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1   /*
2    * Copyright 2007-2008 the original author or authors.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.gwe.app.client.web.servlet;
18  
19  import java.io.FileOutputStream;
20  import java.io.IOException;
21  
22  import javax.servlet.ServletException;
23  import javax.servlet.http.HttpServlet;
24  import javax.servlet.http.HttpServletRequest;
25  import javax.servlet.http.HttpServletResponse;
26  
27  import org.gwe.app.client.config.ClientConfig;
28  import org.gwe.app.client.web.GWEServletContext;
29  import org.gwe.app.client.web.request.PageModel;
30  import org.gwe.app.client.web.view.MainVelocityTemplate;
31  import org.gwe.utils.VelocityUtils;
32  
33  
34  /**
35   * @author Marco Ruiz
36   * @since Dec 13, 2008
37   */
38  public abstract class GWEServlet extends HttpServlet {
39  
40  	private String contextRelativePath;
41  	private String template;
42  
43  	public GWEServlet(String context) {
44  		this.contextRelativePath = context;
45  	}
46  	
47  	public void setMainTemplate(MainVelocityTemplate mainTemplate) throws IOException {
48  		this.template = mainTemplate.createPageTemplate(getTemplateName());
49      }
50  
51  	protected ClientConfig getConfig() {
52      	return (ClientConfig) getServletContext().getAttribute(GWEServletContext.GWE_CONFIGURATION);
53      }
54  
55  	protected String getTemplateName() {
56  		return contextRelativePath + ".html";
57  	}
58  	
59  	public String getContextRelativePath() {
60      	return contextRelativePath;
61      }
62  
63      protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
64  		response.setContentType("text/html");
65          response.setStatus(HttpServletResponse.SC_OK);
66  		response.getWriter().println(createPage(request));
67      }
68  
69  	private String createPage(HttpServletRequest request) throws ServletException {
70  	    try {
71  	        return VelocityUtils.mergeThrowingExceptions(createPageModel(request), template);
72          } catch (Exception e) {
73          	throw new ServletException("Problems parsing velocity template", e);
74          }
75      }
76  
77  	/**
78  	 * Default implementation
79  	 * 
80  	 * @param request
81  	 * @return
82  	 */
83  	protected PageModel createPageModel(HttpServletRequest request) {
84  		return new PageModel(request, getConfig());
85  	}
86  	
87  	public static void main(String[] args) throws IOException {
88  		GWEServlet servlet = new GWEServlet("macro") {};
89  		servlet.setMainTemplate(new MainVelocityTemplate());
90  		String page = VelocityUtils.evaluate(servlet.template);
91  		FileOutputStream fos = new FileOutputStream("/Users/admin/work/eclipse-ws/gwe-core/tmp/web/test.html");
92  		fos.write(page.getBytes());
93  		fos.close();
94  	}
95  }
96  
97  
98