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| 1 | /* | ||
| 2 | * Copyright (c) 2004, 2010, 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 | |||
| 26 | package sun.jvmstat.perfdata.monitor; | ||
| 27 | |||
| 28 | import sun.jvmstat.monitor.*; | ||
| 29 | import java.nio.ByteBuffer; | ||
| 30 | import java.nio.charset.Charset; | ||
| 31 | |||
| 32 | /** | ||
| 33 | * Class for monitoring a PerfData String instrument. | ||
| 34 | * | ||
| 35 | * @author Brian Doherty | ||
| 36 | * @since 1.5 | ||
| 37 | */ | ||
| 38 | public class PerfStringMonitor extends PerfByteArrayMonitor | ||
| 39 | implements StringMonitor { | ||
| 40 | |||
| 41 | private static Charset defaultCharset = Charset.defaultCharset(); | ||
| 42 | |||
| 43 | /** | ||
| 44 | * Constructor to create a StringMonitor object for the string instrument | ||
| 45 | * represented by the data in the given buffer. | ||
| 46 | * | ||
| 47 | * @param name the name of the string instrument | ||
| 48 | * @param v the variability attribute | ||
| 49 | * @param supported support level indicator | ||
| 50 | * @param bb the buffer containing the string instrument data. | ||
| 51 | */ | ||
| 52 | public PerfStringMonitor(String name, Variability v, boolean supported, | ||
| 53 | ByteBuffer bb) { | ||
| 54 | this(name, v, supported, bb, bb.limit()); | ||
| 55 | } | ||
| 56 | |||
| 57 | /** | ||
| 58 | * Constructor to create a StringMonitor object for the string instrument | ||
| 59 | * represented by the data in the given buffer. | ||
| 60 | * | ||
| 61 | * @param name the name of the string instrument | ||
| 62 | * @param v the variability attribute | ||
| 63 | * @param supported support level indicator | ||
| 64 | * @param bb the buffer containing the string instrument data. | ||
| 65 | * @param maxLength the maximum length of the string data. | ||
| 66 | */ | ||
| 67 | public PerfStringMonitor(String name, Variability v, boolean supported, | ||
| 68 | ByteBuffer bb, int maxLength) { | ||
| 69 | super(name, Units.STRING, v, supported, bb, maxLength); | ||
| 70 | } | ||
| 71 | |||
| 72 | /** | ||
| 73 | * {@inheritDoc} | ||
| 74 | * The object returned contains a String with a copy of the current | ||
| 75 | * value of the StringInstrument. | ||
| 76 | * | ||
| 77 | * @return Object - a copy of the current value of the StringInstrument. | ||
| 78 | * The return value is guaranteed to be of type String. | ||
| 79 | */ | ||
| 80 | public Object getValue() { | ||
| 81 | return stringValue(); | ||
| 82 | } | ||
| 83 | |||
| 84 | /** | ||
| 85 | * Return the current value of the StringInstrument as a String. | ||
| 86 | * | ||
| 87 | * @return String - a copy of the current value of the StringInstrument. | ||
| 88 | */ | ||
| 89 | public String stringValue() { | ||
| 90 | String str = ""; | ||
| 91 | byte[] b = byteArrayValue(); | ||
| 92 | |||
| 93 | // catch null strings | ||
| 94 | if ((b == null) || (b.length <= 1) || (b[0] == (byte)0)) { | ||
| 95 | return str; | ||
| 96 | } | ||
| 97 | |||
| 98 | int i; | ||
| 99 | for (i = 0; i < b.length && b[i] != (byte)0; i++); | ||
| 100 | |||
| 101 | return new String(b, 0, i, defaultCharset); | ||
| 102 | } | ||
| 103 | } | ||