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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 | +} | |