bak.pcj.map
Class ObjectKeyByteOpenHashMap

java.lang.Object
  bak.pcj.map.AbstractObjectKeyByteMap
      bak.pcj.map.ObjectKeyByteOpenHashMap

All Implemented Interfaces:

Cloneable, ObjectKeyByteMap, Serializable

public class ObjectKeyByteOpenHashMap

extends AbstractObjectKeyByteMap

implements ObjectKeyByteMap, Cloneable, Serializable

This class represents open addressing hash table based maps from object values to byte values.

Since:

1.1

See Also:

ObjectKeyByteChainedHashMap, Map, Serialized Form

Field Summary

static int	DEFAULT_CAPACITY The default capacity of this map.
static int	DEFAULT_GROWTH_CHUNK The default chunk size with which to increase the capacity of this map.
static double	DEFAULT_GROWTH_FACTOR The default factor with which to increase the capacity of this map.
static double	DEFAULT_LOAD_FACTOR The default load factor of this map.

Constructor Summary

ObjectKeyByteOpenHashMap()
Creates a new hash map with capacity 11, a relative growth factor of 1.0, and a load factor of 75%.

ObjectKeyByteOpenHashMap(double loadFactor)
Creates a new hash map with a capacity of 11, a relative growth factor of 1.0, and a specified load factor.

ObjectKeyByteOpenHashMap(int capacity)
Creates a new hash map with a specified capacity, a relative growth factor of 1.0, and a load factor of 75%.

ObjectKeyByteOpenHashMap(int capacity, double loadFactor)
Creates a new hash map with a specified capacity and load factor, and a relative growth factor of 1.0.

ObjectKeyByteOpenHashMap(int capacity, double loadFactor, double growthFactor)
Creates a new hash map with a specified capacity, load factor, and relative growth factor.

ObjectKeyByteOpenHashMap(int capacity, double loadFactor, int growthChunk)
Creates a new hash map with a specified capacity, load factor, and absolute growth factor.

ObjectKeyByteOpenHashMap(ObjectKeyByteMap map)
Creates a new hash map with the same mappings as a specified map.

Method Summary

void	clear() Clears this map.
Object	clone() Returns a clone of this hash map.
boolean	containsKey(Object key) Indicates whether this map contains a mapping from a specified key.
boolean	containsValue(byte value) Indicates whether this map contains a mapping to a specified value.
ObjectKeyByteMapIterator	entries() Returns an iterator over the entries of this map.
byte	get(Object key) Maps a specified key to a value.
boolean	isEmpty() Indicates whether this map is empty.
Set	keySet() Returns a set view of the keys of this map.
byte	lget() Returns the last value corresponding to a positive result from containsKey(Object).
byte	put(Object key, byte value) Adds a mapping from a specified key to a specified value to this map.
byte	remove(Object key) Removes the mapping from a specified key from this map.
int	size() Returns the size of this map.
byte	tget(Object key) Maps a specified key to a value.
ByteCollection	values() Returns a collection view of the values in this map.

Methods inherited from class bak.pcj.map.AbstractObjectKeyByteMap

equals, hashCode, putAll, toString, trimToSize

Methods inherited from class java.lang.Object

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

Methods inherited from interface bak.pcj.map.ObjectKeyByteMap

equals, hashCode, putAll, trimToSize

Field Detail

DEFAULT_GROWTH_FACTOR

public static final double DEFAULT_GROWTH_FACTOR

The default factor with which to increase the capacity of this map.

See Also:

Constant Field Values

DEFAULT_GROWTH_CHUNK

public static final int DEFAULT_GROWTH_CHUNK

The default chunk size with which to increase the capacity of this map.

See Also:

Constant Field Values

DEFAULT_CAPACITY

public static final int DEFAULT_CAPACITY

The default capacity of this map.

See Also:

Constant Field Values

DEFAULT_LOAD_FACTOR

public static final double DEFAULT_LOAD_FACTOR

The default load factor of this map.

See Also:

Constant Field Values

Constructor Detail

ObjectKeyByteOpenHashMap

public ObjectKeyByteOpenHashMap()

Creates a new hash map with capacity 11, a relative growth factor of 1.0, and a load factor of 75%.

ObjectKeyByteOpenHashMap

public ObjectKeyByteOpenHashMap(ObjectKeyByteMap map)

Creates a new hash map with the same mappings as a specified map.

Parameters:

map - the map whose mappings to put into the new map.

Throws:

NullPointerException - if map is null.

ObjectKeyByteOpenHashMap

public ObjectKeyByteOpenHashMap(int capacity)

Creates a new hash map with a specified capacity, a relative growth factor of 1.0, and a load factor of 75%.

Parameters:

capacity - the initial capacity of the map.

Throws:

IllegalArgumentException - if capacity is negative.

ObjectKeyByteOpenHashMap

public ObjectKeyByteOpenHashMap(double loadFactor)

Creates a new hash map with a capacity of 11, a relative growth factor of 1.0, and a specified load factor.

Parameters:

loadFactor - the load factor of the map.

Throws:

IllegalArgumentException - if capacity is negative; if loadFactor is not positive.

ObjectKeyByteOpenHashMap

public ObjectKeyByteOpenHashMap(int capacity,
                                double loadFactor)

Creates a new hash map with a specified capacity and load factor, and a relative growth factor of 1.0.

Parameters:

capacity - the initial capacity of the map.

loadFactor - the load factor of the map.

Throws:

IllegalArgumentException - if capacity is negative; if loadFactor is not positive.

