sonu gupta | 1bb37b8 | 2016-11-11 16:51:18 +0530 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2016-present Open Networking Laboratory |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package org.onosproject.yms.app.ydt; |
| 18 | |
| 19 | import org.onosproject.yangutils.datamodel.YangList; |
| 20 | import org.onosproject.yangutils.datamodel.YangSchemaNode; |
| 21 | import org.onosproject.yangutils.datamodel.YangSchemaNodeContextInfo; |
| 22 | import org.onosproject.yangutils.datamodel.YangSchemaNodeIdentifier; |
| 23 | import org.onosproject.yangutils.datamodel.exceptions.DataModelException; |
| 24 | import org.onosproject.yms.app.ydt.exceptions.YdtException; |
| 25 | import org.onosproject.yms.ydt.YdtContext; |
| 26 | import org.onosproject.yms.ydt.YdtContextOperationType; |
| 27 | import org.onosproject.yms.ydt.YdtExtendedInfoType; |
| 28 | import org.onosproject.yms.ydt.YdtType; |
| 29 | |
| 30 | import java.util.ArrayList; |
| 31 | import java.util.HashMap; |
| 32 | import java.util.HashSet; |
| 33 | import java.util.List; |
| 34 | import java.util.Map; |
| 35 | import java.util.Set; |
| 36 | |
| 37 | import static org.onosproject.yms.app.ydt.YdtConstants.errorMsg; |
| 38 | |
| 39 | /** |
| 40 | * Represents implementation of interfaces to build and obtain YANG data tree |
| 41 | * which is data (sub)instance representation, abstract of protocol. |
| 42 | */ |
| 43 | public abstract class YdtNode<T> implements YdtExtendedContext, Cloneable { |
| 44 | |
| 45 | // ydt formatted error string |
| 46 | private static final String FMT_UNI_KEY = |
| 47 | "Some of the key elements are not unique in %s."; |
| 48 | private static final String FMT_KLIST_STR = |
| 49 | "List of key cannot be created for leaf and leaf-list %s node."; |
| 50 | private static final String FMT_VAL_N = |
| 51 | "Value cannot be set in non leaf %s node."; |
| 52 | private static final String FMT_VAL_NS = |
| 53 | "ValueSet cannot be set in non leaf-list %s node."; |
| 54 | private static final String FMT_VAL_IN = |
| 55 | "Value cannot be invoke from non leaf %s node."; |
| 56 | private static final String FMT_VAL_INS = |
| 57 | "ValueSet cannot be invoke from non leaf-list %s node"; |
| 58 | private static final String FMT_MANY_INS = |
| 59 | "Too many instances of %s. Expected maximum instances %d."; |
| 60 | private static final String FMT_FEW_INS = |
| 61 | "Too few instances of %s. Expected minimum instances %d."; |
| 62 | |
| 63 | // ydt error string |
| 64 | private static final String E_EXIST = "Node is already part of a tree"; |
| 65 | private static final String E_ATOMIC = |
| 66 | "Child to be added is not atomic, it already has a child"; |
| 67 | private static final String E_SIB = |
| 68 | "Child to be added is not atomic, it already has a next sibling"; |
| 69 | private static final String E_PRE = |
| 70 | "Child to be added is not atomic, it already has a previous " + |
| 71 | "sibling"; |
| 72 | private static final String E_SUPPORT = "Requested node type not supported"; |
| 73 | |
| 74 | /* |
| 75 | * Parent reference. |
| 76 | */ |
| 77 | private YdtNode parent; |
| 78 | |
| 79 | /* |
| 80 | * First child reference. |
| 81 | */ |
| 82 | private YdtNode child; |
| 83 | |
| 84 | /* |
| 85 | * Next sibling reference. |
| 86 | */ |
| 87 | private YdtNode nextSibling; |
| 88 | |
