org.apache.hadoop.record

类 RecordComparator

java.lang.Object

org.apache.hadoop.io.WritableComparator

org.apache.hadoop.record.RecordComparator

所有已实现的接口:

Comparator, RawComparator

public abstract class RecordComparator
extends WritableComparator

A raw record comparator base class

构造器概要

构造器

限定符	构造器和说明
protected	RecordComparator(Class<? extends WritableComparable> recordClass) Construct a raw Record comparison implementation.

方法概要

方法

限定符和类型	方法和说明
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.

从类继承的方法 org.apache.hadoop.io.WritableComparator

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

从类继承的方法 java.lang.Object

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

从接口继承的方法 java.util.Comparator

equals

构造器详细资料

RecordComparator

protected RecordComparator(Class<? extends WritableComparable> recordClass)

Construct a raw Record comparison implementation.

方法详细资料

compare

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

从类复制的说明: 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).

指定者:

compare 在接口中 RawComparator

覆盖:

compare 在类中 WritableComparator

define

public static void define(Class c,
          RecordComparator comparator)

Register an optimized comparator for a Record implementation.

参数:

c - record classs for which a raw comparator is provided

comparator - Raw comparator instance for class c