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Java > Open Source Codes > org > jfree > base > log > DefaultLogModule


1 /* ========================================================================
2  * JCommon : a free general purpose class library for the Java(tm) platform
3  * ========================================================================
4  *
5  * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
6  *
7  * Project Info: http://www.jfree.org/jcommon/index.html
8  *
9  * This library is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU Lesser General Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17  * License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22  * USA.
23  *
24  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
25  * in the United States and other countries.]
26  *
27  * ---------------------
28  * DefaultLogModule.java
29  * ---------------------
30  * (C)opyright 2003, 2004, by Thomas Morgner and Contributors.
31  *
32  * Original Author: Thomas Morgner;
33  * Contributor(s): David Gilbert (for Object Refinery Limited);
34  *
35  * $Id: DefaultLogModule.java,v 1.8 2005/12/18 23:29:18 taqua Exp $
36  *
37  * Changes
38  * -------
39  * 11-Jul-2003 : Initial version
40  * 07-Jun-2004 : Added JCommon header (DG);
41  * 25-Nov-2005 : The initialization was overly complicated. There is only
42  * one logtarget here, and additional targets should create
43  * an dependent module.
44  */
45
46 package org.jfree.base.log;
47
48 import org.jfree.base.modules.AbstractModule;
49 import org.jfree.base.modules.ModuleInitializeException;
50 import org.jfree.base.modules.SubSystem;
51 import org.jfree.util.Log;
52 import org.jfree.util.PrintStreamLogTarget;
53
54 /**
55  * The module definition for the System.out-Logging. This is the default log
56  * implementation and is provided to insert the logging initialisation in the
57  * module loading process.
58  *
59  * @author Thomas Morgner
60  */
61 public class DefaultLogModule extends AbstractModule
62 {
63   /**
64    * DefaultConstructor. Loads the module specification.
65    *
66    * @throws ModuleInitializeException if an error occured.
67    */
68   public DefaultLogModule() throws ModuleInitializeException
69   {
70     loadModuleInfo();
71   }
72
73   /**
74    * Initalizes the module. This method initializes the logging system, if the
75    * System.out logtarget is selected.
76    *
77    * @param subSystem the sub-system.
78    * @throws ModuleInitializeException if an error occured.
79    */
80   public void initialize(final SubSystem subSystem)
81           throws ModuleInitializeException
82   {
83     if (LogConfiguration.isDisableLogging())
84     {
85       return;
86     }
87
88     if (LogConfiguration.getLogTarget().equals
89             (PrintStreamLogTarget.class.getName()))
90     {
91       DefaultLog.installDefaultLog();
92       Log.getInstance().addTarget(new PrintStreamLogTarget());
93
94       if ("true".equals(subSystem.getGlobalConfig().getConfigProperty
95               ("org.jfree.base.LogAutoInit")))
96       {
97         Log.getInstance().init();
98       }
99       Log.info("Default log target started ... previous log messages " +
100               "could have been ignored.");
101     }
102   }
103 }
104
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