129 lines
4.0 KiB
Java
129 lines
4.0 KiB
Java
/*
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* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.jvmstat.monitor;
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/**
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* Provides a typesafe enumeration for describing units of measurement
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* attribute for instrumentation objects.
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*
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* @author Brian Doherty
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*/
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public class Units implements java.io.Serializable {
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/* The enumeration values for this typesafe enumeration must be
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* kept in synchronization with the Units enum in the perfData.hpp file
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* in the HotSpot source base.
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*/
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private static final int NUNITS=8;
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private static Units[] map = new Units[NUNITS];
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private final String name;
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private final int value;
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/**
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* An Invalid Units value.
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*/
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public static final Units INVALID = new Units("Invalid", 0);
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/**
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* Units attribute representing unit-less quantities.
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*/
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public static final Units NONE = new Units("None", 1);
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/**
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* Units attribute representing Bytes.
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*/
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public static final Units BYTES = new Units("Bytes", 2);
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/**
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* Units attribute representing Ticks.
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*/
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public static final Units TICKS = new Units("Ticks", 3);
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/**
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* Units attribute representing a count of events.
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*/
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public static final Units EVENTS = new Units("Events", 4);
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/**
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* Units attribute representing String data. Although not really
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* a unit of measure, this Units value serves to distinguish String
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* instrumentation objects from instrumentation objects of other types.
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*/
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public static final Units STRING = new Units("String", 5);
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/**
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* Units attribute representing Hertz (frequency).
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*/
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public static final Units HERTZ = new Units("Hertz", 6);
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/**
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* Returns a string describing this Unit of measurement attribute
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*
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* @return String - a descriptive string for this enum.
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*/
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public String toString() {
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return name;
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}
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/**
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* Returns the integer representation of this Units attribute
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*
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* @return int - an integer representation of this Units attribute.
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*/
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public int intValue() {
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return value;
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}
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/**
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* Maps an integer value to its corresponding Units attribute.
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* If the integer value does not have a corresponding Units enum
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* value, then {@link Units#INVALID} is returned.
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*
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* @param value an integer representation of counter Units
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* @return Units - the Units object for the given <code>value</code>
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* or {@link Units#INVALID} if out of range.
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*/
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public static Units toUnits(int value) {
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if (value < 0 || value >= map.length || map[value] == null) {
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return INVALID;
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}
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return map[value];
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}
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private Units(String name, int value) {
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this.name = name;
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this.value = value;
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map[value] = this;
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}
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private static final long serialVersionUID = 6992337162326171013L;
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}
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