| 1 | /* |
| 2 | |
| 3 | Derby - Class org.apache.derby.iapi.sql.dictionary.TriggerDescriptor |
| 4 | |
| 5 | Copyright 1999, 2004 The Apache Software Foundation or its licensors, as applicable. |
| 6 | |
| 7 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 | you may not use this file except in compliance with the License. |
| 9 | You may obtain a copy of the License at |
| 10 | |
| 11 | http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | |
| 13 | Unless required by applicable law or agreed to in writing, software |
| 14 | distributed under the License is distributed on an "AS IS" BASIS, |
| 15 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | See the License for the specific language governing permissions and |
| 17 | limitations under the License. |
| 18 | |
| 19 | */ |
| 20 | |
| 21 | package org.apache.derby.iapi.sql.dictionary; |
| 22 | |
| 23 | import org.apache.derby.iapi.services.io.Formatable; |
| 24 | import org.apache.derby.iapi.sql.depend.Dependent; |
| 25 | import org.apache.derby.iapi.sql.depend.Provider; |
| 26 | import org.apache.derby.iapi.error.StandardException; |
| 27 | import org.apache.derby.catalog.ReferencedColumns; |
| 28 | import org.apache.derby.catalog.UUID; |
| 29 | import java.sql.Timestamp; |
| 30 | |
| 31 | import org.apache.derby.iapi.reference.SQLState; |
| 32 | import org.apache.derby.iapi.services.sanity.SanityManager; |
| 33 | import org.apache.derby.iapi.sql.StatementType; |
| 34 | import org.apache.derby.catalog.DependableFinder; |
| 35 | import org.apache.derby.catalog.Dependable; |
| 36 | import org.apache.derby.iapi.services.io.StoredFormatIds; |
| 37 | import org.apache.derby.iapi.error.StandardException; |
| 38 | import org.apache.derby.iapi.sql.depend.DependencyManager; |
| 39 | import org.apache.derby.iapi.sql.depend.Dependent; |
| 40 | import org.apache.derby.iapi.sql.depend.Dependency; |
| 41 | import org.apache.derby.iapi.sql.depend.Provider; |
| 42 | import org.apache.derby.iapi.sql.conn.LanguageConnectionContext; |
| 43 | import org.apache.derby.iapi.services.context.ContextManager; |
| 44 | import org.apache.derby.iapi.services.context.ContextService; |
| 45 | import java.io.ObjectOutput; |
| 46 | import java.io.ObjectInput; |
| 47 | import java.io.IOException; |
| 48 | |
| 49 | /** |
| 50 | * A trigger. |
| 51 | * <p> |
| 52 | * We are dependent on TableDescriptors, SPSDescriptors (for our |
| 53 | * WHEN clause and our action). Note that we don't strictly |
| 54 | * need to be dependent on out SPSes because we could just disallow |
| 55 | * anyone from dropping an sps of type 'T', but to keep dependencies |
| 56 | * uniform, we'll do be dependent. |
| 57 | * <p> |
| 58 | * We are a provider for DML (PreparedStatements or SPSes) |
| 59 | * |
| 60 | * The public methods for this class are: |
| 61 | * |
| 62 | * <ol> |
| 63 | * <li>getUUID |
| 64 | * <li>getName |
| 65 | * <li>getSchemaDescriptor |
| 66 | * <li> public boolean listensForEvent(int event); |
| 67 | * <li> public int getTriggerEventMask(); |
| 68 | * <li> public Timestamp getCreationTimestamp(); |
| 69 | * <li> public boolean isBeforeTrigger(); |
| 70 | * <li> public boolean isRowTrigger(); |
| 71 | * <li> public UUID getActionId(); |
| 72 | * <li> public SPSDescriptor getActionSPS(); |
| 73 | * <li> public UUID getWhenClauseId(); |
| 74 | * <li> public SPSDescriptor getWhenClauseSPS() |
| 75 | * <li> public TableDescriptor getTableDescriptor() |