| 89 | /* |
| 90 | * Previous sibling reference. |
| 91 | */ |
| 92 | private YdtNode previousSibling; |
| 93 | |
| 94 | /* |
| 95 | * Last child reference. |
| 96 | */ |
| 97 | private YdtNode lastChild; |
| 98 | |
| 99 | /* |
| 100 | * Type of node. |
| 101 | */ |
| 102 | private YdtType ydtType; |
| 103 | |
| 104 | /* |
| 105 | * Flag to keep the track of context switch, |
| 106 | * if set then traverse back to parent in YDT app tree else no need. |
| 107 | */ |
| 108 | private boolean isContextSwitch; |
| 109 | |
| 110 | /* |
| 111 | * YDT extended information. |
| 112 | */ |
| 113 | private T ydtExtendedInfo; |
| 114 | |
| 115 | /* |
| 116 | * YDT extended information type. |
| 117 | */ |
| 118 | private YdtExtendedInfoType ydtExtendedInfoType; |
| 119 | |
| 120 | /* |
| 121 | * Ydt map to keep the track of node added in YDT. |
| 122 | */ |
| 123 | final Map<YangSchemaNodeIdentifier, List<YdtNode<T>>> ydtNodeMap = |
| 124 | new HashMap<>(); |
| 125 | |
| 126 | /* |
| 127 | * Reference for data-model schema node. |
| 128 | */ |
| 129 | private YangSchemaNode yangSchemaNode; |
| 130 | |
| 131 | /* |
| 132 | * Reference for ydt node operation type. |
| 133 | */ |
| 134 | private YdtContextOperationType ydtContextOperationType; |
| 135 | |
| 136 | /* |
| 137 | * Key object for ydtNodeMap. |
| 138 | */ |
| 139 | private YangSchemaNodeIdentifier id; |
| 140 | |
| 141 | /* |
| 142 | * Ydt map to keep the track of application information object |
| 143 | * with respective type. |
| 144 | */ |
| 145 | private final Map<AppType, Object> ydtAppInfoMap = new HashMap<>(); |
| 146 | |
| 147 | private YdtContext clonedNode; |
| 148 | |
| 149 | /** |
| 150 | * Returns the cloned ydt node. |
| 151 | * |
| 152 | * @return clonedNode cloned ydt node |
| 153 | */ |
| 154 | public YdtContext getClonedNode() { |
| 155 | return clonedNode; |
| 156 | } |
| 157 | |
| 158 | /** |
| 159 | * Sets the cloned node. |
| 160 | * |
| 161 | * @param clonedNode cloned ydt node |
| 162 | */ |
| 163 | public void setClonedNode(YdtContext clonedNode) { |
| 164 | this.clonedNode = clonedNode; |
| 165 | } |
| 166 | |
| 167 | @Override |
| 168 | public String getName() { |
| 169 | return id.getName(); |
| 170 | } |
| 171 | |
| 172 | @Override |
| 173 | public String getNamespace() { |
| 174 | return id.getNameSpace(); |
| 175 | } |
| 176 | |
| 177 | @Override |
| 178 | public <T> T getYdtContextExtendedInfo() { |
| 179 | return (T) ydtExtendedInfo; |
| 180 | } |
| 181 | |
| 182 | @Override |
| 183 | public YdtExtendedInfoType getYdtExtendedInfoType() { |
| 184 | return ydtExtendedInfoType; |
| 185 | } |
| 186 | |
| 187 | @Override |
| 188 | public YdtType getYdtType() { |
| 189 | return ydtType; |
| 190 | } |
| 191 | |
| 192 | @Override |
| 193 | public YdtNode getParent() { |
| 194 | return parent; |
| 195 | } |
| 196 | |
| 197 | @Override |
| 198 | public YdtNode getFirstChild() { |
| 199 | return child; |
| 200 | } |
| 201 | |
| 202 | @Override |
| 203 | public YdtNode getNextSibling() { |
| 204 | return nextSibling; |
| 205 | } |
| 206 | |
| 207 | public YangSchemaNode getYangSchemaNode() { |
| 208 | return yangSchemaNode; |
| 209 | } |
| 210 | |
| 211 | @Override |
| 212 | public YdtNode getLastChild() { |
| 213 | return lastChild; |
| 214 | } |
| 215 | |
| 216 | @Override |
