J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1999-2002 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 com.sun.jndi.toolkit.ctx; |
| 27 | |
| 28 | import javax.naming.*; |
| 29 | import javax.naming.spi.ResolveResult; |
| 30 | |
| 31 | /** |
| 32 | * Clients: deal only with names for its own naming service |
| 33 | * and deals with single contexts that can be built up into |
| 34 | * hierarchical naming systems. |
| 35 | * Direct subclasses of AtomicContext must provide implementations for |
| 36 | * the abstract a_ Context methods, and c_parseComponent(). |
| 37 | * |
| 38 | * If the subclass implements the notion of implicit nns, |
| 39 | * it must override the a_*_nns Context methods as well. |
| 40 | * |
| 41 | * @author Rosanna Lee |
| 42 | * |
| 43 | */ |
| 44 | |
| 45 | public abstract class AtomicContext extends ComponentContext { |
| 46 | private static int debug = 0; |
| 47 | |
| 48 | protected AtomicContext () { |
| 49 | _contextType = _ATOMIC; |
| 50 | } |
| 51 | |
| 52 | // ------ Abstract methods whose implementation are provided by subclasses |
| 53 | |
| 54 | |
| 55 | /* Equivalent to Context methods */ |
| 56 | protected abstract Object a_lookup(String name, Continuation cont) |
| 57 | throws NamingException; |
| 58 | protected abstract Object a_lookupLink(String name, Continuation cont) |
| 59 | throws NamingException; |
| 60 | |
| 61 | protected abstract NamingEnumeration a_list( |
| 62 | Continuation cont) throws NamingException; |
| 63 | protected abstract NamingEnumeration a_listBindings( |
| 64 | Continuation cont) throws NamingException; |
| 65 | protected abstract void a_bind(String name, Object obj, Continuation cont) |
| 66 | throws NamingException; |
| 67 | protected abstract void a_rebind(String name, Object obj, Continuation cont) |
| 68 | throws NamingException; |
| 69 | protected abstract void a_unbind(String name, Continuation cont) |
| 70 | throws NamingException; |
| 71 | protected abstract void a_destroySubcontext(String name, Continuation cont) |
| 72 | throws NamingException; |
| 73 | protected abstract Context a_createSubcontext(String name, |
| 74 | Continuation cont) throws NamingException; |
| 75 | protected abstract void a_rename(String oldname, Name newname, |
| 76 | Continuation cont) throws NamingException; |
| 77 | protected abstract NameParser a_getNameParser(Continuation cont) |
| 78 | throws NamingException; |
| 79 | |
| 80 | /* Parsing */ |
| 81 | /** |
| 82 | * Parse 'inputName' into two parts: |
| 83 | * head: the first component in this name |
| 84 | * tail: the rest of the unused name. |
| 85 | * |
| 86 | * Subclasses should provide an implementation for this method |
| 87 | * which parses inputName using its own name syntax. |
| 88 | */ |
| 89 | protected abstract StringHeadTail c_parseComponent(String inputName, |
| 90 | Continuation cont) throws NamingException; |
| 91 | |
| 92 | |
| 93 | // ------ Methods that need to be overridden by subclass |
| 94 | |
| 95 | /* Resolution method for supporting federation */ |
| 96 | /** |
| 97 | * Resolves the nns for 'name' when the named context is acting |
| 98 | * as an intermediate context. |
| 99 | * |
| 100 | * For a system that supports junctions, this would be equilvalent to |
| 101 | * a_lookup(name, cont); |
| 102 | * because for junctions, an intermediate slash simply signifies |
| 103 | * a syntactic separator. |
| 104 | * |
| 105 | * For a system that supports implicit nns, this would be equivalent to |
| 106 | * a_lookup_nns(name, cont); |
| 107 | * because for implicit nns, a slash always signifies the implicit nns, |
| 108 | * regardless of whether it is intermediate or trailing. |
| 109 | * |
