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Java > Open Source Codes > org > apache > commons > logging > impl > Jdk14Logger


1 /*
2  * Copyright 2001-2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * 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,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16
17
18 package org.apache.commons.logging.impl;
19
20
21 import java.io.Serializable JavaDoc;
22 import java.util.logging.Level JavaDoc;
23 import java.util.logging.Logger JavaDoc;
24
25 import org.apache.commons.logging.Log;
26
27
28 /**
29  * <p>Implementation of the <code>org.apache.commons.logging.Log</code>
30  * interface that wraps the standard JDK logging mechanisms that were
31  * introduced in the Merlin release (JDK 1.4).</p>
32  *
33  * @author <a HREF="mailto:sanders@apache.org">Scott Sanders</a>
34  * @author <a HREF="mailto:bloritsch@apache.org">Berin Loritsch</a>
35  * @author <a HREF="mailto:donaldp@apache.org">Peter Donald</a>
36  * @version $Revision: 370652 $ $Date: 2006-01-19 22:23:48 +0000 (Thu, 19 Jan 2006) $
37  */
38
39 public class Jdk14Logger implements Log, Serializable JavaDoc {
40
41     /**
42      * This member variable simply ensures that any attempt to initialise
43      * this class in a pre-1.4 JVM will result in an ExceptionInInitializerError.
44      * It must not be private, as an optimising compiler could detect that it
45      * is not used and optimise it away.
46      */
47     protected static final Level JavaDoc dummyLevel = Level.FINE;
48
49     // ----------------------------------------------------------- Constructors
50
51
52     /**
53      * Construct a named instance of this Logger.
54      *
55      * @param name Name of the logger to be constructed
56      */
57     public Jdk14Logger(String JavaDoc name) {
58
59         this.name = name;
60         logger = getLogger();
61
62     }
63
64
65     // ----------------------------------------------------- Instance Variables
66
67
68     /**
69      * The underlying Logger implementation we are using.
70      */
71     protected transient Logger JavaDoc logger = null;
72
73
74     /**
75      * The name of the logger we are wrapping.
76      */
77     protected String JavaDoc name = null;
78
79
80     // --------------------------------------------------------- Public Methods
81
82     private void log( Level JavaDoc level, String JavaDoc msg, Throwable JavaDoc ex ) {
83
84         Logger JavaDoc logger = getLogger();
85         if (logger.isLoggable(level)) {
86             // Hack (?) to get the stack trace.
87 Throwable JavaDoc dummyException=new Throwable JavaDoc();
88             StackTraceElement JavaDoc locations[]=dummyException.getStackTrace();
89             // Caller will be the third element
90 String JavaDoc cname="unknown";
91             String JavaDoc method="unknown";
92             if( locations!=null && locations.length >2 ) {
93                 StackTraceElement JavaDoc caller=locations[2];
94                 cname=caller.getClassName();
95                 method=caller.getMethodName();
96             }
97             if( ex==null ) {
98                 logger.logp( level, cname, method, msg );
99             } else {
100                 logger.logp( level, cname, method, msg, ex );
101             }
102         }
103
104     }
105
106     /**
107      * Logs a message with <code>java.util.logging.Level.FINE</code>.
108      *
109      * @param message to log
110      * @see org.apache.commons.logging.Log#debug(Object)
111      */
112     public void debug(Object JavaDoc message) {
113         log(Level.FINE, String.valueOf(message), null);
114     }
115
116
117     /**
118      * Logs a message with <code>java.util.logging.Level.FINE</code>.
119      *
120      * @param message to log
121      * @param exception log this cause
122      * @see org.apache.commons.logging.Log#debug(Object, Throwable)
123      */
124     public void debug(Object JavaDoc message, Throwable JavaDoc exception) {
125         log(Level.FINE, String.valueOf(message), exception);
126     }
127
128
129     /**
130      * Logs a message with <code>java.util.logging.Level.SEVERE</code>.
131      *
132      * @param message to log
133      * @see org.apache.commons.logging.Log#error(Object)
134      */
135     public void error(Object JavaDoc message) {
136         log(Level.SEVERE, String.valueOf(message), null);
137     }
138
139
140     /**
141      * Logs a message with <code>java.util.logging.Level.SEVERE</code>.