| 217 | public Object getAppInfo(AppType appType) { |
| 218 | return ydtAppInfoMap.get(appType); |
| 219 | } |
| 220 | |
| 221 | @Override |
| 222 | public void addAppInfo(AppType appType, Object object) { |
| 223 | ydtAppInfoMap.put(appType, object); |
| 224 | } |
| 225 | |
| 226 | @Override |
| 227 | public YangSchemaNodeContextInfo getSchemaNodeContextInfo( |
| 228 | YangSchemaNodeIdentifier id) { |
| 229 | try { |
| 230 | return getYangSchemaNode().getChildSchema(id); |
| 231 | } catch (DataModelException e) { |
| 232 | errorHandler(e.getLocalizedMessage(), this); |
| 233 | } |
| 234 | return null; |
| 235 | } |
| 236 | |
| 237 | /** |
| 238 | * Adds the given value to the non single instance leaf node. |
| 239 | * <p> |
| 240 | * This default implementation throws an exception stating that |
| 241 | * the value cannot be added. Subclasses may override this method |
| 242 | * to provide the correct behavior for their specific implementation. |
| 243 | * |
| 244 | * @param value value in a single instance node |
| 245 | */ |
| 246 | public void addValue(String value) { |
| 247 | errorHandler( |
| 248 | errorMsg(FMT_VAL_N, getYdtNodeIdentifier().getName()), this); |
| 249 | } |
| 250 | |
| 251 | /** |
| 252 | * Creates the list of key element's of multi instance node. |
| 253 | * this will not be applicable on leaf and leaf-list node. |
| 254 | */ |
| 255 | public void createKeyNodeList() { |
| 256 | errorHandler(errorMsg( |
| 257 | FMT_KLIST_STR, getYdtNodeIdentifier().getName()), this); |
| 258 | } |
| 259 | |
| 260 | /** |
| 261 | * Adds the given value to the non single instance leaf node. |
| 262 | * <p> |
| 263 | * This default implementation throws an exception stating that |
| 264 | * the value cannot be added. Subclasses may override this method |
| 265 | * to provide the correct behavior for their specific implementation. |
| 266 | * This will be applicable in case of call from SBI so no need |
| 267 | * to validate the value. |
| 268 | * |
| 269 | * @param value value in a single instance leaf node |
| 270 | */ |
| 271 | public void addValueWithoutValidation(String value) { |
| 272 | errorHandler( |
| 273 | errorMsg(FMT_VAL_N, getYdtNodeIdentifier().getName()), this); |
| 274 | } |
| 275 | |
| 276 | /** |
| 277 | * Adds the given valueSet to the non multi instance leaf node. |
| 278 | * <p> |
| 279 | * This default implementation throws an exception stating that |
| 280 | * the value cannot be added. Subclasses may override this method |
| 281 | * to provide the correct behavior for their specific implementation. |
| 282 | * |
| 283 | * @param valueSet valueSet in a multi instance leaf node |
| 284 | */ |
| 285 | public void addValueSet(Set<String> valueSet) { |
| 286 | errorHandler( |
| 287 | errorMsg(FMT_VAL_NS, getYdtNodeIdentifier().getName()), this); |
| 288 | } |
| 289 | |
| 290 | /** |
| 291 | * Adds the given valueSet to the non multi instance leaf node. |
| 292 | * <p> |
| 293 | * This default implementation throws an exception stating that |
| 294 | * the value cannot be added. Subclasses may override this method |
| 295 | * to provide the correct behavior for their specific implementation. |
| 296 | * This will be applicable in case of call from SBI so no need |
| 297 | * to validate the value. |
| 298 | * |
| 299 | * @param valueSet valueSet in a multi instance leaf node |
