Interface RowReducer<C,R>

Type Parameters:

C - mutable result container type

R - result element type

All Known Subinterfaces:

LinkedHashMapRowReducer<K,V>

public interface RowReducer<C,R>

Reduces row data from a ResultSet into a stream of result elements. Useful for collapsing one-to-many joins.

See Also:

• ResultBearing.reduceRows(RowReducer)

Method Summary

Modifier and Type	Method	Description
void	accumulate(C container, RowView rowView)	Accumulate data from the current row into the result container.
C	container()	Returns a new, empty result container.
Stream<R>	stream(C container)	Returns a stream of result elements from the result container.

Method Details

container

C container()

Returns a new, empty result container.

Returns:

a new result container.

accumulate

void accumulate(C container,
 RowView rowView)

Accumulate data from the current row into the result container. Do not attempt to accumulate the RowView itself into the result container--it is only valid within the accumulate() method invocation. Instead, extract mapped types from the RowView by calling RowView.getRow() or RowView.getColumn() and store those values in the container.

Parameters:

container - the result container

rowView - row view over the current result set row.

stream

Stream<R> stream(C container)

Returns a stream of result elements from the result container.

Parameters:

container - the result container

Returns:

stream of result elements.