/*

  * 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.el.convert;

 import javax.el.ELException;

 import javax.el.ELResolver;

 import javax.el.PropertyNotFoundException;

 import javax.faces.context.FacesContext;

 import javax.faces.el.EvaluationException;

 import javax.faces.el.VariableResolver;

 /**

  * Provides ELResolver wrapper so that legacy apps which rely on a VariableResolver can still work.

  * 

  * @author Stan Silvert

  */

 public final class ELResolverToVariableResolver extends VariableResolver

 {

     private final ELResolver elResolver;

     /**

      * Creates a new instance of ELResolverToVariableResolver

      */

     public ELResolverToVariableResolver(final ELResolver elResolver)

     {

         if (elResolver == null)

         {

             throw new NullPointerException();

         }

         this.elResolver = elResolver;

     }

     @Override

     public Object resolveVariable(final FacesContext facesContext, final String name) throws EvaluationException

     {

         try

         {

             return elResolver.getValue(facesContext.getELContext(), null, name);

         }

         catch (PropertyNotFoundException e)

         {

             throw new EvaluationException(e);

         }

         catch (ELException e)

         {

             throw new EvaluationException(e);

         }

     }

 }