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Ajax4jsf is an open source extension to the JavaServer Faces standard that adds AJAX capability to JSF applications without requiring the writing of any JavaScript.

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/**
 * Licensed under the Common Development and Distribution License,
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.sun.com/cddl/
 *   
 * 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.ajax4jsf.tag;

import java.io.IOException;

import javax.el.ELException;
import javax.faces.FacesException;
import javax.faces.component.UIComponent;
import javax.faces.component.UIComponentBase;

import org.ajax4jsf.framework.util.message.Messages;

import com.sun.facelets.FaceletContext;
import com.sun.facelets.FaceletException;
import com.sun.facelets.tag.TagAttribute;
import com.sun.facelets.tag.TagConfig;
import com.sun.facelets.tag.TagException;
import com.sun.facelets.tag.TagHandler;

/**
 * Register a named facet on the UIComponent associated with the closest parent
 * UIComponent custom action.  See tag
 * documentation.
 * 
 * @author Jacob Hookom
 * @version $Id: FacetHandler.java,v 1.4 2006/07/29 11:49:07 alexsmirnov Exp $
 */
public final class FacetHandler extends TagHandler {

    /**
     * A UIComponent for capturing a child UIComponent, representative of the
     * desired Facet
     * 
     * @author Jacob Hookom
     * 
     */
    private final static class UIFacet extends UIComponentBase {
        public String getFamily() {
            return null;
        }
    }

    protected final TagAttribute name;

    public FacetHandler(TagConfig config) {
        super(config);
        this.name = this.getRequiredAttribute("name");
    }

    /* (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 {
        UIFacet facet = new UIFacet();
        UIComponent c;
        // Check for existing facet
        String facetName = this.name.getValue(ctx);
		c = parent.getFacet(facetName);
        if (null != c) {
			parent.getFacets().remove(facetName);
			facet.getChildren().add(c);
		}
        this.nextHandler.apply(ctx, facet);
        int childCount = facet.getChildCount();
        if (childCount == 1) {
            c = (UIComponent) facet.getChildren().get(0);
            parent.getFacets().put(facetName, c);
        } else {
            throw new TagException(this.tag, Messages.getMessage(Messages.FACET_TAG_MANY_CHILDREN_ERROR));
        }
    }
}