Mercurial > hg > digilib-old

comparison servlet/src/digilib/servlet/Texter.java @ 161:ace2a4a0ba74

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
servlet version 1.16a4 - rather experimental - new Texter servlet for sending text - reads and caches text files in DocuDirCache - DocuFile renamed to ImageFile (-Set) - new TextFile
author robcast
date Tue, 16 Sep 2003 18:32:28 +0200
parents
children 6002ea661acd
comparison
equal deleted inserted replaced
160:aecb57fb8f96 161:ace2a4a0ba74
1 /* Texter.java -- Servlet for displaying text
2
3 Digital Image Library servlet components
4
5 Copyright (C) 2003 Robert Casties (robcast@mail.berlios.de)
6
7 This program is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 2 of the License, or (at your
10 option) any later version.
11
12 Please read license.txt for the full details. A copy of the GPL
13 may be found at http://www.gnu.org/copyleft/lgpl.html
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
19 * Created on 15.09.2003 by casties
20 *
21 */
22 package digilib.servlet;
23
24 import java.io.IOException;
25
26 import javax.servlet.ServletConfig;
27 import javax.servlet.ServletContext;
28 import javax.servlet.ServletException;
29 import javax.servlet.http.HttpServlet;
30 import javax.servlet.http.HttpServletRequest;
31 import javax.servlet.http.HttpServletResponse;
32
33 import digilib.Utils;
34 import digilib.auth.AuthOps;
35 import digilib.io.DocuDirCache;
36 import digilib.io.FileOpException;
37 import digilib.io.FileOps;
38 import digilib.io.TextFile;
39
40 /** Servlet for displaying text
41 *
42 * @author casties
43 *
44 */
45 public class Texter extends HttpServlet {
46
47 /** Servlet version */
48 public static String tlVersion = "0.1a1";
49 /** DigilibConfiguration instance */
50 DigilibConfiguration dlConfig = null;
51 /** Utils instance with debuglevel */
52 Utils util;
53 /** FileOps instance */
54 FileOps fileOp;
55 /** AuthOps instance */
56 AuthOps authOp;
57 /** ServletOps instance */
58 ServletOps servletOp;
59 /** DocuDirCache instance */
60 DocuDirCache dirCache;
61
62 /** use authentication */
63 boolean useAuthentication = false;
64
65 /* (non-Javadoc)
66 * @see javax.servlet.Servlet#init(javax.servlet.ServletConfig)
67 */
68 public void init(ServletConfig config) throws ServletException {
69 super.init(config);
70
71 System.out.println(
72 "***** Digital Image Library Text Servlet (version "
73 + tlVersion
74 + ") *****");
75
76 // get our ServletContext
77 ServletContext context = config.getServletContext();
78 // see if there is a Configuration instance
79 dlConfig =
80 (DigilibConfiguration) context.getAttribute(
81 "digilib.servlet.configuration");
82 if (dlConfig == null) {
83 // create new Configuration
84 try {
85 dlConfig = new DigilibConfiguration(config);
86 context.setAttribute("digilib.servlet.configuration", dlConfig);
87 } catch (Exception e) {
88 throw new ServletException(e);
89 }
90 }
91 // first we need an Utils
92 util = dlConfig.getUtil();
93 // set our AuthOps
94 useAuthentication = dlConfig.getAsBoolean("use-authorization");
95 authOp = (AuthOps) dlConfig.getValue("servlet.auth.op");
96 // FileOps instance
97 fileOp = new FileOps(util);
98 // AuthOps instance
99 servletOp = new ServletOps(util);
100 // DocuDirCache instance
101 dirCache = (DocuDirCache) dlConfig.getValue("servlet.dir.cache");
102 }
103
104 /* (non-Javadoc)
105 * @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
106 */
107 protected void doGet(
108 HttpServletRequest request,
109 HttpServletResponse response)
110 throws ServletException, IOException {
111 // create new request with defaults
112 DigilibRequest dlReq = new DigilibRequest();
113 // set with request parameters
114 dlReq.setWithRequest(request);
115 // add DigilibRequest to ServletRequest
116 request.setAttribute("digilib.servlet.request", dlReq);
117 // do the processing
118 processRequest(request, response);
119 }
120
121 /* (non-Javadoc)
122 * @see javax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
123 */
124 protected void doPost(
125 HttpServletRequest request,
126 HttpServletResponse response)
127 throws ServletException, IOException {
128 // create new request with defaults
129 DigilibRequest dlReq = new DigilibRequest();
130 // set with request parameters
131 dlReq.setWithRequest(request);
132 // add DigilibRequest to ServletRequest
133 request.setAttribute("digilib.servlet.request", dlReq);
134 // do the processing
135 processRequest(request, response);
136 }
137
138 protected void processRequest(
139 HttpServletRequest request,
140 HttpServletResponse response)
141 throws ServletException, IOException {
142
143 /*
144 * request parameters
145 */
146
147 DigilibRequest dlRequest =
148 (DigilibRequest) request.getAttribute("digilib.servlet.request");
149
150 try {
151
152 /*
153 * find the file to load/send
154 */
155
156 // get PathInfo
157 String loadPathName = dlRequest.getFilePath();
158 // find the file(set)
159 TextFile fileToLoad =
160 (TextFile) dirCache.getFile(
161 loadPathName,
162 dlRequest.getPn(),
163 FileOps.CLASS_TEXT);
164 if (fileToLoad == null) {
165 throw new FileOpException(
166 "File "
167 + loadPathName
168 + "("
169 + dlRequest.getPn()
170 + ") not found.");
171 }
172
173 /*
174 * do something with the file
175 */
176
177
178
179 /*
180 * send the result
181 */
182
183 servletOp.sendFile(fileToLoad.getFile(), response);
184
185
186 } catch (FileOpException e) {
187 util.dprintln(1, "ERROR: File IO Error: " + e);
188 try {
189 ServletOps.htmlMessage("ERROR: File IO Error: " + e, response);
190 } catch (FileOpException ex) {
191 } // so we don't get a loop
192 }
193
194 }
195
196 }