Package org.meteoinfo.data.dataframe.impl

Interface KeyFunction<I>

Type Parameters:

I - the type of the input values

All Superinterfaces:

Function<java.util.List<I>,java.lang.Object>

public interface KeyFunction<I>
extends Function<java.util.List<I>,java.lang.Object>

A function that converts data frame rows to index or group keys.

Implementors define Function.apply(Object) to accept a data frame row as input and return a key value, most commonly used by DataFrame#groupBy(KeyFunction).

See Also:

DataFrame#groupBy(KeyFunction)

Method Summary

Methods inherited from interface org.meteoinfo.data.dataframe.impl.Function

apply