| 76 | * <li> public ReferencedColumns getReferencedColumnsDescriptor() |
| 77 | * <li> public int[] getReferencedCols(); |
| 78 | * <li> public boolean isEnabled(); |
| 79 | * <li> public void setEnabled(); |
| 80 | * <li> public void setDisabled(); |
| 81 | * <li> public boolean needsToFire(int stmtType, int[] modifiedCols) |
| 82 | * <li> public String getTriggerDefinition(); |
| 83 | * <li> public boolean getReferencingOld(); |
| 84 | * <li> public boolean getReferencingNew(); |
| 85 | * <li> public String getOldReferencingName(); |
| 86 | * <li> public String getNewReferencingName(); |
| 87 | * </ol> |
| 88 | * @author Jamie |
| 89 | */ |
| 90 | public class TriggerDescriptor extends TupleDescriptor |
| 91 | implements UniqueSQLObjectDescriptor, Provider, Dependent, Formatable |
| 92 | { |
| 93 | // field that we want users to be able to know about |
| 94 | public static final int SYSTRIGGERS_STATE_FIELD = 8; |
| 95 | |
| 96 | public static final int TRIGGER_EVENT_UPDATE = 1; |
| 97 | public static final int TRIGGER_EVENT_DELETE = 2; |
| 98 | public static final int TRIGGER_EVENT_INSERT = 4; |
| 99 | |
| 100 | |
| 101 | private UUID id; |
| 102 | private String name; |
| 103 | private String oldReferencingName; |
| 104 | private String newReferencingName; |
| 105 | private String triggerDefinition; |
| 106 | private SchemaDescriptor sd; |
| 107 | private int eventMask; |
| 108 | private boolean isBefore; |
| 109 | private boolean isRow; |
| 110 | private boolean referencingOld; |
| 111 | private boolean referencingNew; |
| 112 | private TableDescriptor td; |
| 113 | private UUID actionSPSId; |
| 114 | private SPSDescriptor actionSPS; |
| 115 | private UUID whenSPSId; |
| 116 | private SPSDescriptor whenSPS; |
| 117 | private boolean isEnabled; |
| 118 | private int[] referencedCols; |
| 119 | private Timestamp creationTimestamp; |
| 120 | private UUID triggerSchemaId; |
| 121 | private UUID triggerTableId; |
| 122 | |
| 123 | |
| 124 | /** |
| 125 | * Niladic constructor, for formatable |
| 126 | */ |
| 127 | public TriggerDescriptor() {} |
| 128 | |
| 129 | /** |
| 130 | * Constructor. Used when creating a trigger from SYS.SYSTRIGGERS |
| 131 | * |
| 132 | * @param dataDictionary the data dictionary |
| 133 | * @param sd the schema descriptor for this trigger |
| 134 | * @param id the trigger id |
| 135 | * @param name the trigger name |
| 136 | * @param eventMask TriggerDescriptor.TRIGGER_EVENT_XXXX |
| 137 | * @param isBefore is this a before (as opposed to after) trigger |
| 138 | * @param isRow is this a row trigger or statement trigger |
| 139 | * @param isEnabled is this trigger enabled or disabled |
| 140 | * @param td the table upon which this trigger is defined |
| 141 | * @param whenSPSId the sps id for the when clause (may be null) |
| 142 | * @param actionSPSId the spsid for the trigger action (may be null) |
| 143 | * @param creationTimestamp when was this trigger created? |
| 144 | * @param referencedCols what columns does this trigger reference (may be null) |
| 145 | * @param triggerDefinition The original user text of the trigger action |
| 146 | * @param referencingOld whether or not OLD appears in REFERENCING clause |
| 147 | * @param referencingNew whether or not NEW appears in REFERENCING clause |
| 148 | * @param oldReferencingName old referencing table name, if any, that appears in REFERCING clause |
