J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.rmi.rmic.newrmic.jrmp; |
| 27 | |
| 28 | import com.sun.javadoc.ClassDoc; |
| 29 | import com.sun.javadoc.MethodDoc; |
| 30 | import com.sun.javadoc.Parameter; |
| 31 | import com.sun.javadoc.Type; |
| 32 | import java.io.IOException; |
| 33 | import java.io.ByteArrayOutputStream; |
| 34 | import java.io.DataOutputStream; |
| 35 | import java.security.MessageDigest; |
| 36 | import java.security.DigestOutputStream; |
| 37 | import java.security.NoSuchAlgorithmException; |
| 38 | import java.util.ArrayList; |
| 39 | import java.util.Arrays; |
| 40 | import java.util.Comparator; |
| 41 | import java.util.List; |
| 42 | import java.util.HashMap; |
| 43 | import java.util.Map; |
| 44 | import sun.rmi.rmic.newrmic.BatchEnvironment; |
| 45 | |
| 46 | import static sun.rmi.rmic.newrmic.Constants.*; |
| 47 | import static sun.rmi.rmic.newrmic.jrmp.Constants.*; |
| 48 | |
| 49 | /** |
| 50 | * Encapsulates RMI-specific information about a remote implementation |
| 51 | * class (a class that implements one or more remote interfaces). |
| 52 | * |
| 53 | * WARNING: The contents of this source file are not part of any |
| 54 | * supported API. Code that depends on them does so at its own risk: |
| 55 | * they are subject to change or removal without notice. |
| 56 | * |
| 57 | * @author Peter Jones |
| 58 | **/ |
| 59 | final class RemoteClass { |
| 60 | |
| 61 | /** rmic environment for this object */ |
| 62 | private final BatchEnvironment env; |
| 63 | |
| 64 | /** the remote implementation class this object represents */ |
| 65 | private final ClassDoc implClass; |
| 66 | |
| 67 | /** remote interfaces implemented by this class */ |
| 68 | private ClassDoc[] remoteInterfaces; |
| 69 | |
| 70 | /** the remote methods of this class */ |
| 71 | private Method[] remoteMethods; |
| 72 | |
| 73 | /** stub/skeleton "interface hash" for this class */ |
| 74 | private long interfaceHash; |
| 75 | |
| 76 | /** |
| 77 | * Creates a RemoteClass instance that represents the RMI-specific |
| 78 | * information about the specified remote implementation class. |
| 79 | * |
| 80 | * If the class is not a valid remote implementation class or if |
| 81 | * some other error occurs, the return value will be null, and |
| 82 | * errors will have been reported to the supplied |
| 83 | * BatchEnvironment. |
| 84 | **/ |
| 85 | static RemoteClass forClass(BatchEnvironment env, ClassDoc implClass) { |
| 86 | RemoteClass remoteClass = new RemoteClass(env, implClass); |
| 87 | if (remoteClass.init()) { |
| 88 | return remoteClass; |
| 89 | } else { |
| 90 | return null; |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * Creates a RemoteClass instance for the specified class. The |
| 96 | * resulting object is not yet initialized. |
| 97 | **/ |
| 98 | private RemoteClass(BatchEnvironment env, ClassDoc implClass) { |
| 99 | this.env = env; |
| 100 | this.implClass = implClass; |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * Returns the ClassDoc for this remote implementation class. |
| 105 | **/ |
| 106 | ClassDoc classDoc() { |
| 107 | return implClass; |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * Returns the remote interfaces implemented by this remote |
| 112 | * implementation class. |
| 113 | * |
| 114 | * A remote interface is an interface that is a subinterface of |
| 115 | * java.rmi.Remote. The remote interfaces of a class are the |
| 116 | * direct superinterfaces of the class and all of its superclasses |
| 117 | * that are remote interfaces. |
| 118 | * |
| 119 | * The order of the array returned is arbitrary, and some elements |
