org.openimaj.lsh.composition

Class PolyHashComposition<OBJECT>

java.lang.Object

org.openimaj.util.hash.composition.HashComposition<OBJECT>

org.openimaj.lsh.composition.PolyHashComposition<OBJECT>

Type Parameters:

OBJECT - Object being hashed

All Implemented Interfaces:

HashFunction<OBJECT>

public class PolyHashComposition<OBJECT>
extends HashComposition<OBJECT>

HashComposition that uses a polynomial function to combine the individual hashes. Based on the composition in the Caltech Large Scale Image Search Toolbox.

Author:

Jonathon Hare (jsh2@ecs.soton.ac.uk)

Field Summary

Fields inherited from class org.openimaj.util.hash.composition.HashComposition

hashFunctions

Constructor Summary

Constructors

Constructor and Description
PolyHashComposition(HashFunction<OBJECT> first, HashFunction<OBJECT>... remainder) Construct with the given functions.
PolyHashComposition(HashFunctionFactory<OBJECT> factory, int nFuncs) Construct with the factory which is used to produce the required number of functions.
PolyHashComposition(List<HashFunction<OBJECT>> functions) Construct with the given functions.

Method Summary

Modifier and Type	Method and Description
int	computeHashCode(OBJECT object) Compute the hash code for the object

Methods inherited from class java.lang.Object

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

Constructor Detail

PolyHashComposition

public PolyHashComposition(List<HashFunction<OBJECT>> functions)

Construct with the given functions.

Parameters:

functions - the underlying hash functions.

PolyHashComposition

@SafeVarargs
public PolyHashComposition(HashFunction<OBJECT> first,
                                        HashFunction<OBJECT>... remainder)

Construct with the given functions.

Parameters:

first - the first function

remainder - the remainder of the functions

PolyHashComposition

public PolyHashComposition(HashFunctionFactory<OBJECT> factory,
                           int nFuncs)

Construct with the factory which is used to produce the required number of functions.

Parameters:

factory - the factory to use to produce the underlying hash functions.

nFuncs - the number of functions to create for the composition

Method Detail

computeHashCode

public int computeHashCode(OBJECT object)

Description copied from interface: HashFunction

Compute the hash code for the object

Parameters:

object - the object

Returns:

the hash code