IncludeHandler.java :  » J2EE » facelets » com » sun » facelets » tag » ui » Java Open Source

/**
 * 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 com.sun.facelets.tag.ui;

import java.io.IOException;

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

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

/**
 * @author Jacob Hookom
 * @version $Id: IncludeHandler.java,v 1.4 2008/02/20 16:54:44 rlubke Exp $
 */
public final class IncludeHandler extends TagHandler {

    

    private final TagAttribute src;

    /**
     * @param config
     */
    public IncludeHandler(TagConfig config) {
        super(config);
        this.src = this.getRequiredAttribute("src");
    }

    /*
     * (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 {
        String path = this.src.getValue(ctx);
        if (path == null || path.length() == 0) {
            return;
        }
        VariableMapper orig = ctx.getVariableMapper();
        ctx.setVariableMapper(new VariableMapperWrapper(orig));
        try {
            this.nextHandler.apply(ctx, null);
            ctx.includeFacelet(parent, path);
        } finally {
            ctx.setVariableMapper(orig);
        }
    }
}