cascading.tuple

Interface Comparison<T>

public interface Comparison<T>

The Comparison interface allows specific underlying type mechanisms to additionally return relevant Comparator implementations when required internally.

In the case of Hadoop, Serialization implementations that present alternative serialization implementations for custom types manged by Tuples should also implement the getComparator(Class) method.

During runtime Cascading can identify and use the correct Comparator during grouping operations if it was not given explicitly on the Fields.setComparator(Comparable, java.util.Comparator) family of methods.

See the class BytesSerialization for an example.

see cascading.tuple.hadoop.BytesSerialization

Method Summary

Methods

Modifier and Type	Method and Description
Comparator<T>	getComparator(Class<T> type)

Method Detail

getComparator

Comparator<T> getComparator(Class<T> type)