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| 1 | +/* | |
| 2 | + * Copyright (c) 1998, 2006, 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 | + | |
| 26 | +package com.sun.jdi; | |
| 27 | + | |
| 28 | +import java.util.List; | |
| 29 | +import java.util.Map; | |
| 30 | + | |
| 31 | +/** | |
| 32 | + * An object that currently exists in the target VM. An ObjectReference | |
| 33 | + * mirrors only the object itself and is not specific to any | |
| 34 | + * {@link Field} or {@link LocalVariable} to which it is currently | |
| 35 | + * assigned. An ObjectReference can | |
| 36 | + * have 0 or more references from field(s) and/or variable(s). | |
| 37 | + * <p> | |
| 38 | + * Any method on <code>ObjectReference</code> which directly or | |
| 39 | + * indirectly takes <code>ObjectReference</code> as an parameter may throw | |
| 40 | + * {@link com.sun.jdi.VMDisconnectedException} if the target VM is | |
| 41 | + * disconnected and the {@link com.sun.jdi.event.VMDisconnectEvent} has been or is | |
| 42 | + * available to be read from the {@link com.sun.jdi.event.EventQueue}. | |
| 43 | + * <p> | |
| 44 | + * Any method on <code>ObjectReference</code> which directly or | |
| 45 | + * indirectly takes <code>ObjectReference</code> as an parameter may throw | |
| 46 | + * {@link com.sun.jdi.VMOutOfMemoryException} if the target VM has run out of memory. | |
| 47 | + * <p> | |
| 48 | + * Any method on <code>ObjectReference</code> or which directly or indirectly takes | |
| 49 | + * <code>ObjectReference</code> as parameter may throw | |
| 50 | + * {@link com.sun.jdi.ObjectCollectedException} if the mirrored object has been | |
| 51 | + * garbage collected. | |
| 52 | + * | |
| 53 | + * @author Robert Field | |
| 54 | + * @author Gordon Hirsch | |
| 55 | + * @author James McIlree | |
| 56 | + * @since 1.3 | |
| 57 | + */ | |
| 58 | +public interface ObjectReference extends Value | |
| 59 | +{ | |
| 60 | + /** | |
| 61 | + * Gets the {@link ReferenceType} that mirrors the type | |
| 62 | + * of this object. The type may be a subclass or implementor of the | |
| 63 | + * declared type of any field or variable which currently holds it. | |
| 64 | + * For example, right after the following statement. | |
| 65 | + * <p> | |
| 66 | + * <code>Object obj = new String("Hello, world!");</code> | |
| 67 | + * <p> | |
| 68 | + * The ReferenceType of obj will mirror java.lang.String and not | |
| 69 | + * java.lang.Object. | |
| 70 | + * <p> | |
| 71 | + * The type of an object never changes, so this method will | |
| 72 | + * always return the same ReferenceType over the lifetime of the | |
| 73 | + * mirrored object. | |
| 74 | + * <p> | |
| 75 | + * The returned ReferenceType will be a {@link ClassType} or | |
| 76 | + * {@link ArrayType} and never an {@link InterfaceType}. | |
| 77 | + * | |
| 78 | + * @return the {@link ReferenceType} for this object. | |
| 79 | + */ | |
| 80 | + ReferenceType referenceType(); | |
| 81 | + | |
| 82 | + /** | |
| 83 | + * Gets the value of a given instance or static field in this object. | |
| 84 | + * The Field must be valid for this ObjectReference; | |
| 85 | + * that is, it must be from | |
| 86 | + * the mirrored object's class or a superclass of that class. | |
| 87 | + * | |
| 88 | + * @param sig the field containing the requested value | |
| 89 | + * @return the {@link Value} of the instance field. | |
| 90 | + * @throws java.lang.IllegalArgumentException if the field is not valid for | |
| 91 | + * this object's class. | |
| 92 | + */ | |
| 93 | + Value getValue(Field sig); | |
| 94 | + | |
| 95 | + /** | |
| 96 | + * Gets the value of multiple instance and/or static fields in this object. | |
| 97 | + * The Fields must be valid for this ObjectReference; | |
| 98 | + * that is, they must be from | |
| 99 | + * the mirrored object's class or a superclass of that class. | |
| 100 | + * | |
| 101 | + * @param fields a list of {@link Field} objects containing the | |
