/**
* 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.facelets;
import java.io.IOException;
import javax.el.ELException;
import javax.faces.FacesException;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.el.ValueBinding;
import org.ajax4jsf.Messages;
import org.ajax4jsf.event.AjaxPhaseListener;
import com.sun.facelets.FaceletContext;
import com.sun.facelets.FaceletException;
import com.sun.facelets.tag.TagAttribute;
import com.sun.facelets.tag.TagAttributeException;
import com.sun.facelets.tag.TagConfig;
import com.sun.facelets.tag.TagHandler;
/**
* @author shura
*
*/
public class KeepAliveHandler extends TagHandler {
private final TagAttribute beanName;
private final TagAttribute ajaxOnly;
/**
* @param config
*/
public KeepAliveHandler(TagConfig config) {
super(config);
this.beanName = this.getRequiredAttribute("beanName");
if (beanName != null) {
if (!beanName.isLiteral()) {
throw new TagAttributeException(this.tag, this.beanName, Messages.getMessage(Messages.MUST_BE_LITERAL_ERROR));
}
}
this.ajaxOnly = getAttribute("ajaxOnly");
}
/* (non-Javadoc)
* @see com.sun.facelets.FaceletHandler#apply(com.sun.facelets.FaceletContext, javax.faces.component.UIComponent)
*/
public void apply(FaceletContext ctx, UIComponent parent)
throws IOException, FacesException, FaceletException, ELException {
// Get bean instance from EL expression.
String name = beanName.getValue();
boolean isAjaxOnly = ajaxOnly!=null?ajaxOnly.getBoolean(ctx):false;
FacesContext facesContext = ctx.getFacesContext();
String beanExpression = "#{"+name+"}";
ValueBinding valueBinding = facesContext.getApplication().createValueBinding(beanExpression);
Object bean = valueBinding.getValue(facesContext);
String beanAttributeName = (isAjaxOnly ? AjaxPhaseListener.AJAX_BEAN_PREFIX : AjaxPhaseListener.VIEW_BEAN_PREFIX)
+ name;
// Put bean instance to ViewRoot.
facesContext.getViewRoot().getAttributes().put(beanAttributeName, bean);
}
}