| 149 | * @param newReferencingName new referencing table name, if any, that appears in REFERCING clause |
| 150 | */ |
| 151 | public TriggerDescriptor |
| 152 | ( |
| 153 | DataDictionary dataDictionary, |
| 154 | SchemaDescriptor sd, |
| 155 | UUID id, |
| 156 | String name, |
| 157 | int eventMask, |
| 158 | boolean isBefore, |
| 159 | boolean isRow, |
| 160 | boolean isEnabled, |
| 161 | TableDescriptor td, |
| 162 | UUID whenSPSId, |
| 163 | UUID actionSPSId, |
| 164 | Timestamp creationTimestamp, |
| 165 | int[] referencedCols, |
| 166 | String triggerDefinition, |
| 167 | boolean referencingOld, |
| 168 | boolean referencingNew, |
| 169 | String oldReferencingName, |
| 170 | String newReferencingName |
| 171 | ) |
| 172 | { |
| 173 | super(dataDictionary); |
| 174 | this.id = id; |
| 175 | this.sd = sd; |
| 176 | this.name = name; |
| 177 | this.eventMask = eventMask; |
| 178 | this.isBefore = isBefore; |
| 179 | this.isRow = isRow; |
| 180 | this.td = td; |
| 181 | this.actionSPSId = actionSPSId; |
| 182 | this.whenSPSId = whenSPSId; |
| 183 | this.isEnabled = isEnabled; |
| 184 | this.referencedCols = referencedCols; |
| 185 | this.creationTimestamp = creationTimestamp; |
| 186 | this.triggerDefinition = triggerDefinition; |
| 187 | this.referencingOld = referencingOld; |
| 188 | this.referencingNew = referencingNew; |
| 189 | this.oldReferencingName = oldReferencingName; |
| 190 | this.newReferencingName = newReferencingName; |
| 191 | triggerSchemaId = sd.getUUID(); |
| 192 | triggerTableId = td.getUUID(); |
| 193 | } |
| 194 | |
| 195 | |
| 196 | /** |
| 197 | * Get the trigger UUID |
| 198 | * |
| 199 | * @return the id |
| 200 | */ |
| 201 | public UUID getUUID() |
| 202 | { |
| 203 | return id; |
| 204 | } |
| 205 | |
| 206 | /** |
| 207 | * Get the trigger name |
| 208 | * |
| 209 | * @return the name |
| 210 | */ |
| 211 | public String getName() |
| 212 | { |
| 213 | return name; |
| 214 | } |
| 215 | |
| 216 | public UUID getTableId() { |
| 217 | return triggerTableId; |
| 218 | } |
| 219 | |
| 220 | /** |
| 221 | * Get the triggers schema descriptor |
| 222 | * |
| 223 | * @return the schema descriptor |
| 224 | * |
| 225 | * @exception StandardException on error |
| 226 | */ |
| 227 | public SchemaDescriptor getSchemaDescriptor() |
| 228 | throws StandardException |
| 229 | { |
| 230 | if (sd == null) |
| 231 | { |
| 232 | sd = getDataDictionary().getSchemaDescriptor(triggerSchemaId, null); |
| 233 | } |
| 234 | return sd; |
| 235 | } |
| 236 | |
| 237 | /** |
| 238 | * Indicate whether this trigger listens for this |
| 239 | * type of event. |
| 240 | * |
| 241 | * @param event TRIGGER_EVENT_XXXX |
| 242 | * |
| 243 | * @return true if it listens to the specified event. |
| 244 | */ |
| 245 | public boolean listensForEvent(int event) |
| 246 | { |
| 247 | return (event & eventMask) == event; |
| 248 | } |
| 249 | |
| 250 | |
| 251 | /** |
| 252 | * Get the trigger event mask. Currently, a trigger |
| 253 | * may only listen for a single event, though it may |
| 254 | * OR multiple events in the future. |
| 255 | * |
| 256 | * @return the trigger event mask |
| 257 | */ |
| 258 | public int getTriggerEventMask() |
| 259 | { |
| 260 | return eventMask; |
| 261 | } |
| 262 | |
| 263 | /** |
| 264 | * Get the time that this trigger was created. |
| 265 | * |
| 266 | * @return the time the trigger was created |
| 267 | */ |
| 268 | public Timestamp getCreationTimestamp() |
| 269 | { |