| 102 | + * requested values. | |
| 103 | + * @return a Map of the requested {@link Field} objects with | |
| 104 | + * their {@link Value}. | |
| 105 | + * @throws java.lang.IllegalArgumentException if any field is not valid for | |
| 106 | + * this object's class. | |
| 107 | + */ | |
| 108 | + Map<Field,Value> getValues(List<? extends Field> fields); | |
| 109 | + | |
| 110 | + /** | |
| 111 | + * Sets the value of a given instance or static field in this object. | |
| 112 | + * The {@link Field} must be valid for this ObjectReference; that is, | |
| 113 | + * it must be from the mirrored object's class or a superclass of that class. | |
| 114 | + * If static, the field must not be final. | |
| 115 | + * <p> | |
| 116 | + * Object values must be assignment compatible with the field type | |
| 117 | + * (This implies that the field type must be loaded through the | |
| 118 | + * enclosing class's class loader). Primitive values must be | |
| 119 | + * either assignment compatible with the field type or must be | |
| 120 | + * convertible to the field type without loss of information. | |
| 121 | + * See section 5.2 of | |
| 122 | + * <cite>The Java™ Language Specification</cite> | |
| 123 | + * for more information on assignment | |
| 124 | + * compatibility. | |
| 125 | + * | |
| 126 | + * @param field the field containing the requested value | |
| 127 | + * @param value the new value to assign | |
| 128 | + * @throws java.lang.IllegalArgumentException if the field is not valid for | |
| 129 | + * this object's class. | |
| 130 | + * @throws InvalidTypeException if the value's type does not match | |
| 131 | + * the field's type. | |
| 132 | + * @throws ClassNotLoadedException if 'value' is not null, and the field | |
| 133 | + * type has not yet been loaded through the appropriate class loader. | |
| 134 | + * @throws VMCannotBeModifiedException if the VirtualMachine is read-only - see {@link VirtualMachine#canBeModified()}. | |
| 135 | + */ | |
| 136 | + void setValue(Field field, Value value) | |
| 137 | + throws InvalidTypeException, ClassNotLoadedException; | |
| 138 | + | |
| 139 | + /** Perform method invocation with only the invoking thread resumed */ | |
| 140 | + static final int INVOKE_SINGLE_THREADED = 0x1; | |
| 141 | + /** Perform non-virtual method invocation */ | |
| 142 | + static final int INVOKE_NONVIRTUAL = 0x2; | |
| 143 | + | |
| 144 | + /** | |
| 145 | + * Invokes the specified {@link Method} on this object in the | |
| 146 | + * target VM. The | |
| 147 | + * specified method can be defined in this object's class, | |
| 148 | + * in a superclass of this object's class, or in an interface | |
| 149 | + * implemented by this object. The method may be a static method | |
| 150 | + * or an instance method, but not a static initializer or constructor. | |
| 151 | + * Use {@link ClassType#newInstance} to create a new object and | |
| 152 | + * run its constructor. | |
| 153 | + * <p> | |
| 154 | + * The method invocation will occur in the specified thread. | |
| 155 | + * Method invocation can occur only if the specified thread | |
| 156 | + * has been suspended by an event which occurred in that thread. | |
| 157 | + * Method invocation is not supported | |
| 158 | + * when the target VM has been suspended through | |
| 159 | + * {@link VirtualMachine#suspend} or when the specified thread | |
| 160 | + * is suspended through {@link ThreadReference#suspend}. | |
| 161 | + * <p> | |
| 162 | + * The specified method is invoked with the arguments in the specified | |
| 163 | + * argument list. The method invocation is synchronous; this method | |
| 164 | + * does not return until the invoked method returns in the target VM. | |
| 165 | + * If the invoked method throws an exception, this method | |
| 166 | + * will throw an {@link InvocationException} which contains | |
| 167 | + * a mirror to the exception object thrown. | |
| 168 | + * <p> | |
