/*
    * 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.SwitchCase;
  
  /**
   *
   * @since 2.2
   * @author Leonardo Uribe
   */
  public class SwitchCaseImpl extends SwitchCase implements Freezable
  {
      private String _fromOutcome;
      
      private Boolean _condition;
      private ValueExpression _conditionEL;
  
      private boolean _initialized;
  
      @Override
      public String getFromOutcome()
      {
          return _fromOutcome;
      }
  
      @Override
      public Boolean getCondition(FacesContext context)
      {
          if (_conditionEL != null)
          {
              Object value = _conditionEL.getValue(context.getELContext());
              if (value instanceof String)
              {
                  return Boolean.valueOf((String) value);
              }
              return (Boolean) value;
          }
          return _condition;
      }
      
      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;
      }
  
      public void setCondition(Boolean condition)
      {
          checkInitialized();
          this._condition = condition;
          this._conditionEL = null;
      }
  
      public void setCondition(ValueExpression conditionEL)
      {
          checkInitialized();
          this._conditionEL = conditionEL;
          this._condition = null;
      }
  }