JsfUrlTagHandler.java

/**
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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 org.wicketstuff.jeeweb.jsf;

import java.io.IOException;

import javax.faces.component.UIComponent;
import javax.faces.component.UIComponentBase;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.TagAttribute;
import javax.faces.view.facelets.TagConfig;
import javax.faces.view.facelets.TagHandler;

import org.apache.wicket.Page;
import org.apache.wicket.core.util.lang.WicketObjects;
import org.apache.wicket.protocol.http.RequestUtils;
import org.apache.wicket.request.cycle.RequestCycle;
import org.apache.wicket.request.mapper.parameter.PageParameters;

/**
 * Same as JspUrlTagSupport but for JSF
 * 
 * @see org.wicketstuff.jeeweb.jsp.JspUrlTagSupport
 * 
 * @author Tobias Soloschenko
 */
public final class JsfUrlTagHandler extends TagHandler
{

	private String page;

	private String query;

	/**
	 * Creates the tag by reading the config which contains the page and the query as param
	 * 
	 * @param config
	 *            the tag config to read the params
	 */
	public JsfUrlTagHandler(TagConfig config)
	{
		super(config);
		TagAttribute page = getAttribute("page");
		if (page != null)
		{
			this.page = page.getValue();
		}
		TagAttribute query = getAttribute("query");
		if (query != null)
		{
			this.query = query.getValue();
		}
	}

	/**
	 * Applies the url of wicket to the tag
	 */
	@Override
	public void apply(FaceletContext context, UIComponent parent) throws IOException
	{

		PageParameters pageParameters = new PageParameters();
		if (query != null)
		{
			RequestUtils.decodeParameters(query, pageParameters);
		}
		Class<Page> resolveClass = WicketObjects.resolveClass(page);
		RequestCycle requestCycle = RequestCycle.get();
		if (requestCycle != null)
		{
			final CharSequence urlFor = requestCycle.urlFor(resolveClass, pageParameters);

			UIComponentBase c = new UIComponentBase()
			{
				public void encodeEnd(FacesContext ctx) throws IOException
				{
					ResponseWriter w = ctx.getResponseWriter();
					w.write(urlFor.toString());
				}

				// abstract method in base, must override
				public String getFamily()
				{
					return "wicket.jsf.taglib";
				}
			};
			parent.getChildren().add(c);
		}
	}
}