| 120 | * may be superfluous (i.e., superinterfaces of other interfaces |
| 121 | * in the array). |
| 122 | **/ |
| 123 | ClassDoc[] remoteInterfaces() { |
| 124 | return (ClassDoc[]) remoteInterfaces.clone(); |
| 125 | } |
| 126 | |
| 127 | /** |
| 128 | * Returns an array of RemoteClass.Method objects representing all |
| 129 | * of the remote methods of this remote implementation class (all |
| 130 | * of the member methods of the class's remote interfaces). |
| 131 | * |
| 132 | * The methods in the array are ordered according to a comparison |
| 133 | * of strings consisting of their name followed by their |
| 134 | * descriptor, so each method's index in the array corresponds to |
| 135 | * its "operation number" in the JDK 1.1 version of the JRMP |
| 136 | * stub/skeleton protocol. |
| 137 | **/ |
| 138 | Method[] remoteMethods() { |
| 139 | return (Method[]) remoteMethods.clone(); |
| 140 | } |
| 141 | |
| 142 | /** |
| 143 | * Returns the "interface hash" used to match a stub/skeleton pair |
| 144 | * for this remote implementation class in the JDK 1.1 version of |
| 145 | * the JRMP stub/skeleton protocol. |
| 146 | **/ |
| 147 | long interfaceHash() { |
| 148 | return interfaceHash; |
| 149 | } |
| 150 | |
| 151 | /** |
| 152 | * Validates this remote implementation class and computes the |
| 153 | * RMI-specific information. Returns true if successful, or false |
| 154 | * if an error occurred. |
| 155 | **/ |
| 156 | private boolean init() { |
| 157 | /* |
| 158 | * Verify that it is really a class, not an interface. |
| 159 | */ |
| 160 | if (implClass.isInterface()) { |
| 161 | env.error("rmic.cant.make.stubs.for.interface", |
| 162 | implClass.qualifiedName()); |
| 163 | return false; |
| 164 | } |
| 165 | |
| 166 | /* |
| 167 | * Find all of the remote interfaces of our remote |
| 168 | * implementation class-- for each class up the superclass |
| 169 | * chain, add each directly-implemented interface that somehow |
| 170 | * extends Remote to a list. |
| 171 | */ |
| 172 | List<ClassDoc> remotesImplemented = new ArrayList<ClassDoc>(); |
| 173 | for (ClassDoc cl = implClass; cl != null; cl = cl.superclass()) { |
| 174 | for (ClassDoc intf : cl.interfaces()) { |
| 175 | /* |
| 176 | * Add interface to the list if it extends Remote and |
| 177 | * it is not already there. |
| 178 | */ |
| 179 | if (!remotesImplemented.contains(intf) && |
| 180 | intf.subclassOf(env.docRemote())) |
| 181 | { |
| 182 | remotesImplemented.add(intf); |
| 183 | if (env.verbose()) { |
| 184 | env.output("[found remote interface: " + |
| 185 | intf.qualifiedName() + "]"); |
| 186 | } |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | /* |
| 191 | * Verify that the candidate remote implementation class |
| 192 | * implements at least one remote interface directly. |
| 193 | */ |
| 194 | if (cl == implClass && remotesImplemented.isEmpty()) { |
| 195 | if (implClass.subclassOf(env.docRemote())) { |
| 196 | /* |
| 197 | * This error message is used if the class does |
| 198 | * implement a remote interface through one of its |
| 199 | * superclasses, but not directly. |
| 200 | */ |
| 201 | env.error("rmic.must.implement.remote.directly", |
| 202 | implClass.qualifiedName()); |
| 203 | } else { |
| 204 | /* |
| 205 | * This error message is used if the class does |
| 206 | * not implement a remote interface at all. |
| 207 | */ |
| 208 | env.error("rmic.must.implement.remote", |
| 209 | implClass.qualifiedName()); |
| 210 | } |
| 211 | return false; |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | /* |
