Package com.querydsl.core.group

Interface GroupExpression<T,R>

Type Parameters:
T - Element type
R - Target type (e.g. List, Set)
All Superinterfaces:
Expression<R>, Serializable
All Known Implementing Classes:
AbstractGroupExpression, MixinGroupExpression
public interface GroupExpression<T,R> extends Expression<R>
Defines the way results of a given expression are grouped. GroupExpressions are also used to access values of a given GroupExpression within a Group. GroupExpressions are stateless wrappers for Expressions that know how to collect row values into a group.
Author:
sasa, tiwe

  • Method Details

    • getExpression

      Expression<T> getExpression()
      Get the expression wrapped by this group definition
      Returns:
      wrapped expression

    • createGroupCollector

      GroupCollector<T,R> createGroupCollector()
      Create a new GroupCollector to collect values belonging to this group.
      Returns:
      new GroupCollector