1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304
/* * @(#)SimpleType.java 3.26 05/11/17 * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package javax.management.openmbean; // java import // import java.io.InvalidObjectException; import java.io.ObjectStreamException; import java.math.BigDecimal; import java.math.BigInteger; import java.util.Date; import java.util.Map; import java.util.HashMap; // jmx import // import javax.management.ObjectName; /** * The <code>SimpleType</code> class is the <i>open type</i> class whose instances describe * all <i>open data</i> values which are neither arrays, * nor {@link CompositeData <code>CompositeData</code>} values, * nor {@link TabularData <code>TabularData</code>} values. * It predefines all its possible instances as static fields, and has no public constructor. * <p> * Given a <code>SimpleType</code> instance describing values whose Java class name is <i>className</i>, * the internal fields corresponding to the name and description of this <code>SimpleType</code> instance * are also set to <i>className</i>. * In other words, its methods <code>getClassName</code>, <code>getTypeName</code> and <code>getDescription</code> * all return the same string value <i>className</i>. * * @version 3.26 05/11/17 * @author Sun Microsystems, Inc. * * @since 1.5 * @since.unbundled JMX 1.1 */ public final class SimpleType<T> extends OpenType<T> { /* Serial version */ static final long serialVersionUID = 2215577471957694503L; // SimpleType instances. // IF YOU ADD A SimpleType, YOU MUST UPDATE OpenType and typeArray /** * The <code>SimpleType</code> instance describing values whose * Java class name is <code>java.lang.Void</code>. */ public static final SimpleType<Void> VOID = new SimpleType<Void>(Void.class); /** * The <code>SimpleType</code> instance describing values whose * Java class name is <code>java.lang.Boolean</code>. */ public static final SimpleType<Boolean> BOOLEAN = new SimpleType<Boolean>(Boolean.class); /** * The <code>SimpleType</code> instance describing values whose * Java class name is <code>java.lang.Character</code>. */ public static final SimpleType<Character> CHARACTER = new SimpleType<Character>(Character.class); /** * The <code>SimpleType</code> instance describing values whose * Java class name is <code>java.lang.Byte</code>. */ public static final SimpleType<Byte> BYTE = new SimpleType<Byte>(Byte.class); /** * The <code>SimpleType</code> instance describing values whose * Java class name is <code>java.lang.Short</code>. */ public static final SimpleType<Short> SHORT = new SimpleType<Short>(Short.class); /** * The <code>SimpleType</code> instance describing values whose * Java class name is <code>java.lang.Integer</code>. */ public static final SimpleType<Integer> INTEGER = new SimpleType<Integer>(Integer.class); /** * The <code>SimpleType</code> instance describing values whose * Java class name is <code>java.lang.Long</code>. */ public static final SimpleType<Long> LONG = new SimpleType<Long>(Long.class); /** * The <code>SimpleType</code> instance describing values whose * Java class name is <code>java.lang.Float</code>. */ public static final SimpleType<Float> FLOAT = new SimpleType<Float>(Float.class); /** * The <code>SimpleType</code> instance describing values whose * Java class name is <code>java.lang.Double</code>. */ public static final SimpleType<Double> DOUBLE = new SimpleType<Double>(Double.class); /** * The <code>SimpleType</code> instance describing values whose * Java class name is <code>java.lang.String</code>. */ public static final SimpleType<String> STRING = new SimpleType<String>(String.class); /** * The <code>SimpleType</code> instance describing values whose * Java class name is <code>java.math.BigDecimal</code>. */ public static final SimpleType<BigDecimal> BIGDECIMAL = new SimpleType<BigDecimal>(BigDecimal.class); /** * The <code>SimpleType</code> instance describing values whose * Java class name is <code>java.math.BigInteger</code>. */ public static final SimpleType<BigInteger> BIGINTEGER = new SimpleType<BigInteger>(BigInteger.class); /** * The <code>SimpleType</code> instance describing values whose * Java class name is <code>java.util.Date</code>. */ public static final SimpleType<Date> DATE = new SimpleType<Date>(Date.class); /** * The <code>SimpleType</code> instance describing values whose * Java class name is <code>javax.management.ObjectName</code>. */ public static final SimpleType<ObjectName> OBJECTNAME = new SimpleType<ObjectName>(ObjectName.class); private static final SimpleType[] typeArray = { VOID, BOOLEAN, CHARACTER, BYTE, SHORT, INTEGER, LONG, FLOAT, DOUBLE, STRING, BIGDECIMAL, BIGINTEGER, DATE, OBJECTNAME, }; private