org.apache.hadoop.io
Class LongWritable.DecreasingComparator

java.lang.Object
  org.apache.hadoop.io.WritableComparator
      org.apache.hadoop.io.LongWritable.Comparator
          org.apache.hadoop.io.LongWritable.DecreasingComparator

All Implemented Interfaces:

Comparator, RawComparator

Enclosing class:

LongWritable

public static class LongWritable.DecreasingComparator
extends LongWritable.Comparator

A decreasing Comparator optimized for LongWritable.

Constructor Summary

LongWritable.DecreasingComparator()

Method Summary

int	compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) Optimization hook.
int	compare(WritableComparable a, WritableComparable b) Compare two WritableComparables.

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

compare, compareBytes, define, get, getKeyClass, 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

LongWritable.DecreasingComparator

public LongWritable.DecreasingComparator()

Method Detail

compare

public int compare(WritableComparable a,
                   WritableComparable b)

Description copied from class: WritableComparator

Compare two WritableComparables.

The default implementation uses the natural ordering, calling Comparable.compareTo(Object).

Overrides:

compare in class WritableComparator

compare

public 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 LongWritable.Comparator