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The private implementation classes of the Apache MyFaces Core JSF-2.1 Implementation
/*
* 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: jakobk $)
* @version $Revision: 922543 $ $Date: 2010-03-13 06:55:01 -0500 (Sat, 13 Mar 2010) $
*/
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;
}
}