cps-ri/src/main/java/org/onap/cps/spi/impl/CpsDataPersistenceServiceImpl.java

   1 /*
   2  *  ============LICENSE_START=======================================================
   3  *  Copyright (C) 2021-2022 Nordix Foundation
   4  *  Modifications Copyright (C) 2021 Pantheon.tech
   5  *  Modifications Copyright (C) 2020-2022 Bell Canada.
   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  *  SPDX-License-Identifier: Apache-2.0
  20  *  ============LICENSE_END=========================================================
  21  */
  22
  23 package org.onap.cps.spi.impl;
  24
  25 import com.google.common.collect.ImmutableSet;
  26 import com.google.common.collect.ImmutableSet.Builder;
  27 import java.util.ArrayList;
  28 import java.util.Collection;
  29 import java.util.Collections;
  30 import java.util.HashMap;
  31 import java.util.HashSet;
  32 import java.util.List;
  33 import java.util.Map;
  34 import java.util.Set;
  35 import java.util.regex.Matcher;
  36 import java.util.regex.Pattern;
  37 import java.util.stream.Collectors;
  38 import javax.transaction.Transactional;
  39 import lombok.RequiredArgsConstructor;
  40 import lombok.extern.slf4j.Slf4j;
  41 import org.hibernate.StaleStateException;
  42 import org.onap.cps.cpspath.parser.CpsPathQuery;
  43 import org.onap.cps.cpspath.parser.CpsPathUtil;
  44 import org.onap.cps.cpspath.parser.PathParsingException;
  45 import org.onap.cps.spi.CpsDataPersistenceService;
  46 import org.onap.cps.spi.FetchDescendantsOption;
  47 import org.onap.cps.spi.entities.AnchorEntity;
  48 import org.onap.cps.spi.entities.DataspaceEntity;
  49 import org.onap.cps.spi.entities.FragmentEntity;
  50 import org.onap.cps.spi.entities.FragmentEntityArranger;
  51 import org.onap.cps.spi.entities.FragmentExtract;
  52 import org.onap.cps.spi.exceptions.AlreadyDefinedException;
  53 import org.onap.cps.spi.exceptions.AlreadyDefinedExceptionBatch;
  54 import org.onap.cps.spi.exceptions.ConcurrencyException;
  55 import org.onap.cps.spi.exceptions.CpsAdminException;
  56 import org.onap.cps.spi.exceptions.CpsPathException;
  57 import org.onap.cps.spi.exceptions.DataNodeNotFoundException;
  58 import org.onap.cps.spi.model.DataNode;
  59 import org.onap.cps.spi.model.DataNodeBuilder;
  60 import org.onap.cps.spi.repository.AnchorRepository;
  61 import org.onap.cps.spi.repository.DataspaceRepository;
  62 import org.onap.cps.spi.repository.FragmentRepository;
  63 import org.onap.cps.spi.utils.SessionManager;
  64 import org.onap.cps.utils.JsonObjectMapper;
  65 import org.springframework.dao.DataIntegrityViolationException;
  66 import org.springframework.stereotype.Service;
  67
  68 @Service
  69 @Slf4j
  70 @RequiredArgsConstructor
  71 public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService {
  72
  73     private final DataspaceRepository dataspaceRepository;
  74     private final AnchorRepository anchorRepository;
  75     private final FragmentRepository fragmentRepository;
  76     private final JsonObjectMapper jsonObjectMapper;
  77     private final SessionManager sessionManager;
  78
  79     private static final String REG_EX_FOR_OPTIONAL_LIST_INDEX = "(\\[@[\\s\\S]+?]){0,1})";
  80     private static final Pattern REG_EX_PATTERN_FOR_LIST_ELEMENT_KEY_PREDICATE =
  81             Pattern.compile("\\[(\\@([^\\/]{0,9999}))\\]$");
  82     private static final String TOP_LEVEL_MODULE_PREFIX_PROPERTY_NAME = "topLevelModulePrefix";
  83
  84     @Override
  85     public void addChildDataNode(final String dataspaceName, final String anchorName, final String parentNodeXpath,
  86                                  final DataNode newChildDataNode) {
  87         addNewChildDataNode(dataspaceName, anchorName, parentNodeXpath, newChildDataNode);
  88     }
  89
  90     @Override
  91     public void addListElements(final String dataspaceName, final String anchorName, final String parentNodeXpath,
  92                                 final Collection<DataNode> newListElements) {
  93         addChildrenDataNodes(dataspaceName, anchorName, parentNodeXpath, newListElements);
  94     }
  95
  96     @Override
  97     public void addMultipleLists(final String dataspaceName, final String anchorName, final String parentNodeXpath,
  98                                  final Collection<Collection<DataNode>> newLists) {
  99         final Collection<String> failedXpaths = new HashSet<>();
 100         newLists.forEach(newList -> {
 101             try {
