001: /*
002: * Copyright 2003-2004 Sun Microsystems, Inc. All Rights Reserved.
003: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004: *
005: * This code is free software; you can redistribute it and/or modify it
006: * under the terms of the GNU General Public License version 2 only, as
007: * published by the Free Software Foundation. Sun designates this
008: * particular file as subject to the "Classpath" exception as provided
009: * by Sun in the LICENSE file that accompanied this code.
010: *
011: * This code is distributed in the hope that it will be useful, but WITHOUT
012: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
014: * version 2 for more details (a copy is included in the LICENSE file that
015: * accompanied this code).
016: *
017: * You should have received a copy of the GNU General Public License version
018: * 2 along with this work; if not, write to the Free Software Foundation,
019: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020: *
021: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022: * CA 95054 USA or visit www.sun.com if you need additional information or
023: * have any questions.
024: */
025:
026: package sun.management.counter;
027:
028: /**
029: * Provides a typesafe enumeration for the Variability attribute for
030: * instrumentation objects.
031: *
032: * @author Brian Doherty
033: * @version 1.11, 05/05/07
034: */
035: public class Variability implements java.io.Serializable {
036:
037: /* The enumeration values for this typesafe enumeration must be
038: * kept in synchronization with the Variability enum in the perfData.hpp file
039: * in the HotSpot source base.
040: */
041:
042: private static final int NATTRIBUTES = 4;
043: private static Variability[] map = new Variability[NATTRIBUTES];
044:
045: private String name;
046: private int value;
047:
048: /**
049: * An invalid Variablity value.
050: */
051: public static final Variability INVALID = new Variability(
052: "Invalid", 0);
053:
054: /**
055: * Variability attribute representing Constant counters.
056: */
057: public static final Variability CONSTANT = new Variability(
058: "Constant", 1);
059:
060: /**
061: * Variability attribute representing a Monotonically changing counters.
062: */
063: public static final Variability MONOTONIC = new Variability(
064: "Monotonic", 2);
065:
066: /**
067: * Variability attribute representing Variable counters.
068: */
069: public static final Variability VARIABLE = new Variability(
070: "Variable", 3);
071:
072: /**
073: * Returns a string describing this Variability attribute.
074: *
075: * @return String - a descriptive string for this enum.
076: */
077: public String toString() {
078: return name;
079: }
080:
081: /**
082: * Returns the integer representation of this Variability attribute.
083: *
084: * @return int - an integer representation of this Variability attribute.
085: */
086: public int intValue() {
087: return value;
088: }
089:
090: /**
091: * Maps an integer value its corresponding Variability attribute.
092: * If the integer value does not have a corresponding Variability enum
093: * value, the {@link Variability#INVALID} is returned
094: *
095: * @param value an integer representation of a Variability attribute
096: * @return Variability - The Variability object for the given
097: * <code>value</code> or {@link Variability#INVALID}
098: * if out of range.
099: */
100: public static Variability toVariability(int value) {
101:
102: if (value < 0 || value >= map.length || map[value] == null) {
103: return INVALID;
104: }
105:
106: return map[value];
107: }
108:
109: private Variability(String name, int value) {
110: this .name = name;
111: this .value = value;
112: map[value] = this ;
113: }
114:
115: private static final long serialVersionUID = 6992337162326171013L;
116: }
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