| 169 | + * Object arguments must be assignment compatible with the argument type | |
| 170 | + * (This implies that the argument type must be loaded through the | |
| 171 | + * enclosing class's class loader). Primitive arguments must be | |
| 172 | + * either assignment compatible with the argument type or must be | |
| 173 | + * convertible to the argument type without loss of information. | |
| 174 | + * If the method being called accepts a variable number of arguments, | |
| 175 | + * then the last argument type is an array of some component type. | |
| 176 | + * The argument in the matching position can be omitted, or can be null, | |
| 177 | + * an array of the same component type, or an argument of the | |
| 178 | + * component type followed by any number of other arguments of the same | |
| 179 | + * type. If the argument is omitted, then a 0 length array of the | |
| 180 | + * component type is passed. The component type can be a primitive type. | |
| 181 | + * Autoboxing is not supported. | |
| 182 | + * | |
| 183 | + * See section 5.2 of | |
| 184 | + * <cite>The Java™ Language Specification</cite> | |
| 185 | + * for more information on assignment compatibility. | |
| 186 | + * <p> | |
| 187 | + * By default, the method is invoked using dynamic lookup as | |
| 188 | + * documented in section 15.12.4.4 of | |
| 189 | + * <cite>The Java™ Language Specification</cite> | |
| 190 | + * in particular, overriding based on the runtime type of the object | |
| 191 | + * mirrored by this {@link ObjectReference} will occur. This | |
| 192 | + * behavior can be changed by specifying the | |
| 193 | + * {@link #INVOKE_NONVIRTUAL} bit flag in the <code>options</code> | |
| 194 | + * argument. If this flag is set, the specified method is invoked | |
| 195 | + * whether or not it is overridden for this object's runtime type. | |
| 196 | + * The method, in this case, must not belong to an interface and | |
| 197 | + * must not be abstract. This option is useful for performing method | |
| 198 | + * invocations like those done with the <code>super</code> keyword in | |
| 199 | + * the Java programming language. | |
| 200 | + * <p> | |
| 201 | + * By default, all threads in the target VM are resumed while | |
| 202 | + * the method is being invoked if they were previously | |
| 203 | + * suspended by an event or by {@link VirtualMachine#suspend} or | |
| 204 | + * {@link ThreadReference#suspend}. This is done to prevent the deadlocks | |
| 205 | + * that will occur if any of the threads own monitors | |
| 206 | + * that will be needed by the invoked method. | |
| 207 | + * Note, however, that this implicit resume acts exactly like | |
| 208 | + * {@link ThreadReference#resume}, so if the thread's suspend | |
| 209 | + * count is greater than 1, it will remain in a suspended state | |
| 210 | + * during the invocation and thus a deadlock could still occur. | |
| 211 | + * By default, when the invocation completes, | |
| 212 | + * all threads in the target VM are suspended, regardless their state | |
| 213 | + * before the invocation. | |
| 214 | + * It is possible that | |
| 215 | + * breakpoints or other events might occur during the invocation. | |
| 216 | + * This can cause deadlocks as described above. It can also cause a deadlock | |
| 217 | + * if invokeMethod is called from the client's event handler thread. In this | |
| 218 | + * case, this thread will be waiting for the invokeMethod to complete and | |
| 219 | + * won't read the EventSet that comes in for the new event. If this | |
| 220 | + * new EventSet is SUSPEND_ALL, then a deadlock will occur because no | |
| 221 | + * one will resume the EventSet. To avoid this, all EventRequests should | |
| 222 | + * be disabled before doing the invokeMethod, or the invokeMethod should | |
| 223 | + * not be done from the client's event handler thread. | |
| 224 | + * <p> | |
| 225 | + * The resumption of other threads during the invocation can be prevented | |
