DAVException


1   /* ========================================================================== *
2    * Copyright (C) 2004-2005 Pier Fumagalli <http://www.betaversion.org/~pier/> *
3    *                            All rights reserved.                            *
4    * ========================================================================== *
5    *                                                                            *
6    * Licensed under the  Apache License, Version 2.0  (the "License").  You may *
7    * not use this file except in compliance with the License.  You may obtain a *
8    * copy of the License at <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, WITHOUT *
12   * WARRANTIES OR  CONDITIONS OF ANY KIND, either express or implied.  See the *
13   * License for the  specific language  governing permissions  and limitations *
14   * under the License.                                                         *
15   *                                                                            *
16   * ========================================================================== */
17  package com.sslexplorer.vfs.webdav;
18  
19  import java.io.IOException  ;
20  import java.io.PrintWriter  ;
21  
22  import com.sslexplorer.vfs.VFSResource;
23  
24  
25  /**
26   * <p>A {@link RuntimeException} representing a
27   * <a HREF="http://www.rfc-editor.org/rfc/rfc2518.txt">WebDAV</a>
28   * response for a specified {@link VFSResource}.</p> 
29   *
30   * @author <a HREF="http://www.betaversion.org/~pier/">Pier Fumagalli</a>
31   */
32  public class DAVException extends RuntimeException   {
33      
34      private VFSResource resource = null;
35      private int status = 0;
36  
37      /**
38       * <p>Create a new {@link DAVException} instance.</p>
39       */
40      public DAVException(int status, String   message) {
41          this(status, message, null, null);
42      }
43  
44      /**
45       * <p>Create a new {@link DAVException} instance.</p>
46       */
47      public DAVException(int status, String   message, Throwable   throwable) {
48          this(status, message, throwable, null);
49      }
50  
51      /**
52       * <p>Create a new {@link DAVException} instance.</p>
53       */
54      public DAVException(int status, String   message, VFSResource resource) {
55          this(status, message, null, resource);
56      }
57  
58      /**
59       * <p>Create a new {@link DAVException} instance.</p>
60       */
61      public DAVException(int s, String   m, Throwable   t, VFSResource r) {
62          super(m, t);
63          this.resource = r;
64          this.status = s;
65      }
66  
67      /**
68       * <p>Return the status code associated with this instance.</p>
69       */
70      public int getStatus() {
71          return this.status;
72      }
73  
74      /**
75       * <p>Return the {@link VFSResource} associated with this instance.</p>
76       */
77      public VFSResource getResource() {
78          return this.resource;
79      }
80  
81      /**
82       * <p>Write the body of this {@link DAVException} to the specified
83       * {@link DAVTransaction}'s output.</p>
84       */
85      public void write(DAVTransaction transaction)
86      throws IOException   {
87          transaction.setContentType("text/html; charset=\"utf-8\"");
88          transaction.setStatus(this.getStatus());
89  
90          /* Prepare and log the error message */
91          String   message = DAVUtilities.getStatusMessage(this.getStatus()); 
92          if (message == null) {
93              transaction.setStatus(500);
94              message = Integer.toString(this.getStatus()) + " Unknown";
95          }
96  
97          /* Write the error message to the client */
98          PrintWriter   out = transaction.write("utf-8");
99          out.println("<html>");
100         out.print("<head><title>Error ");
101         out.print(message);
102         out.println("</title></head>");
103         out.println("<body>");
104         out.print("<p><b>Error ");
105         out.print(message);
106         out.println("</b></p>");
107         
108         /* Check if we have a resource associated with the extension */
109         if (this.getResource() != null) {
110             String   r = transaction.lookup(this.getResource()).toASCIIString();
111             out.print("<p>Resource in error: <a HREF=\"");
112             out.print(r);
113             out.println("\">");
114             out.print(r);
115             out.println("</a></p>");
116         }
117 
118         /* Process any exception and its cause */
119         Throwable   throwable = this;
120         out.println("<hr /><p>Exception details:</p>");
121         while (throwable != null) {
122             out.print("<pre>");
123             throwable.printStackTrace(out);
124             out.println("</pre>");
125             throwable = throwable.getCause();
126             if (throwable != null) out.println("<hr /><p>Caused by:</p>");
127         }
128 
129         /* Close up the HTML */
130         out.println("</body>");
131         out.println("</html>");
132         out.flush();
133     }
134 }
135
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