/*

  * 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.Location;

 import javax.faces.view.facelets.TagAttribute;

 /**

  * 

  * 

  * @author Jacob Hookom

  * @version $Id$

  */

 public class ContextAwareTagValueExpression

         extends ValueExpression

         implements Externalizable, FacesWrapper<ValueExpression>, ContextAware

 {

     private static final long serialVersionUID = 1L;

     private ValueExpression _wrapped; 

     private Location _location;

     private String _qName;

     public ContextAwareTagValueExpression()

     {

         super();

     }

     public ContextAwareTagValueExpression(TagAttribute tagAttribute, ValueExpression valueExpression)

     {

         _location = tagAttribute.getLocation();

         _qName = tagAttribute.getQName();

         _wrapped = valueExpression;

     }

     public Class<?> getExpectedType()

     {

         return _wrapped.getExpectedType();

     }

     public Class<?> getType(ELContext context)

     {

         try

         {

             return _wrapped.getType(context);

         }

         catch (PropertyNotFoundException pnfe)

         {

             throw new ContextAwarePropertyNotFoundException(getLocation(), getLocalExpressionString(), getQName(),pnfe);

         }

         catch (ELException e)

         {

             throw new ContextAwareELException(getLocation(), getLocalExpressionString(), getQName(), e);

         }

         //Not necessary because NullPointerException by null context never occur and should not be wrapped

         //catch (Exception e)

         //{

         //    throw new ContextAwareException(getLocation(), getLocalExpressionString(), getQName(), e); 

         //}

     }

     public Object getValue(ELContext context)

     {

         try

         {

             return _wrapped.getValue(context);

         }

         catch (PropertyNotFoundException pnfe)

         {

             throw new ContextAwarePropertyNotFoundException(getLocation(), getLocalExpressionString(), getQName(),pnfe);

         }

         catch (ELException e)

         {

             throw new ContextAwareELException(getLocation(), getLocalExpressionString(), getQName(), e);

         }

         //Not necessary because NullPointerException by null context never occur and should not be wrapped

         //catch (Exception e)

         //{

         //    throw new ContextAwareException(getLocation(), getLocalExpressionString(), getQName(), e);

         //}

     }

     private String getLocalExpressionString()

     {

         String expressionString = null;

         try

         {

             expressionString = getExpressionString();

         }

         catch (Throwable t)

         {

             //swallo it because it is not important

         }

         return expressionString;

     }

     public boolean isReadOnly(ELContext context)

     {

         try

         {

             return _wrapped.isReadOnly(context);

         }

         catch (PropertyNotFoundException pnfe)

         {

             throw new ContextAwarePropertyNotFoundException(getLocation(), getLocalExpressionString(), getQName(),pnfe);

         }

         catch (ELException e)

         {

             throw new ContextAwareELException(getLocation(), getLocalExpressionString(), getQName(), e);

         }

         //Not necessary because NullPointerException by null context never occur and should not be wrapped

         //catch (Exception e)

         //{

         //    throw new ContextAwareException(getLocation(), getLocalExpressionString(), getQName(), e);

         //}

     }

     public void setValue(ELContext context, Object value)

     {

         try

         {

             _wrapped.setValue(context, value);

         }

         catch (PropertyNotFoundException pnfe)

         {

             throw new ContextAwarePropertyNotFoundException(getLocation(), getLocalExpressionString(), getQName(),pnfe);

         }

         catch (PropertyNotWritableException pnwe)

         {

             throw new ContextAwarePropertyNotWritableException(getLocation(), getLocalExpressionString(),

                                                                getQName(), pnwe);

         }

         catch (ELException e)

         {

             throw new ContextAwareELException(getLocation(), getLocalExpressionString(), getQName(), e);

         }

         //Not necessary because NullPointerException by null context never occur and should not be wrapped

         //catch (Exception e)

         //{

         //    throw new ContextAwareException(getLocation(), getLocalExpressionString(), getQName(), e);

         //}

     }

     public boolean equals(Object obj)

     {

         return _wrapped.equals(obj);

     }

     public String getExpressionString()

     {

         return _wrapped.getExpressionString();

     }

     public int hashCode()

     {

         return _wrapped.hashCode();

     }

     public boolean isLiteralText()

     {

         return _wrapped.isLiteralText();

     }

     public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException

     {

         _wrapped = (ValueExpression) in.readObject();

         _location = (Location) in.readObject();

         _qName = in.readUTF();

     }

     public void writeExternal(ObjectOutput out) throws IOException

     {

         out.writeObject(_wrapped);

         out.writeObject(_location);

         out.writeUTF(_qName);

     }

     public String toString()

     {

         return _location + ": " + _wrapped;

     }

     public ValueExpression getWrapped()

     {

         return _wrapped;

     }

     public Location getLocation()

     {

         return _location;

     }

     public String getQName()

     {

         return _qName;

     }

 }