 102                 addChildrenDataNodes(dataspaceName, anchorName, parentNodeXpath, newList);
 103             } catch (final AlreadyDefinedExceptionBatch e) {
 104                 failedXpaths.addAll(e.getAlreadyDefinedXpaths());
 105             }
 106         });
 107
 108         if (!failedXpaths.isEmpty()) {
 109             throw new AlreadyDefinedExceptionBatch(failedXpaths);
 110         }
 111
 112     }
 113
 114     private void addNewChildDataNode(final String dataspaceName, final String anchorName,
 115                                      final String parentNodeXpath, final DataNode newChild) {
 116         final FragmentEntity parentFragmentEntity =
 117             getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, parentNodeXpath);
 118         final FragmentEntity newChildAsFragmentEntity =
 119                 convertToFragmentWithAllDescendants(parentFragmentEntity.getDataspace(),
 120                         parentFragmentEntity.getAnchor(), newChild);
 121         newChildAsFragmentEntity.setParentId(parentFragmentEntity.getId());
 122         try {
 123             fragmentRepository.save(newChildAsFragmentEntity);
 124         } catch (final DataIntegrityViolationException e) {
 125             throw AlreadyDefinedException.forDataNode(newChild.getXpath(), anchorName, e);
 126         }
 127
 128     }
 129
 130     private void addChildrenDataNodes(final String dataspaceName, final String anchorName, final String parentNodeXpath,
 131                                       final Collection<DataNode> newChildren) {
 132         final FragmentEntity parentFragmentEntity =
 133             getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, parentNodeXpath);
 134         final List<FragmentEntity> fragmentEntities = new ArrayList<>(newChildren.size());
 135         try {
 136             newChildren.forEach(newChildAsDataNode -> {
 137                 final FragmentEntity newChildAsFragmentEntity =
 138                         convertToFragmentWithAllDescendants(parentFragmentEntity.getDataspace(),
 139                                 parentFragmentEntity.getAnchor(), newChildAsDataNode);
 140                 newChildAsFragmentEntity.setParentId(parentFragmentEntity.getId());
 141                 fragmentEntities.add(newChildAsFragmentEntity);
 142             });
 143             fragmentRepository.saveAll(fragmentEntities);
 144         } catch (final DataIntegrityViolationException e) {
 145             log.warn("Exception occurred : {} , While saving : {} children, retrying using individual save operations",
 146                     e, fragmentEntities.size());
 147             retrySavingEachChildIndividually(dataspaceName, anchorName, parentNodeXpath, newChildren);
 148         }
 149     }
 150
 151     private void retrySavingEachChildIndividually(final String dataspaceName, final String anchorName,
 152                                                   final String parentNodeXpath,
 153                                                   final Collection<DataNode> newChildren) {
 154         final Collection<String> failedXpaths = new HashSet<>();
 155         for (final DataNode newChild : newChildren) {
 156             try {
 157                 addNewChildDataNode(dataspaceName, anchorName, parentNodeXpath, newChild);
 158             } catch (final AlreadyDefinedException e) {
 159                 failedXpaths.add(newChild.getXpath());
 160             }
 161         }
 162         if (!failedXpaths.isEmpty()) {
 163             throw new AlreadyDefinedExceptionBatch(failedXpaths);
 164         }
 165     }
 166
 167     @Override
 168     public void storeDataNode(final String dataspaceName, final String anchorName, final DataNode dataNode) {
 169         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 170         final AnchorEntity anchorEntity = anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
 171         final FragmentEntity fragmentEntity = convertToFragmentWithAllDescendants(dataspaceEntity, anchorEntity,
 172                 dataNode);
 173         try {
 174             fragmentRepository.save(fragmentEntity);
 175         } catch (final DataIntegrityViolationException exception) {
 176             throw AlreadyDefinedException.forDataNode(dataNode.getXpath(), anchorName, exception);
 177         }
 178     }
 179
 180     /**
 181      * Convert DataNode object into Fragment and places the result in the fragments placeholder. Performs same action
 182      * for all DataNode children recursively.
