org/openisis/Log.java

/*
        openisis - an open implementation of the CDS/ISIS database
        Version 0.8.x (patchlevel see file Version)
        Copyright (C) 2001-2003 by Erik Grziwotz, erik@openisis.org

        This library is free software; you can redistribute it and/or
        modify it under the terms of the GNU Lesser General Public
        License as published by the Free Software Foundation; either
        version 2.1 of the License, or (at your option) any later version.

        This library is distributed in the hope that it will be useful,
        but WITHOUT ANY WARRANTY; without even the implied warranty of
        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        Lesser General Public License for more details.

        You should have received a copy of the GNU Lesser General Public
        License along with this library; if not, write to the Free Software
        Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

        see README for more information
EOH */

package org.openisis;

import java.io.*;
import java.util.Date;
import java.text.SimpleDateFormat;

/**
        Logger.
<p>
        $Id: Log.java,v 1.1 2003/04/12 14:48:21 mawag Exp $
        @version $Revision: 1.1 $
        @author  $Author: mawag $
*/
public class Log {

        /** Error log level */
        public static final int ERROR = 1;
        /**     Warning log level */
        public static final int WARN = ERROR + 1;
        /** Info log level */
        public static final int INFO = WARN + 1;
        /**     Verbose log level */
        public static final int VERBOSE = INFO + 1;

        private static SimpleDateFormat TheFormat =
                new SimpleDateFormat ("yyMMddHHmmss");

        private static PrintStream TheStream = System.err;

        private static int TheLevel = VERBOSE;

        /**     Set log level. Default level is VERBOSE.
        */
        public static void setLevel (int lvl) {
                TheLevel = lvl;
        }

        private static void doPrint (
                String pref, Object that, String msg, Throwable ex
        ) {
                StringBuffer buf = new StringBuffer (128);
                buf.append (pref).
                        append (' ').
                        append (TheFormat.format (new Date ())).
                        append (' ');
                if (null != that) {
                        buf.append ('[').
                                append (that).
                                append (']');
                }
                if (null != msg) {
                        if (null != that) {
                                buf.append (": ");
                        }
                        buf.append (msg);
                }
                if (null != ex) {
                        if (null != that || null != msg) {
                                buf.append (": ");
                        }
                }
                synchronized (TheStream) {
                        TheStream.print (buf.toString ());
                        if (null != ex) {
                                ex.printStackTrace (TheStream);
                        }
                        else {
                                TheStream.println ();
                        }
                }
        }

        /**     Log a verbose message.
        */
        public static void verbose (Object module, String msg, Throwable ex) {
                if (VERBOSE <= TheLevel) {
                        doPrint ("    ", module, msg, ex);
                }
        }

        /**     Log an info message.
        */
        public static void info (Object module, String msg, Throwable ex) {
                if (INFO <= TheLevel) {
                        doPrint ("*** ", module, msg, ex);
                }
        }

        /**     Log a warning.
        */
        public static void warn (Object module, String msg, Throwable ex) {
                if (WARN <= TheLevel) {
                        doPrint ("WARN", module, msg, ex);
                }
        }

        /**     Log an error.
        */
        public static void error (Object module, String msg, Throwable ex) {
                if (ERROR <= TheLevel) {
                        doPrint ("ERR ", module, msg, ex);
                }
        }

/*
        Tester
        public static void main (String argv[]) {
                error (new Object (), "error", new Error ("fatal"));
                warn (null, "warning", null);
                info (null, null, null);
                verbose (new Exception (), null, new Exception ());
        }
*/
}

1	/*
2	openisis - an open implementation of the CDS/ISIS database
3	Version 0.8.x (patchlevel see file Version)
4	Copyright (C) 2001-2003 by Erik Grziwotz, erik@openisis.org
5
6	This library is free software; you can redistribute it and/or
7	modify it under the terms of the GNU Lesser General Public
8	License as published by the Free Software Foundation; either
9	version 2.1 of the License, or (at your option) any later version.
10
11	This library is distributed in the hope that it will be useful,
12	but WITHOUT ANY WARRANTY; without even the implied warranty of
13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14	Lesser General Public License for more details.
15
16	You should have received a copy of the GNU Lesser General Public
17	License along with this library; if not, write to the Free Software
18	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19
20	see README for more information
21	EOH */
22
23	package org.openisis;
24
25	import java.io.*;
26	import java.util.Date;
27	import java.text.SimpleDateFormat;
28
29	/**
30	Logger.
31	<p>
32	$Id: Log.java,v 1.1 2003/04/12 14:48:21 mawag Exp $
33	@version $Revision: 1.1 $
34	@author $Author: mawag $
35	*/
36	public class Log {
37
38	/** Error log level */
39	public static final int ERROR = 1;
40	/** Warning log level */
41	public static final int WARN = ERROR + 1;
42	/** Info log level */
43	public static final int INFO = WARN + 1;
44	/** Verbose log level */
45	public static final int VERBOSE = INFO + 1;
46
47	private static SimpleDateFormat TheFormat =
48	new SimpleDateFormat ("yyMMddHHmmss");
49
50	private static PrintStream TheStream = System.err;
51
52	private static int TheLevel = VERBOSE;
53
54	/** Set log level. Default level is VERBOSE.
55	*/
56	public static void setLevel (int lvl) {
57	TheLevel = lvl;
58	}
59
60	private static void doPrint (
61	String pref, Object that, String msg, Throwable ex
62	) {
63	StringBuffer buf = new StringBuffer (128);
64	buf.append (pref).
65	append (' ').
66	append (TheFormat.format (new Date ())).
67	append (' ');
68	if (null != that) {
69	buf.append ('[').
70	append (that).
71	append (']');
72	}
73	if (null != msg) {
74	if (null != that) {
75	buf.append (": ");
76	}
77	buf.append (msg);
78	}
79	if (null != ex) {
80	if (null != that \|\| null != msg) {
81	buf.append (": ");
82	}
83	}
84	synchronized (TheStream) {
85	TheStream.print (buf.toString ());
86	if (null != ex) {
87	ex.printStackTrace (TheStream);
88	}
89	else {
90	TheStream.println ();
91	}
92	}
93	}
94
95	/** Log a verbose message.
96	*/
97	public static void verbose (Object module, String msg, Throwable ex) {
98	if (VERBOSE <= TheLevel) {
99	doPrint (" ", module, msg, ex);
100	}
101	}
102
103	/** Log an info message.
104	*/
105	public static void info (Object module, String msg, Throwable ex) {
106	if (INFO <= TheLevel) {
107	doPrint ("*** ", module, msg, ex);
108	}
109	}
110
111	/** Log a warning.
112	*/
113	public static void warn (Object module, String msg, Throwable ex) {
114	if (WARN <= TheLevel) {
115	doPrint ("WARN", module, msg, ex);
116	}
117	}
118
119	/** Log an error.
120	*/
121	public static void error (Object module, String msg, Throwable ex) {
122	if (ERROR <= TheLevel) {
123	doPrint ("ERR ", module, msg, ex);
124	}
125	}
126
127	/*
128	Tester
129	public static void main (String argv[]) {
130	error (new Object (), "error", new Error ("fatal"));
131	warn (null, "warning", null);
132	info (null, null, null);
133	verbose (new Exception (), null, new Exception ());
134	}
135	*/
136	}
137