| 216 | * Convert list of remote interfaces to an array |
| 217 | * (order is not important for this array). |
| 218 | */ |
| 219 | remoteInterfaces = |
| 220 | remotesImplemented.toArray( |
| 221 | new ClassDoc[remotesImplemented.size()]); |
| 222 | |
| 223 | /* |
| 224 | * Collect the methods from all of the remote interfaces into |
| 225 | * a table, which maps from method name-and-descriptor string |
| 226 | * to Method object. |
| 227 | */ |
| 228 | Map<String,Method> methods = new HashMap<String,Method>(); |
| 229 | boolean errors = false; |
| 230 | for (ClassDoc intf : remotesImplemented) { |
| 231 | if (!collectRemoteMethods(intf, methods)) { |
| 232 | /* |
| 233 | * Continue iterating despite errors in order to |
| 234 | * generate more complete error report. |
| 235 | */ |
| 236 | errors = true; |
| 237 | } |
| 238 | } |
| 239 | if (errors) { |
| 240 | return false; |
| 241 | } |
| 242 | |
| 243 | /* |
| 244 | * Sort table of remote methods into an array. The elements |
| 245 | * are sorted in ascending order of the string of the method's |
| 246 | * name and descriptor, so that each elements index is equal |
| 247 | * to its operation number in the JDK 1.1 version of the JRMP |
| 248 | * stub/skeleton protocol. |
| 249 | */ |
| 250 | String[] orderedKeys = |
| 251 | methods.keySet().toArray(new String[methods.size()]); |
| 252 | Arrays.sort(orderedKeys); |
| 253 | remoteMethods = new Method[methods.size()]; |
| 254 | for (int i = 0; i < remoteMethods.length; i++) { |
| 255 | remoteMethods[i] = methods.get(orderedKeys[i]); |
| 256 | if (env.verbose()) { |
| 257 | String msg = "[found remote method <" + i + ">: " + |
| 258 | remoteMethods[i].operationString(); |
| 259 | ClassDoc[] exceptions = remoteMethods[i].exceptionTypes(); |
| 260 | if (exceptions.length > 0) { |
| 261 | msg += " throws "; |
| 262 | for (int j = 0; j < exceptions.length; j++) { |
| 263 | if (j > 0) { |
| 264 | msg += ", "; |
| 265 | } |
| 266 | msg += exceptions[j].qualifiedName(); |
| 267 | } |
| 268 | } |
| 269 | msg += "\n\tname and descriptor = \"" + |
| 270 | remoteMethods[i].nameAndDescriptor(); |
| 271 | msg += "\n\tmethod hash = " + |
| 272 | remoteMethods[i].methodHash() + "]"; |
| 273 | env.output(msg); |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | /* |
| 278 | * Finally, pre-compute the interface hash to be used by |
| 279 | * stubs/skeletons for this remote class in the JDK 1.1 |
| 280 | * version of the JRMP stub/skeleton protocol. |
| 281 | */ |
| 282 | interfaceHash = computeInterfaceHash(); |
| 283 | |
| 284 | return true; |
| 285 | } |
| 286 | |
| 287 | /** |
| 288 | * Collects and validates all methods from the specified interface |
| 289 | * and all of its superinterfaces as remote methods. Remote |
| 290 | * methods are added to the supplied table. Returns true if |
| 291 | * successful, or false if an error occurred. |
| 292 | **/ |
| 293 | private boolean collectRemoteMethods(ClassDoc intf, |
| 294 | Map<String,Method> table) |
| 295 | { |
| 296 | if (!intf.isInterface()) { |
| 297 | throw new AssertionError( |
| 298 | intf.qualifiedName() + " not an interface"); |
| 299 | } |
| 300 | |
| 301 | boolean errors = false; |
| 302 | |
| 303 | /* |
| 304 | * Search interface's declared methods. |
| 305 | */ |
| 306 | nextMethod: |
| 307 | for (MethodDoc method : intf.methods()) { |
| 308 | |
| 309 | /* |
| 310 | * Verify that each method throws RemoteException (or a |
| 311 | * superclass of RemoteException). |
| 312 | */ |
| 313 | boolean hasRemoteException = false; |
| 314 | for (ClassDoc ex : method.thrownExceptions()) { |
| 315 | if (env.docRemoteException().subclassOf(ex)) { |