 183      *
 184      * @param dataspaceEntity       dataspace
 185      * @param anchorEntity          anchorEntity
 186      * @param dataNodeToBeConverted dataNode
 187      * @return a Fragment built from current DataNode
 188      */
 189     private FragmentEntity convertToFragmentWithAllDescendants(final DataspaceEntity dataspaceEntity,
 190                                                                final AnchorEntity anchorEntity,
 191                                                                final DataNode dataNodeToBeConverted) {
 192         final FragmentEntity parentFragment = toFragmentEntity(dataspaceEntity, anchorEntity, dataNodeToBeConverted);
 193         final Builder<FragmentEntity> childFragmentsImmutableSetBuilder = ImmutableSet.builder();
 194         for (final DataNode childDataNode : dataNodeToBeConverted.getChildDataNodes()) {
 195             final FragmentEntity childFragment =
 196                     convertToFragmentWithAllDescendants(parentFragment.getDataspace(), parentFragment.getAnchor(),
 197                             childDataNode);
 198             childFragmentsImmutableSetBuilder.add(childFragment);
 199         }
 200         parentFragment.setChildFragments(childFragmentsImmutableSetBuilder.build());
 201         return parentFragment;
 202     }
 203
 204     private FragmentEntity toFragmentEntity(final DataspaceEntity dataspaceEntity,
 205                                             final AnchorEntity anchorEntity, final DataNode dataNode) {
 206         return FragmentEntity.builder()
 207                 .dataspace(dataspaceEntity)
 208                 .anchor(anchorEntity)
 209                 .xpath(dataNode.getXpath())
 210                 .attributes(jsonObjectMapper.asJsonString(dataNode.getLeaves()))
 211                 .build();
 212     }
 213
 214     @Override
 215     public DataNode getDataNode(final String dataspaceName, final String anchorName, final String xpath,
 216                                 final FetchDescendantsOption fetchDescendantsOption) {
 217         final FragmentEntity fragmentEntity = getFragmentByXpath(dataspaceName, anchorName, xpath,
 218             fetchDescendantsOption);
 219         return toDataNode(fragmentEntity, fetchDescendantsOption);
 220     }
 221
 222     private FragmentEntity getFragmentWithoutDescendantsByXpath(final String dataspaceName,
 223                                                                 final String anchorName,
 224                                                                 final String xpath) {
 225         return getFragmentByXpath(dataspaceName, anchorName, xpath, FetchDescendantsOption.OMIT_DESCENDANTS);
 226     }
 227
 228     private FragmentEntity getFragmentByXpath(final String dataspaceName, final String anchorName,
 229                                               final String xpath, final FetchDescendantsOption fetchDescendantsOption) {
 230         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 231         final AnchorEntity anchorEntity = anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
 232         if (isRootXpath(xpath)) {
 233             final List<FragmentExtract> fragmentExtracts = fragmentRepository.getTopLevelFragments(dataspaceEntity,
 234                     anchorEntity);
 235             final FragmentEntity fragmentEntity = FragmentEntityArranger.toFragmentEntityTree(anchorEntity,
 236                     fragmentExtracts);
 237             return fragmentEntity;
 238         } else {
 239             final String normalizedXpath = getNormalizedXpath(xpath);
 240             final FragmentEntity fragmentEntity;
 241             if (FetchDescendantsOption.OMIT_DESCENDANTS.equals(fetchDescendantsOption)) {
 242                 fragmentEntity =
 243                     fragmentRepository.getByDataspaceAndAnchorAndXpath(dataspaceEntity, anchorEntity, normalizedXpath);
 244             } else {
 245                 fragmentEntity = buildFragmentEntityFromFragmentExtracts(anchorEntity, normalizedXpath);
 246             }
 247             if (fragmentEntity == null) {
 248                 throw new DataNodeNotFoundException(dataspaceEntity.getName(), anchorEntity.getName(), xpath);
