/*

  * 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.tag.jstl.core;

 import java.io.Serializable;

 import java.util.Map;

 import javax.el.ELContext;

 import javax.el.ValueExpression;

 /**

  * @author Jacob Hookom

  * @version $Id$

  */

 public final class MappedValueExpression extends ValueExpression

 {

     private final static class Entry implements Map.Entry, Serializable

     {

         private final Map src;

         private final Object key;

         public Entry(Map src, Object key)

         {

             this.src = src;

             this.key = key;

         }

         public Object getKey()

         {

             return key;

         }

         public Object getValue()

         {

             return src.get(key);

         }

         public Object setValue(Object value)

         {

             return src.put(key, value);

         }

     }

     /**

      * 

      */

     private static final long serialVersionUID = 1L;

     private final Object key;

     private final ValueExpression orig;

     /**

      * 

      */

     public MappedValueExpression(ValueExpression orig, Map.Entry entry)

     {

         this.orig = orig;

         this.key = entry.getKey();

     }

     /*

      * (non-Javadoc)

      * 

      * @see javax.el.ValueExpression#getValue(javax.el.ELContext)

      */

     public Object getValue(ELContext context)

     {

         Object base = this.orig.getValue(context);

         if (base != null)

         {

             context.setPropertyResolved(true);

             return new Entry((Map) base, key);

         }

         return null;

     }

     /*

      * (non-Javadoc)

      * 

      * @see javax.el.ValueExpression#setValue(javax.el.ELContext, java.lang.Object)

      */

     public void setValue(ELContext context, Object value)

     {

         Object base = this.orig.getValue(context);

         if (base != null)

         {

             context.setPropertyResolved(false);

             context.getELResolver().setValue(context, base, key, value);

         }

     }

     /*

      * (non-Javadoc)

      * 

      * @see javax.el.ValueExpression#isReadOnly(javax.el.ELContext)

      */

     public boolean isReadOnly(ELContext context)

     {

         Object base = this.orig.getValue(context);

         if (base != null)

         {

             context.setPropertyResolved(false);

             return context.getELResolver().isReadOnly(context, base, key);

         }

         return true;

     }

     /*

      * (non-Javadoc)

      * 

      * @see javax.el.ValueExpression#getType(javax.el.ELContext)

      */

     public Class getType(ELContext context)

     {

         Object base = this.orig.getValue(context);

         if (base != null)

         {

             context.setPropertyResolved(false);

             return context.getELResolver().getType(context, base, key);

         }

         return null;

     }

     /*

      * (non-Javadoc)

      * 

      * @see javax.el.ValueExpression#getExpectedType()

      */

     public Class getExpectedType()

     {

         return Object.class;

     }

     /*

      * (non-Javadoc)

      * 

      * @see javax.el.Expression#getExpressionString()

      */

     public String getExpressionString()

     {

         return this.orig.getExpressionString();

     }

     /*

      * (non-Javadoc)

      * 

      * @see javax.el.Expression#equals(java.lang.Object)

      */

     public boolean equals(Object obj)

     {

         return this.orig.equals(obj);

     }

     /*

      * (non-Javadoc)

      * 

      * @see javax.el.Expression#hashCode()

      */

     public int hashCode()

     {

         // TODO Auto-generated method stub

         return 0;

     }

     /*

      * (non-Javadoc)eturn new Map.Entry<K, V>

      * 

      * @see javax.el.Expression#isLiteralText()

      */

     public boolean isLiteralText()

     {

         // TODO Auto-generated method stub

         return false;

     }

 }