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>, Serializable

public class HollowTrieDistributorMonotoneMinimalPerfectHashFunction<T>
extends AbstractHashFunction<T>
implements 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

static long

serialVersionUID

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

defRetValue

Constructor Summary

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

long	getLong(Object o)
static void	main(String[] arg)
long	numBits()
int	size()

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

containsKey

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

clear, defaultReturnValue, defaultReturnValue, get, put, put, remove, removeLong

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

public static final long serialVersionUID

See Also:

Constant Field Values

Constructor Detail

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 Detail

getLong

public long getLong(Object o)

Specified by:

getLong in interface Object2LongFunction<T>

size

public int size()

Specified by:

size in interface Function<T,Long>

Overrides:

size in class AbstractHashFunction<T>

numBits

public long numBits()

main

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

Throws:

NoSuchMethodException

IOException

JSAPException