/*

  * 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.flow;

 import javax.el.ValueExpression;

 import javax.faces.context.FacesContext;

 import javax.faces.flow.ReturnNode;

 /**

  *

  * @since 2.2

  * @author Leonardo Uribe

  */

 public class ReturnNodeImpl extends ReturnNode implements Freezable

 {

     private String _fromOutcome;

     private ValueExpression _fromOutcomeEL;

     private String _id;

     private boolean _initialized;

     public ReturnNodeImpl(String returnNodeId)

     {

         this._id = returnNodeId;

     }

     @Override

     public String getFromOutcome(FacesContext context)

     {

         if (_fromOutcomeEL != null)

         {

             return (String) _fromOutcomeEL.getValue(context.getELContext());

         }

         return _fromOutcome;

     }

     @Override

     public String getId()

     {

         return _id;

     }

     public void freeze()

     {

         _initialized = true;

     }

     private void checkInitialized() throws IllegalStateException

     {

         if (_initialized)

         {

             throw new IllegalStateException("Flow is inmutable once initialized");

         }

     }

     public void setFromOutcome(String fromOutcome)

     {

         checkInitialized();

         this._fromOutcome = fromOutcome;

         this._fromOutcomeEL = null;

     }

     public void setFromOutcome(ValueExpression fromOutcome)

     {

         checkInitialized();

         this._fromOutcomeEL = fromOutcome;

         this._fromOutcome = null;

     }

     public void setId(String id)

     {

         checkInitialized();

         this._id = id;

     }

 }