/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package javax.faces.webapp;
import java.io.*;
import java.util.*;
import javax.el.*;
import javax.faces.*;
import javax.faces.application.*;
import javax.faces.component.*;
import javax.faces.context.*;
import javax.faces.convert.*;
import javax.faces.el.*;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
public class ConverterTag extends TagSupport
{
private String _id;
private ValueExpression _binding;
public void setConverterId(String id)
{
_id = id;
}
public void setBinding(String binding)
throws JspException
{
FacesContext context = FacesContext.getCurrentInstance();
Application app = context.getApplication();
ExpressionFactory factory = app.getExpressionFactory();
_binding = factory.createValueExpression(context.getELContext(),
binding,
Converter.class);
}
public int doStartTag()
throws JspException
{
UIComponentClassicTagBase parent;
parent = UIComponentClassicTagBase.getParentUIComponentClassicTagBase(this.pageContext);
if (parent == null)
throw new JspException("ConverterTag must be nested inside a UIComponent tag.");
UIComponent comp = parent.getComponentInstance();
if (parent.getCreated()) {
if (! (comp instanceof ValueHolder))
throw new JspException("UIComponent parent of converter must be a ValueHolder.");
ValueHolder valueHolder = (ValueHolder) comp;
Converter converter = createConverter();
valueHolder.setConverter(converter);
}
return SKIP_BODY;
}
protected Converter createConverter()
throws JspException
{
try {
FacesContext context = FacesContext.getCurrentInstance();
Converter converter;
if (_binding != null) {
converter = (Converter) _binding.getValue(context.getELContext());
if (converter != null)
return converter;
}
converter = context.getApplication().createConverter(_id);
if (_binding != null)
_binding.setValue(context.getELContext(), converter);
return converter;
} catch (Exception e) {
throw new JspException(e);
}
}
}