| 270 | return creationTimestamp; |
| 271 | } |
| 272 | |
| 273 | /** |
| 274 | * Is this a before trigger |
| 275 | * |
| 276 | * @return true if it is a before trigger |
| 277 | */ |
| 278 | public boolean isBeforeTrigger() |
| 279 | { |
| 280 | return isBefore; |
| 281 | } |
| 282 | |
| 283 | /** |
| 284 | * Is this a row trigger |
| 285 | * |
| 286 | * @return true if it is a before trigger |
| 287 | */ |
| 288 | public boolean isRowTrigger() |
| 289 | { |
| 290 | return isRow; |
| 291 | } |
| 292 | |
| 293 | |
| 294 | /** |
| 295 | * Get the trigger action sps UUID |
| 296 | * |
| 297 | * @return the uuid of the sps action |
| 298 | */ |
| 299 | public UUID getActionId() |
| 300 | { |
| 301 | return actionSPSId; |
| 302 | } |
| 303 | |
| 304 | /** |
| 305 | * Get the trigger action sps |
| 306 | * |
| 307 | * @return the trigger action sps |
| 308 | * |
| 309 | * @exception StandardException on error |
| 310 | */ |
| 311 | public SPSDescriptor getActionSPS(LanguageConnectionContext lcc) |
| 312 | throws StandardException |
| 313 | { |
| 314 | if (actionSPS == null) |
| 315 | { |
| 316 | //bug 4821 - do the sysstatement look up in a nested readonly |
| 317 | //transaction rather than in the user transaction. Because of |
| 318 | //this, the nested compile transaction which is attempting to |
| 319 | //compile the trigger will not run into any locking issues with |
| 320 | //the user transaction for sysstatements. |
| 321 | lcc.beginNestedTransaction(true); |
| 322 | actionSPS = getDataDictionary().getSPSDescriptor(actionSPSId); |
| 323 | lcc.commitNestedTransaction(); |
| 324 | } |
| 325 | return actionSPS; |
| 326 | } |
| 327 | |
| 328 | /** |
| 329 | * Get the trigger when clause sps UUID |
| 330 | * |
| 331 | * @return the uuid of the sps action |
| 332 | */ |
| 333 | public UUID getWhenClauseId() |
| 334 | { |
| 335 | return whenSPSId; |
| 336 | } |
| 337 | |
| 338 | /** |
| 339 | * Get the trigger when clause sps |
| 340 | * |
| 341 | * @return the sps of the when clause |
| 342 | * |
| 343 | * @exception StandardException on error |
| 344 | */ |
| 345 | public SPSDescriptor getWhenClauseSPS() |
| 346 | throws StandardException |
| 347 | { |
| 348 | if (whenSPS == null) |
| 349 | { |
| 350 | whenSPS = getDataDictionary().getSPSDescriptor(whenSPSId); |
| 351 | } |
| 352 | return whenSPS; |
| 353 | } |
| 354 | |
| 355 | /** |
| 356 | * Get the trigger table descriptor |
| 357 | * |
| 358 | * @return the table descripor upon which this trigger |
| 359 | * is declared |
| 360 | * |
| 361 | * @exception StandardException on error |
| 362 | */ |
| 363 | public TableDescriptor getTableDescriptor() |
| 364 | throws StandardException |
| 365 | { |
| 366 | if (td == null) |
| 367 | { |
| 368 | td = getDataDictionary().getTableDescriptor(triggerTableId); |
| 369 | } |
| 370 | return td; |
| 371 | } |
| 372 | |
| 373 | /** |
| 374 | * Get the referenced table descriptor for this trigger. |
| 375 | * |
| 376 | * @return the referenced table descriptor |
| 377 | * |
| 378 | * @exception StandardException on error |
| 379 | */ |
| 380 | // caller converts referencedCols to referencedColsDescriptor... |
| 381 | // public ReferencedColumns getReferencedColumnsDescriptor() |
| 382 | // throws StandardException |
| 383 | // { |
| 384 | // return (referencedCols == null) ? |
| 385 | // (ReferencedColumns)null : |
| 386 | // new ReferencedColumnsDescriptorImpl(referencedCols); |
| 387 | // } |
| 388 | |
