1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 /*
19 */
20 package org.apache.log4j.chainsaw;
21
22 import java.util.Collection;
23 import java.util.Collections;
24 import java.util.HashSet;
25 import java.util.Set;
26
27 import javax.swing.event.EventListenerList;
28
29
30 /**
31 * An implementation of LoggerNameModel which can be used as a delegate
32 *
33 * @author Paul Smith <psmith@apache.org>
34 */
35 public class LoggerNameModelSupport implements LoggerNameModel {
36
37 private Set loggerNameSet = new HashSet();
38 private EventListenerList listenerList = new EventListenerList();
39
40
41 /* (non-Javadoc)
42 * @see org.apache.log4j.chainsaw.LoggerNameModel#getLoggerNames()
43 */
44 public Collection getLoggerNames() {
45 return Collections.unmodifiableSet(loggerNameSet);
46 }
47
48 /* (non-Javadoc)
49 * @see org.apache.log4j.chainsaw.LoggerNameModel#addLoggerName(java.lang.String)
50 */
51 public boolean addLoggerName(String loggerName) {
52 boolean isNew = loggerNameSet.add(loggerName);
53
54 if(isNew)
55 {
56 notifyListeners(loggerName);
57 }
58
59 return isNew;
60 }
61
62 public void reset() {
63 loggerNameSet.clear();
64 LoggerNameListener[] eventListeners = (LoggerNameListener[]) listenerList.getListeners(LoggerNameListener.class);
65
66 for (int i = 0; i < eventListeners.length; i++)
67 {
68 LoggerNameListener listener = eventListeners[i];
69 listener.reset();
70 }
71 }
72
73 /**
74 * Notifies all the registered listeners that a new unique
75 * logger name has been added to this model
76 * @param loggerName
77 */
78 private void notifyListeners(String loggerName)
79 {
80 LoggerNameListener[] eventListeners = (LoggerNameListener[]) listenerList.getListeners(LoggerNameListener.class);
81
82 for (int i = 0; i < eventListeners.length; i++)
83 {
84 LoggerNameListener listener = eventListeners[i];
85 listener.loggerNameAdded(loggerName);
86 }
87 }
88
89 /* (non-Javadoc)
90 * @see org.apache.log4j.chainsaw.LoggerNameModel#addLoggerNameListener(org.apache.log4j.chainsaw.LoggerNameListener)
91 */
92 public void addLoggerNameListener(LoggerNameListener l) {
93 listenerList.add(LoggerNameListener.class, l);
94 }
95
96 /* (non-Javadoc)
97 * @see org.apache.log4j.chainsaw.LoggerNameModel#removeLoggerNameListener(org.apache.log4j.chainsaw.LoggerNameListener)
98 */
99 public void removeLoggerNameListener(LoggerNameListener l) {
100 listenerList.remove(LoggerNameListener.class, l);
101 }
102 }