| 300 | */ |
| 301 | public void addValueSetWithoutValidation(Set<String> valueSet) { |
| 302 | errorHandler( |
| 303 | errorMsg(FMT_VAL_NS, getYdtNodeIdentifier().getName()), this); |
| 304 | } |
| 305 | |
| 306 | /** |
| 307 | * Validates requested node allowed to have duplicate entry or not. |
| 308 | * <p> |
| 309 | * This default implementation throws an exception stating that |
| 310 | * the duplicate entry found. Subclasses may override this method |
| 311 | * to provide the correct behavior for their specific implementation. |
| 312 | */ |
| 313 | public void validDuplicateEntryProcessing() { |
| 314 | } |
| 315 | |
| 316 | /** |
| 317 | * Returns already existing YdtNode in Ydt tree with same nodeIdentifier. |
| 318 | * |
| 319 | * @param id represents a identifier of YANG data tree node |
| 320 | * @return YDT node |
| 321 | */ |
| 322 | public YdtNode getCollidingChild(YangSchemaNodeIdentifier id) { |
| 323 | |
| 324 | // Find the key in YDT map for getting the colliding node. |
| 325 | List<YdtNode<T>> collidingChild = ydtNodeMap.get(id); |
| 326 | |
| 327 | /* |
| 328 | * If colliding child exist then process colliding node in respective |
| 329 | * YDT node type. |
| 330 | */ |
| 331 | if (collidingChild != null) { |
| 332 | collidingChild.get(0).validDuplicateEntryProcessing(); |
| 333 | return collidingChild.get(0); |
| 334 | } |
| 335 | |
| 336 | return null; |
| 337 | } |
| 338 | |
| 339 | /** |
| 340 | * Creates a specific type of node. |
| 341 | * |
| 342 | * @param type of YDT node |
| 343 | * @param id node identifier of the YDT node |
| 344 | */ |
| 345 | YdtNode(YdtType type, YangSchemaNodeIdentifier id) { |
| 346 | ydtType = type; |
| 347 | setId(id); |
| 348 | } |
| 349 | |
| 350 | /** |
| 351 | * Sets the parent of node. |
| 352 | * |
| 353 | * @param parent node |
| 354 | */ |
| 355 | public void setParent(YdtNode parent) { |
| 356 | this.parent = parent; |
| 357 | } |
| 358 | |
| 359 | /** |
| 360 | * Sets the first instance of a child node. |
| 361 | * |
| 362 | * @param child is only child to be set |
| 363 | */ |
| 364 | public void setChild(YdtNode child) { |
| 365 | this.child = child; |
| 366 | } |
| 367 | |
| 368 | /** |
| 369 | * Sets the next sibling of node. |
| 370 | * |
| 371 | * @param sibling YANG node |
| 372 | */ |
| 373 | public void setNextSibling(YdtNode sibling) { |
| 374 | nextSibling = sibling; |
| 375 | } |
| 376 | |
| 377 | /** |
| 378 | * Returns the previous sibling of a node. |
| 379 | * |
| 380 | * @return previous sibling of a node |
| 381 | */ |
| 382 | public YdtNode getPreviousSibling() { |
| 383 | return previousSibling; |
| 384 | } |
| 385 | |
| 386 | /** |
| 387 | * Sets the previous sibling. |
| 388 | * |
| 389 | * @param previousSibling points to predecessor sibling |
| 390 | */ |
| 391 | public void setPreviousSibling(YdtNode previousSibling) { |
| 392 | this.previousSibling = previousSibling; |
| 393 | } |
| 394 | |
| 395 | @Override |
| 396 | public String getValue() { |
| 397 | errorHandler( |
| 398 | errorMsg(FMT_VAL_IN, getYdtNodeIdentifier().getName()), this); |
| 399 | return null; |
| 400 | } |
| 401 | |
| 402 | @Override |
| 403 | public Set<String> getValueSet() { |
| 404 | errorHandler( |
| 405 | errorMsg(FMT_VAL_INS, getYdtNodeIdentifier().getName()), this); |
| 406 | return null; |
