gnu.trove

Class THashMap

java.lang.Object

gnu.trove.THash

gnu.trove.TObjectHash

gnu.trove.THashMap

All Implemented Interfaces:

TObjectHashingStrategy, java.io.Serializable, java.lang.Cloneable, java.util.Map

public class THashMap
extends TObjectHash
implements java.util.Map, java.io.Serializable

An implementation of the Map interface which uses an open addressed hash table to store its contents. Created: Sun Nov 4 08:52:45 2001

Version:

$Id: THashMap.java,v 1.15 2003/03/23 04:06:59 ericdf Exp $

Author:

Eric D. Friedman

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
(package private) class	THashMap.Entry
protected class	THashMap.EntryView a view onto the entries of the map.
private static class	THashMap.EqProcedure
private class	THashMap.HashProcedure
protected class	THashMap.KeyView a view onto the keys of the map.
protected class	THashMap.ValueView a view onto the values of the map.

Field Summary

Fields

Modifier and Type	Field and Description
protected java.lang.Object[]	_values the values of the map

Fields inherited from class gnu.trove.TObjectHash

_hashingStrategy, _set, REMOVED

Fields inherited from class gnu.trove.THash

_free, _loadFactor, _maxSize, _size, DEFAULT_INITIAL_CAPACITY, DEFAULT_LOAD_FACTOR

Constructor Summary

Constructors

Constructor and Description
THashMap() Creates a new THashMap instance with the default capacity and load factor.
THashMap(int initialCapacity) Creates a new THashMap instance with a prime capacity equal to or greater than initialCapacity and with the default load factor.
THashMap(int initialCapacity, float loadFactor) Creates a new THashMap instance with a prime capacity equal to or greater than initialCapacity and with the specified load factor.
THashMap(int initialCapacity, float loadFactor, TObjectHashingStrategy strategy) Creates a new THashMap instance with a prime capacity equal to or greater than initialCapacity and with the specified load factor.
THashMap(int initialCapacity, TObjectHashingStrategy strategy) Creates a new THashMap instance with a prime capacity equal to or greater than initialCapacity and with the default load factor.
THashMap(java.util.Map map) Creates a new THashMap instance which contains the key/value pairs in map.
THashMap(java.util.Map map, TObjectHashingStrategy strategy) Creates a new THashMap instance which contains the key/value pairs in map.
THashMap(TObjectHashingStrategy strategy) Creates a new THashMap instance with the default capacity and load factor.

Method Summary

Methods

Modifier and Type	Method and Description
void	clear() Empties the map.
java.lang.Object	clone()
boolean	containsKey(java.lang.Object key) checks for the present of key in the keys of the map.
boolean	containsValue(java.lang.Object val) checks for the presence of val in the values of the map.
java.util.Set	entrySet() Returns a Set view on the entries of the map.
boolean	equals(java.lang.Object other) Compares this map with another map for equality of their stored entries.
boolean	forEachEntry(TObjectObjectProcedure procedure) Executes procedure for each key/value entry in the map.
boolean	forEachKey(TObjectProcedure procedure) Executes procedure for each key in the map.
boolean	forEachValue(TObjectProcedure procedure) Executes procedure for each value in the map.
java.lang.Object	get(java.lang.Object key) retrieves the value for key
int	hashCode()
java.util.Set	keySet() returns a Set view on the keys of the map.
java.lang.Object	put(java.lang.Object key, java.lang.Object value) Inserts a key/value pair into the map.
void	putAll(java.util.Map map) copies the key/value mappings in map into this map.
private void	readObject(java.io.ObjectInputStream stream)
protected void	rehash(int newCapacity) rehashes the map to the new capacity.
java.lang.Object	remove(java.lang.Object key) Deletes a key/value pair from the map.
protected void	removeAt(int index) removes the mapping at index from the map.
boolean	retainEntries(TObjectObjectProcedure procedure) Retains only those entries in the map for which the procedure returns a true value.
protected int	setUp(int initialCapacity) initialize the value array of the map.
void	transformValues(TObjectFunction function) Transform the values in this map using function.
java.util.Collection	values() Returns a view on the values of the map.
private void	writeObject(java.io.ObjectOutputStream stream)

Methods inherited from class gnu.trove.TObjectHash

capacity, computeHashCode, contains, equals, forEach, index, insertionIndex, throwObjectContractViolation

Methods inherited from class gnu.trove.THash

compact, ensureCapacity, isEmpty, postInsertHook, size, trimToSize

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Map

isEmpty, size

Field Detail

_values

protected transient java.lang.Object[] _values

the values of the map

Constructor Detail

THashMap

public THashMap()

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

THashMap

public THashMap(TObjectHashingStrategy strategy)

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

Parameters:

strategy - used to compute hash codes and to compare objects.

