bak.pcj.map
Class CharKeyByteOpenHashMap

java.lang.Object
  bak.pcj.map.AbstractCharKeyByteMap
      bak.pcj.map.CharKeyByteOpenHashMap

All Implemented Interfaces:

CharKeyByteMap, Cloneable, Serializable

public class CharKeyByteOpenHashMap

extends AbstractCharKeyByteMap

implements CharKeyByteMap, Cloneable, Serializable

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

Since:

1.0

See Also:

CharKeyByteChainedHashMap, 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

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

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

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

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

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

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

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

CharKeyByteOpenHashMap(CharKeyByteMap map)
Creates a new hash map with the same mappings as a specified map.

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

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

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

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

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

Method Summary

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

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.CharKeyByteMap

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

CharKeyByteOpenHashMap

public CharKeyByteOpenHashMap()

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

CharKeyByteOpenHashMap

public CharKeyByteOpenHashMap(CharKeyByteMap 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.

CharKeyByteOpenHashMap

public CharKeyByteOpenHashMap(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.

CharKeyByteOpenHashMap

public CharKeyByteOpenHashMap(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.

CharKeyByteOpenHashMap

public CharKeyByteOpenHashMap(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.

CharKeyByteOpenHashMap

public CharKeyByteOpenHashMap(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.

CharKeyByteOpenHashMap

public CharKeyByteOpenHashMap(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.

CharKeyByteOpenHashMap

public CharKeyByteOpenHashMap(CharHashFunction keyhash)

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

Parameters:

keyhash - the hash function to use when hashing keys.

Throws:

NullPointerException - if keyhash is null.

CharKeyByteOpenHashMap

public CharKeyByteOpenHashMap(CharHashFunction keyhash,
                              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:

keyhash - the hash function to use when hashing keys.

capacity - the initial capacity of the map.

Throws:

IllegalArgumentException - if capacity is negative.

NullPointerException - if keyhash is null.

CharKeyByteOpenHashMap

public CharKeyByteOpenHashMap(CharHashFunction keyhash,
                              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:

keyhash - the hash function to use when hashing keys.

loadFactor - the load factor of the map.

Throws:

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

NullPointerException - if keyhash is null.

CharKeyByteOpenHashMap

public CharKeyByteOpenHashMap(CharHashFunction keyhash,
                              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:

keyhash - the hash function to use when hashing keys.

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.

NullPointerException - if keyhash is null.

CharKeyByteOpenHashMap

public CharKeyByteOpenHashMap(CharHashFunction keyhash,
                              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:

keyhash - the hash function to use when hashing keys.

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.

NullPointerException - if keyhash is null.

CharKeyByteOpenHashMap

public CharKeyByteOpenHashMap(CharHashFunction keyhash,
                              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:

keyhash - the hash function to use when hashing keys.

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.

NullPointerException - if keyhash is null.

Method Detail

keySet

public CharSet keySet()

Description copied from interface: CharKeyByteMap

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 CharKeyByteMap

Returns:

a set view of the keys of this map.

lget

public byte lget()

Description copied from interface: CharKeyByteMap

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

Specified by:

lget in interface CharKeyByteMap

Returns:

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

See Also:

CharKeyByteMap.get(char), CharKeyByteMap.tget(char), CharKeyByteMap.containsKey(char)

put

public byte put(char key,
                byte value)

Description copied from interface: CharKeyByteMap

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 CharKeyByteMap

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: CharKeyByteMap

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 CharKeyByteMap

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 CharKeyByteMapIterator entries()

Description copied from interface: CharKeyByteMap

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 CharKeyByteMap

Returns:

an iterator over the entries of this map.

clear

public void clear()

Description copied from interface: CharKeyByteMap

Clears this map.

Specified by:

clear in interface CharKeyByteMap

Overrides:

clear in class AbstractCharKeyByteMap

containsKey

public boolean containsKey(char key)

Description copied from interface: CharKeyByteMap

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 CharKeyByteMap

Overrides:

containsKey in class AbstractCharKeyByteMap

containsValue

public boolean containsValue(byte value)

Description copied from interface: CharKeyByteMap

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

Specified by:

containsValue in interface CharKeyByteMap

Overrides:

containsValue in class AbstractCharKeyByteMap

get

public byte get(char key)

Description copied from interface: CharKeyByteMap

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 CharKeyByteMap

Overrides:

get in class AbstractCharKeyByteMap

isEmpty

public boolean isEmpty()

Description copied from interface: CharKeyByteMap

Indicates whether this map is empty.

Specified by:

isEmpty in interface CharKeyByteMap

Overrides:

isEmpty in class AbstractCharKeyByteMap

remove

public byte remove(char key)

Description copied from interface: CharKeyByteMap

Removes the mapping from a specified key from this map.

Specified by:

remove in interface CharKeyByteMap

Overrides:

remove in class AbstractCharKeyByteMap

size

public int size()

Description copied from interface: CharKeyByteMap

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

Specified by:

size in interface CharKeyByteMap

Overrides:

size in class AbstractCharKeyByteMap

tget

public byte tget(char key)

Description copied from interface: CharKeyByteMap

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 CharKeyByteMap

Overrides:

tget in class AbstractCharKeyByteMap