| 407 | } |
| 408 | |
| 409 | /** |
| 410 | * Sets the data-model node reference for of a given node. |
| 411 | * |
| 412 | * @param yangSchemaNode YANG data node |
| 413 | */ |
| 414 | public void setYangSchemaNode(YangSchemaNode yangSchemaNode) { |
| 415 | this.yangSchemaNode = yangSchemaNode; |
| 416 | } |
| 417 | |
| 418 | /** |
| 419 | * Sets the last instance of a child node. |
| 420 | * |
| 421 | * @param child is last child to be set |
| 422 | */ |
| 423 | public void setLastChild(YdtNode child) { |
| 424 | lastChild = child; |
| 425 | } |
| 426 | |
| 427 | /** |
| 428 | * Returns object node identifier. |
| 429 | * |
| 430 | * @return node identifier |
| 431 | */ |
| 432 | public YangSchemaNodeIdentifier getYdtNodeIdentifier() { |
| 433 | return id; |
| 434 | } |
| 435 | |
| 436 | /** |
| 437 | * Sets object node identifier. |
| 438 | * |
| 439 | * @param id node identifier |
| 440 | */ |
| 441 | public void setId(YangSchemaNodeIdentifier id) { |
| 442 | this.id = id; |
| 443 | } |
| 444 | |
| 445 | /** |
| 446 | * Adds a child node. |
| 447 | * The children sibling list will be sorted based on node |
| 448 | * type. This will add single child or sub-tree based on isAtomic flag. |
| 449 | * |
| 450 | * @param newChild refers to a new child to be added |
| 451 | * @param isAtomic boolean flag to maintain atomicity of the current node |
| 452 | * @throws YdtException in case of violation of any YDT rule |
| 453 | */ |
| 454 | public void addChild(YdtContext newChild, boolean isAtomic) |
| 455 | throws YdtException { |
| 456 | |
| 457 | if (!(newChild instanceof YdtNode)) { |
| 458 | errorHandler(errorMsg(E_SUPPORT), this); |
| 459 | } |
| 460 | |
| 461 | YdtNode node = (YdtNode) newChild; |
| 462 | |
| 463 | if (node.getParent() == null) { |
| 464 | node.setParent(this); |
| 465 | } else if (!node.getParent().equals(this)) { |
| 466 | errorHandler(errorMsg(E_EXIST), this); |
| 467 | } |
| 468 | |
| 469 | if (node.getFirstChild() != null && isAtomic) { |
| 470 | errorHandler(errorMsg(E_ATOMIC), this); |
| 471 | } |
| 472 | |
| 473 | if (node.getNextSibling() != null) { |
| 474 | errorHandler(errorMsg(E_SIB), this); |
| 475 | } |
| 476 | |
| 477 | if (node.getPreviousSibling() != null) { |
| 478 | errorHandler(errorMsg(E_PRE), this); |
| 479 | } |
| 480 | |
| 481 | // If new node needs to be added as first child. |
| 482 | if (getFirstChild() == null) { |
| 483 | setChild(node); |
| 484 | setLastChild(node); |
| 485 | return; |
| 486 | } |
| 487 | |
| 488 | // If new node needs to be added as last child. |
| 489 | YdtNode curNode = getLastChild(); |
| 490 | curNode.setNextSibling(node); |
| 491 | node.setPreviousSibling(curNode); |
| 492 | setLastChild(node); |
| 493 | } |
| 494 | |
| 495 | @Override |
| 496 | public YdtContextOperationType getYdtContextOperationType() { |
| 497 | return ydtContextOperationType; |
| 498 | } |
| 499 | |
| 500 | /** |
| 501 | * Sets type of yang data tree node operation. |
| 502 | * |
| 503 | * @param opType type of yang data tree node operation |
| 504 | */ |
| 505 | public void setYdtContextOperationType(YdtContextOperationType opType) { |
| 506 | ydtContextOperationType = opType; |
| 507 | } |
| 508 | |
| 509 | /** |
| 510 | * Updates ydt map of current context parent node. |
| 511 | * |
| 512 | * @param id object node identifier |
