gnu.trove.impl.hash
Class TIntFloatHash

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

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable

Direct Known Subclasses:

TIntFloatHashMap

public abstract class TIntFloatHash
extends TPrimitiveHash

An open addressed hashing implementation for int/float primitive entries. Created: Sun Nov 4 08:56:06 2001

Version:

$Id: _K__V_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_key key that represents null NOTE: should not be modified after the Hash is created, but is not final because of Externalization
protected float	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

TIntFloatHash()
Creates a new T#E#Hash instance with the default capacity and load factor.

TIntFloatHash(int initialCapacity)
Creates a new T#E#Hash instance whose capacity is the next highest prime above initialCapacity + 1 unless that value is already prime.

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

TIntFloatHash(int initialCapacity, float loadFactor, int no_entry_key, float no_entry_value)
Creates a new TIntFloatHash 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 key in the map.
int	getNoEntryKey() Returns the value that is used to represent null as a key.
float	getNoEntryValue() Returns the value that is used to represent null.
protected int	index(int key) Locates the index of val.
protected int	insertionIndex(int key) Locates the index at which val can be inserted.
void	readExternal(java.io.ObjectInput in)
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.
void	writeExternal(java.io.ObjectOutput out)

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, reenableAutoCompaction, rehash, setAutoCompactionFactor, size, tempDisableAutoCompaction, trimToSize

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_key

protected int no_entry_key

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

no_entry_value

protected float 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

TIntFloatHash

public TIntFloatHash()

Creates a new T#E#Hash instance with the default capacity and load factor.

TIntFloatHash

public TIntFloatHash(int initialCapacity)

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

Parameters:

initialCapacity - an int value

TIntFloatHash

public TIntFloatHash(int initialCapacity,
                     float loadFactor)

Creates a new TIntFloatHash 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.

TIntFloatHash

public TIntFloatHash(int initialCapacity,
                     float loadFactor,
                     int no_entry_key,
                     float no_entry_value)

Creates a new TIntFloatHash 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

getNoEntryKey

public int getNoEntryKey()

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

Returns:

the value that represents null

getNoEntryValue

public float 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 key in the map.

Parameters:

procedure - a TIntProcedure 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 key)

Locates the index of val.

Parameters:

key - an int value

Returns:

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

insertionIndex

protected int insertionIndex(int key)

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:

key - an int value

Returns:

an int value

writeExternal

public void writeExternal(java.io.ObjectOutput out)
                   throws java.io.IOException

Specified by:

writeExternal in interface java.io.Externalizable

Overrides:

writeExternal in class THash

Throws:

java.io.IOException

readExternal

public void readExternal(java.io.ObjectInput in)
                  throws java.io.IOException,
                         java.lang.ClassNotFoundException

Specified by:

readExternal in interface java.io.Externalizable

Overrides:

readExternal in class THash

Throws:

java.io.IOException

java.lang.ClassNotFoundException