author | xdono |
Wed, 02 Jul 2008 12:55:45 -0700 | |
changeset 715 | f16baef3a20e |
parent 526 | 61ba2d5ea9da |
child 1510 | e747d3193ef2 |
permissions | -rw-r--r-- |
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/* |
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* Copyright 2000-2008 Sun Microsystems, Inc. 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. Sun designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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*/ |
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package javax.management.openmbean; |
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// java import |
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// |
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import java.io.InvalidObjectException; |
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import java.io.ObjectStreamException; |
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import java.math.BigDecimal; |
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import java.math.BigInteger; |
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import java.util.Date; |
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import java.util.Map; |
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import java.util.HashMap; |
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// jmx import |
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// |
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import javax.management.ObjectName; |
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/** |
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* The <code>SimpleType</code> class is the <i>open type</i> class whose instances describe |
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* all <i>open data</i> values which are neither arrays, |
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* nor {@link CompositeData <code>CompositeData</code>} values, |
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* nor {@link TabularData <code>TabularData</code>} values. |
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* It predefines all its possible instances as static fields, and has no public constructor. |
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* <p> |
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* Given a <code>SimpleType</code> instance describing values whose Java class name is <i>className</i>, |
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* the internal fields corresponding to the name and description of this <code>SimpleType</code> instance |
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* are also set to <i>className</i>. |
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* In other words, its methods <code>getClassName</code>, <code>getTypeName</code> and <code>getDescription</code> |
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* all return the same string value <i>className</i>. |
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* |
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* @since 1.5 |
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*/ |
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public final class SimpleType<T> extends OpenType<T> { |
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/* Serial version */ |
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static final long serialVersionUID = 2215577471957694503L; |
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// SimpleType instances. |
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// IF YOU ADD A SimpleType, YOU MUST UPDATE OpenType and typeArray |
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/** |
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* The <code>SimpleType</code> instance describing values whose |
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* Java class name is <code>java.lang.Void</code>. |
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*/ |
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public static final SimpleType<Void> VOID = |
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new SimpleType<Void>(Void.class); |
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/** |
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* The <code>SimpleType</code> instance describing values whose |
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* Java class name is <code>java.lang.Boolean</code>. |
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*/ |
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public static final SimpleType<Boolean> BOOLEAN = |
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new SimpleType<Boolean>(Boolean.class); |
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/** |
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* The <code>SimpleType</code> instance describing values whose |
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* Java class name is <code>java.lang.Character</code>. |
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*/ |
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public static final SimpleType<Character> CHARACTER = |
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new SimpleType<Character>(Character.class); |
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/** |
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* The <code>SimpleType</code> instance describing values whose |
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* Java class name is <code>java.lang.Byte</code>. |
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*/ |
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public static final SimpleType<Byte> BYTE = |
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new SimpleType<Byte>(Byte.class); |
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/** |
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* The <code>SimpleType</code> instance describing values whose |
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* Java class name is <code>java.lang.Short</code>. |
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*/ |
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public static final SimpleType<Short> SHORT = |
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new SimpleType<Short>(Short.class); |
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/** |
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* The <code>SimpleType</code> instance describing values whose |
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* Java class name is <code>java.lang.Integer</code>. |
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*/ |
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public static final SimpleType<Integer> INTEGER = |
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new SimpleType<Integer>(Integer.class); |
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/** |
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* The <code>SimpleType</code> instance describing values whose |
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* Java class name is <code>java.lang.Long</code>. |
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*/ |
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public static final SimpleType<Long> LONG = |
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new SimpleType<Long>(Long.class); |
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/** |
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* The <code>SimpleType</code> instance describing values whose |
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* Java class name is <code>java.lang.Float</code>. |
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*/ |
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public static final SimpleType<Float> FLOAT = |
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new SimpleType<Float>(Float.class); |
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/** |
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* The <code>SimpleType</code> instance describing values whose |
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* Java class name is <code>java.lang.Double</code>. |
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*/ |
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public static final SimpleType<Double> DOUBLE = |
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new SimpleType<Double>(Double.class); |
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/** |
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* The <code>SimpleType</code> instance describing values whose |
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* Java class name is <code>java.lang.String</code>. |
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*/ |
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public static final SimpleType<String> STRING = |
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new SimpleType<String>(String.class); |
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/** |
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* The <code>SimpleType</code> instance describing values whose |
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* Java class name is <code>java.math.BigDecimal</code>. |
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*/ |
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public static final SimpleType<BigDecimal> BIGDECIMAL = |
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new SimpleType<BigDecimal>(BigDecimal.class); |
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/** |
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* The <code>SimpleType</code> instance describing values whose |
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* Java class name is <code>java.math.BigInteger</code>. |
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*/ |
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public static final SimpleType<BigInteger> BIGINTEGER = |
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new SimpleType<BigInteger>(BigInteger.class); |
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/** |
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* The <code>SimpleType</code> instance describing values whose |
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* Java class name is <code>java.util.Date</code>. |
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*/ |
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public static final SimpleType<Date> DATE = |
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new SimpleType<Date>(Date.class); |
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/** |
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* The <code>SimpleType</code> instance describing values whose |
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* Java class name is <code>javax.management.ObjectName</code>. |
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*/ |
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public static final SimpleType<ObjectName> OBJECTNAME = |
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new SimpleType<ObjectName>(ObjectName.class); |
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private static final SimpleType[] typeArray = { |
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VOID, BOOLEAN, CHARACTER, BYTE, SHORT, INTEGER, LONG, FLOAT, |
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DOUBLE, STRING, BIGDECIMAL, BIGINTEGER, DATE, OBJECTNAME, |
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}; |
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private transient Integer myHashCode = null; // As this instance is immutable, these two values |
