gnu.trove

Class TDoubleObjectHashMap

public class TDoubleObjectHashMap extends TDoubleHash implements Serializable

An open addressed Map implementation for double keys and Object values. Created: Sun Nov 4 08:52:45 2001

Version: $Id: TDoubleObjectHashMap.java,v 1.14 2003/03/19 04:17:03 ericdf Exp $

Author: Eric D. Friedman

Nested Class Summary
static classTDoubleObjectHashMap.EqProcedure
classTDoubleObjectHashMap.HashProcedure
Field Summary
protected Object[]_values
the values of the map
Constructor Summary
TDoubleObjectHashMap()
Creates a new TDoubleObjectHashMap instance with the default capacity and load factor.
TDoubleObjectHashMap(int initialCapacity)
Creates a new TDoubleObjectHashMap instance with a prime capacity equal to or greater than initialCapacity and with the default load factor.
TDoubleObjectHashMap(int initialCapacity, float loadFactor)
Creates a new TDoubleObjectHashMap instance with a prime capacity equal to or greater than initialCapacity and with the specified load factor.
TDoubleObjectHashMap(TDoubleHashingStrategy strategy)
Creates a new TDoubleObjectHashMap instance with the default capacity and load factor.
TDoubleObjectHashMap(int initialCapacity, TDoubleHashingStrategy strategy)
Creates a new TDoubleObjectHashMap instance whose capacity is the next highest prime above initialCapacity + 1 unless that value is already prime.
TDoubleObjectHashMap(int initialCapacity, float loadFactor, TDoubleHashingStrategy strategy)
Creates a new TDoubleObjectHashMap instance with a prime value at or near the specified capacity and load factor.
Method Summary
voidclear()
Empties the map.
Objectclone()
booleancontainsKey(double key)
checks for the present of key in the keys of the map.
booleancontainsValue(Object val)
checks for the presence of val in the values of the map.
booleanequals(Object other)
Compares this map with another map for equality of their stored entries.
booleanforEachEntry(TDoubleObjectProcedure procedure)
Executes procedure for each key/value entry in the map.
booleanforEachKey(TDoubleProcedure procedure)
Executes procedure for each key in the map.
booleanforEachValue(TObjectProcedure procedure)
Executes procedure for each value in the map.
Objectget(double key)
retrieves the value for key
Object[]getValues()
Returns the values of the map.
inthashCode()
TDoubleObjectIteratoriterator()
double[]keys()
returns the keys of the map.
Objectput(double key, Object value)
Inserts a key/value pair into the map.
voidreadObject(ObjectInputStream stream)
protected voidrehash(int newCapacity)
rehashes the map to the new capacity.
Objectremove(double key)
Deletes a key/value pair from the map.
protected voidremoveAt(int index)
removes the mapping at index from the map.
booleanretainEntries(TDoubleObjectProcedure procedure)
Retains only those entries in the map for which the procedure returns a true value.
protected intsetUp(int initialCapacity)
initializes the hashtable to a prime capacity which is at least initialCapacity + 1.
voidtransformValues(TObjectFunction function)
Transform the values in this map using function.
voidwriteObject(ObjectOutputStream stream)

Field Detail

_values

protected transient Object[] _values
the values of the map

Constructor Detail

TDoubleObjectHashMap

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

TDoubleObjectHashMap

public TDoubleObjectHashMap(int initialCapacity)
Creates a new TDoubleObjectHashMap instance with a prime capacity equal to or greater than initialCapacity and with the default load factor.

Parameters: initialCapacity an int value

TDoubleObjectHashMap

public TDoubleObjectHashMap(int initialCapacity, float loadFactor)
Creates a new TDoubleObjectHashMap instance with a prime capacity equal to or greater than initialCapacity and with the specified load factor.

Parameters: initialCapacity an int value loadFactor a float value

TDoubleObjectHashMap

public TDoubleObjectHashMap(TDoubleHashingStrategy strategy)
Creates a new TDoubleObjectHashMap instance with the default capacity and load factor.

Parameters: strategy used to compute hash codes and to compare keys.

TDoubleObjectHashMap

public TDoubleObjectHashMap(int initialCapacity, TDoubleHashingStrategy strategy)
Creates a new TDoubleObjectHashMap 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.

TDoubleObjectHashMap

public TDoubleObjectHashMap(int initialCapacity, float loadFactor, TDoubleHashingStrategy strategy)
Creates a new TDoubleObjectHashMap 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 Detail

clear

public void clear()
Empties the map.

clone

public Object clone()

Returns: a deep clone of this collection

containsKey

public boolean containsKey(double key)
checks for the present of key in the keys of the map.

Parameters: key an double value

Returns: a boolean value

containsValue

public boolean containsValue(Object val)
checks for the presence of val in the values of the map.

Parameters: val an Object value

Returns: a boolean value

equals

public boolean equals(Object other)
Compares this map with another map for equality of their stored entries.

Parameters: other an Object value

Returns: a boolean value

forEachEntry

public boolean forEachEntry(TDoubleObjectProcedure procedure)
Executes procedure for each key/value entry in the map.

Parameters: procedure a TODoubleObjectProcedure value

Returns: false if the loop over the entries terminated because the procedure returned false for some entry.

forEachKey

public boolean forEachKey(TDoubleProcedure procedure)
Executes procedure for each key in the map.

Parameters: procedure a TDoubleProcedure value

Returns: false if the loop over the keys terminated because the procedure returned false for some key.

forEachValue

public boolean forEachValue(TObjectProcedure procedure)
Executes procedure for each value in the map.

Parameters: procedure a TObjectProcedure value

Returns: false if the loop over the values terminated because the procedure returned false for some value.

get

public Object get(double key)
retrieves the value for key

Parameters: key an double value

Returns: the value of key or null if no such mapping exists.

getValues

public Object[] getValues()
Returns the values of the map.

Returns: a Collection value

hashCode

public int hashCode()

iterator

public TDoubleObjectIterator iterator()

Returns: a TDoubleObjectIterator with access to this map's keys and values

keys

public double[] keys()
returns the keys of the map.

Returns: a Set value

put

public Object put(double key, Object value)
Inserts a key/value pair into the map.

Parameters: key an double value value an Object value

Returns: the previous value associated with key, or null if none was found.

readObject

private void readObject(ObjectInputStream stream)

rehash

protected void rehash(int newCapacity)
rehashes the map to the new capacity.

Parameters: newCapacity an int value

remove

public Object remove(double key)
Deletes a key/value pair from the map.

Parameters: key an double value

Returns: an Object value

removeAt

protected void removeAt(int index)
removes the mapping at index from the map.

Parameters: index an int value

retainEntries

public boolean retainEntries(TDoubleObjectProcedure procedure)
Retains only those entries in the map for which the procedure returns a true value.

Parameters: procedure determines which entries to keep

Returns: true if the map was modified.

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

transformValues

public void transformValues(TObjectFunction function)
Transform the values in this map using function.

Parameters: function a TObjectFunction value

writeObject

private void writeObject(ObjectOutputStream stream)