| 316 | hasRemoteException = true; |
| 317 | break; |
| 318 | } |
| 319 | } |
| 320 | |
| 321 | /* |
| 322 | * If this method did not throw RemoteException as required, |
| 323 | * generate the error but continue, so that multiple such |
| 324 | * errors can be reported. |
| 325 | */ |
| 326 | if (!hasRemoteException) { |
| 327 | env.error("rmic.must.throw.remoteexception", |
| 328 | intf.qualifiedName(), |
| 329 | method.name() + method.signature()); |
| 330 | errors = true; |
| 331 | continue nextMethod; |
| 332 | } |
| 333 | |
| 334 | /* |
| 335 | * Verify that the implementation of this method throws only |
| 336 | * java.lang.Exception or its subclasses (fix bugid 4092486). |
| 337 | * JRMP does not support remote methods throwing |
| 338 | * java.lang.Throwable or other subclasses. |
| 339 | */ |
| 340 | MethodDoc implMethod = findImplMethod(method); |
| 341 | if (implMethod != null) { // should not be null |
| 342 | for (ClassDoc ex : implMethod.thrownExceptions()) { |
| 343 | if (!ex.subclassOf(env.docException())) { |
| 344 | env.error("rmic.must.only.throw.exception", |
| 345 | implMethod.name() + implMethod.signature(), |
| 346 | ex.qualifiedName()); |
| 347 | errors = true; |
| 348 | continue nextMethod; |
| 349 | } |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | /* |
| 354 | * Create RemoteClass.Method object to represent this method |
| 355 | * found in a remote interface. |
| 356 | */ |
| 357 | Method newMethod = new Method(method); |
| 358 | |
| 359 | /* |
| 360 | * Store remote method's representation in the table of |
| 361 | * remote methods found, keyed by its name and descriptor. |
| 362 | * |
| 363 | * If the table already contains an entry with the same |
| 364 | * method name and descriptor, then we must replace the |
| 365 | * old entry with a Method object that represents a legal |
| 366 | * combination of the old and the new methods; |
| 367 | * specifically, the combined method must have a throws |
| 368 | * clause that contains (only) all of the checked |
| 369 | * exceptions that can be thrown by both the old and the |
| 370 | * new method (see bugid 4070653). |
| 371 | */ |
| 372 | String key = newMethod.nameAndDescriptor(); |
| 373 | Method oldMethod = table.get(key); |
| 374 | if (oldMethod != null) { |
| 375 | newMethod = newMethod.mergeWith(oldMethod); |
| 376 | } |
| 377 | table.put(key, newMethod); |
| 378 | } |
| 379 | |
| 380 | /* |
| 381 | * Recursively collect methods for all superinterfaces. |
| 382 | */ |
| 383 | for (ClassDoc superintf : intf.interfaces()) { |
| 384 | if (!collectRemoteMethods(superintf, table)) { |
| 385 | errors = true; |
| 386 | } |
| 387 | } |
| 388 | |
| 389 | return !errors; |
| 390 | } |
| 391 | |
| 392 | /** |
| 393 | * Returns the MethodDoc for the method of this remote |
| 394 | * implementation class that implements the specified remote |
| 395 | * method of a remote interface. Returns null if no matching |
| 396 | * method was found in this remote implementation class. |
| 397 | **/ |
| 398 | private MethodDoc findImplMethod(MethodDoc interfaceMethod) { |
| 399 | String name = interfaceMethod.name(); |
| 400 | String desc = Util.methodDescriptorOf(interfaceMethod); |
| 401 | for (MethodDoc implMethod : implClass.methods()) { |
| 402 | if (name.equals(implMethod.name()) && |
| 403 | desc.equals(Util.methodDescriptorOf(implMethod))) |
| 404 | { |
| 405 | return implMethod; |
| 406 | } |
| 407 | } |
| 408 | return null; |
| 409 | } |
| 410 | |
| 411 | /** |
| 412 | * Computes the "interface hash" of the stub/skeleton pair for |
| 413 | * this remote implementation class. This is the 64-bit value |
