Package it.unimi.dsi.sux4j.mph

Class HollowTrieDistributorMonotoneMinimalPerfectHashFunction<T>

java.lang.Object

it.unimi.dsi.fastutil.objects.AbstractObject2LongFunction<K>

it.unimi.dsi.sux4j.mph.AbstractHashFunction<T>

it.unimi.dsi.sux4j.mph.HollowTrieDistributorMonotoneMinimalPerfectHashFunction<T>

All Implemented Interfaces:

Function<T,Long>, Object2LongFunction<T>, Size64, Serializable, Function<T,Long>, ToLongFunction<T>

public class HollowTrieDistributorMonotoneMinimalPerfectHashFunction<T>
extends AbstractHashFunction<T>
implements Size64, Serializable

A monotone minimal perfect hash implementation based on fixed-size bucketing that uses a hollow trie as a distributor.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static final long	serialVersionUID

Fields inherited from class it.unimi.dsi.fastutil.objects.AbstractObject2LongFunction

defRetValue

Constructor Summary

Constructors

Constructor	Description
HollowTrieDistributorMonotoneMinimalPerfectHashFunction(Iterable<? extends T> elements, TransformationStrategy<? super T> transform)	Creates a new hollow-trie-based monotone minimal perfect hash function using the given elements and transformation strategy, using the default temporary directory.
HollowTrieDistributorMonotoneMinimalPerfectHashFunction(Iterable<? extends T> elements, TransformationStrategy<? super T> transform, File tempDir)	Creates a new hollow-trie-based monotone minimal perfect hash function using the given elements, transformation strategy, and temporary directory.

Method Summary

Modifier and Type	Method	Description
long	getLong(Object o)
static void	main(String[] arg)
long	numBits()
long	size64()

Methods inherited from class it.unimi.dsi.sux4j.mph.AbstractHashFunction

containsKey, size

Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractObject2LongFunction

defaultReturnValue, defaultReturnValue

Methods inherited from class java.lang.Object

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

Methods inherited from interface it.unimi.dsi.fastutil.Function

apply, clear

Methods inherited from interface java.util.function.Function

compose

Methods inherited from interface it.unimi.dsi.fastutil.objects.Object2LongFunction

andThen, andThenByte, andThenChar, andThenDouble, andThenFloat, andThenInt, andThenLong, andThenObject, andThenReference, andThenShort, applyAsLong, composeByte, composeChar, composeDouble, composeFloat, composeInt, composeLong, composeObject, composeReference, composeShort, get, getOrDefault, getOrDefault, put, put, remove, removeLong

Methods inherited from interface it.unimi.dsi.fastutil.Size64

size

Field Details

serialVersionUID

public static final long serialVersionUID

See Also:

• Constant Field Values

Constructor Details

HollowTrieDistributorMonotoneMinimalPerfectHashFunction

public HollowTrieDistributorMonotoneMinimalPerfectHashFunction(Iterable<? extends T> elements,
 TransformationStrategy<? super T> transform)
                                                        throws IOException

Creates a new hollow-trie-based monotone minimal perfect hash function using the given elements and transformation strategy, using the default temporary directory.

Parameters:

elements - the elements among which the trie must be able to rank.

transform - a transformation strategy that must turn the elements in elements into a list of distinct, prefix-free, lexicographically increasing (in iteration order) bit vectors.

Throws:

IOException

HollowTrieDistributorMonotoneMinimalPerfectHashFunction

public HollowTrieDistributorMonotoneMinimalPerfectHashFunction(Iterable<? extends T> elements,
 TransformationStrategy<? super T> transform,
 File tempDir)
                                                        throws IOException

Creates a new hollow-trie-based monotone minimal perfect hash function using the given elements, transformation strategy, and temporary directory.

Parameters:

elements - the elements among which the trie must be able to rank.

transform - a transformation strategy that must turn the elements in elements into a list of distinct, prefix-free, lexicographically increasing (in iteration order) bit vectors.

tempDir - a directory for the temporary files created during construction by the HollowTrieDistributor, or null for the default temporary directory.

Throws:

IOException

Method Details

getLong

public long getLong(Object o)

Specified by:

getLong in interface Object2LongFunction<T>

size64

public long size64()

Specified by:

size64 in interface Size64

Overrides:

size64 in class AbstractHashFunction<T>

numBits

public long numBits()

main

public static void main(String[] arg)
                 throws NoSuchMethodException,
IOException,
JSAPException

Throws:

NoSuchMethodException

IOException

JSAPException