1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
/*
* Copyright (c) 2004, 2006, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.jvmstat.perfdata.monitor;
import sun.jvmstat.monitor.*;
import sun.management.counter.Units;
import sun.management.counter.Variability;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
/**
* Class for monitoring a PerfData String instrument.
*
* @author Brian Doherty
* @since 1.5
*/
public class PerfStringMonitor extends PerfByteArrayMonitor
implements StringMonitor {
private static Charset defaultCharset = Charset.defaultCharset();
/**
* Constructor to create a StringMonitor object for the string instrument
* represented by the data in the given buffer.
*
* @param name the name of the string instrument
* @param v the variability attribute
* @param supported support level indicator
* @param bb the buffer containing the string instrument data.
*/
public PerfStringMonitor(String name, Variability v, boolean supported,
ByteBuffer bb) {
this(name, v, supported, bb, bb.limit());
}
/**
* Constructor to create a StringMonitor object for the string instrument
* represented by the data in the given buffer.
*
* @param name the name of the string instrument
* @param v the variability attribute
* @param supported support level indicator
* @param bb the buffer containing the string instrument data.
* @param maxLength the maximum length of the string data.
*/
public PerfStringMonitor(String name, Variability v, boolean supported,
ByteBuffer bb, int maxLength) {
super(name, Units.STRING, v, supported, bb, maxLength);
}
/**
* {@inheritDoc}
* The object returned contains a String with a copy of the current
* value of the StringInstrument.
*
* @return Object - a copy of the current value of the StringInstrument.
* The return value is guaranteed to be of type String.
*/
public Object getValue() {
return stringValue();
}
/**
* Return the current value of the StringInstrument as a String.
*
* @return String - a copy of the current value of the StringInstrument.
*/
public String stringValue() {
String str = "";
byte[] b = byteArrayValue();
// catch null strings
if ((b == null) || (b.length <= 1) || (b[0] == (byte)0)) {
return str;
}
int i;
for (i = 0; i < b.length && b[i] != (byte)0; i++);
return new String(b, 0, i, defaultCharset);
}
}
|