ObjectKeyByteOpenHashMap

public ObjectKeyByteOpenHashMap(int capacity,
                                double loadFactor,
                                double growthFactor)

Creates a new hash map with a specified capacity, load factor, and relative growth factor.

The map capacity increases to capacity()*(1+growthFactor). This strategy is good for avoiding many capacity increases, but the amount of wasted memory is approximately the size of the map.

Parameters:

capacity - the initial capacity of the map.

loadFactor - the load factor of the map.

growthFactor - the relative amount with which to increase the the capacity when a capacity increase is needed.

Throws:

IllegalArgumentException - if capacity is negative; if loadFactor is not positive; if growthFactor is not positive.

ObjectKeyByteOpenHashMap

public ObjectKeyByteOpenHashMap(int capacity,
                                double loadFactor,
                                int growthChunk)

Creates a new hash map with a specified capacity, load factor, and absolute growth factor.

The map capacity increases to capacity()+growthChunk. This strategy is good for avoiding wasting memory. However, an overhead is potentially introduced by frequent capacity increases.

Parameters:

capacity - the initial capacity of the map.

loadFactor - the load factor of the map.

growthChunk - the absolute amount with which to increase the the capacity when a capacity increase is needed.

Throws:

IllegalArgumentException - if capacity is negative; if loadFactor is not positive; if growthChunk is not positive.

Method Detail

keySet

public Set keySet()

Description copied from interface: ObjectKeyByteMap

Returns a set view of the keys of this map. Removals from the returned set removes the corresponding entries in this map. Changes to the map are reflected in the set.

Specified by:

keySet in interface ObjectKeyByteMap

Returns:

a set view of the keys of this map.

lget

public byte lget()

Description copied from interface: ObjectKeyByteMap

Returns the last value corresponding to a positive result from containsKey(Object). This is useful for checking checking the existence of a mapping while avoiding two lookups on the same key.

Specified by:

lget in interface ObjectKeyByteMap

Returns:

the value corresponding to the key from the last invokation of containsKey(Object).

See Also:

ObjectKeyByteMap.get(Object), ObjectKeyByteMap.tget(Object), ObjectKeyByteMap.containsKey(Object)

put

public byte put(Object key,
                byte value)

Description copied from interface: ObjectKeyByteMap

Adds a mapping from a specified key to a specified value to this map. If a mapping already exists for the specified key it is overwritten by the new mapping.

Specified by:

put in interface ObjectKeyByteMap

Parameters:

key - the key of the mapping to add to this map.

value - the value of the mapping to add to this map.

Returns:

the old value if a mapping from the specified key already existed in this map; otherwise returns a default value as specified by the MapDefaults class.

See Also:

MapDefaults

values

public ByteCollection values()

Description copied from interface: ObjectKeyByteMap

Returns a collection view of the values in this map. The collection is not modifiable, but changes to the map are reflected in the collection.

Specified by:

values in interface ObjectKeyByteMap

Returns:

a collection view of the values in this map.

clone

public Object clone()

Returns a clone of this hash map.

Returns:

a clone of this hash map.

Since:

1.1

entries

public ObjectKeyByteMapIterator entries()

Description copied from interface: ObjectKeyByteMap

Returns an iterator over the entries of this map. It is possible to remove entries from this map using the iterator provided that the concrete map supports removal of entries.

Specified by:

entries in interface ObjectKeyByteMap

Returns:

an iterator over the entries of this map.

clear

public void clear()

Description copied from interface: ObjectKeyByteMap

Clears this map.

Specified by:

clear in interface ObjectKeyByteMap

Overrides:

clear in class AbstractObjectKeyByteMap

containsKey

public boolean containsKey(Object key)

Description copied from interface: ObjectKeyByteMap

Indicates whether this map contains a mapping from a specified key. If the key is contained in this map, a succeeding call to lget() will return the corresponding value.

Specified by:

containsKey in interface ObjectKeyByteMap

Overrides:

containsKey in class AbstractObjectKeyByteMap

containsValue

public boolean containsValue(byte value)

Description copied from interface: ObjectKeyByteMap

Indicates whether this map contains a mapping to a specified value.

Specified by:

containsValue in interface ObjectKeyByteMap

Overrides:

containsValue in class AbstractObjectKeyByteMap

get

public byte get(Object key)

Description copied from interface: ObjectKeyByteMap

Maps a specified key to a value. Returns a default value as specified by the MapDefaults class if no mapping exists for the specified key.

Specified by:

get in interface ObjectKeyByteMap

Overrides:

get in class AbstractObjectKeyByteMap

isEmpty

public boolean isEmpty()

Description copied from interface: ObjectKeyByteMap

Indicates whether this map is empty.

Specified by:

isEmpty in interface ObjectKeyByteMap

Overrides:

isEmpty in class AbstractObjectKeyByteMap

remove

public byte remove(Object key)

Description copied from interface: ObjectKeyByteMap

Removes the mapping from a specified key from this map.

Specified by:

remove in interface ObjectKeyByteMap

Overrides:

remove in class AbstractObjectKeyByteMap

size

public int size()

Description copied from interface: ObjectKeyByteMap

Returns the size of this map. The size is defined as the number of mappings from keys to values.

Specified by:

size in interface ObjectKeyByteMap

Overrides:

size in class AbstractObjectKeyByteMap

tget

public byte tget(Object key)

Description copied from interface: ObjectKeyByteMap

Maps a specified key to a value. This method should be used when the key is known to be in the map.

Specified by:

tget in interface ObjectKeyByteMap

Overrides:

tget in class AbstractObjectKeyByteMap