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private transient String myToString = null; // need only be calculated once. |
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/* *** Constructor *** */ |
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private SimpleType(Class<T> valueClass) { |
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super(valueClass.getName(), valueClass.getName(), valueClass.getName(), |
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false); |
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} |
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/* *** SimpleType specific information methods *** */ |
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/** |
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* Tests whether <var>obj</var> is a value for this |
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* <code>SimpleType</code> instance. <p> This method returns |
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* <code>true</code> if and only if <var>obj</var> is not null and |
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* <var>obj</var>'s class name is the same as the className field |
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* defined for this <code>SimpleType</code> instance (ie the class |
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* name returned by the {@link OpenType#getClassName() |
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* getClassName} method). |
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* |
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* @param obj the object to be tested. |
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* |
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* @return <code>true</code> if <var>obj</var> is a value for this |
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* <code>SimpleType</code> instance. |
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*/ |
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public boolean isValue(Object obj) { |
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// if obj is null, return false |
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// |
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if (obj == null) { |
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return false; |
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} |
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// Test if obj's class name is the same as for this instance |
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// |
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return this.getClassName().equals(obj.getClass().getName()); |
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} |
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/* *** Methods overriden from class Object *** */ |
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/** |
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* Compares the specified <code>obj</code> parameter with this <code>SimpleType</code> instance for equality. |
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* <p> |
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* Two <code>SimpleType</code> instances are equal if and only if their |
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* {@link OpenType#getClassName() getClassName} methods return the same value. |
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* |
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* @param obj the object to be compared for equality with this <code>SimpleType</code> instance; |
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* if <var>obj</var> is <code>null</code> or is not an instance of the class <code>SimpleType</code>, |
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* <code>equals</code> returns <code>false</code>. |
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* |
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* @return <code>true</code> if the specified object is equal to this <code>SimpleType</code> instance. |
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*/ |
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public boolean equals(Object obj) { |
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/* If it weren't for readReplace(), we could replace this method |
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with just: |
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return (this == obj); |
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*/ |
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if (!(obj instanceof SimpleType)) |
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return false; |
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SimpleType other = (SimpleType) obj; |
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// Test if other's className field is the same as for this instance |
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// |
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return this.getClassName().equals(other.getClassName()); |
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} |
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/** |
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* Returns the hash code value for this <code>SimpleType</code> instance. |
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* The hash code of a <code>SimpleType</code> instance is the the hash code of |
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* the string value returned by the {@link OpenType#getClassName() getClassName} method. |
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* <p> |
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* As <code>SimpleType</code> instances are immutable, the hash code for this instance is calculated once, |
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* on the first call to <code>hashCode</code>, and then the same value is returned for subsequent calls. |
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* |
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* @return the hash code value for this <code>SimpleType</code> instance |
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*/ |
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public int hashCode() { |
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// Calculate the hash code value if it has not yet been done (ie 1st call to hashCode()) |
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// |
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if (myHashCode == null) { |
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526
61ba2d5ea9da
6701459: Synchronization bug pattern found in javax.management.relation.RelationService
emcmanus
parents:
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diff
changeset
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myHashCode = Integer.valueOf(this.getClassName().hashCode()); |
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} |
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// return always the same hash code for this instance (immutable) |
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// |
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return myHashCode.intValue(); |
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} |
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/** |
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* Returns a string representation of this <code>SimpleType</code> instance. |
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* <p> |
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* The string representation consists of |
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* the name of this class (ie <code>javax.management.openmbean.SimpleType</code>) and the type name |
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* for this instance (which is the java class name of the values this <code>SimpleType</code> instance represents). |
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* <p> |
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* As <code>SimpleType</code> instances are immutable, the string representation for this instance is calculated once, |
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* on the first call to <code>toString</code>, and then the same value is returned for subsequent calls. |
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* |
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* @return a string representation of this <code>SimpleType</code> instance |
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*/ |
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public String toString() { |
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// Calculate the string representation if it has not yet been done (ie 1st call to toString()) |
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// |
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if (myToString == null) { |
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myToString = this.getClass().getName()+ "(name="+ getTypeName() +")"; |
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} |
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// return always the same string representation for this instance (immutable) |
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// |
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return myToString; |
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} |
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private static final Map<SimpleType,SimpleType> canonicalTypes = |
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new HashMap<SimpleType,SimpleType>(); |
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static { |
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for (int i = 0; i < typeArray.length; i++) { |
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final SimpleType type = typeArray[i]; |
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canonicalTypes.put(type, type); |
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} |
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} |
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/** |
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* Replace an object read from an {@link |
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* java.io.ObjectInputStream} with the unique instance for that |
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* value. |
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* |
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* @return the replacement object. |
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* |
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* @exception ObjectStreamException if the read object cannot be |
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* resolved. |
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*/ |
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public Object readResolve() throws ObjectStreamException { |
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final SimpleType canonical = canonicalTypes.get(this); |
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if (canonical == null) { |
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// Should not happen |
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throw new InvalidObjectException("Invalid SimpleType: " + this); |
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} |
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return canonical; |
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} |
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} |