/*
* 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 com.caucho.jsf.taglib;
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.event.*;
import javax.faces.el.*;
import javax.faces.webapp.*;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
public class ValueChangeListenerTag extends TagSupport
{
private ValueExpression _type;
private ValueExpression _binding;
public void setType(ValueExpression type)
{
_type = type;
}
public void setBinding(ValueExpression binding)
{
_binding = binding;
}
public int doStartTag()
throws JspException
{
UIComponentClassicTagBase parent;
parent = UIComponentClassicTagBase.getParentUIComponentClassicTagBase(this.pageContext);
if (parent == null)
throw new JspException("f:valueChangeListener must be nested inside a UIComponent tag.");
UIComponent comp = parent.getComponentInstance();
if (parent.getCreated()) {
if (! (comp instanceof EditableValueHolder))
throw new JspException("f:valueChangeListener parent of validator must be a EditableValueHolder.");
EditableValueHolder valueHolder = (EditableValueHolder) comp;
ValueChangeListener listener = createListener();
valueHolder.addValueChangeListener(listener);
}
return SKIP_BODY;
}
protected ValueChangeListener createListener()
throws JspException
{
FacesContext context = FacesContext.getCurrentInstance();
ValueChangeListener listener = null;
ELContext elContext = context.getELContext();
if (_binding != null)
listener = (ValueChangeListener) _binding.getValue(elContext);
if (listener == null && _type != null) {
String type = (String) _type.getValue(elContext);
try {
ClassLoader loader = Thread.currentThread().getContextClassLoader();
Class cl = Class.forName(type, false, loader);
listener = (ValueChangeListener) cl.newInstance();
} catch (Exception e) {
throw new JspException(e);
}
if (_binding != null)
_binding.setValue(elContext, listener);
}
return listener;
}
}