PCJ API
Version 1.2

bak.pcj.map
Class IntKeyShortChainedHashMap

java.lang.Object
  extended bybak.pcj.map.AbstractIntKeyShortMap
      extended bybak.pcj.map.IntKeyShortChainedHashMap
All Implemented Interfaces:
Cloneable, IntKeyShortMap, Serializable

public class IntKeyShortChainedHashMap
extends AbstractIntKeyShortMap
implements IntKeyShortMap, Cloneable, Serializable

This class represents chained hash table based maps from int values to short values.

Since:
1.0
See Also:
IntKeyShortOpenHashMap, 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
IntKeyShortChainedHashMap()
          Creates a new hash map with capacity 11, a relative growth factor of 1.0, and a load factor of 75%.
IntKeyShortChainedHashMap(double loadFactor)
          Creates a new hash map with a capacity of 11, a relative growth factor of 1.0, and a specified load factor.
IntKeyShortChainedHashMap(int capacity)
          Creates a new hash map with a specified capacity, a relative growth factor of 1.0, and a load factor of 75%.
IntKeyShortChainedHashMap(int capacity, double loadFactor)
          Creates a new hash map with a specified capacity and load factor, and a relative growth factor of 1.0.
IntKeyShortChainedHashMap(int capacity, double loadFactor, double growthFactor)
          Creates a new hash map with a specified capacity, load factor, and relative growth factor.
IntKeyShortChainedHashMap(int capacity, double loadFactor, int growthChunk)
          Creates a new hash map with a specified capacity, load factor, and absolute growth factor.
IntKeyShortChainedHashMap(IntHashFunction keyhash)
          Creates a new hash map with capacity 11, a relative growth factor of 1.0, and a load factor of 75%.
IntKeyShortChainedHashMap(IntHashFunction 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.
IntKeyShortChainedHashMap(IntHashFunction 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%.
IntKeyShortChainedHashMap(IntHashFunction 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.
IntKeyShortChainedHashMap(IntHashFunction keyhash, int capacity, double loadFactor, double growthFactor)
          Creates a new hash map with a specified capacity, load factor, and relative growth factor.
IntKeyShortChainedHashMap(IntHashFunction keyhash, int capacity, double loadFactor, int growthChunk)
          Creates a new hash map with a specified capacity, load factor, and absolute growth factor.
IntKeyShortChainedHashMap(IntKeyShortMap 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(int key)
          Indicates whether this map contains a mapping from a specified key.
 boolean containsValue(short value)
          Indicates whether this map contains a mapping to a specified value.
 IntKeyShortMapIterator entries()
          Returns an iterator over the entries of this map.
 short get(int key)
          Maps a specified key to a value.
 boolean isEmpty()
          Indicates whether this map is empty.
 IntSet keySet()
          Returns a set view of the keys of this map.
 short lget()
          Returns the last value corresponding to a positive result from containsKey(int).
 short put(int key, short value)
          Adds a mapping from a specified key to a specified value to this map.
 short remove(int key)
          Removes the mapping from a specified key from this map.
 int size()
          Returns the size of this map.
 short tget(int key)
          Maps a specified key to a value.
 ShortCollection values()
          Returns a collection view of the values in this map.
 
Methods inherited from class bak.pcj.map.AbstractIntKeyShortMap
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.IntKeyShortMap
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

IntKeyShortChainedHashMap

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


IntKeyShortChainedHashMap

public IntKeyShortChainedHashMap(IntKeyShortMap 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.

IntKeyShortChainedHashMap

public IntKeyShortChainedHashMap(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.

IntKeyShortChainedHashMap

public IntKeyShortChainedHashMap(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.

IntKeyShortChainedHashMap

public IntKeyShortChainedHashMap(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.

IntKeyShortChainedHashMap

public IntKeyShortChainedHashMap(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.

IntKeyShortChainedHashMap

public IntKeyShortChainedHashMap(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;

IntKeyShortChainedHashMap

public IntKeyShortChainedHashMap(IntHashFunction 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.

IntKeyShortChainedHashMap

public IntKeyShortChainedHashMap(IntHashFunction 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.

IntKeyShortChainedHashMap

public IntKeyShortChainedHashMap(IntHashFunction 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.

IntKeyShortChainedHashMap

public IntKeyShortChainedHashMap(IntHashFunction 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.

IntKeyShortChainedHashMap

public IntKeyShortChainedHashMap(IntHashFunction 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.

IntKeyShortChainedHashMap

public IntKeyShortChainedHashMap(IntHashFunction 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 IntSet keySet()
Description copied from interface: IntKeyShortMap
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 IntKeyShortMap
Returns:
a set view of the keys of this map.

lget

public short lget()
Description copied from interface: IntKeyShortMap
Returns the last value corresponding to a positive result from containsKey(int). This is useful for checking checking the existence of a mapping while avoiding two lookups on the same key.

Specified by:
lget in interface IntKeyShortMap
Returns:
the value corresponding to the key from the last invokation of containsKey(int).
See Also:
IntKeyShortMap.get(int), IntKeyShortMap.tget(int), IntKeyShortMap.containsKey(int)

put

public short put(int key,
                 short value)
Description copied from interface: IntKeyShortMap
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 IntKeyShortMap
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 ShortCollection values()
Description copied from interface: IntKeyShortMap
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 IntKeyShortMap
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 IntKeyShortMapIterator entries()
Description copied from interface: IntKeyShortMap
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 IntKeyShortMap
Returns:
an iterator over the entries of this map.

clear

public void clear()
Description copied from interface: IntKeyShortMap
Clears this map.

Specified by:
clear in interface IntKeyShortMap
Overrides:
clear in class AbstractIntKeyShortMap

containsKey

public boolean containsKey(int key)
Description copied from interface: IntKeyShortMap
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 IntKeyShortMap
Overrides:
containsKey in class AbstractIntKeyShortMap

containsValue

public boolean containsValue(short value)
Description copied from interface: IntKeyShortMap
Indicates whether this map contains a mapping to a specified value.

Specified by:
containsValue in interface IntKeyShortMap
Overrides:
containsValue in class AbstractIntKeyShortMap

get

public short get(int key)
Description copied from interface: IntKeyShortMap
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 IntKeyShortMap
Overrides:
get in class AbstractIntKeyShortMap

isEmpty

public boolean isEmpty()
Description copied from interface: IntKeyShortMap
Indicates whether this map is empty.

Specified by:
isEmpty in interface IntKeyShortMap
Overrides:
isEmpty in class AbstractIntKeyShortMap

remove

public short remove(int key)
Description copied from interface: IntKeyShortMap
Removes the mapping from a specified key from this map.

Specified by:
remove in interface IntKeyShortMap
Overrides:
remove in class AbstractIntKeyShortMap

size

public int size()
Description copied from interface: IntKeyShortMap
Returns the size of this map. The size is defined as the number of mappings from keys to values.

Specified by:
size in interface IntKeyShortMap
Overrides:
size in class AbstractIntKeyShortMap

tget

public short tget(int key)
Description copied from interface: IntKeyShortMap
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 IntKeyShortMap
Overrides:
tget in class AbstractIntKeyShortMap

PCJ API
Version 1.2

Report a bug or request a feature.
Further information on the development and latest release of PCJ can be found at the project homepage.

Primitive Collections for Java is released under the GNU Lesser General Public License.
Copyright © 2002, 2003 Søren Bak. All Rights Reserved.

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