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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  package org.apache.log4j.chainsaw;
19  
20  import java.util.Arrays;
21  import java.util.Collections;
22  import java.util.Comparator;
23  import java.util.Hashtable;
24  import java.util.Iterator;
25  import java.util.List;
26  
27  import javax.swing.DefaultBoundedRangeModel;
28  import javax.swing.JLabel;
29  import javax.swing.JSlider;
30  import javax.swing.SwingConstants;
31  
32  import org.apache.log4j.Level;
33  
34  
35  /**
36   * A Slider implementation that allows a user to
37   * choose a particular Threshold
38   * .
39   * @author Paul Smith <psmith@apache.org>
40   *
41   */
42  final class ThresholdSlider extends JSlider {
43    final List priorityList;
44  
45    ThresholdSlider() {
46      Level[] levels =
47        new Level[] {
48          Level.OFF, Level.FATAL, Level.ERROR, Level.WARN, Level.INFO,
49          Level.DEBUG, Level.TRACE, Level.ALL
50        };
51  
52      priorityList = Arrays.asList(levels);
53  
54      Collections.sort(
55        priorityList,
56        new Comparator() {
57          public int compare(Object o1, Object o2) {
58            Level p1 = (Level) o1;
59            Level p2 = (Level) o2;
60  
61            if (p1.toInt() == p2.toInt()) {
62              return 0;
63            } else if (p1.toInt() < p2.toInt()) {
64              return -1;
65            }
66  
67            return 1;
68          }
69        });
70  
71      setModel(
72        new DefaultBoundedRangeModel(
73          priorityList.indexOf(Level.TRACE), 0, 0, priorityList.size() - 1));
74  
75      Hashtable labelMap = new Hashtable();
76  
77      for (Iterator iter = priorityList.iterator(); iter.hasNext();) {
78        Level item = (Level) iter.next();
79        labelMap.put(
80          new Integer(priorityList.indexOf(item)), new JLabel(item.toString()));
81  
82        //      System.out.println("creating levels for :: " + item.toInt() + "," + item.toString());
83      }
84  
85      setOrientation(SwingConstants.VERTICAL);
86      setInverted(true);
87      setLabelTable(labelMap);
88  
89      setPaintLabels(true);
90  
91      //    setPaintTicks(true);
92      setSnapToTicks(true);
93  
94      //    setMajorTickSpacing(10000);
95      //    setPaintTrack(true);
96    }
97  
98    void setChosenLevel(Level level) {
99      setValue(priorityList.indexOf(level));
100   }
101 
102   /**
103    * Returns the Log4j Level that is currently selected in this slider
104    * @return
105    */
106   Level getSelectedLevel() {
107     Level level = (Level) priorityList.get(getValue());
108 
109     if (level == null) {
110       level = Level.TRACE;
111     }
112 
113     return level;
114   }
115 }