Package com.uwyn.jhighlight.pcj.map

Class CharKeyOpenHashMap

java.lang.Object

com.uwyn.jhighlight.pcj.map.AbstractCharKeyMap

com.uwyn.jhighlight.pcj.map.CharKeyOpenHashMap

All Implemented Interfaces:

CharKeyMap, Serializable, Cloneable

public class CharKeyOpenHashMap
extends AbstractCharKeyMap
implements CharKeyMap, Cloneable, Serializable

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

Since:

1.0

Version:

1.3 21-08-2003 19:45

Author:

Søren Bak

See Also:

CharKeyChainedHashMap, Map, Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
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

Constructors

Constructor	Description
CharKeyOpenHashMap()	Creates a new hash map with capacity 11, a relative growth factor of 1.0, and a load factor of 75%.
CharKeyOpenHashMap(double loadFactor)	Creates a new hash map with a capacity of 11, a relative growth factor of 1.0, and a specified load factor.
CharKeyOpenHashMap(int capacity)	Creates a new hash map with a specified capacity, a relative growth factor of 1.0, and a load factor of 75%.
CharKeyOpenHashMap(int capacity, double loadFactor)	Creates a new hash map with a specified capacity and load factor, and a relative growth factor of 1.0.
CharKeyOpenHashMap(int capacity, double loadFactor, double growthFactor)	Creates a new hash map with a specified capacity, load factor, and relative growth factor.
CharKeyOpenHashMap(int capacity, double loadFactor, int growthChunk)	Creates a new hash map with a specified capacity, load factor, and absolute growth factor.
CharKeyOpenHashMap(CharHashFunction keyhash)	Creates a new hash map with capacity 11, a relative growth factor of 1.0, and a load factor of 75%.
CharKeyOpenHashMap(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.
CharKeyOpenHashMap(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%.
CharKeyOpenHashMap(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.
CharKeyOpenHashMap(CharHashFunction keyhash, int capacity, double loadFactor, double growthFactor)	Creates a new hash map with a specified capacity, load factor, and relative growth factor.
CharKeyOpenHashMap(CharHashFunction keyhash, int capacity, double loadFactor, int growthChunk)	Creates a new hash map with a specified capacity, load factor, and absolute growth factor.
CharKeyOpenHashMap(CharKeyMap map)	Creates a new hash map with the same mappings as a specified map.

Method Summary

Modifier and Type	Method	Description
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(Object value)	Indicates whether this map contains a mapping to a specified value.
CharKeyMapIterator	entries()	Returns an iterator over the entries of this map.
Object	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.
Object	put(char key, Object value)	Adds a mapping from a specified key to a specified value to this map.
Object	remove(char 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 com.uwyn.jhighlight.pcj.map.AbstractCharKeyMap

equals, hashCode, putAll, toString, trimToSize

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.uwyn.jhighlight.pcj.map.CharKeyMap

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

CharKeyOpenHashMap

public CharKeyOpenHashMap()

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

CharKeyOpenHashMap

public CharKeyOpenHashMap(CharKeyMap 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.

CharKeyOpenHashMap

public CharKeyOpenHashMap(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.

CharKeyOpenHashMap

public CharKeyOpenHashMap(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.

CharKeyOpenHashMap

public CharKeyOpenHashMap(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.

CharKeyOpenHashMap

public CharKeyOpenHashMap(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.

CharKeyOpenHashMap

public CharKeyOpenHashMap(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.

CharKeyOpenHashMap

public CharKeyOpenHashMap(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.

CharKeyOpenHashMap

public CharKeyOpenHashMap(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.

CharKeyOpenHashMap

public CharKeyOpenHashMap(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.

CharKeyOpenHashMap

public CharKeyOpenHashMap(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.

CharKeyOpenHashMap

public CharKeyOpenHashMap(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.

CharKeyOpenHashMap

public CharKeyOpenHashMap(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: CharKeyMap

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 CharKeyMap

Returns:

a set view of the keys of this map.

put

public Object put(char key,
                  Object value)

Description copied from interface: CharKeyMap

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 CharKeyMap

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: CharKeyMap

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 CharKeyMap

Returns:

a collection view of the values in this map.

clone

public Object clone()

Returns a clone of this hash map.

Overrides:

clone in class Object

Returns:

a clone of this hash map.

Since:

1.1

entries

public CharKeyMapIterator entries()

Description copied from interface: CharKeyMap

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 CharKeyMap

Returns:

an iterator over the entries of this map.

clear

public void clear()

Description copied from interface: CharKeyMap

Clears this map.

Specified by:

clear in interface CharKeyMap

Overrides:

clear in class AbstractCharKeyMap

containsKey

public boolean containsKey(char key)

Description copied from interface: CharKeyMap

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

Specified by:

containsKey in interface CharKeyMap

Overrides:

containsKey in class AbstractCharKeyMap

Parameters:

key - the key to test for.

Returns:

true if this map contains a mapping from the specified key; returns false otherwise.

containsValue

public boolean containsValue(Object value)

Description copied from interface: CharKeyMap

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

Specified by:

containsValue in interface CharKeyMap

Overrides:

containsValue in class AbstractCharKeyMap

Parameters:

value - the value to test for.

Returns:

true if this map contains at least one mapping to the specified value; returns false otherwise.

get

public Object get(char key)

Description copied from interface: CharKeyMap

Maps a specified key to a value.

Specified by:

get in interface CharKeyMap

Overrides:

get in class AbstractCharKeyMap

Parameters:

key - the key to map to a value.

Returns:

the value that the specified key maps to; returns null, if no mapping exists for the specified key.

isEmpty

public boolean isEmpty()

Description copied from interface: CharKeyMap

Indicates whether this map is empty.

Specified by:

isEmpty in interface CharKeyMap

Overrides:

isEmpty in class AbstractCharKeyMap

Returns:

true if this map is empty; returns false otherwise.

remove

public Object remove(char key)

Description copied from interface: CharKeyMap

Removes the mapping from a specified key from this map.

Specified by:

remove in interface CharKeyMap

Overrides:

remove in class AbstractCharKeyMap

Parameters:

key - the key whose mapping to remove from 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.

size

public int size()

Description copied from interface: CharKeyMap

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

Specified by:

size in interface CharKeyMap

Overrides:

size in class AbstractCharKeyMap

Returns:

the size of this map.