| 110 | * By default this method supports junctions, and also allows for an |
| 111 | * implicit nns to be dynamically determined through the use of the |
| 112 | * "nns" reference (see a_processJunction_nns()). |
| 113 | * Contexts that implement implicit nns directly should provide an |
| 114 | * appropriate override. |
| 115 | */ |
| 116 | protected Object a_resolveIntermediate_nns(String name, Continuation cont) |
| 117 | throws NamingException { |
| 118 | try { |
| 119 | final Object obj = a_lookup(name, cont); |
| 120 | |
| 121 | // Do not append "" to Continuation 'cont' even if set |
| 122 | // because the intention is to ignore the nns |
| 123 | |
| 124 | // |
| 125 | if (obj != null && getClass().isInstance(obj)) { |
| 126 | // If "obj" is in the same type as this object, it must |
| 127 | // not be a junction. Continue the lookup with "/". |
| 128 | |
| 129 | cont.setContinueNNS(obj, name, this); |
| 130 | return null; |
| 131 | |
| 132 | } else if (obj != null && !(obj instanceof Context)) { |
| 133 | // obj is not even a context, so try to find its nns |
| 134 | // dynamically by constructing a Reference containing obj. |
| 135 | RefAddr addr = new RefAddr("nns") { |
| 136 | public Object getContent() { |
| 137 | return obj; |
| 138 | } |
| 139 | private static final long serialVersionUID = |
| 140 | -3399518522645918499L; |
| 141 | }; |
| 142 | Reference ref = new Reference("java.lang.Object", addr); |
| 143 | |
| 144 | // Resolved name has trailing slash to indicate nns |
| 145 | CompositeName resName = new CompositeName(); |
| 146 | resName.add(name); |
| 147 | resName.add(""); // add trailing slash |
| 148 | |
| 149 | // Set continuation leave it to |
| 150 | // PartialCompositeContext.getPCContext() to throw CPE. |
| 151 | // Do not use setContinueNNS() because we've already |
| 152 | // consumed "/" (i.e., moved it to resName). |
| 153 | |
| 154 | cont.setContinue(ref, resName, this); |
| 155 | return null; |
| 156 | |
| 157 | } else { |
| 158 | return obj; |
| 159 | } |
| 160 | |
| 161 | } catch (NamingException e) { |
| 162 | e.appendRemainingComponent(""); // add nns back |
| 163 | throw e; |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | /* Equivalent of Context Methods for supporting nns */ |
| 168 | |
| 169 | // The following methods are called when the DirContext methods |
| 170 | // are invoked with a name that has a trailing slash. |
| 171 | // For naming systems that support implicit nns, |
| 172 | // the trailing slash signifies the implicit nns. |
| 173 | // For such naming systems, override these a_*_nns methods. |
| 174 | // |
| 175 | // For naming systems that support junctions (explicit nns), |
| 176 | // the trailing slash is meaningless because a junction does not |
| 177 | // have an implicit nns. The default implementation here |
| 178 | // throws a NameNotFoundException for such names. |
| 179 | // If a context wants to accept a trailing slash as having |
| 180 | // the same meaning as the same name without a trailing slash, |
| 181 | // then it should override these a_*_nns methods. |
| 182 | |
| 183 | |
| 184 | protected Object a_lookup_nns(String name, Continuation cont) |
| 185 | throws NamingException { |
| 186 | a_processJunction_nns(name, cont); |
| 187 | return null; |
| 188 | } |
| 189 | |
| 190 | protected Object a_lookupLink_nns(String name, Continuation cont) |
| 191 | throws NamingException { |
| 192 | a_processJunction_nns(name, cont); |
| 193 | return null; |
| 194 | } |
| 195 | |
| 196 | protected NamingEnumeration a_list_nns(Continuation cont) |
| 197 | throws NamingException { |
| 198 | a_processJunction_nns(cont); |
| 199 | return null; |
| 200 | } |
