/**
* License Agreement.
*
* Rich Faces - Natural Ajax for Java Server Faces (JSF)
*
* Copyright (C) 2007 Exadel, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation.
*
* This library 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. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.ajax4jsf.taglib.html.jsp;
import javax.el.ValueExpression;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.webapp.UIComponentClassicTagBase;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.Tag;
import javax.servlet.jsp.tagext.TagSupport;
import org.ajax4jsf.Messages;
import org.ajax4jsf.event.AjaxListener;
import org.ajax4jsf.event.AjaxListenerHelper;
import org.ajax4jsf.event.AjaxSource;
import org.richfaces.webapp.taglib.ValueBindingValueExpressionAdaptor;
/**
* @author shura
*
* Custom tag for append AJAX request listeners to AjaxContainer.
*
*/
public class AjaxListenerTag extends TagSupport {
/**
*
*/
private static final long serialVersionUID = 2576519366310474212L;
/**
* class name for ajax events listener.
*/
private ValueExpression type = null;
private ValueExpression binding = null;
/**
*
*/
public AjaxListenerTag() {
}
public void setType(ValueExpression type) {
this.type = type;
}
/**
* @param binding the binding to set
*/
public void setBinding(ValueExpression binding) {
this.binding = binding;
}
public int doStartTag() throws JspException {
if (type == null) {
throw new JspException(Messages.getMessage(Messages.NULL_TYPE_ATTRIBUTE_ERROR));
}
//Find parent UIComponentTag
UIComponentClassicTagBase componentTag =
UIComponentClassicTagBase.getParentUIComponentClassicTagBase(pageContext);
if (componentTag == null) {
throw new JspException(
Messages.getMessage(Messages.NO_UI_COMPONENT_TAG_ANCESTOR_ERROR, "AjaxListenerTag"));
}
if (componentTag.getCreated()) {
//Component was just created, so we add the Listener
UIComponent component = componentTag.getComponentInstance();
if (component instanceof AjaxSource) {
AjaxListener listener;
if(null != binding){
listener = new AjaxListenerHelper(new ValueBindingValueExpressionAdaptor(binding));
} else {
try {
String className = (String) type.getValue(FacesContext.getCurrentInstance().getELContext());
listener = (AjaxListener) Class.forName(className).newInstance();
} catch (Exception e) {
throw new JspException(Messages.getMessage(Messages.INSTANTIATE_LISTENER_ERROR, type, component.getId()), e);
}
}
((AjaxSource) component).addAjaxListener(listener);
} else {
throw new JspException(Messages.getMessage(Messages.NOT_PARENT_AJAX_COMPONENT_ERROR, component.getId()));
}
}
return Tag.SKIP_BODY;
}
}