| 513 | * @param node ydt node for which map need to be updated |
| 514 | */ |
| 515 | public void updateYdtMap(YangSchemaNodeIdentifier id, YdtNode node) { |
| 516 | List<YdtNode<T>> list = ydtNodeMap.get(id); |
| 517 | if (list == null) { |
| 518 | list = new ArrayList<>(); |
| 519 | ydtNodeMap.put(id, list); |
| 520 | } |
| 521 | list.add(node); |
| 522 | } |
| 523 | |
| 524 | /** |
| 525 | * Returns the flag for node if context switch. |
| 526 | * |
| 527 | * @return isContextSwitch flag of a node |
| 528 | */ |
| 529 | public boolean getAppContextSwitch() { |
| 530 | return isContextSwitch; |
| 531 | } |
| 532 | |
| 533 | /** |
| 534 | * Sets the flag to keep the track of context switch. |
| 535 | * If it is set then when YDT get traverToParent then |
| 536 | * traverse back to parent in YDT application tree. |
| 537 | */ |
| 538 | public void setAppContextSwitch() { |
| 539 | isContextSwitch = true; |
| 540 | } |
| 541 | |
| 542 | /** |
| 543 | * Validates all multi Instance inside current context. |
| 544 | */ |
| 545 | public void validateMultiInstanceNode() { |
| 546 | |
| 547 | // Set for checking whether input string is unique or not. |
| 548 | Set<String> keyStringSet = new HashSet<>(); |
| 549 | |
| 550 | // Iterating over values in map and find multi instance node list only. |
| 551 | for (List<YdtNode<T>> ydtNodeList : ydtNodeMap.values()) { |
| 552 | validateInstances(keyStringSet, ydtNodeList); |
| 553 | } |
| 554 | } |
| 555 | |
| 556 | /** |
| 557 | * Checks for any duplicate list entries. |
| 558 | * |
| 559 | * @param keyStringSet set to validate the composite key of an instance |
| 560 | * @param ydtNodeList list of entries |
| 561 | */ |
| 562 | private void validateInstances(Set<String> keyStringSet, |
| 563 | List<YdtNode<T>> ydtNodeList) { |
| 564 | // Clearing the set. |
| 565 | keyStringSet.clear(); |
| 566 | |
| 567 | if (ydtNodeList.get(0) instanceof YdtMultiInstanceNode) { |
| 568 | |
| 569 | // Storing the number of multiInstance node for number |
| 570 | // if instance validation. |
| 571 | int instanceCount = ydtNodeList.size(); |
| 572 | |
| 573 | YangList list = (YangList) ydtNodeList.get(0).getYangSchemaNode(); |
| 574 | int minElement; |
| 575 | int maxElement; |
| 576 | if (list.getMinElements() != null) { |
| 577 | minElement = list.getMinElements().getMinElement(); |
| 578 | if (instanceCount < minElement) { |
| 579 | errorHandler(errorMsg(FMT_FEW_INS, list.getName(), |
| 580 | minElement), this); |
| 581 | } |
| 582 | } |
| 583 | |
| 584 | if (list.getMaxElements() != null) { |
| 585 | maxElement = list.getMaxElements().getMaxElement(); |
| 586 | if (instanceCount > maxElement) { |
| 587 | errorHandler(errorMsg(FMT_MANY_INS, list.getName(), |
| 588 | maxElement), this); |
| 589 | } |
| 590 | } |
| 591 | |
| 592 | if (list.isConfig() && instanceCount > 1) { |
| 593 | // Iterating over values in ydtNodeList of |
| 594 | // multiInstanceNode and compare the key string. |
| 595 | for (YdtNode ydtNode : ydtNodeList) { |
| 596 | if (!keyStringSet.add(((YdtMultiInstanceNode) ydtNode) |
| 597 | .getCompositeKey())) { |
| 598 | errorHandler(errorMsg( |
| 599 | FMT_UNI_KEY, ydtNode.getYdtNodeIdentifier() |
| 600 | .getName()), this); |
| 601 | } |
| 602 | } |
| 603 | } |
| 604 | } |
| 605 | } |
| 606 | |
| 607 | /** |