transient Integer myHashCode = null; // As this instance is immutable, these two values private transient String myToString = null; // need only be calculated once. /* *** Constructor *** */ private SimpleType(Class<T> valueClass) { super(valueClass.getName(), valueClass.getName(), valueClass.getName(), false); } /* *** SimpleType specific information methods *** */ /** * Tests whether <var>obj</var> is a value for this * <code>SimpleType</code> instance. <p> This method returns * <code>true</code> if and only if <var>obj</var> is not null and * <var>obj</var>'s class name is the same as the className field * defined for this <code>SimpleType</code> instance (ie the class * name returned by the {@link OpenType#getClassName() * getClassName} method). * * @param obj the object to be tested. * * @return <code>true</code> if <var>obj</var> is a value for this * <code>SimpleType</code> instance. */ public boolean isValue(Object obj) { // if obj is null, return false // if (obj == null) { return false; } // Test if obj's class name is the same as for this instance // return this.getClassName().equals(obj.getClass().getName()); } /* *** Methods overriden from class Object *** */ /** * Compares the specified <code>obj</code> parameter with this <code>SimpleType</code> instance for equality. * <p> * Two <code>SimpleType</code> instances are equal if and only if their * {@link OpenType#getClassName() getClassName} methods return the same value. * * @param obj the object to be compared for equality with this <code>SimpleType</code> instance; * if <var>obj</var> is <code>null</code> or is not an instance of the class <code>SimpleType</code>, * <code>equals</code> returns <code>false</code>. * * @return <code>true</code> if the specified object is equal to this <code>SimpleType</code> instance. */ public boolean equals(Object obj) { /* If it weren't for readReplace(), we could replace this method with just: return (this == obj); */ if (!(obj instanceof SimpleType)) return false; SimpleType other = (SimpleType) obj; // Test if other's className field is the same as for this instance // return this.getClassName().equals(other.getClassName()); } /** * Returns the hash code value for this <code>SimpleType</code> instance. * The hash code of a <code>SimpleType</code> instance is the the hash code of * the string value returned by the {@link OpenType#getClassName() getClassName} method. * <p> * As <code>SimpleType</code> instances are immutable, the hash code for this instance is calculated once, * on the first call to <code>hashCode</code>, and then the same value is returned for subsequent calls. * * @return the hash code value for this <code>SimpleType</code> instance */ public int hashCode() { // Calculate the hash code value if it has not yet been done (ie 1st call to hashCode()) // if (myHashCode == null) { myHashCode = new Integer(this.getClassName().hashCode()); } // return always the same hash code for this instance (immutable) // return myHashCode.intValue(); } /** * Returns a string representation of this <code>SimpleType</code> instance. * <p> * The string representation consists of * the name of this class (ie <code>javax.management.openmbean.SimpleType</code>) and the type name * for this instance (which is the java class name of the values this <code>SimpleType</code> instance represents). * <p> * As <code>SimpleType</code> instances are immutable, the string representation for this instance is calculated once, * on the first call to <code>toString</code>, and then the same value is returned for subsequent calls. * * @return a string representation of this <code>SimpleType</code> instance */ public String toString() { // Calculate the string representation if it has not yet been done (ie 1st call to toString()) // if (myToString == null) { myToString = this.getClass().getName()+ "(name="+ getTypeName() +")"; } // return always the same string representation for this instance (immutable) // return myToString; } private static final Map<SimpleType,SimpleType> canonicalTypes = new HashMap<SimpleType,SimpleType>(); static { for (int i = 0; i < typeArray.length; i++) { final SimpleType type = typeArray[i]; canonicalTypes.put(type, type); } } /** * Replace an object read from an {@link * java.io.ObjectInputStream} with the unique instance for that * value. * * @return the replacement object. * * @exception ObjectStreamException if the read object cannot be * resolved. */ public Object readResolve() throws ObjectStreamException { final SimpleType canonical = (SimpleType) canonicalTypes.get(this); if (canonical == null) { // Should not happen throw new InvalidObjectException("Invalid SimpleType: " + this); } return canonical; } }