org.apache.mahout.common
Class IntPairWritable.FirstGroupingComparator

java.lang.Object
  extended by org.apache.hadoop.io.WritableComparator
      extended by org.apache.mahout.common.IntPairWritable.FirstGroupingComparator
All Implemented Interfaces:
Serializable, Comparator, org.apache.hadoop.io.RawComparator
Enclosing class:
IntPairWritable

public static class IntPairWritable.FirstGroupingComparator
extends org.apache.hadoop.io.WritableComparator
implements Serializable

Compare only the first part of the pair, so that reduce is called once for each value of the first part.

See Also:
Serialized Form

Constructor Summary
IntPairWritable.FirstGroupingComparator()
           
 
Method Summary
 int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2)
           
 int compare(Object o1, Object o2)
           
 
Methods inherited from class org.apache.hadoop.io.WritableComparator
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

IntPairWritable.FirstGroupingComparator

public IntPairWritable.FirstGroupingComparator()
Method Detail

compare

public int compare(byte[] b1,
                   int s1,
                   int l1,
                   byte[] b2,
                   int s2,
                   int l2)
Specified by:
compare in interface org.apache.hadoop.io.RawComparator
Overrides:
compare in class org.apache.hadoop.io.WritableComparator

compare

public int compare(Object o1,
                   Object o2)
Specified by:
compare in interface Comparator
Overrides:
compare in class org.apache.hadoop.io.WritableComparator


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