| 389 | /** |
| 390 | * Get the referenced column array for this trigger, used in "alter table |
| 391 | * drop column", we get the handle and change it |
| 392 | * |
| 393 | * @return the referenced column array |
| 394 | */ |
| 395 | public int[] getReferencedCols() |
| 396 | { |
| 397 | return referencedCols; |
| 398 | } |
| 399 | |
| 400 | /** |
| 401 | * Is this trigger enabled |
| 402 | * |
| 403 | * @return true if it is enabled |
| 404 | */ |
| 405 | public boolean isEnabled() |
| 406 | { |
| 407 | return isEnabled; |
| 408 | } |
| 409 | |
| 410 | /** |
| 411 | * Mark this trigger as enabled |
| 412 | * |
| 413 | */ |
| 414 | public void setEnabled() |
| 415 | { |
| 416 | isEnabled = true; |
| 417 | } |
| 418 | |
| 419 | /** |
| 420 | * Mark this trigger as disabled |
| 421 | * |
| 422 | */ |
| 423 | public void setDisabled() |
| 424 | { |
| 425 | isEnabled = false; |
| 426 | } |
| 427 | |
| 428 | /** |
| 429 | * Does this trigger need to fire on this type of |
| 430 | * DML? |
| 431 | * |
| 432 | * @param stmtType the type of DML |
| 433 | * (StatementType.INSERT|StatementType.UPDATE|StatementType.DELETE) |
| 434 | * @param modifiedCols the columns modified, or null for all |
| 435 | * |
| 436 | * @return true/false |
| 437 | * |
| 438 | * @exception StandardException on error |
| 439 | */ |
| 440 | public boolean needsToFire(int stmtType, int[] modifiedCols) |
| 441 | throws StandardException |
| 442 | { |
| 443 | |
| 444 | if (SanityManager.DEBUG) |
| 445 | { |
| 446 | if (!((stmtType == StatementType.INSERT) || |
| 447 | (stmtType == StatementType.BULK_INSERT_REPLACE) || |
| 448 | (stmtType == StatementType.UPDATE) || |
| 449 | (stmtType == StatementType.DELETE))) |
| 450 | { |
| 451 | SanityManager.THROWASSERT("invalid statement type "+stmtType); |
| 452 | } |
| 453 | } |
| 454 | |
| 455 | /* |
| 456 | ** If we are disabled, we never fire |
| 457 | */ |
| 458 | if (!isEnabled) |
| 459 | { |
| 460 | return false; |
| 461 | } |
| 462 | |
| 463 | if (stmtType == StatementType.INSERT) |
| 464 | { |
| 465 | return (eventMask & TRIGGER_EVENT_INSERT) == eventMask; |
| 466 | } |
| 467 | if (stmtType == StatementType.DELETE) |
| 468 | { |
| 469 | return (eventMask & TRIGGER_EVENT_DELETE) == eventMask; |
| 470 | } |
| 471 | |
| 472 | // this is a temporary restriction, but it may not be lifted |
| 473 | // anytime soon. |
| 474 | if (stmtType == StatementType.BULK_INSERT_REPLACE) |
| 475 | { |
| 476 | throw StandardException.newException(SQLState.LANG_NO_BULK_INSERT_REPLACE_WITH_TRIGGER, |
| 477 | getTableDescriptor().getQualifiedName(), name); |
| 478 | } |
| 479 | |
| 480 | // if update, only relevant if columns intersect |
| 481 | return ((eventMask & TRIGGER_EVENT_UPDATE) == eventMask) && |
| 482 | ConstraintDescriptor.doColumnsIntersect(modifiedCols, referencedCols); |
| 483 | } |
| 484 | |
| 485 | /** |
| 486 | * Get the original trigger definition. |
| 487 | * |
| 488 | * @return The trigger definition. |
| 489 | */ |
| 490 | public String getTriggerDefinition() |
| 491 | { |
| 492 | return triggerDefinition; |
| 493 | } |
| 494 | |
| 495 | /** |
| 496 | * Get whether or not OLD was replaced |
| 497 | * in the REFERENCING clause. |
| 498 | * |
| 499 | * @return Whether or not OLD was replaced |
| 500 | * in the REFERENCING clause. |
| 501 | */ |
| 502 | public boolean getReferencingOld() |
| 503 | { |
| 504 | return referencingOld; |
| 505 | } |
| 506 | |
