/*

  * 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 java.util.ArrayList;

 import java.util.Collections;

 import java.util.List;

 import javax.el.MethodExpression;

 import javax.el.ValueExpression;

 import javax.faces.flow.MethodCallNode;

 import javax.faces.flow.Parameter;

 /**

  *

  * @since 2.2

  * @author Leonardo Uribe

  */

 public class MethodCallNodeImpl extends MethodCallNode implements Freezable

 {

     private String _id;

     private MethodExpression _methodExpression;

     private ValueExpression _outcome;

     private List<Parameter> _parameters;

     private List<Parameter> _unmodifiableParameters;

     private boolean _initialized;

     public MethodCallNodeImpl(String methodCallNodeId)

     {

         this._id = methodCallNodeId;

         _parameters = new ArrayList<Parameter>();

         _unmodifiableParameters = Collections.unmodifiableList(_parameters);

     }

     @Override

     public MethodExpression getMethodExpression()

     {

         return _methodExpression;

     }

     @Override

     public ValueExpression getOutcome()

     {

         return _outcome;

     }

     @Override

     public List<Parameter> getParameters()

     {

         return _unmodifiableParameters;

     }

     public void addParameter(Parameter parameter)

     {

         checkInitialized();

         _parameters.add(parameter);

     }

     @Override

     public String getId()

     {

         return _id;

     }

     public void freeze()

     {

         _initialized = true;

         for (Parameter value : _parameters)

         {

             if (value instanceof Freezable)

             {

                 ((Freezable)value).freeze();

             }

         }

     }

     private void checkInitialized() throws IllegalStateException

     {

         if (_initialized)

         {

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

         }

     }

     public void setMethodExpression(MethodExpression methodExpression)

     {

         checkInitialized();

         this._methodExpression = methodExpression;

     }

     public void setOutcome(ValueExpression outcome)

     {

         checkInitialized();

         this._outcome = outcome;

     }

     public void setId(String id)

     {

         checkInitialized();

         this._id = id;

     }

 }