 249             }
 250             return fragmentEntity;
 251         }
 252     }
 253
 254     private FragmentEntity buildFragmentEntityFromFragmentExtracts(final AnchorEntity anchorEntity,
 255                                                                    final String normalizedXpath) {
 256         final FragmentEntity fragmentEntity;
 257         final List<FragmentExtract> fragmentExtracts =
 258                 fragmentRepository.findByAnchorIdAndParentXpath(anchorEntity.getId(), normalizedXpath);
 259         log.debug("Fetched {} fragment entities by anchor {} and cps path {}.",
 260                 fragmentExtracts.size(), anchorEntity.getName(), normalizedXpath);
 261         fragmentEntity = FragmentEntityArranger.toFragmentEntityTree(anchorEntity, fragmentExtracts);
 262         return fragmentEntity;
 263     }
 264
 265     @Override
 266     public List<DataNode> queryDataNodes(final String dataspaceName, final String anchorName, final String cpsPath,
 267                                          final FetchDescendantsOption fetchDescendantsOption) {
 268         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 269         final AnchorEntity anchorEntity = anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
 270         final CpsPathQuery cpsPathQuery;
 271         try {
 272             cpsPathQuery = CpsPathUtil.getCpsPathQuery(cpsPath);
 273         } catch (final PathParsingException e) {
 274             throw new CpsPathException(e.getMessage());
 275         }
 276         List<FragmentEntity> fragmentEntities =
 277                 fragmentRepository.findByAnchorAndCpsPath(anchorEntity.getId(), cpsPathQuery);
 278         if (cpsPathQuery.hasAncestorAxis()) {
 279             final Set<String> ancestorXpaths = processAncestorXpath(fragmentEntities, cpsPathQuery);
 280             fragmentEntities = ancestorXpaths.isEmpty() ? Collections.emptyList()
 281                     : fragmentRepository.findAllByAnchorAndXpathIn(anchorEntity, ancestorXpaths);
 282         }
 283         return createDataNodesFromFragmentEntities(fetchDescendantsOption, anchorEntity,
 284                 fragmentEntities);
 285     }
 286
 287     private List<DataNode> createDataNodesFromFragmentEntities(final FetchDescendantsOption fetchDescendantsOption,
 288                                                                final AnchorEntity anchorEntity,
 289                                                                final List<FragmentEntity> fragmentEntities) {
 290         final List<DataNode> dataNodes = new ArrayList<>(fragmentEntities.size());
 291         for (final FragmentEntity proxiedFragmentEntity : fragmentEntities) {
 292             final DataNode dataNode;
 293             if (FetchDescendantsOption.OMIT_DESCENDANTS.equals(fetchDescendantsOption)) {
 294                 dataNode = toDataNode(proxiedFragmentEntity, fetchDescendantsOption);
 295             } else {
 296                 final String normalizedXpath = getNormalizedXpath(proxiedFragmentEntity.getXpath());
 297                 final FragmentEntity unproxiedFragmentEntity = buildFragmentEntityFromFragmentExtracts(anchorEntity,
 298                         normalizedXpath);
 299                 dataNode = toDataNode(unproxiedFragmentEntity, fetchDescendantsOption);
 300             }
 301             dataNodes.add(dataNode);
 302         }
 303         return Collections.unmodifiableList(dataNodes);
 304     }
 305
 306     private static String getNormalizedXpath(final String xpathSource) {
 307         final String normalizedXpath;
 308         try {
 309             normalizedXpath = CpsPathUtil.getNormalizedXpath(xpathSource);
 310         } catch (final PathParsingException e) {
 311             throw new CpsPathException(e.getMessage());
 312         }
 313         return normalizedXpath;
 314     }
 315
 316     @Override
 317     public String startSession() {
 318         return sessionManager.startSession();
 319     }
 320
 321     @Override
 322     public void closeSession(final String sessionId) {
 323         sessionManager.closeSession(sessionId, SessionManager.WITH_COMMIT);
 324     }
 325
 326     @Override