| 507 | /** |
| 508 | * Get whether or not NEW was replaced |
| 509 | * in the REFERENCING clause. |
| 510 | * |
| 511 | * @return Whether or not NEW was replaced |
| 512 | * in the REFERENCING clause. |
| 513 | */ |
| 514 | public boolean getReferencingNew() |
| 515 | { |
| 516 | return referencingNew; |
| 517 | } |
| 518 | |
| 519 | /** |
| 520 | * Get the old Referencing name, if any, |
| 521 | * from the REFERENCING clause. |
| 522 | * |
| 523 | * @return The old Referencing name, if any, |
| 524 | * from the REFERENCING clause. |
| 525 | */ |
| 526 | public String getOldReferencingName() |
| 527 | { |
| 528 | return oldReferencingName; |
| 529 | } |
| 530 | |
| 531 | /** |
| 532 | * Get the new Referencing name, if any, |
| 533 | * from the REFERENCING clause. |
| 534 | * |
| 535 | * @return The new Referencing name, if any, |
| 536 | * from the REFERENCING clause. |
| 537 | */ |
| 538 | public String getNewReferencingName() |
| 539 | { |
| 540 | return newReferencingName; |
| 541 | } |
| 542 | |
| 543 | public String toString() |
| 544 | { |
| 545 | if (SanityManager.DEBUG) |
| 546 | { |
| 547 | return "TRIGGER: "+name; |
| 548 | } |
| 549 | else |
| 550 | { |
| 551 | return ""; |
| 552 | } |
| 553 | } |
| 554 | |
| 555 | //////////////////////////////////////////////////////////////////// |
| 556 | // |
| 557 | // PROVIDER INTERFACE |
| 558 | // |
| 559 | //////////////////////////////////////////////////////////////////// |
| 560 | |
| 561 | /** |
| 562 | * @return the stored form of this provider |
| 563 | * |
| 564 | * @see Dependable#getDependableFinder |
| 565 | */ |
| 566 | public DependableFinder getDependableFinder() |
| 567 | { |
| 568 | return getDependableFinder(StoredFormatIds.TRIGGER_DESCRIPTOR_FINDER_V01_ID); |
| 569 | } |
| 570 | |
| 571 | /** |
| 572 | * Return the name of this Provider. (Useful for errors.) |
| 573 | * |
| 574 | * @return String The name of this provider. |
| 575 | */ |
| 576 | public String getObjectName() |
| 577 | { |
| 578 | return name; |
| 579 | } |
| 580 | |
| 581 | /** |
| 582 | * Get the provider's UUID |
| 583 | * |
| 584 | * @return The provider's UUID |
| 585 | */ |
| 586 | public UUID getObjectID() |
| 587 | { |
| 588 | return id; |
| 589 | } |
| 590 | |
| 591 | /** |
| 592 | * Get the provider's type. |
| 593 | * |
| 594 | * @return char The provider's type. |
| 595 | */ |
| 596 | public String getClassType() |
| 597 | { |
| 598 | return Dependable.TRIGGER; |
| 599 | } |
| 600 | |
| 601 | ////////////////////////////////////////////////////// |
| 602 | // |
| 603 | // DEPENDENT INTERFACE |
| 604 | // |
| 605 | // Triggers are dependent on the underlying table, |
| 606 | // and their spses (for the trigger action and the WHEN |
| 607 | // clause). |
| 608 | // |
| 609 | ////////////////////////////////////////////////////// |
| 610 | /** |
| 611 | * Check that all of the dependent's dependencies are valid. |
| 612 | * |
| 613 | * @return true if the dependent is currently valid |
| 614 | */ |
| 615 | public synchronized boolean isValid() |
| 616 | { |
| 617 | return true; |
| 618 | } |
| 619 | |
| 620 | /** |
| 621 | * Prepare to mark the dependent as invalid (due to at least one of |
| 622 | * its dependencies being invalid). |
| 623 | * |
| 624 | * @param action The action causing the invalidation |
| 625 | * @param p the provider |
| 626 | * @param lcc the language connection context |
| 627 | * |