| 201 | protected NamingEnumeration a_listBindings_nns(Continuation cont) |
| 202 | throws NamingException { |
| 203 | a_processJunction_nns(cont); |
| 204 | return null; |
| 205 | } |
| 206 | |
| 207 | protected void a_bind_nns(String name, Object obj, Continuation cont) |
| 208 | throws NamingException { |
| 209 | a_processJunction_nns(name, cont); |
| 210 | } |
| 211 | |
| 212 | protected void a_rebind_nns(String name, Object obj, Continuation cont) |
| 213 | throws NamingException { |
| 214 | a_processJunction_nns(name, cont); |
| 215 | } |
| 216 | |
| 217 | protected void a_unbind_nns(String name, Continuation cont) |
| 218 | throws NamingException { |
| 219 | a_processJunction_nns(name, cont); |
| 220 | } |
| 221 | |
| 222 | protected Context a_createSubcontext_nns(String name, Continuation cont) |
| 223 | throws NamingException { |
| 224 | a_processJunction_nns(name, cont); |
| 225 | return null; |
| 226 | } |
| 227 | |
| 228 | protected void a_destroySubcontext_nns(String name, Continuation cont) |
| 229 | throws NamingException { |
| 230 | a_processJunction_nns(name, cont); |
| 231 | } |
| 232 | |
| 233 | protected void a_rename_nns(String oldname, Name newname, Continuation cont) |
| 234 | throws NamingException { |
| 235 | a_processJunction_nns(oldname, cont); |
| 236 | } |
| 237 | |
| 238 | protected NameParser a_getNameParser_nns(Continuation cont) |
| 239 | throws NamingException { |
| 240 | a_processJunction_nns(cont); |
| 241 | return null; |
| 242 | } |
| 243 | |
| 244 | |
| 245 | |
| 246 | protected boolean isEmpty(String name) { |
| 247 | return name == null || name.equals(""); |
| 248 | } |
| 249 | |
| 250 | // ------ implementations of c_ and c_*_nns methods using |
| 251 | // ------ the corresponding a_ and a_*_nns methods |
| 252 | |
| 253 | /* Equivalent to methods in Context interface */ |
| 254 | |
| 255 | protected Object c_lookup(Name name, Continuation cont) |
| 256 | throws NamingException { |
| 257 | Object ret = null; |
| 258 | if (resolve_to_penultimate_context(name, cont)) { |
| 259 | ret = a_lookup(name.toString(), cont); |
| 260 | if (ret != null && ret instanceof LinkRef) { |
| 261 | cont.setContinue(ret, name, this); |
| 262 | ret = null; |
| 263 | } |
| 264 | } |
| 265 | return ret; |
| 266 | } |
| 267 | |
| 268 | protected Object c_lookupLink(Name name, Continuation cont) |
| 269 | throws NamingException { |
| 270 | if (resolve_to_penultimate_context(name, cont)) { |
| 271 | return a_lookupLink(name.toString(), cont); |
| 272 | } |
| 273 | return null; |
| 274 | } |
| 275 | |
| 276 | protected NamingEnumeration c_list(Name name, |
| 277 | Continuation cont) throws NamingException { |
| 278 | if (resolve_to_context(name, cont)) { |
| 279 | return a_list(cont); |
| 280 | } |
| 281 | return null; |
| 282 | } |
| 283 | |
| 284 | protected NamingEnumeration c_listBindings(Name name, |
| 285 | Continuation cont) throws NamingException { |
| 286 | if (resolve_to_context(name, cont)) { |
| 287 | return a_listBindings(cont); |
| 288 | } |
| 289 | return null; |
| 290 | } |
| 291 | |
| 292 | protected void c_bind(Name name, Object obj, Continuation cont) |
| 293 | throws NamingException { |
| 294 | if (resolve_to_penultimate_context(name, cont)) |
| 295 | a_bind(name.toString(), obj, cont); |
| 296 | } |
| 297 | |
| 298 | protected void c_rebind(Name name, Object obj, Continuation cont) |
| 299 | throws NamingException { |
| 300 | if (resolve_to_penultimate_context(name, cont)) |
| 301 | a_rebind(name.toString(), obj, cont); |
| 302 | } |
| 303 | |
| 304 | protected void c_unbind(Name name, Continuation cont) |
| 305 | throws NamingException { |
| 306 | if (resolve_to_penultimate_context(name, cont)) |
