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| 1 | /* | ||
| 2 | * Copyright (c) 2003, 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.monitor; | ||
| 27 | |||
| 28 | /** | ||
| 29 | * Provides a typesafe enumeration for the Variability attribute for | ||
| 30 | * instrumentation objects. | ||
| 31 | * | ||
| 32 | * @author Brian Doherty | ||
| 33 | */ | ||
| 34 | public class Variability implements java.io.Serializable { | ||
| 35 | |||
| 36 | /* The enumeration values for this typesafe enumeration must be | ||
| 37 | * kept in synchronization with the Variability enum in the perfData.hpp file | ||
| 38 | * in the HotSpot source base. | ||
| 39 | */ | ||
| 40 | |||
| 41 | private static final int NATTRIBUTES = 4; | ||
| 42 | private static Variability[] map = new Variability[NATTRIBUTES]; | ||
| 43 | |||
| 44 | private String name; | ||
| 45 | private int value; | ||
| 46 | |||
| 47 | /** | ||
| 48 | * An invalid Variablity value. | ||
| 49 | */ | ||
| 50 | public static final Variability INVALID = new Variability("Invalid",0); | ||
| 51 | |||
| 52 | /** | ||
| 53 | * Variability attribute representing Constant counters. | ||
| 54 | */ | ||
| 55 | public static final Variability CONSTANT = new Variability("Constant",1); | ||
| 56 | |||
| 57 | /** | ||
| 58 | * Variability attribute representing a Monotonically changing counters. | ||
| 59 | */ | ||
| 60 | public static final Variability MONOTONIC = new Variability("Monotonic",2); | ||
| 61 | |||
| 62 | /** | ||
| 63 | * Variability attribute representing Variable counters. | ||
| 64 | */ | ||
| 65 | public static final Variability VARIABLE = new Variability("Variable",3); | ||
| 66 | |||
| 67 | /** | ||
| 68 | * Returns a string describing this Variability attribute. | ||
| 69 | * | ||
| 70 | * @return String - a descriptive string for this enum. | ||
| 71 | */ | ||
| 72 | public String toString() { | ||
| 73 | return name; | ||
| 74 | } | ||
| 75 | |||
| 76 | /** | ||
| 77 | * Returns the integer representation of this Variability attribute. | ||
| 78 | * | ||
| 79 | * @return int - an integer representation of this Variability attribute. | ||
| 80 | */ | ||
| 81 | public int intValue() { | ||
| 82 | return value; | ||
| 83 | } | ||
| 84 | |||
| 85 | /** | ||
| 86 | * Maps an integer value its corresponding Variability attribute. | ||
| 87 | * If the integer value does not have a corresponding Variability enum | ||
| 88 | * value, the {@link Variability#INVALID} is returned | ||
| 89 | * | ||
| 90 | * @param value an integer representation of a Variability attribute | ||
| 91 | * @return Variability - The Variability object for the given | ||
| 92 | * <code>value</code> or {@link Variability#INVALID} | ||
| 93 | * if out of range. | ||
| 94 | */ | ||
| 95 | public static Variability toVariability(int value) { | ||
| 96 | |||
| 97 | if (value < 0 || value >= map.length || map[value] == null) { | ||
| 98 | return INVALID; | ||
| 99 | } | ||
| 100 | |||
| 101 | return map[value]; | ||
| 102 | } | ||
| 103 | |||
| 104 | private Variability(String name, int value) { | ||
| 105 | this.name = name; | ||
| 106 | this.value = value; | ||
| 107 | map[value]=this; | ||
| 108 | } | ||
| 109 | |||
| 110 | private static final long serialVersionUID = 6992337162326171013L; | ||
| 111 | } | ||