| 226 | + * by specifying the {@link #INVOKE_SINGLE_THREADED} | |
| 227 | + * bit flag in the <code>options</code> argument; however, | |
| 228 | + * there is no protection against or recovery from the deadlocks | |
| 229 | + * described above, so this option should be used with great caution. | |
| 230 | + * Only the specified thread will be resumed (as described for all | |
| 231 | + * threads above). Upon completion of a single threaded invoke, the invoking thread | |
| 232 | + * will be suspended once again. Note that any threads started during | |
| 233 | + * the single threaded invocation will not be suspended when the | |
| 234 | + * invocation completes. | |
| 235 | + * <p> | |
| 236 | + * If the target VM is disconnected during the invoke (for example, through | |
| 237 | + * {@link VirtualMachine#dispose}) the method invocation continues. | |
| 238 | + * | |
| 239 | + * @param thread the thread in which to invoke. | |
| 240 | + * @param method the {@link Method} to invoke. | |
| 241 | + * @param arguments the list of {@link Value} arguments bound to the | |
| 242 | + * invoked method. Values from the list are assigned to arguments | |
| 243 | + * in the order they appear in the method signature. | |
| 244 | + * @param options the integer bit flag options. | |
| 245 | + * @return a {@link Value} mirror of the invoked method's return value. | |
| 246 | + * @throws java.lang.IllegalArgumentException if the method is not | |
| 247 | + * a member of this object's class, if the size of the argument list | |
| 248 | + * does not match the number of declared arguemnts for the method, | |
| 249 | + * if the method is a constructor or static intializer, or | |
| 250 | + * if {@link #INVOKE_NONVIRTUAL} is specified and the method is | |
| 251 | + * either abstract or an interface member. | |
| 252 | + * @throws {@link InvalidTypeException} if any argument in the | |
| 253 | + * argument list is not assignable to the corresponding method argument | |
| 254 | + * type. | |
| 255 | + * @throws ClassNotLoadedException if any argument type has not yet been loaded | |
| 256 | + * through the appropriate class loader. | |
| 257 | + * @throws IncompatibleThreadStateException if the specified thread has not | |
| 258 | + * been suspended by an event. | |
| 259 | + * @throws InvocationException if the method invocation resulted in | |
| 260 | + * an exception in the target VM. | |
| 261 | + * @throws InvalidTypeException If the arguments do not meet this requirement -- | |
| 262 | + * Object arguments must be assignment compatible with the argument | |
| 263 | + * type. This implies that the argument type must be | |
| 264 | + * loaded through the enclosing class's class loader. | |
| 265 | + * Primitive arguments must be either assignment compatible with the | |
| 266 | + * argument type or must be convertible to the argument type without loss | |
| 267 | + * of information. See JLS section 5.2 for more information on assignment | |
| 268 | + * compatibility. | |
| 269 | + * @throws VMCannotBeModifiedException if the VirtualMachine is read-only - see {@link VirtualMachine#canBeModified()}. | |
| 270 | + */ | |
| 271 | + Value invokeMethod(ThreadReference thread, Method method, | |
| 272 | + List<? extends Value> arguments, int options) | |
| 273 | + throws InvalidTypeException, | |
| 274 | + ClassNotLoadedException, | |
| 275 | + IncompatibleThreadStateException, | |
| 276 | + InvocationException; | |
| 277 | + | |
| 278 | + /** | |
| 279 | + * Prevents garbage collection for this object. By default all | |
| 280 | + * {@link ObjectReference} values returned by JDI may be collected | |
| 281 | + * at any time the target VM is running. A call to this method | |
| 282 | + * guarantees that the object will not be collected. | |
| 283 | + * {@link #enableCollection} can be used to allow collection once | |
| 284 | + * again. | |
| 285 | + * <p> | |