| 307 | a_unbind(name.toString(), cont); |
| 308 | } |
| 309 | |
| 310 | protected void c_destroySubcontext(Name name, Continuation cont) |
| 311 | throws NamingException { |
| 312 | if (resolve_to_penultimate_context(name, cont)) |
| 313 | a_destroySubcontext(name.toString(), cont); |
| 314 | } |
| 315 | |
| 316 | protected Context c_createSubcontext(Name name, |
| 317 | Continuation cont) throws NamingException { |
| 318 | if (resolve_to_penultimate_context(name, cont)) |
| 319 | return a_createSubcontext(name.toString(), cont); |
| 320 | else |
| 321 | return null; |
| 322 | } |
| 323 | |
| 324 | protected void c_rename(Name oldname, Name newname, |
| 325 | Continuation cont) throws NamingException { |
| 326 | if (resolve_to_penultimate_context(oldname, cont)) |
| 327 | a_rename(oldname.toString(), newname, cont); |
| 328 | } |
| 329 | |
| 330 | protected NameParser c_getNameParser(Name name, |
| 331 | Continuation cont) throws NamingException { |
| 332 | if (resolve_to_context(name, cont)) |
| 333 | return a_getNameParser(cont); |
| 334 | return null; |
| 335 | } |
| 336 | |
| 337 | /* The following are overridden only for AtomicContexts. |
| 338 | * AtomicContext is used by PartialCompositeDirContext and ComponentDirContext |
| 339 | * in the inheritance tree to make use of methods in |
| 340 | * PartialCompositeContext and ComponentContext. We only want to use the |
| 341 | * atomic forms when we're actually an atomic context. |
| 342 | */ |
| 343 | |
| 344 | /* From ComponentContext */ |
| 345 | |
| 346 | protected Object c_resolveIntermediate_nns(Name name, Continuation cont) |
| 347 | throws NamingException { |
| 348 | if (_contextType == _ATOMIC) { |
| 349 | Object ret = null; |
| 350 | if (resolve_to_penultimate_context_nns(name, cont)) { |
| 351 | ret = a_resolveIntermediate_nns(name.toString(), cont); |
| 352 | if (ret != null && ret instanceof LinkRef) { |
| 353 | cont.setContinue(ret, name, this); |
| 354 | ret = null; |
| 355 | } |
| 356 | } |
| 357 | return ret; |
| 358 | } else { |
| 359 | // use ComponentContext |
| 360 | return super.c_resolveIntermediate_nns(name, cont); |
| 361 | } |
| 362 | } |
| 363 | |
| 364 | /* Equivalent to methods in Context interface for nns */ |
| 365 | |
| 366 | protected Object c_lookup_nns(Name name, Continuation cont) |
| 367 | throws NamingException { |
| 368 | if (_contextType == _ATOMIC) { |
| 369 | Object ret = null; |
| 370 | if (resolve_to_penultimate_context_nns(name, cont)) { |
| 371 | ret = a_lookup_nns(name.toString(), cont); |
| 372 | if (ret != null && ret instanceof LinkRef) { |
| 373 | cont.setContinue(ret, name, this); |
| 374 | ret = null; |
| 375 | } |
| 376 | } |
| 377 | return ret; |
| 378 | } else { |
| 379 | return super.c_lookup_nns(name, cont); |
| 380 | } |
| 381 | } |
| 382 | |
| 383 | protected Object c_lookupLink_nns(Name name, Continuation cont) |
| 384 | throws NamingException { |
| 385 | if (_contextType == _ATOMIC) { |
| 386 | // %%% check logic |
| 387 | resolve_to_nns_and_continue(name, cont); |
| 388 | return null; |
| 389 | } else { |
| 390 | // use ComponentContext |
| 391 | return super.c_lookupLink_nns(name, cont); |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | protected NamingEnumeration c_list_nns(Name name, |
| 396 | Continuation cont) throws NamingException { |
| 397 | if (_contextType == _ATOMIC) { |
| 398 | resolve_to_nns_and_continue(name, cont); |
| 399 | return null; |
| 400 | } else { |
| 401 | // use ComponentContext |
| 402 | return super.c_list_nns(name, cont); |
| 403 | } |
| 404 | } |
| 405 | |
| 406 | protected NamingEnumeration c_listBindings_nns(Name name, |
| 407 | Continuation cont) throws NamingException { |
