1/*
2 * Copyright (c) 2003, 2006, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package sun.management.counter.perf;
27
28import sun.management.counter.*;
29import java.nio.ByteBuffer;
30import java.nio.ReadOnlyBufferException;
31import java.nio.charset.Charset;
32
33public class PerfStringCounter extends PerfByteArrayCounter
34    implements StringCounter {
35
36    private static Charset defaultCharset = Charset.defaultCharset();
37    PerfStringCounter(String name, Variability v,
38                      int flags, ByteBuffer bb) {
39        this(name, v, flags, bb.limit(), bb);
40    }
41
42    PerfStringCounter(String name, Variability v, int flags,
43                      int maxLength, ByteBuffer bb) {
44
45        super(name, Units.STRING, v, flags, maxLength, bb);
46    }
47
48    // override isVector and getVectorLength in ByteArrayCounter
49    public boolean isVector() {
50        return false;
51    }
52
53    public int getVectorLength() {
54        return 0;
55    }
56
57    public Object getValue() {
58        return stringValue();
59    }
60
61    public String stringValue() {
62
63        String str = "";
64        byte[] b = byteArrayValue();
65
66        if (b == null || b.length <= 1) {
67            return str;
68        }
69
70        int i;
71        for (i = 0; i < b.length && b[i] != (byte)0; i++);
72
73        // convert byte array to string, using all bytes up to, but
74        // not including the first null byte.
75        return new String(b , 0, i, defaultCharset);
76    }
77
78    /**
79     * Serialize as a snapshot object.
80     */
81    protected Object writeReplace() throws java.io.ObjectStreamException {
82        return new StringCounterSnapshot(getName(),
83                                         getUnits(),
84                                         getVariability(),
85                                         getFlags(),
86                                         stringValue());
87    }
88
89    private static final long serialVersionUID = 6802913433363692452L;
90}
91