odata2-annotation-processor/annotation-processor-core/src/main/java/org/apache/olingo/odata2/annotation/processor/core/ListsProcessor.java [467:492]:
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  public ODataResponse deleteEntityLink(final DeleteUriInfo uriInfo, final String contentType) throws ODataException {
    final List<NavigationSegment> navigationSegments = uriInfo.getNavigationSegments();
    final List<NavigationSegment> previousSegments = navigationSegments.subList(0, navigationSegments.size() - 1);

    final Object sourceData = retrieveData(
        uriInfo.getStartEntitySet(),
        uriInfo.getKeyPredicates(),
        uriInfo.getFunctionImport(),
        mapFunctionParameters(uriInfo.getFunctionImportParameters()),
        previousSegments);

    final EdmEntitySet entitySet = previousSegments.isEmpty() ?
        uriInfo.getStartEntitySet() : previousSegments.get(previousSegments.size() - 1).getEntitySet();
    final EdmEntitySet targetEntitySet = uriInfo.getTargetEntitySet();
    final Map<String, Object> keys = mapKey(uriInfo.getTargetKeyPredicates());

    final Object targetData = dataSource.readRelatedData(entitySet, sourceData, targetEntitySet, keys);

    if (targetData == null) {
      throw new ODataNotFoundException(ODataNotFoundException.ENTITY);
    }

    dataSource.deleteRelation(entitySet, sourceData, targetEntitySet, keys);

    return ODataResponse.newBuilder().build();
  }
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odata2-lib/odata-ref/src/main/java/org/apache/olingo/odata2/ref/processor/ListsProcessor.java [474:500]:
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  public ODataResponse deleteEntityLink(final DeleteUriInfo uriInfo, final String contentType) throws ODataException {
    final List<NavigationSegment> navigationSegments = uriInfo.getNavigationSegments();
    final List<NavigationSegment> previousSegments = navigationSegments.subList(0, navigationSegments.size() - 1);

    final Object sourceData = retrieveData(
        uriInfo.getStartEntitySet(),
        uriInfo.getKeyPredicates(),
        uriInfo.getFunctionImport(),
        mapFunctionParameters(uriInfo.getFunctionImportParameters()),
        previousSegments);

    final EdmEntitySet entitySet = previousSegments.isEmpty() ?
        uriInfo.getStartEntitySet() : previousSegments.get(previousSegments.size() - 1).getEntitySet();
    final EdmEntitySet targetEntitySet = uriInfo.getTargetEntitySet();
    final Map<String, Object> keys = mapKey(uriInfo.getTargetKeyPredicates());

    final Object targetData = dataSource.readRelatedData(entitySet, sourceData, targetEntitySet, keys);

    // if (!appliesFilter(targetData, uriInfo.getFilter()))
    if (targetData == null) {
      throw new ODataNotFoundException(ODataNotFoundException.ENTITY);
    }

    dataSource.deleteRelation(entitySet, sourceData, targetEntitySet, keys);

    return ODataResponse.newBuilder().build();
  }
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