net.openhft.koloboke.collect.hash

Interface ShortHashFactory<F extends ShortHashFactory<F>>

Type Parameters:

F - the concrete factory type which extends this interface

All Superinterfaces:

ContainerFactory<F>, HashContainerFactory<F>

All Known Subinterfaces:

HashShortByteMapFactory, HashShortCharMapFactory, HashShortDoubleMapFactory, HashShortFloatMapFactory, HashShortIntMapFactory, HashShortLongMapFactory, HashShortObjMapFactory<V>, HashShortSetFactory, HashShortShortMapFactory

public interface ShortHashFactory<F extends ShortHashFactory<F>>
extends HashContainerFactory<F>

Common configuration for factories of hash containers with short keys.

Currently ShortHashFactory allows to specify consecutive range of keys which could be inserted into hash container - keys domain. This is a performance hint: hash containers might, but aren't required to throw IllegalArgumentException on inserting a key out of the keys domain.

By default, all keys are allowed (keys domain is a whole range of shorts, from Short.MIN_VALUE to Short.MAX_VALUE.

For example, map keys or elements of the set could be unique IDs, counting from 1, thus it's guaranteed that these keys are positive. Or one specific key has a special meaning in the logic of your application. When you are sure that some keys range could never be put into hash container, it is recommended to configure corresponding factory, which extends this interface, with complement of that range as keys domain (or, alternatively, with that range as keys domain complement).

It's OK to specify keys domain which include some actually impossible keys, but you shouldn't leave a single valid key out of the domain. If the set of possible (impossible) keys consist of several ranges, and/or standalone keys, it is still recommended to specify the domain to "forbid" some impossible keys. For example, if possible keys are odd numbers, you should exclude one even number, zero:

 factory = factory.withKeysDomainComplement((short) 0, (short) 0);

Method Summary

Modifier and Type	Method and Description
short	getLowerKeyDomainBound() Returns lower (inclusive) bound of keys domain.
short	getUpperKeyDomainBound() Returns upper (inclusive) bound of keys domain.
F	withKeysDomain(short minPossibleKey, short maxPossibleKey) Returns a copy of this factory with keys domain set to the specified range.
F	withKeysDomainComplement(short minImpossibleKey, short maxImpossibleKey) Returns a copy of this factory with keys domain set to the complement of the specified range.

Methods inherited from interface net.openhft.koloboke.collect.hash.HashContainerFactory

getHashConfig, withHashConfig

Methods inherited from interface net.openhft.koloboke.collect.ContainerFactory

getDefaultExpectedSize, withDefaultExpectedSize

Method Detail

getLowerKeyDomainBound

short getLowerKeyDomainBound()

Returns lower (inclusive) bound of keys domain.

Default: Short.MIN_VALUE.

Returns:

lower (inclusive) bound of keys domain

getUpperKeyDomainBound

short getUpperKeyDomainBound()

Returns upper (inclusive) bound of keys domain.

Default: Short.MAX_VALUE.

Returns:

upper (inclusive) bound of keys domain

withKeysDomain

F withKeysDomain(short minPossibleKey,
                 short maxPossibleKey)

Returns a copy of this factory with keys domain set to the specified range.

This is a performance hint: hash containers might, but aren't required to throw IllegalArgumentException on putting key out of the keys domain.

Example:

 
 // only positive keys
 factory = factory.withKeysDomain((short) 1, Short.MAX_VALUE);

Parameters:

minPossibleKey - lower (inclusive) bound of the target keys domain

maxPossibleKey - upper (inclusive) bound of the target keys domain

Returns:

a copy of this factory with keys domain set to the specified range

Throws:

IllegalArgumentException - if minPossibleKey is greater than maxPossibleKey

withKeysDomainComplement

F withKeysDomainComplement(short minImpossibleKey,
                           short maxImpossibleKey)

Returns a copy of this factory with keys domain set to the complement of the specified range.

This is a performance hint: hash containers might, but aren't required to throw IllegalArgumentException on putting key out of the keys domain.

This method is needed to specify keys domain that include both Short.MIN_VALUE and Short.MAX_VALUE, but with a "hole" somewhere in between. Providing a single withKeysDomain(short, short) method for this and "ordinary" keys domain application is error-prone, because there is no way to distinguish intention (domain with a "hole") and mistakenly reordered arguments while attempting to specify "ordinary" domain.

Example:

 
 // any keys except 0
 factory = factory.withKeysDomainComplement((short) 0, (short) 0);

Parameters:

minImpossibleKey - upper (exclusive) bound of the target keys domain

maxImpossibleKey - lower (exclusive) bound of the target keys domain

Returns:

a copy of this factory with keys domain set to the complement of the specified range

Throws:

IllegalArgumentException - if minImpossibleKey is greater than maxImpossibleKey