {

             return null;

         }

         if (targetParameterLength >= args.length) {

             return args;

         }

         Object[] adjustArgs = new Object[targetParameterLength];

         System.arraycopy(args, 0, adjustArgs, 0, adjustArgs.length);

         return adjustArgs;

     }

 }