 327     public void lockAnchor(final String sessionId, final String dataspaceName,
 328                            final String anchorName, final Long timeoutInMilliseconds) {
 329         sessionManager.lockAnchor(sessionId, dataspaceName, anchorName, timeoutInMilliseconds);
 330     }
 331
 332     private static Set<String> processAncestorXpath(final List<FragmentEntity> fragmentEntities,
 333                                                     final CpsPathQuery cpsPathQuery) {
 334         final Set<String> ancestorXpath = new HashSet<>();
 335         final Pattern pattern =
 336                 Pattern.compile("([\\s\\S]*\\/" + Pattern.quote(cpsPathQuery.getAncestorSchemaNodeIdentifier())
 337                         + REG_EX_FOR_OPTIONAL_LIST_INDEX + "\\/[\\s\\S]*");
 338         for (final FragmentEntity fragmentEntity : fragmentEntities) {
 339             final Matcher matcher = pattern.matcher(fragmentEntity.getXpath());
 340             if (matcher.matches()) {
 341                 ancestorXpath.add(matcher.group(1));
 342             }
 343         }
 344         return ancestorXpath;
 345     }
 346
 347     private DataNode toDataNode(final FragmentEntity fragmentEntity,
 348                                 final FetchDescendantsOption fetchDescendantsOption) {
 349         final List<DataNode> childDataNodes = getChildDataNodes(fragmentEntity, fetchDescendantsOption);
 350         Map<String, Object> leaves = new HashMap<>();
 351         if (fragmentEntity.getAttributes() != null) {
 352             leaves = jsonObjectMapper.convertJsonString(fragmentEntity.getAttributes(), Map.class);
 353         }
 354         return new DataNodeBuilder()
 355                 .withXpath(fragmentEntity.getXpath())
 356                 .withLeaves(leaves)
 357                 .withChildDataNodes(childDataNodes).build();
 358     }
 359
 360     private List<DataNode> getChildDataNodes(final FragmentEntity fragmentEntity,
 361                                              final FetchDescendantsOption fetchDescendantsOption) {
 362         if (fetchDescendantsOption.hasNext()) {
 363             return fragmentEntity.getChildFragments().stream()
 364                     .map(childFragmentEntity -> toDataNode(childFragmentEntity, fetchDescendantsOption.next()))
 365                     .collect(Collectors.toList());
 366         }
 367         return Collections.emptyList();
 368     }
 369
 370     @Override
 371     public void updateDataLeaves(final String dataspaceName, final String anchorName, final String xpath,
 372                                  final Map<String, Object> leaves) {
 373         final FragmentEntity fragmentEntity = getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, xpath);
 374         fragmentEntity.setAttributes(jsonObjectMapper.asJsonString(leaves));
 375         fragmentRepository.save(fragmentEntity);
 376     }
 377
 378     @Override
 379     public void updateDataNodeAndDescendants(final String dataspaceName, final String anchorName,
 380                                              final DataNode dataNode) {
 381         final FragmentEntity fragmentEntity =
 382             getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, dataNode.getXpath());
 383         updateFragmentEntityAndDescendantsWithDataNode(fragmentEntity, dataNode);
 384         try {
 385             fragmentRepository.save(fragmentEntity);
 386         } catch (final StaleStateException staleStateException) {
 387             throw new ConcurrencyException("Concurrent Transactions",
 388                     String.format("dataspace :'%s', Anchor : '%s' and xpath: '%s' is updated by another transaction.",
 389                             dataspaceName, anchorName, dataNode.getXpath()));
 390         }
 391     }
 392
 393     @Override
 394     public void updateDataNodesAndDescendants(final String dataspaceName,
 395                                               final String anchorName,
 396                                               final List<DataNode> dataNodes) {
 397
 398         final Map<DataNode, FragmentEntity> dataNodeFragmentEntityMap = dataNodes.stream()
 399                 .collect(Collectors.toMap(
