odata2-annotation-processor/annotation-processor-core/src/main/java/org/apache/olingo/odata2/annotation/processor/core/ListsProcessor.java [797:838]:
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  public ODataResponse executeFunctionImport(final GetFunctionImportUriInfo uriInfo, final String contentType)
      throws ODataException {
    final EdmFunctionImport functionImport = uriInfo.getFunctionImport();
    final EdmType type = functionImport.getReturnType().getType();

    final Object data = dataSource.readData(
        functionImport,
        mapFunctionParameters(uriInfo.getFunctionImportParameters()),
        null);

    if (data == null) {
      throw new ODataNotFoundException(ODataHttpException.COMMON);
    }

    Object value;
    if (type.getKind() == EdmTypeKind.SIMPLE) {
      value = type == EdmSimpleTypeKind.Binary.getEdmSimpleTypeInstance() ?
          ((BinaryData) data).getData() : data;
    } else if (functionImport.getReturnType().getMultiplicity() == EdmMultiplicity.MANY) {
      List<Map<String, Object>> values = new ArrayList<Map<String, Object>>();
      for (final Object typeData : (List<?>) data) {
        values.add(getStructuralTypeValueMap(typeData, (EdmStructuralType) type));
      }
      value = values;
    } else {
      value = getStructuralTypeValueMap(data, (EdmStructuralType) type);
    }

    ODataContext context = getContext();

    final EntityProviderWriteProperties entryProperties = EntityProviderWriteProperties
        .serviceRoot(context.getPathInfo().getServiceRoot()).build();

    final int timingHandle = context.startRuntimeMeasurement("EntityProvider", "writeFunctionImport");

    final ODataResponse response =
        EntityProvider.writeFunctionImport(contentType, functionImport, value, entryProperties);

    context.stopRuntimeMeasurement(timingHandle);

    return ODataResponse.fromResponse(response).build();
  }
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odata2-lib/odata-ref/src/main/java/org/apache/olingo/odata2/ref/processor/ListsProcessor.java [807:848]:
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  public ODataResponse executeFunctionImport(final GetFunctionImportUriInfo uriInfo, final String contentType)
      throws ODataException {
    final EdmFunctionImport functionImport = uriInfo.getFunctionImport();
    final EdmType type = functionImport.getReturnType().getType();

    final Object data = dataSource.readData(
        functionImport,
        mapFunctionParameters(uriInfo.getFunctionImportParameters()),
        null);

    if (data == null) {
      throw new ODataNotFoundException(ODataHttpException.COMMON);
    }

    Object value;
    if (type.getKind() == EdmTypeKind.SIMPLE) {
      value = type == EdmSimpleTypeKind.Binary.getEdmSimpleTypeInstance() ?
          ((BinaryData) data).getData() : data;
    } else if (functionImport.getReturnType().getMultiplicity() == EdmMultiplicity.MANY) {
      List<Map<String, Object>> values = new ArrayList<Map<String, Object>>();
      for (final Object typeData : (List<?>) data) {
        values.add(getStructuralTypeValueMap(typeData, (EdmStructuralType) type));
      }
      value = values;
    } else {
      value = getStructuralTypeValueMap(data, (EdmStructuralType) type);
    }

    ODataContext context = getContext();

    final EntityProviderWriteProperties entryProperties = EntityProviderWriteProperties
        .serviceRoot(context.getPathInfo().getServiceRoot()).build();

    final int timingHandle = context.startRuntimeMeasurement("EntityProvider", "writeFunctionImport");

    final ODataResponse response =
        EntityProvider.writeFunctionImport(contentType, functionImport, value, entryProperties);

    context.stopRuntimeMeasurement(timingHandle);

    return ODataResponse.fromResponse(response).build();
  }
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