bak.pcj.map
Class ByteKeyChainedHashMap

java.lang.Object
  bak.pcj.map.AbstractByteKeyMap
      bak.pcj.map.ByteKeyChainedHashMap

All Implemented Interfaces:

ByteKeyMap, Cloneable, Serializable

public class ByteKeyChainedHashMap

extends AbstractByteKeyMap

implements ByteKeyMap, Cloneable, Serializable

This class represents chained hash table based maps from byte values to objects.

Since:

1.0

See Also:

ByteKeyOpenHashMap, 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

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

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

ByteKeyChainedHashMap(ByteHashFunction 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.

ByteKeyChainedHashMap(ByteHashFunction 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%.

ByteKeyChainedHashMap(ByteHashFunction 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.

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

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

ByteKeyChainedHashMap(ByteKeyMap map)
Creates a new hash map with the same mappings as a specified map.

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

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

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

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

ByteKeyChainedHashMap(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(byte key) Indicates whether this map contains a mapping from a specified key.
boolean	containsValue(Object value) Indicates whether this map contains a mapping to a specified value.
ByteKeyMapIterator	entries() Returns an iterator over the entries of this map.
Object	get(byte key) Maps a specified key to a value.
boolean	isEmpty() Indicates whether this map is empty.
ByteSet	keySet() Returns a set view of the keys of this map.
Object	put(byte key, Object value) Adds a mapping from a specified key to a specified value to this map.
Object	remove(byte key) Removes the mapping from a specified key from this map.
int	size() Returns the size of this map.
Collection	values() Returns a collection view of the values in this map.

Methods inherited from class bak.pcj.map.AbstractByteKeyMap

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.ByteKeyMap

equals, hashCode, putAll

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

ByteKeyChainedHashMap

public ByteKeyChainedHashMap()

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

ByteKeyChainedHashMap

public ByteKeyChainedHashMap(ByteKeyMap 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.

ByteKeyChainedHashMap

public ByteKeyChainedHashMap(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.

ByteKeyChainedHashMap

public ByteKeyChainedHashMap(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.

ByteKeyChainedHashMap

public ByteKeyChainedHashMap(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.

ByteKeyChainedHashMap

public ByteKeyChainedHashMap(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.

ByteKeyChainedHashMap

public ByteKeyChainedHashMap(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;

ByteKeyChainedHashMap

public ByteKeyChainedHashMap(ByteHashFunction 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.

ByteKeyChainedHashMap

public ByteKeyChainedHashMap(ByteHashFunction 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.

ByteKeyChainedHashMap

public ByteKeyChainedHashMap(ByteHashFunction 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.

NullPointerException - if keyhash is null.

ByteKeyChainedHashMap

public ByteKeyChainedHashMap(ByteHashFunction 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.

ByteKeyChainedHashMap

public ByteKeyChainedHashMap(ByteHashFunction 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.

ByteKeyChainedHashMap

public ByteKeyChainedHashMap(ByteHashFunction 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 ByteSet keySet()

Description copied from interface: ByteKeyMap

Returns a set view of the keys of this map. The set is not directly modifiable, but changes to the map are reflected in the set.

Specified by:

keySet in interface ByteKeyMap

Returns:

a set view of the keys of this map.

put

public Object put(byte key,
                  Object value)

Description copied from interface: ByteKeyMap

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 ByteKeyMap

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 (which can be null) if a mapping from the specified key already existed in this map; returns null otherwise.

values

public Collection values()

Description copied from interface: ByteKeyMap

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 ByteKeyMap

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 ByteKeyMapIterator entries()

Description copied from interface: ByteKeyMap

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 ByteKeyMap

Returns:

an iterator over the entries of this map.

clear

public void clear()

Description copied from interface: ByteKeyMap

Clears this map.

Specified by:

clear in interface ByteKeyMap

Overrides:

clear in class AbstractByteKeyMap

containsKey

public boolean containsKey(byte key)

Description copied from interface: ByteKeyMap

Indicates whether this map contains a mapping from a specified key.

Specified by:

containsKey in interface ByteKeyMap

Overrides:

containsKey in class AbstractByteKeyMap

containsValue

public boolean containsValue(Object value)

Description copied from interface: ByteKeyMap

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

Specified by:

containsValue in interface ByteKeyMap

Overrides:

containsValue in class AbstractByteKeyMap

get

public Object get(byte key)

Description copied from interface: ByteKeyMap

Maps a specified key to a value.

Specified by:

get in interface ByteKeyMap

Overrides:

get in class AbstractByteKeyMap

isEmpty

public boolean isEmpty()

Description copied from interface: ByteKeyMap

Indicates whether this map is empty.

Specified by:

isEmpty in interface ByteKeyMap

Overrides:

isEmpty in class AbstractByteKeyMap

remove

public Object remove(byte key)

Description copied from interface: ByteKeyMap

Removes the mapping from a specified key from this map.

Specified by:

remove in interface ByteKeyMap

Overrides:

remove in class AbstractByteKeyMap

size

public int size()

Description copied from interface: ByteKeyMap

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

Specified by:

size in interface ByteKeyMap

Overrides:

size in class AbstractByteKeyMap