 400                         dataNode -> dataNode,
 401                         dataNode ->
 402                             getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, dataNode.getXpath())));
 403         dataNodeFragmentEntityMap.forEach(
 404                 (dataNode, fragmentEntity) -> updateFragmentEntityAndDescendantsWithDataNode(fragmentEntity, dataNode));
 405         try {
 406             fragmentRepository.saveAll(dataNodeFragmentEntityMap.values());
 407         } catch (final StaleStateException staleStateException) {
 408             retryUpdateDataNodesIndividually(dataspaceName, anchorName, dataNodeFragmentEntityMap.values());
 409         }
 410     }
 411
 412     private void retryUpdateDataNodesIndividually(final String dataspaceName, final String anchorName,
 413                                                   final Collection<FragmentEntity> fragmentEntities) {
 414         final Collection<String> failedXpaths = new HashSet<>();
 415
 416         fragmentEntities.forEach(dataNodeFragment -> {
 417             try {
 418                 fragmentRepository.save(dataNodeFragment);
 419             } catch (final StaleStateException e) {
 420                 failedXpaths.add(dataNodeFragment.getXpath());
 421             }
 422         });
 423
 424         if (!failedXpaths.isEmpty()) {
 425             final String failedXpathsConcatenated = String.join(",", failedXpaths);
 426             throw new ConcurrencyException("Concurrent Transactions", String.format(
 427                     "DataNodes : %s in Dataspace :'%s' with Anchor : '%s'  are updated by another transaction.",
 428                     failedXpathsConcatenated, dataspaceName, anchorName));
 429         }
 430     }
 431
 432     private void updateFragmentEntityAndDescendantsWithDataNode(final FragmentEntity existingFragmentEntity,
 433                                                                 final DataNode newDataNode) {
 434
 435         existingFragmentEntity.setAttributes(jsonObjectMapper.asJsonString(newDataNode.getLeaves()));
 436
 437         final Map<String, FragmentEntity> existingChildrenByXpath = existingFragmentEntity.getChildFragments().stream()
 438                 .collect(Collectors.toMap(FragmentEntity::getXpath, childFragmentEntity -> childFragmentEntity));
 439
 440         final Collection<FragmentEntity> updatedChildFragments = new HashSet<>();
 441
 442         for (final DataNode newDataNodeChild : newDataNode.getChildDataNodes()) {
 443             final FragmentEntity childFragment;
 444             if (isNewDataNode(newDataNodeChild, existingChildrenByXpath)) {
 445                 childFragment = convertToFragmentWithAllDescendants(
 446                         existingFragmentEntity.getDataspace(), existingFragmentEntity.getAnchor(), newDataNodeChild);
 447             } else {
 448                 childFragment = existingChildrenByXpath.get(newDataNodeChild.getXpath());
 449                 updateFragmentEntityAndDescendantsWithDataNode(childFragment, newDataNodeChild);
 450             }
 451             updatedChildFragments.add(childFragment);
 452         }
 453
 454         existingFragmentEntity.getChildFragments().clear();
 455         existingFragmentEntity.getChildFragments().addAll(updatedChildFragments);
 456     }
 457
 458     @Override
 459     @Transactional
 460     public void replaceListContent(final String dataspaceName, final String anchorName, final String parentNodeXpath,
 461                                    final Collection<DataNode> newListElements) {
 462         final FragmentEntity parentEntity =
 463             getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, parentNodeXpath);
 464         final String listElementXpathPrefix = getListElementXpathPrefix(newListElements);
 465         final Map<String, FragmentEntity> existingListElementFragmentEntitiesByXPath =
 466                 extractListElementFragmentEntitiesByXPath(parentEntity.getChildFragments(), listElementXpathPrefix);
 467         deleteListElements(parentEntity.getChildFragments(), existingListElementFragmentEntitiesByXPath);
 468         final Set<FragmentEntity> updatedChildFragmentEntities = new HashSet<>();