| 286 | + * Calls to this method are counted. Every call to this method | |
| 287 | + * requires a corresponding call to {@link #enableCollection} before | |
| 288 | + * garbage collection is re-enabled. | |
| 289 | + * <p> | |
| 290 | + * Note that while the target VM is suspended, no garbage collection | |
| 291 | + * will occur because all threads are suspended. The typical | |
| 292 | + * examination of variables, fields, and arrays during the suspension | |
| 293 | + * is safe without explicitly disabling garbage collection. | |
| 294 | + * <p> | |
| 295 | + * This method should be used sparingly, as it alters the | |
| 296 | + * pattern of garbage collection in the target VM and, | |
| 297 | + * consequently, may result in application behavior under the | |
| 298 | + * debugger that differs from its non-debugged behavior. | |
| 299 | + * @throws VMCannotBeModifiedException if the VirtualMachine is read-only | |
| 300 | + * -see {@link VirtualMachine#canBeModified()}. | |
| 301 | + */ | |
| 302 | + void disableCollection(); | |
| 303 | + | |
| 304 | + /** | |
| 305 | + * Permits garbage collection for this object. By default all | |
| 306 | + * {@link ObjectReference} values returned by JDI may be collected | |
| 307 | + * at any time the target VM is running. A call to this method | |
| 308 | + * is necessary only if garbage collection was previously disabled | |
| 309 | + * with {@link #disableCollection}. | |
| 310 | + * @throws VMCannotBeModifiedException if the VirtualMachine is read-only | |
| 311 | + * -see {@link VirtualMachine#canBeModified()}. | |
| 312 | + */ | |
| 313 | + void enableCollection(); | |
| 314 | + | |
| 315 | + /** | |
| 316 | + * Determines if this object has been garbage collected in the target | |
| 317 | + * VM. | |
| 318 | + * | |
| 319 | + * @return <code>true</code> if this {@link ObjectReference} has been collected; | |
| 320 | + * <code>false</code> otherwise. | |
| 321 | + * @throws VMCannotBeModifiedException if the VirtualMachine is read-only | |
| 322 | + * -see {@link VirtualMachine#canBeModified()}. | |
| 323 | + */ | |
| 324 | + boolean isCollected(); | |
| 325 | + | |
| 326 | + /** | |
| 327 | + * Returns a unique identifier for this ObjectReference. | |
| 328 | + * It is guaranteed to be unique among all | |
| 329 | + * ObjectReferences from the same VM that have not yet been disposed. | |
| 330 | + * The guarantee applies as long | |
| 331 | + * as this ObjectReference has not yet been disposed. | |
| 332 | + * | |
| 333 | + * @return a long unique ID | |
| 334 | + */ | |
| 335 | + long uniqueID(); | |
| 336 | + | |
| 337 | + /** | |
| 338 | + * Returns a List containing a {@link ThreadReference} for | |
| 339 | + * each thread currently waiting for this object's monitor. | |
| 340 | + * See {@link ThreadReference#currentContendedMonitor} for | |
| 341 | + * information about when a thread is considered to be waiting | |
| 342 | + * for a monitor. | |
| 343 | + * <p> | |
| 344 | + * Not all target VMs support this operation. See | |
| 345 | + * VirtualMachine#canGetMonitorInfo to determine if the | |
| 346 | + * operation is supported. | |
| 347 | + * | |
| 348 | + * @return a List of {@link ThreadReference} objects. The list | |
| 349 | + * has zero length if no threads are waiting for the monitor. | |
| 350 | + * @throws java.lang.UnsupportedOperationException if the | |
| 351 | + * target VM does not support this operation. | |
| 352 | + * @throws IncompatibleThreadStateException if any | |
| 353 | + * waiting thread is not suspended | |
| 354 | + * in the target VM | |
| 355 | + */ | |
| 356 | + List<ThreadReference> waitingThreads() | |
| 357 | + throws IncompatibleThreadStateException; | |
| 358 | + | |
| 359 | + /** | |
| 360 | + * Returns an {@link ThreadReference} for the thread, if any, | |
| 361 | + * which currently owns this object's monitor. | |
| 362 | + * See {@link ThreadReference#ownedMonitors} for a definition | |
| 363 | + * of ownership. | |
