org.primefaces.component.autoupdate.AutoUpdateTagHandler Maven / Gradle / Ivy
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PrimeFaces is one of the most popular UI libraries in Java EE Ecosystem and widely used by software companies, world renowned brands, banks, financial institutions, insurance companies, universities and more.
/**
* Copyright 2009-2018 PrimeTek.
*
* 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 org.primefaces.component.autoupdate;
import java.io.IOException;
import javax.el.ELException;
import javax.faces.FacesException;
import javax.faces.component.UIComponent;
import javax.faces.event.PostAddToViewEvent;
import javax.faces.event.PreRenderComponentEvent;
import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.FaceletException;
import javax.faces.view.facelets.TagAttribute;
import javax.faces.view.facelets.TagConfig;
import javax.faces.view.facelets.TagHandler;
public class AutoUpdateTagHandler extends TagHandler {
private static final AutoUpdateListener LISTENER = new AutoUpdateListener(false);
private static final AutoUpdateListener LISTENER_DISABLED = new AutoUpdateListener(true);
private final TagAttribute disabledAttribute;
public AutoUpdateTagHandler(TagConfig tagConfig) {
super(tagConfig);
disabledAttribute = getAttribute("disabled");
}
@Override
public void apply(FaceletContext faceletContext, UIComponent parent) throws IOException, FacesException, FaceletException, ELException {
boolean disabled = false;
if (disabledAttribute != null) {
disabled = disabledAttribute.getBoolean(faceletContext);
}
// PostAddToViewEvent should work for stateless views
// but fails for MyFaces ViewPooling
// and sometimes on postbacks as PostAddToViewEvent should actually ony be called once
parent.subscribeToEvent(PostAddToViewEvent.class, disabled ? LISTENER_DISABLED : LISTENER);
// PreRenderComponentEvent should work for normal cases and MyFaces ViewPooling
// but likely fails for stateless view as we save the clientIds in the viewRoot
parent.subscribeToEvent(PreRenderComponentEvent.class, disabled ? LISTENER_DISABLED : LISTENER);
}
}