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EE4J Compatible Implementation for Jakarta Faces API
/*
* Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package com.sun.faces.renderkit.html_basic;
import com.sun.faces.renderkit.Attribute;
import com.sun.faces.renderkit.AttributeManager;
import com.sun.faces.renderkit.RenderKitUtils;
import java.io.IOException;
import java.util.Iterator;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
/**
* Arbitrary grouping "renderer" that simply renders its children
* recursively in the encodeEnd() method.
*
*/
public class GroupRenderer extends HtmlBasicRenderer {
private static final Attribute[] ATTRIBUTES =
AttributeManager.getAttributes(AttributeManager.Key.PANELGROUP);
// ---------------------------------------------------------- Public Methods
@Override
public void encodeBegin(FacesContext context, UIComponent component)
throws IOException {
rendererParamsNotNull(context, component);
if (!shouldEncode(component)) {
return;
}
// Render a span around this group if necessary
String style = (String) component.getAttributes().get("style");
String styleClass = (String) component.getAttributes().get("styleClass");
ResponseWriter writer = context.getResponseWriter();
if (divOrSpan(component)) {
if (("block".equals(component.getAttributes().get("layout")))) {
writer.startElement("div", component);
} else {
writer.startElement("span", component);
}
writeIdAttributeIfNecessary(context, writer, component);
if (styleClass != null) {
writer.writeAttribute("class", styleClass, "styleClass");
}
// JAVASERVERFACES-3270: do not manually render "style" as it is handled
// in renderPassThruAttributes().
}
RenderKitUtils.renderPassThruAttributes(context,
writer,
component,
ATTRIBUTES);
}
@Override
public void encodeChildren(FacesContext context, UIComponent component)
throws IOException {
rendererParamsNotNull(context, component);
if (!shouldEncodeChildren(component)) {
return;
}
// Render our children recursively
Iterator kids = getChildren(component);
while (kids.hasNext()) {
encodeRecursive(context, kids.next());
}
}
@Override
public void encodeEnd(FacesContext context, UIComponent component)
throws IOException {
rendererParamsNotNull(context, component);
if (!shouldEncode(component)) {
return;
}
// Close our span element if necessary
ResponseWriter writer = context.getResponseWriter();
if (divOrSpan(component)) {
if ("block".equals(component.getAttributes().get("layout"))) {
writer.endElement("div");
} else {
writer.endElement("span");
}
}
}
@Override
public boolean getRendersChildren() {
return true;
}
// --------------------------------------------------------- Private Methods
/**
* @param component UIComponent for this group
*
* @return true if we need to render a div or span element
* around this group.
*/
private boolean divOrSpan(UIComponent component) {
return (shouldWriteIdAttribute(component) ||
(component.getAttributes().get("style") != null) ||
(component.getAttributes().get("styleClass") != null));
}
}