| 408 | if (_contextType == _ATOMIC) { |
| 409 | resolve_to_nns_and_continue(name, cont); |
| 410 | return null; |
| 411 | } else { |
| 412 | // use ComponentContext |
| 413 | return super.c_list_nns(name, cont); |
| 414 | } |
| 415 | } |
| 416 | |
| 417 | protected void c_bind_nns(Name name, Object obj, Continuation cont) |
| 418 | throws NamingException { |
| 419 | if (_contextType == _ATOMIC) { |
| 420 | if (resolve_to_penultimate_context_nns(name, cont)) |
| 421 | a_bind_nns(name.toString(), obj, cont); |
| 422 | } else { |
| 423 | // use ComponentContext |
| 424 | super.c_bind_nns(name, obj, cont); |
| 425 | } |
| 426 | } |
| 427 | |
| 428 | protected void c_rebind_nns(Name name, Object obj, Continuation cont) |
| 429 | throws NamingException { |
| 430 | if (_contextType == _ATOMIC) { |
| 431 | if (resolve_to_penultimate_context_nns(name, cont)) |
| 432 | a_rebind_nns(name.toString(), obj, cont); |
| 433 | } else { |
| 434 | // use ComponentContext |
| 435 | super.c_rebind_nns(name, obj, cont); |
| 436 | } |
| 437 | } |
| 438 | |
| 439 | protected void c_unbind_nns(Name name, Continuation cont) |
| 440 | throws NamingException { |
| 441 | if (_contextType == _ATOMIC) { |
| 442 | if (resolve_to_penultimate_context_nns(name, cont)) |
| 443 | a_unbind_nns(name.toString(), cont); |
| 444 | } else { |
| 445 | // use ComponentContext |
| 446 | super.c_unbind_nns(name, cont); |
| 447 | } |
| 448 | } |
| 449 | |
| 450 | protected Context c_createSubcontext_nns(Name name, |
| 451 | Continuation cont) throws NamingException { |
| 452 | if (_contextType == _ATOMIC) { |
| 453 | if (resolve_to_penultimate_context_nns(name, cont)) |
| 454 | return a_createSubcontext_nns(name.toString(), cont); |
| 455 | else |
| 456 | return null; |
| 457 | } else { |
| 458 | // use ComponentContext |
| 459 | return super.c_createSubcontext_nns(name, cont); |
| 460 | } |
| 461 | } |
| 462 | |
| 463 | protected void c_destroySubcontext_nns(Name name, Continuation cont) |
| 464 | throws NamingException { |
| 465 | if (_contextType == _ATOMIC) { |
| 466 | if (resolve_to_penultimate_context_nns(name, cont)) |
| 467 | a_destroySubcontext_nns(name.toString(), cont); |
| 468 | } else { |
| 469 | // use ComponentContext |
| 470 | super.c_destroySubcontext_nns(name, cont); |
| 471 | } |
| 472 | } |
| 473 | |
| 474 | protected void c_rename_nns(Name oldname, Name newname, Continuation cont) |
| 475 | throws NamingException { |
| 476 | if (_contextType == _ATOMIC) { |
| 477 | if (resolve_to_penultimate_context_nns(oldname, cont)) |
| 478 | a_rename_nns(oldname.toString(), newname, cont); |
| 479 | } else { |
| 480 | // use ComponentContext |
| 481 | super.c_rename_nns(oldname, newname, cont); |
| 482 | } |
| 483 | } |
| 484 | |
| 485 | protected NameParser c_getNameParser_nns(Name name, Continuation cont) |
| 486 | throws NamingException { |
| 487 | if (_contextType == _ATOMIC) { |
| 488 | resolve_to_nns_and_continue(name, cont); |
| 489 | return null; |
| 490 | } else { |
| 491 | // use COmponentContext |
| 492 | return super.c_getNameParser_nns(name, cont); |
| 493 | } |
| 494 | } |
| 495 | |
| 496 | // -------------- internal methods used by this class |
| 497 | |
| 498 | /* Handles nns for junctions */ |
| 499 | /** |
| 500 | * This function is used when implementing a naming system that |
| 501 | * supports junctions. For example, when the a_bind_nns(name, newobj) |
| 502 | * method is invoked, that means the caller is attempting to bind the |
| 503 | * object 'newobj' to the nns of 'name'. For context that supports |
| 504 | * junctions, 'name' names a junction and is pointing to the root |
| 505 | * of another naming system, which in turn might have an nns. |
