gnu.trove.impl.hash
Class TIntHash

java.lang.Object
  gnu.trove.impl.hash.THash
      gnu.trove.impl.hash.TPrimitiveHash
          gnu.trove.impl.hash.TIntHash

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable

Direct Known Subclasses:

TIntHashSet

public abstract class TIntHash
extends TPrimitiveHash

An open addressed hashing implementation for int primitives. Created: Sun Nov 4 08:56:06 2001

Version:

$Id: _E_Hash.template,v 1.1.2.6 2009/11/07 03:36:44 robeden Exp $

Author:

Eric D. Friedman, Rob Eden, Jeff Randall

See Also:

Serialized Form

Field Summary

int[]	_set the set of ints
protected int	no_entry_value value that represents null NOTE: should not be modified after the Hash is created, but is not final because of Externalization

Fields inherited from class gnu.trove.impl.hash.TPrimitiveHash

_states, FREE, FULL, REMOVED

Fields inherited from class gnu.trove.impl.hash.THash

_autoCompactionFactor, _autoCompactRemovesRemaining, _autoCompactTemporaryDisable, _free, _loadFactor, _maxSize, _size, DEFAULT_CAPACITY, DEFAULT_LOAD_FACTOR

Constructor Summary

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

TIntHash(int initialCapacity)
Creates a new TIntHash instance whose capacity is the next highest prime above initialCapacity + 1 unless that value is already prime.

TIntHash(int initialCapacity, float loadFactor)
Creates a new TIntHash instance with a prime value at or near the specified capacity and load factor.

TIntHash(int initialCapacity, float loadFactor, int no_entry_value)
Creates a new TIntHash instance with a prime value at or near the specified capacity and load factor.

Method Summary

boolean	contains(int val) Searches the set for val
boolean	forEach(TIntProcedure procedure) Executes procedure for each element in the set.
int	getNoEntryValue() Returns the value that is used to represent null.
protected int	index(int val) Locates the index of val.
protected int	insertionIndex(int 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.

Methods inherited from class gnu.trove.impl.hash.TPrimitiveHash

capacity

Methods inherited from class gnu.trove.impl.hash.THash

calculateGrownCapacity, clear, compact, computeMaxSize, computeNextAutoCompactionAmount, ensureCapacity, getAutoCompactionFactor, isEmpty, postInsertHook, readExternal, reenableAutoCompaction, rehash, setAutoCompactionFactor, size, tempDisableAutoCompaction, trimToSize, writeExternal

Methods inherited from class java.lang.Object

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

Field Detail

_set

public transient int[] _set

the set of ints

no_entry_value

protected int no_entry_value

value that represents null NOTE: should not be modified after the Hash is created, but is not final because of Externalization

Constructor Detail

TIntHash

public TIntHash()

Creates a new TIntHash instance with the default capacity and load factor.

TIntHash

public TIntHash(int initialCapacity)

Creates a new TIntHash instance whose capacity is the next highest prime above initialCapacity + 1 unless that value is already prime.

Parameters:

initialCapacity - an int value

TIntHash

public TIntHash(int initialCapacity,
                float loadFactor)

Creates a new TIntHash 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.

TIntHash

public TIntHash(int initialCapacity,
                float loadFactor,
                int no_entry_value)

Creates a new TIntHash 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.

no_entry_value - value that represents null

Method Detail

getNoEntryValue

public int getNoEntryValue()

Returns the value that is used to represent null. The default value is generally zero, but can be changed during construction of the collection.

Returns:

the value that represents null

setUp

protected int setUp(int initialCapacity)

initializes the hashtable to a prime capacity which is at least initialCapacity + 1.

Overrides:

setUp in class TPrimitiveHash

Parameters:

initialCapacity - an int value

Returns:

the actual capacity chosen

contains

public boolean contains(int val)

Searches the set for val

Parameters:

val - an int value

Returns:

a boolean value

forEach

public boolean forEach(TIntProcedure 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.

removeAt

protected void removeAt(int index)

Releases the element currently stored at index.

Overrides:

removeAt in class TPrimitiveHash

Parameters:

index - an int value

index

protected int index(int val)

Locates the index of val.

Parameters:

val - an int value

Returns:

the index of val or -1 if it isn't in the set.

insertionIndex

protected int insertionIndex(int 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 int value

Returns:

an int value