gnu.trove

Class TFloatHash

Implemented Interfaces:
TFloatHashingStrategy

public abstract class TFloatHash
extends TPrimitiveHash
implements TFloatHashingStrategy

An open addressed hashing implementation for float primitives. Created: Sun Nov 4 08:56:06 2001
Version:
$Id: PHash.template,v 1.2 2007/06/29 22:39:46 robeden Exp $
Author:
Eric D. Friedman

Field Summary

protected TFloatHashingStrategy
_hashingStrategy
strategy used to hash values in this collection
protected float[]
_set
the set of floats

Constructor Summary

TFloatHash()
Creates a new TFloatHash instance with the default capacity and load factor.
TFloatHash(TFloatHashingStrategy strategy)
Creates a new TFloatHash instance with the default capacity and load factor.
TFloatHash(int initialCapacity)
Creates a new TFloatHash instance whose capacity is the next highest prime above initialCapacity + 1 unless that value is already prime.
TFloatHash(int initialCapacity, TFloatHashingStrategy strategy)
Creates a new TFloatHash instance whose capacity is the next highest prime above initialCapacity + 1 unless that value is already prime.
TFloatHash(int initialCapacity, float loadFactor)
Creates a new TFloatHash instance with a prime value at or near the specified capacity and load factor.
TFloatHash(int initialCapacity, float loadFactor, TFloatHashingStrategy strategy)
Creates a new TFloatHash instance with a prime value at or near the specified capacity and load factor.

Method Summary

Object
clone()
int
computeHashCode(float val)
Default implementation of TFloatHashingStrategy: delegates hashing to HashFunctions.hash(float).
boolean
contains(float val)
Searches the set for val
boolean
forEach(TFloatProcedure procedure)
Executes procedure for each element in the set.
protected int
index(float val)
Locates the index of val.
protected int
insertionIndex(float val)
Locates the index at which val can be inserted.
protected void
removeAt(int index)
Releases the element currently stored at index.
protected int
setUp(int initialCapacity)
initializes the hashtable to a prime capacity which is at least initialCapacity + 1.

Field Details

_hashingStrategy

protected TFloatHashingStrategy _hashingStrategy
strategy used to hash values in this collection

_set

protected float[] _set
the set of floats

Constructor Details

TFloatHash

public TFloatHash()
Creates a new TFloatHash instance with the default capacity and load factor.

TFloatHash

public TFloatHash(TFloatHashingStrategy strategy)
Creates a new TFloatHash instance with the default capacity and load factor.
Parameters:
strategy - used to compute hash codes and to compare keys.

TFloatHash

public TFloatHash(int initialCapacity)
Creates a new TFloatHash instance whose capacity is the next highest prime above initialCapacity + 1 unless that value is already prime.
Parameters:
initialCapacity - an int value

TFloatHash

public TFloatHash(int initialCapacity,
                  TFloatHashingStrategy strategy)
Creates a new TFloatHash instance whose capacity is the next highest prime above initialCapacity + 1 unless that value is already prime.
Parameters:
initialCapacity - an int value
strategy - used to compute hash codes and to compare keys.

TFloatHash

public TFloatHash(int initialCapacity,
                  float loadFactor)
Creates a new TFloatHash instance with a prime value at or near the specified capacity and load factor.
Parameters:
initialCapacity - used to find a prime capacity for the table.
loadFactor - used to calculate the threshold over which rehashing takes place.

TFloatHash

public TFloatHash(int initialCapacity,
                  float loadFactor,
                  TFloatHashingStrategy strategy)
Creates a new TFloatHash instance with a prime value at or near the specified capacity and load factor.
Parameters:
initialCapacity - used to find a prime capacity for the table.
loadFactor - used to calculate the threshold over which rehashing takes place.
strategy - used to compute hash codes and to compare keys.

Method Details

clone

public Object clone()
Returns:
a deep clone of this collection

computeHashCode

public final int computeHashCode(float val)
Default implementation of TFloatHashingStrategy: delegates hashing to HashFunctions.hash(float).
Parameters:
val - the value to hash
Returns:
the hashcode.

contains

public boolean contains(float val)
Searches the set for val
Parameters:
val - an float value
Returns:
a boolean value

forEach

public boolean forEach(TFloatProcedure procedure)
Executes procedure for each element in the set.
Parameters:
procedure - a TObjectProcedure value
Returns:
false if the loop over the set terminated because the procedure returned false for some value.

index

protected int index(float val)
Locates the index of val.
Parameters:
val - an float value
Returns:
the index of val or -1 if it isn't in the set.

insertionIndex

protected int insertionIndex(float val)
Locates the index at which val can be inserted. if there is already a value equal()ing val in the set, returns that value as a negative integer.
Parameters:
val - an float value
Returns:
an int value

removeAt

protected void removeAt(int index)
Releases the element currently stored at index.
Parameters:
index - an int value

setUp

protected int setUp(int initialCapacity)
initializes the hashtable to a prime capacity which is at least initialCapacity + 1.
Parameters:
initialCapacity - an int value
Returns:
the actual capacity chosen

GNU Trove is copyright B) 2001-2008 Eric D. Friedman. All Rights Reserved.