Package com.vaadin.flow.data.provider

Interface CallbackDataProvider.CountCallback<T,F>

Type Parameters:
T - the type of the items to count
F - the type of the optional filter in the query, Void if filtering is not supported
All Superinterfaces:
Serializable
Enclosing class:
CallbackDataProvider<T,F>
Functional Interface:
This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
@FunctionalInterface public static interface CallbackDataProvider.CountCallback<T,F> extends Serializable
Callback interface for counting the number of items in a backend based on a query.

  • Method Summary

    Modifier and Type
    Method
    Description
    int
    count(Query<T,F> query)
    Counts the number of available items based on a query.

  • Method Details

    • count

      int count(Query<T,F> query)
      Counts the number of available items based on a query. The query optionally defines any filtering to use through Query.getFilter(). The query also contains information about paging and sorting although that information is generally not applicable for determining the number of items.
      Parameters:
      query - the query that defines which items to count
      Returns:
      the number of available items