| 628 | * @exception StandardException thrown if unable to make it invalid |
| 629 | */ |
| 630 | public void prepareToInvalidate |
| 631 | ( |
| 632 | Provider p, |
| 633 | int action, |
| 634 | LanguageConnectionContext lcc |
| 635 | ) throws StandardException |
| 636 | { |
| 637 | |
| 638 | |
| 639 | switch (action) |
| 640 | { |
| 641 | /* |
| 642 | ** We are only dependent on the underlying |
| 643 | ** table, and our spses. (we should be |
| 644 | ** dropped before our table is dropped). |
| 645 | */ |
| 646 | case DependencyManager.DROP_TABLE: |
| 647 | case DependencyManager.DROP_SYNONYM: |
| 648 | case DependencyManager.DROP_SPS: |
| 649 | case DependencyManager.RENAME: |
| 650 | DependencyManager dm = getDataDictionary().getDependencyManager(); |
| 651 | throw StandardException.newException(SQLState.LANG_PROVIDER_HAS_DEPENDENT_OBJECT, |
| 652 | dm.getActionString(action), |
| 653 | p.getObjectName(), "TRIGGER", name); |
| 654 | |
| 655 | /* |
| 656 | ** The trigger descriptor depends on the trigger table. |
| 657 | ** This means that we get called whenever anything happens |
| 658 | ** to the trigger table. There are so many cases where this |
| 659 | ** can happen that it doesn't make sense to have an assertion |
| 660 | ** here to check whether the action was expected (it makes |
| 661 | ** the code hard to maintain, and creates a big switch statement). |
| 662 | */ |
| 663 | default: |
| 664 | break; |
| 665 | } |
| 666 | } |
| 667 | |
| 668 | /** |
| 669 | * Mark the dependent as invalid (due to at least one of |
| 670 | * its dependencies being invalid). Always an error |
| 671 | * for a trigger -- should never have gotten here. |
| 672 | * |
| 673 | * @param lcc the language connection context |
| 674 | * @param action The action causing the invalidation |
| 675 | * |
| 676 | * @exception StandardException thrown if called in sanity mode |
| 677 | */ |
| 678 | public void makeInvalid(int action, LanguageConnectionContext lcc) throws StandardException |
| 679 | { |
| 680 | // No sanity check for valid action. Trigger descriptors depend on |
| 681 | // the trigger table, so there is a very large number of actions |
| 682 | // that we would have to check against. This is hard to maintain, |
| 683 | // so don't bother. |
| 684 | } |
| 685 | |
| 686 | /** |
| 687 | * Attempt to revalidate the dependent. Meaningless |
| 688 | * for a trigger. |
| 689 | * |
| 690 | * @param lcc the language connection context |
| 691 | */ |
| 692 | public void makeValid(LanguageConnectionContext lcc) |
| 693 | { |
| 694 | } |
| 695 | |
| 696 | |
| 697 | ////////////////////////////////////////////////////////////// |
| 698 | // |
| 699 | // FORMATABLE |
| 700 | // |
| 701 | ////////////////////////////////////////////////////////////// |
| 702 | |
| 703 | /** |
| 704 | * Read this object from a stream of stored objects. |
| 705 | * |
| 706 | * @param in read this. |
| 707 | * |
| 708 | * @exception IOException thrown on error |
| 709 | * @exception ClassNotFoundException thrown on error |
| 710 | */ |
| 711 | public void readExternal(ObjectInput in) |
| 712 | throws IOException, ClassNotFoundException |
| 713 | { |
| 714 | id = (UUID)in.readObject(); |
| 715 | name = (String)in.readObject(); |
| 716 | triggerSchemaId = (UUID)in.readObject(); |
| 717 | triggerTableId = (UUID)in.readObject(); |
| 718 | eventMask = in.readInt(); |
| 719 | isBefore = in.readBoolean(); |
| 720 | isRow = in.readBoolean(); |
