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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.facelets.tag.jsf.core;
import com.sun.faces.facelets.tag.TagHandlerImpl;
import javax.faces.component.UIComponent;
import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.TagAttribute;
import javax.faces.view.facelets.TagConfig;
import javax.faces.view.facelets.TagException;
import java.io.IOException;
/**
* Sets the specified name and attribute on the parent UIComponent. If the
* "value" specified is not a literal, it will instead set the ValueExpression
* on the UIComponent.
*
* See tag
* documentation.
*
* @see javax.faces.component.UIComponent#getAttributes()
* @see javax.faces.component.UIComponent#setValueExpression(java.lang.String,
* javax.el.ValueExpression)
* @author Jacob Hookom
*/
public final class AttributeHandler extends TagHandlerImpl
implements javax.faces.view.facelets.AttributeHandler {
private final TagAttribute name;
private final TagAttribute value;
/**
* @param config
*/
public AttributeHandler(TagConfig config) {
super(config);
this.name = this.getRequiredAttribute("name");
this.value = this.getRequiredAttribute("value");
}
/*
* (non-Javadoc)
*
* @see com.sun.facelets.FaceletHandler#apply(com.sun.facelets.FaceletContext,
* javax.faces.component.UIComponent)
*/
@Override
public void apply(FaceletContext ctx, UIComponent parent)
throws IOException {
if (parent == null) {
throw new TagException(this.tag, "Parent UIComponent was null");
}
// only process if the parent is new to the tree
if (parent.getParent() == null) {
String n = getAttributeName(ctx);
if (!parent.getAttributes().containsKey(n)) {
if (this.value.isLiteral()) {
parent.getAttributes().put(n, this.value.getValue());
} else {
parent.setValueExpression(n, this.value.getValueExpression(ctx, Object.class));
}
}
}
}
// javax.faces.view.facelets.tag.AttributeHandler.getAttributeName()
// implementation.
@Override
public String getAttributeName(FaceletContext ctxt) {
return this.name.getValue(ctxt);
}
}