| 364 | + * <p> | |
| 365 | + * Not all target VMs support this operation. See | |
| 366 | + * VirtualMachine#canGetMonitorInfo to determine if the | |
| 367 | + * operation is supported. | |
| 368 | + * | |
| 369 | + * @return the {@link ThreadReference} which currently owns the | |
| 370 | + * monitor, or null if it is unowned. | |
| 371 | + * | |
| 372 | + * @throws java.lang.UnsupportedOperationException if the | |
| 373 | + * target VM does not support this operation. | |
| 374 | + * @throws IncompatibleThreadStateException if the owning thread is | |
| 375 | + * not suspended in the target VM | |
| 376 | + */ | |
| 377 | + ThreadReference owningThread() throws IncompatibleThreadStateException; | |
| 378 | + | |
| 379 | + /** | |
| 380 | + * Returns the number times this object's monitor has been | |
| 381 | + * entered by the current owning thread. | |
| 382 | + * See {@link ThreadReference#ownedMonitors} for a definition | |
| 383 | + * of ownership. | |
| 384 | + * <p> | |
| 385 | + * Not all target VMs support this operation. See | |
| 386 | + * VirtualMachine#canGetMonitorInfo to determine if the | |
| 387 | + * operation is supported. | |
| 388 | + * | |
| 389 | + * @see #owningThread | |
| 390 | + * @return the integer count of the number of entries. | |
| 391 | + * | |
| 392 | + * @throws java.lang.UnsupportedOperationException if the | |
| 393 | + * target VM does not support this operation. | |
| 394 | + * @throws IncompatibleThreadStateException if the owning thread is | |
| 395 | + * not suspended in the target VM | |
| 396 | + */ | |
| 397 | + int entryCount() throws IncompatibleThreadStateException; | |
| 398 | + | |
| 399 | + /** | |
| 400 | + * Returns objects that directly reference this object. | |
| 401 | + * Only objects that are reachable for the purposes of garbage collection | |
| 402 | + * are returned. Note that an object can also be referenced in other ways, | |
| 403 | + * such as from a local variable in a stack frame, or from a JNI global | |
| 404 | + * reference. Such non-object referrers are not returned by this method. | |
| 405 | + * <p> | |
| 406 | + * Not all target virtual machines support this operation. | |
| 407 | + * Use {@link VirtualMachine#canGetInstanceInfo()} | |
| 408 | + * to determine if the operation is supported. | |
| 409 | + * | |
| 410 | + * @see VirtualMachine#instanceCounts(List) | |
| 411 | + * @see ReferenceType#instances(long) | |
| 412 | + | |
| 413 | + * @param maxReferrers The maximum number of referring objects to return. | |
| 414 | + * Must be non-negative. If zero, all referring | |
| 415 | + * objects are returned. | |
| 416 | + * @return a of List of {@link ObjectReference} objects. If there are | |
| 417 | + * no objects that reference this object, a zero-length list is returned.. | |
| 418 | + * @throws java.lang.UnsupportedOperationException if | |
| 419 | + * the target virtual machine does not support this | |
| 420 | + * operation - see | |
| 421 | + * {@link VirtualMachine#canGetInstanceInfo() canGetInstanceInfo()} | |
| 422 | + * @throws java.lang.IllegalArgumentException if maxReferrers is less | |
| 423 | + * than zero. | |
| 424 | + * @since 1.6 | |
| 425 | + */ | |
| 426 | + List<ObjectReference> referringObjects(long maxReferrers); | |
| 427 | + | |
| 428 | + | |
| 429 | + /** | |
| 430 | + * Compares the specified Object with this ObjectReference for equality. | |
| 431 | + * | |
| 432 | + * @return true if the Object is an ObjectReference, if the | |
| 433 | + * ObjectReferences belong to the same VM, and if applying the | |
| 434 | + * "==" operator on the mirrored objects in that VM evaluates to true. | |
| 435 | + */ | |
| 436 | + boolean equals(Object obj); | |
| 437 | + | |
| 438 | + /** | |
| 439 | + * Returns the hash code value for this ObjectReference. | |
| 440 | + * | |
| 441 | + * @return the integer hash code | |
| 442 | + */ | |
| 443 | + int hashCode(); | |
| 444 | +} | |