| 721 | isEnabled = in.readBoolean(); |
| 722 | whenSPSId = (UUID)in.readObject(); |
| 723 | actionSPSId = (UUID)in.readObject(); |
| 724 | int length = in.readInt(); |
| 725 | if (length != 0) |
| 726 | { |
| 727 | referencedCols = new int[length]; |
| 728 | for (int i = 0; i < length; i++) |
| 729 | { |
| 730 | referencedCols[i] = in.readInt(); |
| 731 | } |
| 732 | } |
| 733 | triggerDefinition = (String)in.readObject(); |
| 734 | referencingOld = in.readBoolean(); |
| 735 | referencingNew = in.readBoolean(); |
| 736 | oldReferencingName = (String)in.readObject(); |
| 737 | newReferencingName = (String)in.readObject(); |
| 738 | |
| 739 | } |
| 740 | |
| 741 | protected DataDictionary getDataDictionary() throws StandardException |
| 742 | { |
| 743 | /* |
| 744 | note: we need to do this since when this trigger is read back from |
| 745 | disk (when it is associated with a sps), the dataDictionary has not |
| 746 | been initialized and therefore can give a NullPointerException |
| 747 | */ |
| 748 | DataDictionary dd = super.getDataDictionary(); |
| 749 | if (dd == null) |
| 750 | { |
| 751 | LanguageConnectionContext lcc = (LanguageConnectionContext) |
| 752 | ContextService.getContext(LanguageConnectionContext.CONTEXT_ID); |
| 753 | dd = lcc.getDataDictionary(); |
| 754 | setDataDictionary(dd); |
| 755 | } |
| 756 | return dd; |
| 757 | } |
| 758 | |
| 759 | /** |
| 760 | * Write this object to a stream of stored objects. |
| 761 | * |
| 762 | * @param out write bytes here. |
| 763 | * |
| 764 | * @exception IOException thrown on error |
| 765 | */ |
| 766 | public void writeExternal( ObjectOutput out ) |
| 767 | throws IOException |
| 768 | { |
| 769 | if (SanityManager.DEBUG) |
| 770 | { |
| 771 | SanityManager.ASSERT(triggerSchemaId != null, |
| 772 | "triggerSchemaId expected to be non-null"); |
| 773 | SanityManager.ASSERT(triggerTableId != null, |
| 774 | "triggerTableId expected to be non-null"); |
| 775 | } |
| 776 | out.writeObject(id); |
| 777 | out.writeObject(name); |
| 778 | out.writeObject(triggerSchemaId); |
| 779 | out.writeObject(triggerTableId); |
| 780 | out.writeInt(eventMask); |
| 781 | out.writeBoolean(isBefore); |
| 782 | out.writeBoolean(isRow); |
| 783 | out.writeBoolean(isEnabled); |
| 784 | out.writeObject(whenSPSId); |
| 785 | out.writeObject(actionSPSId); |
| 786 | if (referencedCols == null) |
| 787 | { |
| 788 | out.writeInt(0); |
| 789 | } |
| 790 | else |
| 791 | { |
| 792 | out.writeInt(referencedCols.length); |
| 793 | for (int i = 0; i < referencedCols.length; i++) |
| 794 | { |
| 795 | out.writeInt(referencedCols[i]); |
| 796 | } |
| 797 | } |
| 798 | out.writeObject(triggerDefinition); |
| 799 | out.writeBoolean(referencingOld); |
| 800 | out.writeBoolean(referencingNew); |
| 801 | out.writeObject(oldReferencingName); |
| 802 | out.writeObject(newReferencingName); |
| 803 | } |
| 804 | |
| 805 | /** |
| 806 | * Get the formatID which corresponds to this class. |
| 807 | * |
| 808 | * @return the formatID of this class |
| 809 | */ |
| 810 | public int getTypeFormatId() { return StoredFormatIds.TRIGGER_DESCRIPTOR_V01_ID; } |
| 811 | |
| 812 | /** @see TupleDescriptor#getDescriptorType */ |
| 813 | public String getDescriptorType() |
| 814 | { |
| 815 | return "Trigger"; |
| 816 | } |
| 817 | |
| 818 | /** @see TupleDescriptor#getDescriptorName */ |
| 819 | public String getDescriptorName() { return name; } |
| 820 | |
| 821 | } |
| 822 | |