scim-server-examples/scim-server-jersey/src/main/java/org/apache/directory/scim/example/jersey/service/InMemoryGroupService.java [59:158]:
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  private SchemaRegistry schemaRegistry;

  private PatchHandler patchHandler;

  @Inject
  public InMemoryGroupService(SchemaRegistry schemaRegistry, PatchHandler patchHandler) {
    this.schemaRegistry = schemaRegistry;
    this.patchHandler = patchHandler;
  }

  protected InMemoryGroupService() {}

  @PostConstruct
  public void init() {
    ScimGroup group = new ScimGroup();
    group.setId(UUID.randomUUID().toString());
    group.setDisplayName("example-group");
    group.setExternalId("example-group");
    groups.put(group.getId(), group);
  }

  @Override
  public Class<ScimGroup> getResourceClass() {
    return ScimGroup.class;
  }

  @Override
  public ScimGroup create(ScimGroup resource) throws UnableToCreateResourceException {
    String id = UUID.randomUUID().toString();

    // if the external ID is not set, use the displayName instead
    if (StringUtils.isEmpty(resource.getExternalId())) {
      resource.setExternalId(resource.getDisplayName());
    }

    // check to make sure the group doesn't already exist
    boolean existingGroupFound = groups.values().stream()
      .anyMatch(group -> resource.getExternalId().equals(group.getExternalId()));
    if (existingGroupFound) {
      // HTTP leaking into data layer
      throw new UnableToCreateResourceException(Response.Status.CONFLICT, "Group '" + resource.getExternalId() + "' already exists.");
    }

    resource.setId(id);
    groups.put(id, resource);
    return resource;
  }

  @Override
  public ScimGroup update(String id, Set<ETag> etags, ScimGroup resource, Set<AttributeReference> includedAttributeReferences, Set<AttributeReference> excludedAttributeReferences) throws ResourceException {
    if (!groups.containsKey(id)) {
      throw new ResourceNotFoundException(id);
    }

    groups.put(id, resource);
    return resource;
  }

  @Override
  public ScimGroup patch(String id, Set<ETag> etags, List<PatchOperation> patchOperations, Set<AttributeReference> includedAttributeReferences, Set<AttributeReference> excludedAttributeReferences) throws ResourceException {
    if (!groups.containsKey(id)) {
      throw new ResourceNotFoundException(id);
    }

    ScimGroup resource = patchHandler.apply(get(id), patchOperations);
    groups.put(id, resource);
    return resource;
  }

  @Override
  public ScimGroup get(String id) {
    return groups.get(id);
  }

  @Override
  public void delete(String id) throws ResourceException {
    if (groups.remove(id) == null) {
      throw new ResourceNotFoundException(id);
    }
  }

  @Override
  public FilterResponse<ScimGroup> find(Filter filter, PageRequest pageRequest, SortRequest sortRequest) {
    long count = pageRequest.getCount() != null ? pageRequest.getCount() : groups.size();
    long startIndex = pageRequest.getStartIndex() != null
      ? pageRequest.getStartIndex() - 1 // SCIM is 1-based indexed
      : 0;

    List<ScimGroup> result = groups.values().stream()
      .skip(startIndex)
      .limit(count)
      .filter(FilterExpressions.inMemory(filter, schemaRegistry.getSchema(ScimGroup.SCHEMA_URI)))
      .collect(Collectors.toList());

    return new FilterResponse<>(result, pageRequest, result.size());
  }

  @Override
  public List<Class<? extends ScimExtension>> getExtensionList() {
    return Collections.emptyList();
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scim-server-examples/scim-server-quarkus/src/main/java/org/apache/directory/scim/example/quarkus/service/InMemoryGroupService.java [59:156]:
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  private SchemaRegistry schemaRegistry;

  private PatchHandler patchHandler;

  @Inject
  public InMemoryGroupService(SchemaRegistry schemaRegistry, PatchHandler patchHandler) {
    this.schemaRegistry = schemaRegistry;
    this.patchHandler = patchHandler;
  }

  protected InMemoryGroupService() {}

  @PostConstruct
  public void init() {
    ScimGroup group = new ScimGroup();
    group.setId(UUID.randomUUID().toString());
    group.setDisplayName("example-group");
    group.setExternalId("example-group");
    groups.put(group.getId(), group);
  }

  @Override
  public Class<ScimGroup> getResourceClass() {
    return ScimGroup.class;
  }

  @Override
  public ScimGroup create(ScimGroup resource) throws UnableToCreateResourceException {
    String id = UUID.randomUUID().toString();

    // if the external ID is not set, use the displayName instead
    if (StringUtils.isEmpty(resource.getExternalId())) {
      resource.setExternalId(resource.getDisplayName());
    }

    // check to make sure the group doesn't already exist
    boolean existingGroupFound = groups.values().stream()
      .anyMatch(group -> resource.getExternalId().equals(group.getExternalId()));
    if (existingGroupFound) {
      // HTTP leaking into data layer
      throw new UnableToCreateResourceException(Response.Status.CONFLICT, "Group '" + resource.getExternalId() + "' already exists.");
    }

    resource.setId(id);
    groups.put(id, resource);
    return resource;
  }

  @Override
  public ScimGroup update(String id, Set<ETag> etags, ScimGroup resource, Set<AttributeReference> includedAttributeReferences, Set<AttributeReference> excludedAttributeReferences) throws ResourceException {
    if (!groups.containsKey(id)) {
      throw new ResourceNotFoundException(id);
    }
    groups.put(id, resource);
    return resource;
  }

  @Override
  public ScimGroup patch(String id, Set<ETag> etags, List<PatchOperation> patchOperations, Set<AttributeReference> includedAttributeReferences, Set<AttributeReference> excludedAttributeReferences) throws ResourceException {
    if (!groups.containsKey(id)) {
      throw new ResourceNotFoundException(id);
    }
    ScimGroup resource = patchHandler.apply(get(id), patchOperations);
    groups.put(id, resource);
    return resource;
  }

  @Override
  public ScimGroup get(String id) {
    return groups.get(id);
  }

  @Override
  public void delete(String id) throws ResourceException {
    if (groups.remove(id) == null) {
      throw new ResourceNotFoundException(id);
    }
  }

  @Override
  public FilterResponse<ScimGroup> find(Filter filter, PageRequest pageRequest, SortRequest sortRequest) {
    long count = pageRequest.getCount() != null ? pageRequest.getCount() : groups.size();
    long startIndex = pageRequest.getStartIndex() != null
      ? pageRequest.getStartIndex() - 1 // SCIM is 1-based indexed
      : 0;

    List<ScimGroup> result = groups.values().stream()
      .skip(startIndex)
      .limit(count)
      .filter(FilterExpressions.inMemory(filter, schemaRegistry.getSchema(ScimGroup.SCHEMA_URI)))
      .collect(Collectors.toList());

    return new FilterResponse<>(result, pageRequest, result.size());
  }

  @Override
  public List<Class<? extends ScimExtension>> getExtensionList() {
    return Collections.emptyList();
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