/*
    * 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 java.io.Externalizable;
  import java.io.IOException;
  import java.io.ObjectInput;
  import java.io.ObjectOutput;
  
  import javax.el.ELContext;
  import javax.el.ELException;
  import javax.el.PropertyNotFoundException;
  import javax.el.PropertyNotWritableException;
  import javax.el.ValueExpression;
  import javax.faces.FacesWrapper;
  import javax.faces.view.facelets.TagAttribute;
  
  /**
   * 
   * 
   * @author Jacob Hookom
   * @version $Id$
   */
  public class TagValueExpression extends ValueExpression implements Externalizable, FacesWrapper<ValueExpression>
  {
  
      private static final long serialVersionUID = 1L;
  
      // orig and attr need to be available in TagValueExpressionUEL
      ValueExpression orig; 
      String attr; 
  
      public TagValueExpression()
      {
          super();
      }
  
      public TagValueExpression(TagAttribute attr, ValueExpression orig)
      {
          this.attr = attr.toString();
          this.orig = orig;
      }
  
      public Class<?> getExpectedType()
      {
          return this.orig.getExpectedType();
      }
  
      public Class<?> getType(ELContext context)
      {
          try
          {
              return this.orig.getType(context);
          }
          catch (PropertyNotFoundException pnfe)
          {
              throw new PropertyNotFoundException(this.attr + ": " + pnfe.getMessage(), pnfe.getCause());
          }
          catch (ELException e)
          {
              throw new ELException(this.attr + ": " + e.getMessage(), e.getCause());
          }
      }
  
      public Object getValue(ELContext context)
      {
          try
          {
              return this.orig.getValue(context);
          }
          catch (PropertyNotFoundException pnfe)
          {
              throw new PropertyNotFoundException(this.attr + ": " + pnfe.getMessage(), pnfe.getCause());
          }
          catch (ELException e)
          {
              throw new ELException(this.attr + ": " + e.getMessage(), e.getCause());
          }
      }
  
      public boolean isReadOnly(ELContext context)
      {
          try
         {
             return this.orig.isReadOnly(context);
         }
         catch (PropertyNotFoundException pnfe)
         {
             throw new PropertyNotFoundException(this.attr + ": " + pnfe.getMessage(), pnfe.getCause());
         }
         catch (ELException e)
         {
             throw new ELException(this.attr + ": " + e.getMessage(), e.getCause());
         }
     }
 
     public void setValue(ELContext context, Object value)
     {
         try
         {
             this.orig.setValue(context, value);
         }
         catch (PropertyNotFoundException pnfe)
         {
             throw new PropertyNotFoundException(this.attr + ": " + pnfe.getMessage(), pnfe.getCause());
         }
         catch (PropertyNotWritableException pnwe)
         {
             throw new PropertyNotWritableException(this.attr + ": " + pnwe.getMessage(), pnwe.getCause());
         }
         catch (ELException e)
         {
             throw new ELException(this.attr + ": " + e.getMessage(), e.getCause());
         }
     }
     
     public boolean equals(Object obj)
     {
         return this.orig.equals(obj);
     }
 
     public String getExpressionString()
     {
         return this.orig.getExpressionString();
     }
 
     public int hashCode()
     {
         return this.orig.hashCode();
     }
 
     public boolean isLiteralText()
     {
         return this.orig.isLiteralText();
     }
 
     public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException
     {
         this.orig = (ValueExpression) in.readObject();
         this.attr = in.readUTF();
     }
 
     public void writeExternal(ObjectOutput out) throws IOException
     {
         out.writeObject(this.orig);
         out.writeUTF(this.attr);
     }
 
     public String toString()
     {
         return this.attr + ": " + this.orig;
     }
 
     public ValueExpression getWrapped()
     {
         return orig;
     }
 }