odata2-annotation-processor/annotation-processor-core/src/main/java/org/apache/olingo/odata2/annotation/processor/core/ListsProcessor.java [841:863]:
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  public ODataResponse executeFunctionImportValue(final GetFunctionImportUriInfo uriInfo, final String contentType)
      throws ODataException {
    final EdmFunctionImport functionImport = uriInfo.getFunctionImport();
    final EdmSimpleType type = (EdmSimpleType) functionImport.getReturnType().getType();

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

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

    ODataResponse response;
    if (type == EdmSimpleTypeKind.Binary.getEdmSimpleTypeInstance()) {
      response = EntityProvider.writeBinary(((BinaryData) data).getMimeType(), ((BinaryData) data).getData());
    } else {
      final String value = type.valueToString(data, EdmLiteralKind.DEFAULT, null);
      response = EntityProvider.writeText(value == null ? "" : value);
    }
    return ODataResponse.fromResponse(response).build();
  }
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odata2-lib/odata-ref/src/main/java/org/apache/olingo/odata2/ref/processor/ListsProcessor.java [851:873]:
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  public ODataResponse executeFunctionImportValue(final GetFunctionImportUriInfo uriInfo, final String contentType)
      throws ODataException {
    final EdmFunctionImport functionImport = uriInfo.getFunctionImport();
    final EdmSimpleType type = (EdmSimpleType) functionImport.getReturnType().getType();

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

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

    ODataResponse response;
    if (type == EdmSimpleTypeKind.Binary.getEdmSimpleTypeInstance()) {
      response = EntityProvider.writeBinary(((BinaryData) data).getMimeType(), ((BinaryData) data).getData());
    } else {
      final String value = type.valueToString(data, EdmLiteralKind.DEFAULT, null);
      response = EntityProvider.writeText(value == null ? "" : value);
    }
    return ODataResponse.fromResponse(response).build();
  }
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