/*
* Copyright 2004 The Apache Software Foundation.
*
* Licensed 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 javax.faces.webapp;
import javax.faces.application.Application;
import javax.faces.component.UIComponent;
import javax.faces.component.ValueHolder;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.el.ValueBinding;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.Tag;
import javax.servlet.jsp.tagext.TagSupport;
/**
* see Javadoc of <a href="http://java.sun.com/j2ee/javaserverfaces/1.1_01/docs/api/index.html">JSF Specification</a>
*
* @author Manfred Geiler (latest modification by $Author$)
* @version $Revision$ $Date$
*/
public class ConverterTag
extends TagSupport
{
private static final long serialVersionUID = -6168345066829108081L;
private String _converterId;
public ConverterTag()
{
super();
}
public void setConverterId(String converterId)
{
_converterId = converterId;
}
public int doStartTag()
throws JspException
{
UIComponentTag componentTag = UIComponentTag.getParentUIComponentTag(pageContext);
if (componentTag == null)
{
throw new JspException("no parent UIComponentTag found");
}
if (!componentTag.getCreated())
{
return Tag.SKIP_BODY;
}
Converter converter = createConverter();
UIComponent component = componentTag.getComponentInstance();
if (component == null)
{
throw new JspException("parent UIComponentTag has no UIComponent");
}
if (!(component instanceof ValueHolder))
{
throw new JspException("UIComponent is no ValueHolder");
}
((ValueHolder)component).setConverter(converter);
return Tag.SKIP_BODY;
}
public void release()
{
super.release();
_converterId = null;
}
protected Converter createConverter()
throws JspException
{
FacesContext facesContext = FacesContext.getCurrentInstance();
Application application = facesContext.getApplication();
if (UIComponentTag.isValueReference(_converterId))
{
ValueBinding vb = facesContext.getApplication().createValueBinding(_converterId);
return application.createConverter((String)vb.getValue(facesContext));
}
else
{
return application.createConverter(_converterId);
}
}
}