| 414 | * used to enforce compatibility between a stub class and a |
| 415 | * skeleton class in the JDK 1.1 version of the JRMP stub/skeleton |
| 416 | * protocol. |
| 417 | * |
| 418 | * It is calculated using the first 64 bits of an SHA digest. The |
| 419 | * digest is of a stream consisting of the following data: |
| 420 | * (int) stub version number, always 1 |
| 421 | * for each remote method, in order of operation number: |
| 422 | * (UTF-8) method name |
| 423 | * (UTF-8) method descriptor |
| 424 | * for each declared exception, in alphabetical name order: |
| 425 | * (UTF-8) name of exception class |
| 426 | * (where "UTF-8" includes a 16-bit length prefix as written by |
| 427 | * java.io.DataOutput.writeUTF). |
| 428 | **/ |
| 429 | private long computeInterfaceHash() { |
| 430 | long hash = 0; |
| 431 | ByteArrayOutputStream sink = new ByteArrayOutputStream(512); |
| 432 | try { |
| 433 | MessageDigest md = MessageDigest.getInstance("SHA"); |
| 434 | DataOutputStream out = new DataOutputStream( |
| 435 | new DigestOutputStream(sink, md)); |
| 436 | |
| 437 | out.writeInt(INTERFACE_HASH_STUB_VERSION); |
| 438 | |
| 439 | for (Method method : remoteMethods) { |
| 440 | MethodDoc methodDoc = method.methodDoc(); |
| 441 | |
| 442 | out.writeUTF(methodDoc.name()); |
| 443 | out.writeUTF(Util.methodDescriptorOf(methodDoc)); |
| 444 | // descriptors already use binary names |
| 445 | |
| 446 | ClassDoc exceptions[] = methodDoc.thrownExceptions(); |
| 447 | Arrays.sort(exceptions, new ClassDocComparator()); |
| 448 | for (ClassDoc ex : exceptions) { |
| 449 | out.writeUTF(Util.binaryNameOf(ex)); |
| 450 | } |
| 451 | } |
| 452 | out.flush(); |
| 453 | |
| 454 | // use only the first 64 bits of the digest for the hash |
| 455 | byte hashArray[] = md.digest(); |
| 456 | for (int i = 0; i < Math.min(8, hashArray.length); i++) { |
| 457 | hash += ((long) (hashArray[i] & 0xFF)) << (i * 8); |
| 458 | } |
| 459 | } catch (IOException e) { |
| 460 | throw new AssertionError(e); |
| 461 | } catch (NoSuchAlgorithmException e) { |
| 462 | throw new AssertionError(e); |
| 463 | } |
| 464 | |
| 465 | return hash; |
| 466 | } |
| 467 | |
| 468 | /** |
| 469 | * Compares ClassDoc instances according to the lexicographic |
| 470 | * order of their binary names. |
| 471 | **/ |
| 472 | private static class ClassDocComparator implements Comparator<ClassDoc> { |
| 473 | public int compare(ClassDoc o1, ClassDoc o2) { |
| 474 | return Util.binaryNameOf(o1).compareTo(Util.binaryNameOf(o2)); |
| 475 | } |
| 476 | } |
| 477 | |
| 478 | /** |
| 479 | * Encapsulates RMI-specific information about a particular remote |
| 480 | * method in the remote implementation class represented by the |
| 481 | * enclosing RemoteClass. |
| 482 | **/ |
| 483 | final class Method implements Cloneable { |
| 484 | |
| 485 | /** |
| 486 | * MethodDoc for this remove method, from one of the remote |
| 487 | * interfaces that this method was found in. |
| 488 | * |
| 489 | * Note that this MethodDoc may be only one of multiple that |
| 490 | * correspond to this remote method object, if multiple of |
| 491 | * this class's remote interfaces contain methods with the |
| 492 | * same name and descriptor. Therefore, this MethodDoc may |
| 493 | * declare more exceptions thrown that this remote method |
| 494 | * does. |
| 495 | **/ |
| 496 | private final MethodDoc methodDoc; |
| 497 | |
| 498 | /** java.rmi.server.Operation string for this remote method */ |
| 499 | private final String operationString; |
| 500 | |
| 501 | /** name and descriptor of this remote method */ |
