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 26package sun.jvmstat.monitor; 27 28/** 29 * Provides a typesafe enumeration for the Variability attribute for 30 * instrumentation objects. 31 * 32 * @author Brian Doherty 33 */ 34public 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} 112