com.bigdata.bop.ap

Enum SampleIndex.SampleType

java.lang.Object

java.lang.Enum<SampleIndex.SampleType>

com.bigdata.bop.ap.SampleIndex.SampleType

All Implemented Interfaces:

Serializable, Comparable<SampleIndex.SampleType>

Enclosing class:

SampleIndex<E>

public static enum SampleIndex.SampleType
extends Enum<SampleIndex.SampleType>

Typesafe enumeration of different kinds of index sampling strategies.

Enum Constant Summary

Enum Constants

Enum Constant and Description
DENSE The samples will be dense and may bave a front bias.
EVEN Samples are taken at even space offsets.
RANDOM Sample offsets are computed randomly.

Method Summary

Methods

Modifier and Type	Method and Description
static SampleIndex.SampleType	valueOf(String name) Returns the enum constant of this type with the specified name.
static SampleIndex.SampleType[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

EVEN

public static final SampleIndex.SampleType EVEN

Samples are taken at even space offsets. This produces a sample without any random effects. Re-sampling an index having the same data with the same key-range and the limit will always return the same results. This is useful to make unit test repeatable.

RANDOM

public static final SampleIndex.SampleType RANDOM

Sample offsets are computed randomly.

DENSE

public static final SampleIndex.SampleType DENSE

The samples will be dense and may bave a front bias. This mode emphasizes the locality of the samples on the index pages and minimizes the IO associated with sampling.

Method Detail

values

public static SampleIndex.SampleType[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (SampleIndex.SampleType c : SampleIndex.SampleType.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static SampleIndex.SampleType valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null