 469         for (final DataNode newListElement : newListElements) {
 470             final FragmentEntity existingListElementEntity =
 471                     existingListElementFragmentEntitiesByXPath.get(newListElement.getXpath());
 472             final FragmentEntity entityToBeAdded = getFragmentForReplacement(parentEntity, newListElement,
 473                     existingListElementEntity);
 474
 475             updatedChildFragmentEntities.add(entityToBeAdded);
 476         }
 477         parentEntity.getChildFragments().addAll(updatedChildFragmentEntities);
 478         fragmentRepository.save(parentEntity);
 479     }
 480
 481     @Override
 482     @Transactional
 483     public void deleteDataNodes(final String dataspaceName, final String anchorName) {
 484         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
 485         anchorRepository.findByDataspaceAndName(dataspaceEntity, anchorName)
 486                 .ifPresent(
 487                         anchorEntity -> fragmentRepository.deleteByAnchorIn(Set.of(anchorEntity)));
 488     }
 489
 490     @Override
 491     @Transactional
 492     public void deleteListDataNode(final String dataspaceName, final String anchorName,
 493                                    final String targetXpath) {
 494         deleteDataNode(dataspaceName, anchorName, targetXpath, true);
 495     }
 496
 497     @Override
 498     @Transactional
 499     public void deleteDataNode(final String dataspaceName, final String anchorName, final String targetXpath) {
 500         deleteDataNode(dataspaceName, anchorName, targetXpath, false);
 501     }
 502
 503     private void deleteDataNode(final String dataspaceName, final String anchorName, final String targetXpath,
 504                                 final boolean onlySupportListNodeDeletion) {
 505         final String parentNodeXpath;
 506         FragmentEntity parentFragmentEntity = null;
 507         boolean targetDeleted;
 508         if (isRootXpath(targetXpath)) {
 509             deleteDataNodes(dataspaceName, anchorName);
 510             targetDeleted = true;
 511         } else {
 512             if (isRootContainerNodeXpath(targetXpath)) {
 513                 parentNodeXpath = targetXpath;
 514             } else {
 515                 parentNodeXpath = targetXpath.substring(0, targetXpath.lastIndexOf('/'));
 516             }
 517             parentFragmentEntity = getFragmentWithoutDescendantsByXpath(dataspaceName, anchorName, parentNodeXpath);
 518             final String lastXpathElement = targetXpath.substring(targetXpath.lastIndexOf('/'));
 519             final boolean isListElement = REG_EX_PATTERN_FOR_LIST_ELEMENT_KEY_PREDICATE
 520                     .matcher(lastXpathElement).find();
 521             if (isListElement) {
 522                 targetDeleted = deleteDataNode(parentFragmentEntity, targetXpath);
 523             } else {
 524                 targetDeleted = deleteAllListElements(parentFragmentEntity, targetXpath);
 525                 final boolean tryToDeleteDataNode = !targetDeleted && !onlySupportListNodeDeletion;
 526                 if (tryToDeleteDataNode) {
 527                     targetDeleted = deleteDataNode(parentFragmentEntity, targetXpath);
 528                 }
 529             }
 530         }
 531         if (!targetDeleted) {
 532             final String additionalInformation = onlySupportListNodeDeletion
 533                     ? "The target is probably not a List." : "";
 534             throw new DataNodeNotFoundException(parentFragmentEntity.getDataspace().getName(),
 535                     parentFragmentEntity.getAnchor().getName(), targetXpath, additionalInformation);
 536         }
 537     }
 538
 539     private boolean deleteDataNode(final FragmentEntity parentFragmentEntity, final String targetXpath) {
 540         final String normalizedTargetXpath = CpsPathUtil.getNormalizedXpath(targetXpath);
 541         if (parentFragmentEntity.getXpath().equals(normalizedTargetXpath)) {
 542             fragmentRepository.delete(parentFragmentEntity);
 543             return true;
 544         }
 545         if (parentFragmentEntity.getChildFragments()
