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Java > Open Source Codes > org > apache > avalon > framework > logger > NullLogger


1 /* ====================================================================
2  * The Apache Software License, Version 1.1
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8  * modification, are permitted provided that the following conditions
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17  * distribution.
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24  * itself, if and wherever such third-party acknowledgments
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55 package org.apache.avalon.framework.logger;
56
57 /**
58  * The Null Logger class. This is useful for implementations where you need
59  * to provide a logger to a utility class, but do not want any output from it.
60  * It also helps when you have a utility that does not have a logger to supply.
61  *
62  * @author <a HREF="mailto:dev@avalon.apache.org">Avalon Development Team</a>
63  * @version CVS $Revision: 1.11 $ $Date: 2003/02/11 15:58:41 $
64  */
65 public final class NullLogger implements Logger
66 {
67     /**
68      * Creates a new <code>NullLogger</code>.
69      */
70     public NullLogger()
71     {
72     }
73
74     /**
75      * No-op.
76      *
77      * @param message ignored
78      */
79     public void debug( String JavaDoc message )
80     {
81     }
82
83     /**
84      * No-op.
85      *
86      * @param message ignored
87      * @param throwable ignored
88      */
89     public void debug( String JavaDoc message, Throwable JavaDoc throwable )
90     {
91     }
92
93     /**
94      * No-op.
95      *
96      * @return <code>false</code>
97      */
98     public boolean isDebugEnabled()
99     {
100         return false;
101     }
102
103     /**
104      * No-op.
105      *
106      * @param message ignored
107      */
108     public void info( String JavaDoc message )
109     {
110     }
111
112     /**
113      * No-op.
114      *
115      * @param message ignored
116      * @param throwable ignored
117      */
118     public void info( String JavaDoc message, Throwable JavaDoc throwable )
119     {
120     }
121
122     /**
123      * No-op.
124      *
125      * @return <code>false</code>
126      */
127     public boolean isInfoEnabled()
128     {
129         return false;
130     }
131
132     /**
133      * No-op.
134      *
135      * @param message ignored
136      */
137     public void warn( String JavaDoc message )
138     {
139     }
140
141     /**
142      * No-op.
143      *
144      * @param message ignored
145      * @param throwable ignored
146      */
147     public void warn( String JavaDoc message, Throwable JavaDoc throwable )
148     {
149     }
150
151     /**
152      * No-op.
153      *
154      * @return <code>false</code>
155      */
156     public boolean isWarnEnabled()
157     {
158         return false;
159     }
160
161     /**
162      * No-op.
163      *
164      * @param message ignored
165      */
166     public void error( String JavaDoc message )
167     {
168     }
169
170     /**
171      * No-op.
172      *
173      * @param message ignored
174      * @param throwable ignored
175      */
176     public void error( String JavaDoc message, Throwable JavaDoc throwable )
177     {
178     }
179
180     /**
181      * No-op.
182      *
183      * @return <code>false</code>
184      */
185     public boolean isErrorEnabled()
186     {
187         return false;
188     }
189
190     /**
191      * No-op.
192      *
193      * @param message ignored
194      */
195     public void fatalError( String JavaDoc message )
196     {
197     }
198
199     /**
200      * No-op.
201      *
202      * @param message ignored
203      * @param throwable ignored
204      */
205     public void fatalError( String JavaDoc message, Throwable JavaDoc throwable )
206     {
207     }
208
209     /**
210      * No-op.
211      *
212      * @return <code>false</code>
213      */
214     public boolean isFatalErrorEnabled()
215     {
216         return false;
217     }
218
219     /**
220      * Returns this <code>NullLogger</code>.
221      *
222      * @param name ignored
223      * @return this <code>NullLogger</code>
224      */
225     public Logger getChildLogger( String JavaDoc name )
226     {
227         return this;
228     }
229 }
230
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