KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > echo2example > chatserver > Log


1 /*
2  * This file is part of the Echo Web Application Framework (hereinafter "Echo").
3  * Copyright (C) 2002-2005 NextApp, Inc.
4  *
5  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6  *
7  * The contents of this file are subject to the Mozilla Public License Version
8  * 1.1 (the "License"); you may not use this file except in compliance with
9  * the License. You may obtain a copy of the License at
10  * http://www.mozilla.org/MPL/
11  *
12  * Software distributed under the License is distributed on an "AS IS" basis,
13  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14  * for the specific language governing rights and limitations under the
15  * License.
16  *
17  * Alternatively, the contents of this file may be used under the terms of
18  * either the GNU General Public License Version 2 or later (the "GPL"), or
19  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
20  * in which case the provisions of the GPL or the LGPL are applicable instead
21  * of those above. If you wish to allow use of your version of this file only
22  * under the terms of either the GPL or the LGPL, and not to allow others to
23  * use your version of this file under the terms of the MPL, indicate your
24  * decision by deleting the provisions above and replace them with the notice
25  * and other provisions required by the GPL or the LGPL. If you do not delete
26  * the provisions above, a recipient may use your version of this file under
27  * the terms of any one of the MPL, the GPL or the LGPL.
28  */
29
30 package echo2example.chatserver;
31
32 import java.io.PrintStream JavaDoc;
33 import java.text.DateFormat JavaDoc;
34 import java.util.Date JavaDoc;
35
36 /**
37  * Primitive utility to log posted messages and users entering and leaving
38  * chat room.
39  */
40 public class Log {
41
42     private static final DateFormat JavaDoc DATE_FORMAT = DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.SHORT);
43     
44     public static final int ACTION_POST = 1;
45     public static final int ACTION_AUTH = 2;
46     public static final int ACTION_EXIT = 3;
47     
48     private static PrintStream JavaDoc logStream = System.err;
49     
50     /**
51      * Sets the <code>PrintStream</code> to which log messages will be written.
52      *
53      * @param logStream the log <code>PrintStream</code>
54      */
55     public static final void setLogStream(PrintStream JavaDoc logStream) {
56         Log.logStream = logStream;
57     }
58     
59     /**
60      * Logs a chat operation.
61      *
62      * @param action the type of action taken, one of the following values:
63      * <ul>
64      * <li><code>ACTION_POST</code></li>
65      * <li><code>ACTION_AUTH</code></li>
66      * <li><code>ACTION_EXIT</code></li>
67      * </ul>
68      * @param remoteHost the remote host performing the action
69      * @param userName the name of the user
70      * @param message the posted message content, if applicable
71      */
72     public static final void log(int action, String JavaDoc remoteHost, String JavaDoc userName, String JavaDoc message) {
73         if (logStream == null) {
74             // Do nothing.
75 return;
76         }
77         String JavaDoc time = DATE_FORMAT.format(new Date JavaDoc());
78         String JavaDoc logMessage;
79         switch (action) {
80         case ACTION_POST:
81             logMessage = "ECHO2CHAT[" + time + "] POST: remoteHost=" + remoteHost + ", userName=" + userName
82                     + ", message=" + message;
83             break;
84         case ACTION_AUTH:
85             logMessage = "ECHO2CHAT[" + time + "] AUTH: remoteHost=" + remoteHost + ", userName=" + userName;
86             break;
87         case ACTION_EXIT:
88             logMessage = "ECHO2CHAT[" + time + "] EXIT: remoteHost=" + remoteHost + ", userName=" + userName;
89             break;
90         default:
91             throw new IllegalArgumentException JavaDoc("Invalid action.");
92         }
93         logStream.println(logMessage);
94     }
95 }
96
Popular Tags