142      *
143      * @param message to log
144      * @param exception log this cause
145      * @see org.apache.commons.logging.Log#error(Object, Throwable)
146      */
147     public void error(Object JavaDoc message, Throwable JavaDoc exception) {
148         log(Level.SEVERE, String.valueOf(message), exception);
149     }
150
151
152     /**
153      * Logs a message with <code>java.util.logging.Level.SEVERE</code>.
154      *
155      * @param message to log
156      * @see org.apache.commons.logging.Log#fatal(Object)
157      */
158     public void fatal(Object JavaDoc message) {
159         log(Level.SEVERE, String.valueOf(message), null);
160     }
161
162
163     /**
164      * Logs a message with <code>java.util.logging.Level.SEVERE</code>.
165      *
166      * @param message to log
167      * @param exception log this cause
168      * @see org.apache.commons.logging.Log#fatal(Object, Throwable)
169      */
170     public void fatal(Object JavaDoc message, Throwable JavaDoc exception) {
171         log(Level.SEVERE, String.valueOf(message), exception);
172     }
173
174
175     /**
176      * Return the native Logger instance we are using.
177      */
178     public Logger JavaDoc getLogger() {
179         if (logger == null) {
180             logger = Logger.getLogger(name);
181         }
182         return (logger);
183     }
184
185
186     /**
187      * Logs a message with <code>java.util.logging.Level.INFO</code>.
188      *
189      * @param message to log
190      * @see org.apache.commons.logging.Log#info(Object)
191      */
192     public void info(Object JavaDoc message) {
193         log(Level.INFO, String.valueOf(message), null);
194     }
195
196
197     /**
198      * Logs a message with <code>java.util.logging.Level.INFO</code>.
199      *
200      * @param message to log
201      * @param exception log this cause
202      * @see org.apache.commons.logging.Log#info(Object, Throwable)
203      */
204     public void info(Object JavaDoc message, Throwable JavaDoc exception) {
205         log(Level.INFO, String.valueOf(message), exception);
206     }
207
208
209     /**
210      * Is debug logging currently enabled?
211      */
212     public boolean isDebugEnabled() {
213         return (getLogger().isLoggable(Level.FINE));
214     }
215
216
217     /**
218      * Is error logging currently enabled?
219      */
220     public boolean isErrorEnabled() {
221         return (getLogger().isLoggable(Level.SEVERE));
222     }
223
224
225     /**
226      * Is fatal logging currently enabled?
227      */
228     public boolean isFatalEnabled() {
229         return (getLogger().isLoggable(Level.SEVERE));
230     }
231
232
233     /**
234      * Is info logging currently enabled?
235      */
236     public boolean isInfoEnabled() {
237         return (getLogger().isLoggable(Level.INFO));
238     }
239
240
241     /**
242      * Is trace logging currently enabled?
243      */
244     public boolean isTraceEnabled() {
245         return (getLogger().isLoggable(Level.FINEST));
246     }
247
248
249     /**
250      * Is warn logging currently enabled?
251      */
252     public boolean isWarnEnabled() {
253         return (getLogger().isLoggable(Level.WARNING));
254     }
255
256
257     /**
258      * Logs a message with <code>java.util.logging.Level.FINEST</code>.
259      *
260      * @param message to log
261      * @see org.apache.commons.logging.Log#trace(Object)
262      */
263     public void trace(Object JavaDoc message) {
264         log(Level.FINEST, String.valueOf(message), null);
265     }
266
267
268     /**
269      * Logs a message with <code>java.util.logging.Level.FINEST</code>.
270      *
271      * @param message to log
272      * @param exception log this cause
273      * @see org.apache.commons.logging.Log#trace(Object, Throwable)
274      */
275     public void trace(Object JavaDoc message, Throwable JavaDoc exception) {
276         log(Level.FINEST, String.valueOf(message), exception);
277     }
278
279
280     /**
281      * Logs a message with <code>java.util.logging.Level.WARNING</code>.
282      *
283      * @param message to log
284      * @see org.apache.commons.logging.Log#warn(Object)
285      */
286     public void warn(Object JavaDoc message) {
287         log(Level.WARNING, String.valueOf(message), null);
288     }
289
290
291     /**
292      * Logs a message with <code>java.util.logging.Level.WARNING</code>.
293      *
294      * @param message to log
295      * @param exception log this cause
296      * @see org.apache.commons.logging.Log#warn(Object, Throwable)
297      */
298     public void warn(Object JavaDoc message, Throwable JavaDoc exception) {
299         log(Level.WARNING, String.valueOf(message), exception);
300     }
301
302
303 }
304
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