| 502 | private final String nameAndDescriptor; |
| 503 | |
| 504 | /** JRMP "method hash" for this remote method */ |
| 505 | private final long methodHash; |
| 506 | |
| 507 | /** |
| 508 | * Exceptions declared to be thrown by this remote method. |
| 509 | * |
| 510 | * This list may include superfluous entries, such as |
| 511 | * unchecked exceptions and subclasses of other entries. |
| 512 | **/ |
| 513 | private ClassDoc[] exceptionTypes; |
| 514 | |
| 515 | /** |
| 516 | * Creates a new Method instance for the specified method. |
| 517 | **/ |
| 518 | Method(MethodDoc methodDoc) { |
| 519 | this.methodDoc = methodDoc; |
| 520 | exceptionTypes = methodDoc.thrownExceptions(); |
| 521 | /* |
| 522 | * Sort exception types to improve consistency with |
| 523 | * previous implementations. |
| 524 | */ |
| 525 | Arrays.sort(exceptionTypes, new ClassDocComparator()); |
| 526 | operationString = computeOperationString(); |
| 527 | nameAndDescriptor = |
| 528 | methodDoc.name() + Util.methodDescriptorOf(methodDoc); |
| 529 | methodHash = computeMethodHash(); |
| 530 | } |
| 531 | |
| 532 | /** |
| 533 | * Returns the MethodDoc object corresponding to this method |
| 534 | * of a remote interface. |
| 535 | **/ |
| 536 | MethodDoc methodDoc() { |
| 537 | return methodDoc; |
| 538 | } |
| 539 | |
| 540 | /** |
| 541 | * Returns the parameter types declared by this method. |
| 542 | **/ |
| 543 | Type[] parameterTypes() { |
| 544 | Parameter[] parameters = methodDoc.parameters(); |
| 545 | Type[] paramTypes = new Type[parameters.length]; |
| 546 | for (int i = 0; i < paramTypes.length; i++) { |
| 547 | paramTypes[i] = parameters[i].type(); |
| 548 | } |
| 549 | return paramTypes; |
| 550 | } |
| 551 | |
| 552 | /** |
| 553 | * Returns the exception types declared to be thrown by this |
| 554 | * remote method. |
| 555 | * |
| 556 | * For methods with the same name and descriptor inherited |
| 557 | * from multiple remote interfaces, the array will contain the |
| 558 | * set of exceptions declared in all of the interfaces' |
| 559 | * methods that can be legally thrown by all of them. |
| 560 | **/ |
| 561 | ClassDoc[] exceptionTypes() { |
| 562 | return (ClassDoc[]) exceptionTypes.clone(); |
| 563 | } |
| 564 | |
| 565 | /** |
| 566 | * Returns the JRMP "method hash" used to identify this remote |
| 567 | * method in the JDK 1.2 version of the stub protocol. |
| 568 | **/ |
| 569 | long methodHash() { |
| 570 | return methodHash; |
| 571 | } |
| 572 | |
| 573 | /** |
| 574 | * Returns the string representation of this method |
| 575 | * appropriate for the construction of a |
| 576 | * java.rmi.server.Operation object. |
| 577 | **/ |
| 578 | String operationString() { |
| 579 | return operationString; |
| 580 | } |
| 581 | |
| 582 | /** |
| 583 | * Returns a string consisting of this method's name followed |
| 584 | * by its descriptor. |
| 585 | **/ |
| 586 | String nameAndDescriptor() { |
| 587 | return nameAndDescriptor; |
| 588 | } |
| 589 | |
| 590 | /** |
| 591 | * Returns a new Method object that is a legal combination of |
| 592 | * this Method object and another one. |
| 593 | * |
| 594 | * Doing this requires determining the exceptions declared by |
| 595 | * the combined method, which must be (only) all of the |
| 596 | * exceptions declared in both old Methods that may thrown in |
| 597 | * either of them. |
| 598 | **/ |
| 599 | Method mergeWith(Method other) { |
| 600 | if (!nameAndDescriptor().equals(other.nameAndDescriptor())) { |
| 601 | throw new AssertionError( |
| 602 | "attempt to merge method \"" + |
| 603 | other.nameAndDescriptor() + "\" with \"" + |