| 506 | * This means that a_bind_nns() should first resolve 'name' and attempt to |
| 507 | * continue the operation in the context named by 'name'. (i.e. bind |
| 508 | * to the nns of the context named by 'name'). |
| 509 | * If name is already empty, then throw NameNotFoundException because |
| 510 | * this context by default does not have any nns. |
| 511 | */ |
| 512 | protected void a_processJunction_nns(String name, Continuation cont) |
| 513 | throws NamingException { |
| 514 | if (name.equals("")) { |
| 515 | NameNotFoundException e = new NameNotFoundException(); |
| 516 | cont.setErrorNNS(this, name); |
| 517 | throw cont.fillInException(e); |
| 518 | } |
| 519 | try { |
| 520 | // lookup name to continue operation in nns |
| 521 | Object target = a_lookup(name, cont); |
| 522 | if (cont.isContinue()) |
| 523 | cont.appendRemainingComponent(""); // add nns back |
| 524 | else { |
| 525 | cont.setContinueNNS(target, name, this); |
| 526 | } |
| 527 | } catch (NamingException e) { |
| 528 | e.appendRemainingComponent(""); // add nns back |
| 529 | throw e; |
| 530 | } |
| 531 | } |
| 532 | |
| 533 | /** |
| 534 | * This function is used when implementing a naming system that |
| 535 | * supports junctions. For example, when the a_list_nns(newobj) |
| 536 | * method is invoked, that means the caller is attempting to list the |
| 537 | * the nns context of of this context. For a context that supports |
| 538 | * junctions, it by default does not have any nns. Consequently, |
| 539 | * a NameNotFoundException is thrown. |
| 540 | */ |
| 541 | protected void a_processJunction_nns(Continuation cont) throws NamingException { |
| 542 | |
| 543 | // Construct a new Reference that contains this context. |
| 544 | RefAddr addr = new RefAddr("nns") { |
| 545 | public Object getContent() { |
| 546 | return AtomicContext.this; |
| 547 | } |
| 548 | private static final long serialVersionUID = 3449785852664978312L; |
| 549 | }; |
| 550 | Reference ref = new Reference("java.lang.Object", addr); |
| 551 | |
| 552 | // Set continuation leave it to PartialCompositeContext.getPCContext() |
| 553 | // to throw the exception. |
| 554 | // Do not use setContinueNNS() because we've are |
| 555 | // setting relativeResolvedName to "/". |
| 556 | cont.setContinue(ref, _NNS_NAME, this); |
| 557 | } |
| 558 | |
| 559 | /* *********** core resolution routines ******************* */ |
| 560 | |
| 561 | /** Resolve to context named by 'name'. |
| 562 | * Returns true if at named context (i.e. 'name' is empty name). |
| 563 | * Returns false otherwise, and sets Continuation on parts of 'name' |
| 564 | * not yet resolved. |
| 565 | */ |
| 566 | protected boolean resolve_to_context(Name name, Continuation cont) |
| 567 | throws NamingException { |
| 568 | String target = name.toString(); |
| 569 | |
| 570 | |
| 571 | StringHeadTail ht = c_parseComponent(target, cont); |
| 572 | String tail = ht.getTail(); |
| 573 | String head = ht.getHead(); |
| 574 | |
| 575 | if (debug > 0) |
| 576 | System.out.println("RESOLVE TO CONTEXT(" + target + ") = {" + |
| 577 | head + ", " + tail + "}"); |
| 578 | |
| 579 | if (head == null) { |
| 580 | // something is wrong; no name at all |
| 581 | InvalidNameException e = new InvalidNameException(); |
| 582 | throw cont.fillInException(e); |
| 583 | } |
| 584 | if (!isEmpty(head)) { |
| 585 | // if there is head is a non-empty name |
| 586 | // this means more resolution to be done |
| 587 | try { |
| 588 | Object headCtx = a_lookup(head, cont); |
| 589 | // System.out.println("answer " + headCtx); |
| 590 | if (headCtx != null) |
| 591 | cont.setContinue(headCtx, head, this, (tail == null ? "" : tail)); |