 546                 .removeIf(fragment -> fragment.getXpath().equals(normalizedTargetXpath))) {
 547             fragmentRepository.save(parentFragmentEntity);
 548             return true;
 549         }
 550         return false;
 551     }
 552
 553     private boolean deleteAllListElements(final FragmentEntity parentFragmentEntity, final String listXpath) {
 554         final String normalizedListXpath = CpsPathUtil.getNormalizedXpath(listXpath);
 555         final String deleteTargetXpathPrefix = normalizedListXpath + "[";
 556         if (parentFragmentEntity.getChildFragments()
 557                 .removeIf(fragment -> fragment.getXpath().startsWith(deleteTargetXpathPrefix))) {
 558             fragmentRepository.save(parentFragmentEntity);
 559             return true;
 560         }
 561         return false;
 562     }
 563
 564     private static void deleteListElements(
 565             final Collection<FragmentEntity> fragmentEntities,
 566             final Map<String, FragmentEntity> existingListElementFragmentEntitiesByXPath) {
 567         fragmentEntities.removeAll(existingListElementFragmentEntitiesByXPath.values());
 568     }
 569
 570     private static String getListElementXpathPrefix(final Collection<DataNode> newListElements) {
 571         if (newListElements.isEmpty()) {
 572             throw new CpsAdminException("Invalid list replacement",
 573                     "Cannot replace list elements with empty collection");
 574         }
 575         final String firstChildNodeXpath = newListElements.iterator().next().getXpath();
 576         return firstChildNodeXpath.substring(0, firstChildNodeXpath.lastIndexOf('[') + 1);
 577     }
 578
 579     private FragmentEntity getFragmentForReplacement(final FragmentEntity parentEntity,
 580                                                      final DataNode newListElement,
 581                                                      final FragmentEntity existingListElementEntity) {
 582         if (existingListElementEntity == null) {
 583             return convertToFragmentWithAllDescendants(
 584                     parentEntity.getDataspace(), parentEntity.getAnchor(), newListElement);
 585         }
 586         if (newListElement.getChildDataNodes().isEmpty()) {
 587             copyAttributesFromNewListElement(existingListElementEntity, newListElement);
 588             existingListElementEntity.getChildFragments().clear();
 589         } else {
 590             updateFragmentEntityAndDescendantsWithDataNode(existingListElementEntity, newListElement);
 591         }
 592         return existingListElementEntity;
 593     }
 594
 595     private static boolean isNewDataNode(final DataNode replacementDataNode,
 596                                          final Map<String, FragmentEntity> existingListElementsByXpath) {
 597         return !existingListElementsByXpath.containsKey(replacementDataNode.getXpath());
 598     }
 599
 600     private static boolean isRootContainerNodeXpath(final String xpath) {
 601         return 0 == xpath.lastIndexOf('/');
 602     }
 603
 604     private void copyAttributesFromNewListElement(final FragmentEntity existingListElementEntity,
 605                                                   final DataNode newListElement) {
 606         final FragmentEntity replacementFragmentEntity =
 607                 FragmentEntity.builder().attributes(jsonObjectMapper.asJsonString(
 608                         newListElement.getLeaves())).build();
 609         existingListElementEntity.setAttributes(replacementFragmentEntity.getAttributes());
 610     }
 611
 612     private static Map<String, FragmentEntity> extractListElementFragmentEntitiesByXPath(
 613             final Set<FragmentEntity> childEntities, final String listElementXpathPrefix) {
 614         return childEntities.stream()
 615                 .filter(fragmentEntity -> fragmentEntity.getXpath().startsWith(listElementXpathPrefix))
 616                 .collect(Collectors.toMap(FragmentEntity::getXpath, fragmentEntity -> fragmentEntity));
 617     }
 618
 619     private static boolean isRootXpath(final String xpath) {
 620         return "/".equals(xpath) || "".equals(xpath);
 621     }
 622 }