/*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you 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.apache.myfaces.view.facelets.el;

 import java.lang.reflect.Method;

 import javax.el.FunctionMapper;

 /**

  * Composite FunctionMapper that attempts to load the Method from the first FunctionMapper, then the second if

  * <code>null</code>.

  * 

  * @see javax.el.FunctionMapper

  * @see java.lang.reflect.Method

  * 

  * @author Jacob Hookom

  * @version $Id$

  */

 public final class CompositeFunctionMapper extends FunctionMapper

 {

     private final FunctionMapper fn0;

     private final FunctionMapper fn1;

     public CompositeFunctionMapper(FunctionMapper fn0, FunctionMapper fn1)

     {

         this.fn0 = fn0;

         this.fn1 = fn1; // this one can be null

     }

     /**

      * @see javax.el.FunctionMapper#resolveFunction(java.lang.String, java.lang.String)

      */

     public Method resolveFunction(String prefix, String name)

     {

         Method m = this.fn0.resolveFunction(prefix, name);

         if (m == null && this.fn1 != null)

         {

             return this.fn1.resolveFunction(prefix, name);

         }

         return m;

     }

 }