| 592 | else if (cont.isContinue()) |
| 593 | cont.appendRemainingComponent(tail); |
| 594 | } catch (NamingException e) { |
| 595 | e.appendRemainingComponent(tail); |
| 596 | throw e; |
| 597 | } |
| 598 | } else { |
| 599 | cont.setSuccess(); // clear |
| 600 | return true; |
| 601 | } |
| 602 | return false; |
| 603 | } |
| 604 | |
| 605 | /** |
| 606 | * Resolves to penultimate context named by 'name'. |
| 607 | * Returns true if penultimate context has been reached (i.e. name |
| 608 | * only has one atomic component left). |
| 609 | * Returns false otherwise, and sets Continuation to parts of name |
| 610 | * not yet resolved. |
| 611 | */ |
| 612 | protected boolean resolve_to_penultimate_context(Name name, Continuation cont) |
| 613 | throws NamingException { |
| 614 | String target = name.toString(); |
| 615 | |
| 616 | if (debug > 0) |
| 617 | System.out.println("RESOLVE TO PENULTIMATE" + target); |
| 618 | |
| 619 | StringHeadTail ht = c_parseComponent(target, cont); |
| 620 | String tail = ht.getTail(); |
| 621 | String head = ht.getHead(); |
| 622 | if (head == null) { |
| 623 | // something is wrong; no name at all |
| 624 | InvalidNameException e = new InvalidNameException(); |
| 625 | throw cont.fillInException(e); |
| 626 | } |
| 627 | |
| 628 | if (!isEmpty(tail)) { |
| 629 | // more components; hence not at penultimate context yet |
| 630 | try { |
| 631 | Object headCtx = a_lookup(head, cont); |
| 632 | if (headCtx != null) |
| 633 | cont.setContinue(headCtx, head, this, tail); |
| 634 | else if (cont.isContinue()) |
| 635 | cont.appendRemainingComponent(tail); |
| 636 | } catch (NamingException e) { |
| 637 | e.appendRemainingComponent(tail); |
| 638 | throw e; |
| 639 | } |
| 640 | } else { |
| 641 | // already at penultimate context |
| 642 | cont.setSuccess(); // clear |
| 643 | return true; |
| 644 | } |
| 645 | return false; |
| 646 | } |
| 647 | |
| 648 | /** |
| 649 | * This function is similar to resolve_to_penultimate_context() |
| 650 | * except it should only be called by the nns() functions. |
| 651 | * This function fixes any exception or continuations so that |
| 652 | * it will have the proper nns name. |
| 653 | */ |
| 654 | protected boolean resolve_to_penultimate_context_nns(Name name, |
| 655 | Continuation cont) |
| 656 | throws NamingException { |
| 657 | try { |
| 658 | if (debug > 0) |
| 659 | System.out.println("RESOLVE TO PENULTIMATE NNS" + name.toString()); |
| 660 | boolean answer = resolve_to_penultimate_context(name, cont); |
| 661 | |
| 662 | // resolve_to_penultimate_context() only calls a_lookup(). |
| 663 | // Any continuation it sets is lacking the nns, so |
| 664 | // we need to add it back |
| 665 | if (cont.isContinue()) |
| 666 | cont.appendRemainingComponent(""); |
| 667 | |
| 668 | return answer; |
| 669 | } catch (NamingException e) { |
| 670 | // resolve_to_penultimate_context() only calls a_lookup(). |
| 671 | // Any exceptions it throws is lacking the nns, so |
| 672 | // we need to add it back. |
| 673 | e.appendRemainingComponent(""); |
| 674 | throw e; |
| 675 | } |
| 676 | } |
| 677 | |
| 678 | /** |
| 679 | * Resolves to nns associated with 'name' and set Continuation |
| 680 | * to the result. |
| 681 | */ |
| 682 | protected void resolve_to_nns_and_continue(Name name, Continuation cont) |
| 683 | throws NamingException { |
| 684 | if (debug > 0) |
| 685 | System.out.println("RESOLVE TO NNS AND CONTINUE" + name.toString()); |
| 686 | |
| 687 | if (resolve_to_penultimate_context_nns(name, cont)) { |
| 688 | Object nns = a_lookup_nns(name.toString(), cont); |
| 689 | if (nns != null) |
| 690 | cont.setContinue(nns, name, this); |
| 691 | } |
| 692 | } |
| 693 | } |