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
|
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 |
RecordComparator
protected RecordComparator(Class<? extends WritableComparable> recordClass)
- Construct a raw
Record comparison implementation.
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 providedcomparator - Raw comparator instance for class c
Copyright © 2009 The Apache Software Foundation