/*

  * 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.taglib.core;

 import javax.el.ELContext;

 import javax.el.ValueExpression;

 import javax.faces.context.FacesContext;

 import javax.faces.convert.Converter;

 import javax.faces.webapp.ConverterELTag;

 import javax.servlet.jsp.JspException;

 /**

  * Implementation of ConverterELTag

  * 

  * @author Bruno Aranda (latest modification by $Author$)

  * @version $Revision$ $Date$

  */

 public class ConverterTag extends ConverterELTag

 {

     private static final long serialVersionUID = -4506829108081L;

     private ValueExpression _converterId;

     private ValueExpression _binding;

     private String _converterIdString = null;

     public ConverterTag()

     {

         super();

     }

     public void setConverterId(ValueExpression converterId)

     {

         _converterId = converterId;

     }

     public void setBinding(ValueExpression binding)

     {

         _binding = binding;

     }

     /**

      * Use this method to specify the converterId programmatically.

      * 

      * @param converterIdString

      */

     public void setConverterIdString(String converterIdString)

     {

         _converterIdString = converterIdString;

     }

     @Override

     public void release()

     {

         super.release();

         _converterId = null;

         _binding = null;

         _converterIdString = null;

     }

     @Override

     protected Converter createConverter() throws JspException

     {

         Converter converter = null;

         FacesContext facesContext = FacesContext.getCurrentInstance();

         ELContext elContext = facesContext.getELContext();

         // try to create the converter from the binding expression first, and then from

         // the converterId

         if (_binding != null)

         {

             try

             {

                 converter = (Converter)_binding.getValue(elContext);

                 if (converter != null)

                 {

                     return converter;

                 }

             }

             catch (Exception e)

             {

                 throw new JspException("Exception creating converter using binding", e);

             }

         }

         if ((_converterId != null) || (_converterIdString != null))

         {

             try

             {

                 if (null != _converterIdString)

                 {

                     converter = facesContext.getApplication().createConverter(_converterIdString);

                 }

                 else

                 {

                     String converterId = (String)_converterId.getValue(elContext);

                     converter = facesContext.getApplication().createConverter(converterId);

                 }

                 // with binding no converter was created, set its value with the converter

                 // created using the converterId

                 if (converter != null && _binding != null)

                 {

                     _binding.setValue(elContext, converter);

                 }

             }

             catch (Exception e)

             {

                 throw new JspException("Exception creating converter with converterId: " + _converterId, e);

             }

         }

         if (converter == null)

         {

             throw new JspException("Could not create converter. Please specify a valid converterId" +

                     " or a non-null binding.");

         }

         return converter;

     }

 }