THashMap

public THashMap(int initialCapacity)

Creates a new THashMap instance with a prime capacity equal to or greater than initialCapacity and with the default load factor.

Parameters:

initialCapacity - an int value

THashMap

public THashMap(int initialCapacity,
        TObjectHashingStrategy strategy)

Creates a new THashMap instance with a prime capacity equal to or greater than initialCapacity and with the default load factor.

Parameters:

initialCapacity - an int value

strategy - used to compute hash codes and to compare objects.

THashMap

public THashMap(int initialCapacity,
        float loadFactor)

Creates a new THashMap 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

THashMap

public THashMap(int initialCapacity,
        float loadFactor,
        TObjectHashingStrategy strategy)

Creates a new THashMap 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

strategy - used to compute hash codes and to compare objects.

THashMap

public THashMap(java.util.Map map)

Creates a new THashMap instance which contains the key/value pairs in map.

Parameters:

map - a Map value

THashMap

public THashMap(java.util.Map map,
        TObjectHashingStrategy strategy)

Creates a new THashMap instance which contains the key/value pairs in map.

Parameters:

map - a Map value

strategy - used to compute hash codes and to compare objects.

Method Detail

clone

public java.lang.Object clone()

Overrides:

clone in class TObjectHash

Returns:

a shallow clone of this collection

setUp

protected int setUp(int initialCapacity)

initialize the value array of the map.

Overrides:

setUp in class TObjectHash

Parameters:

initialCapacity - an int value

Returns:

an int value

put

public java.lang.Object put(java.lang.Object key,
                   java.lang.Object value)

Inserts a key/value pair into the map.

Specified by:

put in interface java.util.Map

Parameters:

key - an Object value

value - an Object value

Returns:

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

equals

public boolean equals(java.lang.Object other)

Compares this map with another map for equality of their stored entries.

Specified by:

equals in interface java.util.Map

Overrides:

equals in class java.lang.Object

Parameters:

other - an Object value

Returns:

a boolean value

hashCode

public int hashCode()

Specified by:

hashCode in interface java.util.Map

Overrides:

hashCode in class java.lang.Object

forEachKey

public boolean forEachKey(TObjectProcedure procedure)

Executes procedure for each key in the map.

Parameters:

procedure - a TObjectProcedure 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.

forEachEntry

public boolean forEachEntry(TObjectObjectProcedure procedure)

Executes procedure for each key/value entry in the map.

Parameters:

procedure - a TObjectObjectProcedure value

Returns:

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

retainEntries

public boolean retainEntries(TObjectObjectProcedure 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.

transformValues

public void transformValues(TObjectFunction function)

Transform the values in this map using function.

Parameters:

function - a TObjectFunction value

rehash

protected void rehash(int newCapacity)

rehashes the map to the new capacity.

Specified by:

rehash in class THash

Parameters:

newCapacity - an int value

get

public java.lang.Object get(java.lang.Object key)

retrieves the value for key

Specified by:

get in interface java.util.Map

Parameters:

key - an Object value

Returns:

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

clear

public void clear()

Empties the map.

Specified by:

clear in interface java.util.Map

Overrides:

clear in class THash

remove

public java.lang.Object remove(java.lang.Object key)

Deletes a key/value pair from the map.

Specified by:

remove in interface java.util.Map

Parameters:

key - an Object value

Returns:

an Object value

removeAt

protected void removeAt(int index)

removes the mapping at index from the map.

Overrides:

removeAt in class TObjectHash

Parameters:

index - an int value

values

public java.util.Collection values()

Returns a view on the values of the map.

Specified by:

values in interface java.util.Map

Returns:

a Collection value

keySet

public java.util.Set keySet()

returns a Set view on the keys of the map.

Specified by:

keySet in interface java.util.Map

Returns:

a Set value

entrySet

public java.util.Set entrySet()

Returns a Set view on the entries of the map.

Specified by:

entrySet in interface java.util.Map

Returns:

a Set value

containsValue

public boolean containsValue(java.lang.Object val)

checks for the presence of val in the values of the map.

Specified by:

containsValue in interface java.util.Map

Parameters:

val - an Object value

Returns:

a boolean value

containsKey

public boolean containsKey(java.lang.Object key)

checks for the present of key in the keys of the map.

Specified by:

containsKey in interface java.util.Map

Parameters:

key - an Object value

Returns:

a boolean value

putAll

public void putAll(java.util.Map map)

copies the key/value mappings in map into this map.

Specified by:

putAll in interface java.util.Map

Parameters:

map - a Map value

writeObject

private void writeObject(java.io.ObjectOutputStream stream)
                  throws java.io.IOException

Throws:

java.io.IOException

readObject

private void readObject(java.io.ObjectInputStream stream)
                 throws java.io.IOException,
                        java.lang.ClassNotFoundException

Throws:

java.io.IOException

java.lang.ClassNotFoundException