| 608 | * Walks in whole Ydt Tree and de-reference all the tree node. |
| 609 | * This will be called only when any exception occurs while processing |
| 610 | * the node in Ydt tree. |
| 611 | * |
| 612 | * @param node ydt node |
| 613 | */ |
| 614 | public void freeRestResources(YdtNode node) { |
| 615 | // Traversing to logical rootNode. |
| 616 | YdtNode rootNode = node; |
| 617 | while (rootNode.getParent() != null) { |
| 618 | rootNode = rootNode.getParent(); |
| 619 | } |
| 620 | YdtNode currentNode = rootNode; |
| 621 | while (currentNode != null) { |
| 622 | |
| 623 | // Move down to first child |
| 624 | YdtNode nextNode = currentNode.getFirstChild(); |
| 625 | if (nextNode != null) { |
| 626 | currentNode = nextNode; |
| 627 | continue; |
| 628 | } |
| 629 | |
| 630 | // No child nodes, so walk tree |
| 631 | while (currentNode != null) { |
| 632 | // To keep the track of last sibling. |
| 633 | YdtNode lastSibling = currentNode; |
| 634 | |
| 635 | // Move to sibling if possible. |
| 636 | nextNode = currentNode.getNextSibling(); |
| 637 | |
| 638 | // free currentNode resources |
| 639 | free(lastSibling); |
| 640 | |
| 641 | lastSibling.getNamespace(); |
| 642 | if (nextNode != null) { |
| 643 | currentNode = nextNode; |
| 644 | break; |
| 645 | } |
| 646 | |
| 647 | // Move up |
| 648 | if (currentNode.equals(rootNode)) { |
| 649 | currentNode = null; |
| 650 | } else { |
| 651 | currentNode = currentNode.getParent(); |
| 652 | lastSibling.setParent(null); |
| 653 | } |
| 654 | } |
| 655 | } |
| 656 | } |
| 657 | |
| 658 | /** |
| 659 | * Free the give YDT node by de-referencing it to null. |
| 660 | * |
| 661 | * @param node node to be freed |
| 662 | */ |
| 663 | private void free(YdtNode node) { |
| 664 | if (node.getParent() != null) { |
| 665 | YdtNode parent = node.getParent(); |
| 666 | parent.setChild(null); |
| 667 | parent.setLastChild(null); |
| 668 | if (node.getNextSibling() != null) { |
| 669 | parent.setChild(node.getNextSibling()); |
| 670 | } |
| 671 | } |
| 672 | YdtNode parentRef = node.getParent(); |
| 673 | node = new YdtSingleInstanceNode(null); |
| 674 | node.ydtType = null; |
| 675 | node.setParent(parentRef); |
| 676 | } |
| 677 | |
| 678 | /** |
| 679 | * Clones the current node contents and create a new node. |
| 680 | * |
| 681 | * @return cloned node |
| 682 | * @throws CloneNotSupportedException clone is not supported |
| 683 | * by the referred node |
| 684 | */ |
| 685 | public YdtNode clone() throws CloneNotSupportedException { |
| 686 | YdtNode clonedNode = (YdtNode) super.clone(); |
| 687 | clonedNode.setPreviousSibling(null); |
| 688 | clonedNode.setNextSibling(null); |
| 689 | clonedNode.setParent(null); |
| 690 | clonedNode.setChild(null); |
| 691 | clonedNode.setLastChild(null); |
| 692 | return clonedNode; |
| 693 | } |
| 694 | |
| 695 | /** |
| 696 | * Handles an error scenario, freeing allocated resources for the given YTD |
| 697 | * node before throwing an exception with the specified error message. |
| 698 | * |
| 699 | * @param error error message |
| 700 | * @param curNode ydt node |
| 701 | * @throws YdtException with the specified error message |
| 702 | */ |
| 703 | public void errorHandler(String error, YdtNode curNode) { |
| 704 | curNode.freeRestResources(curNode); |
| 705 | throw new YdtException(error); |
| 706 | } |
| 707 | } |