org.apache.hadoop.record
Class RecordComparator

java.lang.Object
  org.apache.hadoop.io.WritableComparator
      org.apache.hadoop.record.RecordComparator

All Implemented Interfaces:

Comparator, RawComparator

public abstract class RecordComparator
extends WritableComparator

A raw record comparator base class

Constructor Summary

protected

RecordComparator(Class<? extends WritableComparable> recordClass) Construct a raw Record comparison implementation.

Method Summary

abstract int	compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) Optimization hook.
static void	define(Class c, RecordComparator comparator) Register an optimized comparator for a Record implementation.

Methods inherited from class org.apache.hadoop.io.WritableComparator

compare, compare, compareBytes, define, get, getKeyClass, hashBytes, hashBytes, newKey, readDouble, readFloat, readInt, readLong, readUnsignedShort, readVInt, readVLong

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Comparator

equals

Constructor Detail

RecordComparator

protected RecordComparator(Class<? extends WritableComparable> recordClass)

Construct a raw Record comparison implementation.

Method Detail

compare

public abstract int compare(byte[] b1,
                            int s1,
                            int l1,
                            byte[] b2,
                            int s2,
                            int l2)

Description copied from class: WritableComparator

Optimization hook. Override this to make SequenceFile.Sorter's scream.

The default implementation reads the data into two WritableComparables (using Writable.readFields(DataInput), then calls WritableComparator.compare(WritableComparable,WritableComparable).

Specified by:

compare in interface RawComparator

Overrides:

compare in class WritableComparator

define

public static void define(Class c,
                          RecordComparator comparator)

Register an optimized comparator for a Record implementation.

Parameters:

c - record classs for which a raw comparator is provided

comparator - Raw comparator instance for class c