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HTTL Struts Integration.

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/*
 * Copyright 2011-2013 HTTL Team.
 *  
 * 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 httl.web.struts;

import httl.web.WebEngine;

import java.io.IOException;
import java.io.Writer;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletContext;

import org.apache.struts2.ServletActionContext;
import org.apache.struts2.components.template.BaseTemplateEngine;
import org.apache.struts2.components.template.Template;
import org.apache.struts2.components.template.TemplateRenderingContext;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.util.ValueStack;

/**
 * HttlTemplateEngine. (Integration, Singleton, ThreadSafe)
 * 
 * @author Liang Fei (liangfei0201 AT gmail DOT com)
 */
public class HttlTemplateEngine extends BaseTemplateEngine {

	public void renderTemplate(TemplateRenderingContext templateContext) throws Exception {
		// get the various items required from the stack
		Map actionContext = templateContext.getStack().getContext();
		ServletContext servletContext = (ServletContext) actionContext.get(ServletActionContext.SERVLET_CONTEXT);

		// prepare httl
		WebEngine.setServletContext(servletContext);

		// get the list of templates we can use
		List