Interface ResultListTransformer<T>

Type Parameters:
T - The result list element type
All Known Subinterfaces:
ResultTransformer<T>
All Known Implementing Classes:
AliasToBeanConstructorResultTransformer, AliasToBeanResultTransformer, AliasToEntityMapResultTransformer, NativeQueryTupleTransformer, ToListResultTransformer
Functional Interface:
This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
@Incubating @FunctionalInterface public interface ResultListTransformer<T>
Defines some processing performed on the overall result List of a Query before the result list is returned to the caller.
See Also:

  • Method Summary

    Modifier and Type
    Method
    Description
    List<T>
    transformList(List<T> resultList)
    Here we have an opportunity to perform transformation on the query result as a whole.
    static <T> ResultListTransformer<T>
    uniqueResultTransformer()
    A ResultListTransformer which collapses a list of results into a single result when all results are equal, or throws NonUniqueResultException otherwise.

  • Method Details

    • transformList

      List<T> transformList(List<T> resultList)
      Here we have an opportunity to perform transformation on the query result as a whole. This might be useful to convert from one collection type to another or to remove duplicates from the result, etc.
      Parameters:
      resultList - The result list as would otherwise be returned by the Query without the intervention of this ResultListTransformer
      Returns:
      The transformed result.

    • uniqueResultTransformer

      static <T> ResultListTransformer<T> uniqueResultTransformer()
      A ResultListTransformer which collapses a list of results into a single result when all results are equal, or throws NonUniqueResultException otherwise.
      Type Parameters:
      T - The result list element type
      Since:
      7.3