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Java > Open Source Codes > com > jeantessier > metrics > CounterMeasurement


1 /*
2  * Copyright (c) 2001-2005, Jean Tessier
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  *
9  * * Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  *
12  * * Redistributions in binary form must reproduce the above copyright
13  * notice, this list of conditions and the following disclaimer in the
14  * documentation and/or other materials provided with the distribution.
15  *
16  * * Neither the name of Jean Tessier nor the names of his contributors
17  * may be used to endorse or promote products derived from this software
18  * without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR
24  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
27  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
28  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31  */
32
33 package com.jeantessier.metrics;
34
35 /**
36  * <p>A simple counter, it tallies the values that are put in it.
37  * If you try to add a non-number, it simply adds 1.</p>
38  *
39  * <p>This is the syntax for initializing this type of
40  * measurement:</p>
41  *
42  * <pre>
43  * &lt;init&gt;
44  * [initial value]
45  * &lt;/init&gt;
46  * </pre>
47  */
48 public class CounterMeasurement extends MeasurementBase {
49     private double value;
50
51     public CounterMeasurement(MeasurementDescriptor descriptor, Metrics context, String JavaDoc initText) {
52         super(descriptor, context, initText);
53
54         try {
55             if (initText != null) {
56                 value = Double.parseDouble(initText);
57             }
58         } catch (NumberFormatException JavaDoc ex) {
59             value = 0;
60         }
61     }
62
63     public void add(Object JavaDoc object) {
64         if (object instanceof Number JavaDoc) {
65             value += ((Number JavaDoc) object).doubleValue();
66         } else {
67             value++;
68         }
69
70         setEmpty(false);
71     }
72
73     public void add(int i) {
74         value += i;
75         setEmpty(false);
76     }
77     
78     public void add(long l) {
79         value += l;
80         setEmpty(false);
81     }
82     
83     public void add(float f) {
84         value += f;
85         setEmpty(false);
86     }
87     
88     public void add(double d) {
89         value += d;
90         setEmpty(false);
91     }
92
93     public void accept(MeasurementVisitor visitor) {
94         visitor.visitCounterMeasurement(this);
95     }
96
97     protected double compute() {
98         return value;
99     }
100 }
101
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