DefaultLogTargetManager


1   /* 
2    * Copyright 2004 Apache Software Foundation
3    * Licensed  under the  Apache License,  Version 2.0  (the "License");
4    * you may not use  this file  except in  compliance with the License.
5    * You may obtain a copy of the License at 
6    * 
7    *   http://www.apache.org/licenses/LICENSE-2.0
8    * 
9    * Unless required by applicable law or agreed to in writing, software
10   * distributed  under the  License is distributed on an "AS IS" BASIS,
11   * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY KIND, either  express  or
12   * implied.
13   * 
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.avalon.logging.logkit;
19  
20  import java.util.Map  ;
21  
22  import org.apache.avalon.util.i18n.ResourceManager;
23  import org.apache.avalon.util.i18n.Resources;
24  
25  import org.apache.log.LogTarget;
26  
27  /**
28   * A <code>LoggerManager</code> interface declares operation supporting
29   * the management of a logging hierarchy.
30   *
31   * @author <a HREF="mailto:dev@avalon.apache.org">Avalon Development Team</a>
32   */
33  class DefaultLogTargetManager implements LogTargetManager
34  {
35      //---------------------------------------------------------------
36      // static
37      //---------------------------------------------------------------
38  
39      private static final Resources REZ =
40        ResourceManager.getPackageResources( 
41          DefaultLogTargetManager.class );
42  
43      //---------------------------------------------------------------
44      // state
45      //---------------------------------------------------------------
46  
47     /** 
48      * Map for id to target mapping.
49      */
50      private final Map   m_targets;
51  
52      //---------------------------------------------------------------
53      // constructor
54      //---------------------------------------------------------------
55  
56      /**
57       * Creation of a new log target manager.
58       * @param targets a map of log targets
59       */
60      public DefaultLogTargetManager( Map   targets ) throws Exception  
61      {
62          if( null == targets )
63          {
64              throw new NullPointerException  ( "targets" );
65          }
66          m_targets = targets;
67      }
68  
69      //---------------------------------------------------------------
70      // LogTargetManager
71      //---------------------------------------------------------------
72      
73     /**
74      * Return a log target using a supplied target id.  If the 
75      * supplied id is unknown a null value is returned.
76      * @param id the logging target id
77      * @return the logging target
78      */
79      public LogTarget getLogTarget( final String   id )
80      {
81          return (LogTarget) m_targets.get( id );
82      }
83  }
84
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