odata2-annotation-processor/annotation-processor-core/src/main/java/org/apache/olingo/odata2/annotation/processor/core/ListsProcessor.java [220:245]:
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  public ODataResponse countEntitySet(final GetEntitySetCountUriInfo uriInfo, final String contentType)
      throws ODataException {
    ArrayList<Object> data = new ArrayList<Object>();
    try {
      data.addAll((List<?>) retrieveData(
          uriInfo.getStartEntitySet(),
          uriInfo.getKeyPredicates(),
          uriInfo.getFunctionImport(),
          mapFunctionParameters(uriInfo.getFunctionImportParameters()),
          uriInfo.getNavigationSegments()));
    } catch (final ODataNotFoundException e) {
      data.clear();
    }

    applySystemQueryOptions(
        uriInfo.getTargetEntitySet(),
        data,
        uriInfo.getFilter(),
        null,
        null,
        null,
        uriInfo.getSkip(),
        uriInfo.getTop());

    return ODataResponse.fromResponse(EntityProvider.writeText(String.valueOf(data.size()))).build();
  }
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odata2-lib/odata-ref/src/main/java/org/apache/olingo/odata2/ref/processor/ListsProcessor.java [226:251]:
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  public ODataResponse countEntitySet(final GetEntitySetCountUriInfo uriInfo, final String contentType)
      throws ODataException {
    ArrayList<Object> data = new ArrayList<Object>();
    try {
      data.addAll((List<?>) retrieveData(
          uriInfo.getStartEntitySet(),
          uriInfo.getKeyPredicates(),
          uriInfo.getFunctionImport(),
          mapFunctionParameters(uriInfo.getFunctionImportParameters()),
          uriInfo.getNavigationSegments()));
    } catch (final ODataNotFoundException e) {
      data.clear();
    }

    applySystemQueryOptions(
        uriInfo.getTargetEntitySet(),
        data,
        uriInfo.getFilter(),
        null,
        null,
        null,
        uriInfo.getSkip(),
        uriInfo.getTop());

    return ODataResponse.fromResponse(EntityProvider.writeText(String.valueOf(data.size()))).build();
  }
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