com.querydsl.core.group

Interface GroupExpression<T,R>

Type Parameters:

T - Element type

R - Target type (e.g. List, Set)

All Superinterfaces:

Expression<R>, java.io.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 Summary

Modifier and Type	Method and Description
GroupCollector<T,R>	createGroupCollector() Create a new GroupCollector to collect values belonging to this group.
Expression<T>	getExpression() Get the expression wrapped by this group definition

Methods inherited from interface com.querydsl.core.types.Expression

accept, getType

Method Detail

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