1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    * Permission is hereby granted, free of charge, to any person obtaining a copy
5    * of this software and associated documentation files (the "Software"), to deal
6    * in the Software without restriction, including without limitation the rights
7    * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8    * copies of the Software, and to permit persons to whom the Software is
9    * furnished to do so, subject to the following conditions:
10   *
11   * The above copyright notice and this permission notice shall be included in
12   * all copies or substantial portions of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.portal.struts;
24  
25  import com.liferay.portal.kernel.servlet.HttpHeaders;
26  import com.liferay.portal.kernel.util.ContentTypes;
27  import com.liferay.portal.util.PortalUtil;
28  
29  import java.io.PrintWriter;
30  
31  import javax.servlet.http.HttpServletRequest;
32  import javax.servlet.http.HttpServletResponse;
33  
34  import org.apache.struts.action.Action;
35  import org.apache.struts.action.ActionForm;
36  import org.apache.struts.action.ActionForward;
37  import org.apache.struts.action.ActionMapping;
38  
39  /**
40   * <a href="AJAXAction.java.html"><b><i>View Source</i></b></a>
41   *
42   * @author Brian Wing Shun Chan
43   *
44   */
45  public abstract class AJAXAction extends Action {
46  
47      public ActionForward execute(
48              ActionMapping mapping, ActionForm form, HttpServletRequest request,
49              HttpServletResponse response)
50          throws Exception {
51  
52          String text = null;
53  
54          try {
55              text = getText(mapping, form, request, response);
56          }
57          catch (Exception e) {
58              PortalUtil.sendError(
59                  HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e, request,
60                  response);
61  
62              return null;
63          }
64  
65          response.setContentType(ContentTypes.TEXT_PLAIN_UTF8);
66          response.setHeader(HttpHeaders.CACHE_CONTROL, "no-cache");
67  
68          PrintWriter pw = response.getWriter();
69  
70          pw.write(text);
71  
72          pw.close();
73  
74          return null;
75      }
76  
77      public abstract String getText(
78              ActionMapping mapping, ActionForm form, HttpServletRequest request,
79              HttpServletResponse response)
80          throws Exception;
81  
82  }