| 604 | nameAndDescriptor()); |
| 605 | } |
| 606 | |
| 607 | List<ClassDoc> legalExceptions = new ArrayList<ClassDoc>(); |
| 608 | collectCompatibleExceptions( |
| 609 | other.exceptionTypes, exceptionTypes, legalExceptions); |
| 610 | collectCompatibleExceptions( |
| 611 | exceptionTypes, other.exceptionTypes, legalExceptions); |
| 612 | |
| 613 | Method merged = clone(); |
| 614 | merged.exceptionTypes = |
| 615 | legalExceptions.toArray(new ClassDoc[legalExceptions.size()]); |
| 616 | |
| 617 | return merged; |
| 618 | } |
| 619 | |
| 620 | /** |
| 621 | * Cloning is supported by returning a shallow copy of this |
| 622 | * object. |
| 623 | **/ |
| 624 | protected Method clone() { |
| 625 | try { |
| 626 | return (Method) super.clone(); |
| 627 | } catch (CloneNotSupportedException e) { |
| 628 | throw new AssertionError(e); |
| 629 | } |
| 630 | } |
| 631 | |
| 632 | /** |
| 633 | * Adds to the supplied list all exceptions in the "froms" |
| 634 | * array that are subclasses of an exception in the "withs" |
| 635 | * array. |
| 636 | **/ |
| 637 | private void collectCompatibleExceptions(ClassDoc[] froms, |
| 638 | ClassDoc[] withs, |
| 639 | List<ClassDoc> list) |
| 640 | { |
| 641 | for (ClassDoc from : froms) { |
| 642 | if (!list.contains(from)) { |
| 643 | for (ClassDoc with : withs) { |
| 644 | if (from.subclassOf(with)) { |
| 645 | list.add(from); |
| 646 | break; |
| 647 | } |
| 648 | } |
| 649 | } |
| 650 | } |
| 651 | } |
| 652 | |
| 653 | /** |
| 654 | * Computes the JRMP "method hash" of this remote method. The |
| 655 | * method hash is a long containing the first 64 bits of the |
| 656 | * SHA digest from the UTF-8 encoded string of the method name |
| 657 | * and descriptor. |
| 658 | **/ |
| 659 | private long computeMethodHash() { |
| 660 | long hash = 0; |
| 661 | ByteArrayOutputStream sink = new ByteArrayOutputStream(512); |
| 662 | try { |
| 663 | MessageDigest md = MessageDigest.getInstance("SHA"); |
| 664 | DataOutputStream out = new DataOutputStream( |
| 665 | new DigestOutputStream(sink, md)); |
| 666 | |
| 667 | String methodString = nameAndDescriptor(); |
| 668 | out.writeUTF(methodString); |
| 669 | |
| 670 | // use only the first 64 bits of the digest for the hash |
| 671 | out.flush(); |
| 672 | byte hashArray[] = md.digest(); |
| 673 | for (int i = 0; i < Math.min(8, hashArray.length); i++) { |
| 674 | hash += ((long) (hashArray[i] & 0xFF)) << (i * 8); |
| 675 | } |
| 676 | } catch (IOException e) { |
| 677 | throw new AssertionError(e); |
| 678 | } catch (NoSuchAlgorithmException e) { |
| 679 | throw new AssertionError(e); |
| 680 | } |
| 681 | |
| 682 | return hash; |
| 683 | } |
| 684 | |
| 685 | /** |
| 686 | * Computes the string representation of this method |
| 687 | * appropriate for the construction of a |
| 688 | * java.rmi.server.Operation object. |
| 689 | **/ |
| 690 | private String computeOperationString() { |
| 691 | /* |
| 692 | * To be consistent with previous implementations, we use |
| 693 | * the deprecated style of placing the "[]" for the return |
| 694 | * type (if any) after the parameter list. |
| 695 | */ |
| 696 | Type returnType = methodDoc.returnType(); |
| 697 | String op = returnType.qualifiedTypeName() + " " + |
| 698 | methodDoc.name() + "("; |
| 699 | Parameter[] parameters = methodDoc.parameters(); |
| 700 | for (int i = 0; i < parameters.length; i++) { |
| 701 | if (i > 0) { |
| 702 | op += ", "; |
| 703 | } |
| 704 | op += parameters[i].type().toString(); |
| 705 | } |
| 706 | op += ")" + returnType.dimension(); |
| 707 | return op; |
| 708 | } |
| 709 | } |
| 710 | } |