org.apache.hadoop.io
Class Text.Comparator

java.lang.Object
  extended by org.apache.hadoop.io.WritableComparator
      extended by org.apache.hadoop.io.Text.Comparator
All Implemented Interfaces:
Comparator, RawComparator
Enclosing class:
Text

public static class Text.Comparator
extends WritableComparator

A WritableComparator optimized for Text keys.


Constructor Summary
Text.Comparator()
           
 
Method Summary
 int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2)
          Optimization hook.
 
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

Text.Comparator

public Text.Comparator()
Method Detail

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 WritableComparator
Parameters:
b1 - The first byte array.
s1 - The position index in b1. The object under comparison's starting index.
l1 - The length of the object in b1.
b2 - The second byte array.
s2 - The position index in b2. The object under comparison's starting index.
l2 - The length of the object under comparison in b2.
Returns:
An integer result of the comparison.


Copyright © 2013 Apache Software Foundation. All Rights Reserved.