/*
    * 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 javax.el.ELContext;
  import javax.el.ValueExpression;
  import javax.el.ValueReference;
  import javax.faces.context.FacesContext;
  import javax.faces.view.Location;
  
  /**
   * LocationValueExpression for el-api 2.2
   * 
   * @author Jakob Korherr (latest modification by $Author$)
   * @version $Revision$ $Date$
   */
  public class LocationValueExpressionUEL extends LocationValueExpression
  {
  
      private static final long serialVersionUID = 1824869909994211424L;
  
      public LocationValueExpressionUEL()
      {
          super();
      }
      
      public LocationValueExpressionUEL(Location location, ValueExpression delegate)
      {
          super(location, delegate);
      }
      
      public LocationValueExpressionUEL(Location location, ValueExpression delegate, int ccLevel)
      {
          super(location, delegate, ccLevel);
      }
      
      public LocationValueExpression apply(int newCCLevel)
      {
          if(this.ccLevel == newCCLevel)
          {
              return this;
          }
          else
          {
              return new LocationValueExpressionUEL(this.location, this.delegate, newCCLevel);
          }
      }
      
      public LocationValueExpression apply(int newCCLevel, Location newLocation)
      {
          if(this.ccLevel == newCCLevel && this.location.getPath().equals(newLocation.getPath()))
          {
              return this;
          }
          else
          {
              return new LocationValueExpressionUEL(newLocation, this.delegate, newCCLevel);
          }
      }
      
      @Override
      public ValueReference getValueReference(ELContext context)
      {
          FacesContext facesContext = (FacesContext) context.getContext(FacesContext.class);
          CompositeComponentELUtils.saveCompositeComponentForResolver(facesContext, location, ccLevel);
          try
          {
              return delegate.getValueReference(context);
          }
          finally
          {
              CompositeComponentELUtils.removeCompositeComponentForResolver(facesContext);
          }
      }
  
  }