com.bigdata.btree.raba.codec

Class RandomKeysGenerator

java.lang.Object

com.bigdata.btree.raba.codec.RandomKeysGenerator

All Implemented Interfaces:

IRabaGenerator

public class RandomKeysGenerator
extends Object
implements IRabaGenerator

Random B+Tree keys generator. The keys are variable length unsigned byte[]s of up to maxKeyLength bytes. Random byte[]s are generated and then sorted into unsigned byte[] order.

Version:

$Id$

Author:

Bryan Thompson

Constructor Summary

Constructors

Constructor and Description
RandomKeysGenerator(Random r, int maxKeys, int maxKeyLength)

Method Summary

Methods

Modifier and Type	Method and Description
byte[][]	generateKeys(int nkeys) Generate a set of N random distinct byte[] keys in sorted order using an unsigned byte[] comparison function.
byte[][]	generateValues(int size) Generate B+Tree values (may include nulls).
boolean	isKeysGenerator() Yes.
boolean	isValuesGenerator() No.

Methods inherited from class java.lang.Object

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

Constructor Detail

RandomKeysGenerator

public RandomKeysGenerator(Random r,
                   int maxKeys,
                   int maxKeyLength)

Parameters:

r - The random number generator.

maxKeys - The branching factor (will be the capacity of the array).

maxKeyLength - The maximum length of a key.

Method Detail

isKeysGenerator

public boolean isKeysGenerator()

Yes.

Specified by:

isKeysGenerator in interface IRabaGenerator

isValuesGenerator

public boolean isValuesGenerator()

No.

Specified by:

isValuesGenerator in interface IRabaGenerator

generateKeys

public byte[][] generateKeys(int nkeys)

Generate a set of N random distinct byte[] keys in sorted order using an unsigned byte[] comparison function.

Specified by:

generateKeys in interface IRabaGenerator

Parameters:

nkeys - The #of keys to generate.

Returns:

A byte[][] with nkeys non-null byte[] entries and a capacity of maxKeys.

generateValues

public byte[][] generateValues(int size)

Description copied from interface: IRabaGenerator

Generate B+Tree values (may include nulls).

Specified by:

generateValues in interface IRabaGenerator

Parameters:

size - The #of values.

Returns:

The values.