/**
* 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 com.sun.facelets.tag.jsf.core;
import java.io.IOException;
import javax.el.ELException;
import javax.faces.FacesException;
import javax.faces.component.UIComponent;
import com.sun.facelets.FaceletContext;
import com.sun.facelets.FaceletException;
import com.sun.facelets.el.ELAdaptor;
import com.sun.facelets.tag.TagAttribute;
import com.sun.facelets.tag.TagConfig;
import com.sun.facelets.tag.TagException;
import com.sun.facelets.tag.TagHandler;
/**
* 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.
* <p />
* See <a target="_new"
* href="http://java.sun.com/j2ee/javaserverfaces/1.1_01/docs/tlddocs/f/attribute.html">tag
* documentation</a>.
*
* @see javax.faces.component.UIComponent#getAttributes()
* @see javax.faces.component.UIComponent#setValueExpression(java.lang.String,
* javax.el.ValueExpression)
* @author Jacob Hookom
* @version $Id: AttributeHandler.java,v 1.3 2008/07/13 19:01:44 rlubke Exp $
*/
public final class AttributeHandler extends TagHandler {
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)
*/
public void apply(FaceletContext ctx, UIComponent parent)
throws IOException, FacesException, FaceletException, ELException {
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 = this.name.getValue(ctx);
if (!parent.getAttributes().containsKey(n)) {
if (this.value.isLiteral()) {
parent.getAttributes().put(n, this.value.getValue());
} else {
ELAdaptor.setExpression(parent, n, this.value
.getValueExpression(ctx, Object.class));
}
}
}
}
}