1 //
2 // Copyright (c) 2003, 2004, Caltha - Gajda, Krzewski, Mach, Potempski Sp.J.
3 // All rights reserved.
4 //
5 // Redistribution and use in source and binary forms, with or without modification,
6 // are permitted provided that the following conditions are met:
7 //
8 // * Redistributions of source code must retain the above copyright notice,
9 // this list of conditions and the following disclaimer.
10 // * Redistributions in binary form must reproduce the above copyright notice,
11 // this list of conditions and the following disclaimer in the documentation
12 // and/or other materials provided with the distribution.
13 // * Neither the name of the Caltha - Gajda, Krzewski, Mach, Potempski Sp.J.
14 // nor the names of its contributors may be used to endorse or promote products
15 // derived from this software without specific prior written permission.
16 //
17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18 // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 // IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
21 // INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
22 // BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
23 // OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 // POSSIBILITY OF SUCH DAMAGE.
27 //
28 package org.objectledge.web.mvc;
29
30 import java.io.IOException;
31 import java.io.PrintWriter;
32
33 import org.objectledge.context.Context;
34 import org.objectledge.pipeline.ErrorHandlingPipeline;
35 import org.objectledge.pipeline.ProcessingException;
36 import org.objectledge.pipeline.Valve;
37 import org.objectledge.utils.StackTrace;
38 import org.objectledge.utils.StringUtils;
39 import org.objectledge.web.HttpContext;
40
41 /***
42 * Pipeline component for putting the MVC view building results to the response.
43 *
44 * <p>
45 * The build results are only put into the response if no direct response has been triggered.
46 * </p>
47 *
48 * @author <a href="mailto:dgajda@caltha.pl">Damian Gajda</a>
49 * @version $Id: MVCResultsValve.java,v 1.9 2005/07/22 17:25:50 pablo Exp $
50 */
51 public class MVCResultsValve
52 implements Valve
53 {
54 /***
55 * Run view building starting from a view builder chosen in request parameters.
56 *
57 * @param context used application context
58 * @throws ProcessingException if the processing fails.
59 */
60 public void process(Context context)
61 throws ProcessingException
62 {
63 HttpContext httpContext = HttpContext.getHttpContext(context);
64 if(!httpContext.getDirectResponse())
65 {
66 MVCContext mvcContext = MVCContext.getMVCContext(context);
67 String result = mvcContext.getBuildResult();
68 try
69 {
70 if(result == null)
71 {
72 Exception e = (Exception)context.
73 getAttribute(ErrorHandlingPipeline.PIPELINE_EXCEPTION);
74 if(e != null)
75 {
76 result = new StackTrace(e).toString();
77 }
78 else
79 {
80 result = "no processing result was set in mvcContext "
81 +"- check the pipeline configuration";
82 }
83 }
84 httpContext.getResponse().setContentLength(
85 StringUtils.getByteCount(result, httpContext.getEncoding()));
86 PrintWriter out = httpContext.getPrintWriter();
87 out.write(result);
88 out.flush();
89 }
90 ///CLOVER:OFF
91 catch(IOException e)
92 {
93 throw new ProcessingException("Cannot write the response",e);
94 }
95 ///CLOVER:ON
96 }
97 }
98 }