Package it.unimi.dsi.sux4j.mph

Class HollowTrieMonotoneMinimalPerfectHashFunction<T>

java.lang.Object

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

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

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

All Implemented Interfaces:

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

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

A hollow trie, that is, a compacted trie recording just the length of the paths associated to the internal nodes.

Instances of this class can be used to compute a monotone minimal perfect hashing of the keys.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected JacobsonBalancedParentheses	balParen	A balanced parentheses structure over trie.
protected EliasFanoLongBigList	skips
protected final LongArrayBitVector	trie	The bit vector containing Jacobson's representation of the trie.

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

defRetValue

Constructor Summary

Constructors

Constructor	Description
HollowTrieMonotoneMinimalPerfectHashFunction(Iterable<? extends T> iterable, TransformationStrategy<? super T> transform)
HollowTrieMonotoneMinimalPerfectHashFunction(Iterator<? extends T> iterator, TransformationStrategy<? super T> transform)

Method Summary

Modifier and Type	Method	Description
long	getLong(Object object)
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

skips

protected EliasFanoLongBigList skips

trie

protected final LongArrayBitVector trie

The bit vector containing Jacobson's representation of the trie.

balParen

protected JacobsonBalancedParentheses balParen

A balanced parentheses structure over trie.

Constructor Details

HollowTrieMonotoneMinimalPerfectHashFunction

public HollowTrieMonotoneMinimalPerfectHashFunction(Iterable<? extends T> iterable,
 TransformationStrategy<? super T> transform)

HollowTrieMonotoneMinimalPerfectHashFunction

public HollowTrieMonotoneMinimalPerfectHashFunction(Iterator<? extends T> iterator,
 TransformationStrategy<? super T> transform)

Method Details

getLong

public long getLong(Object object)

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