bak.pcj.map
Class AbstractLongKeyShortMap

java.lang.Object
  bak.pcj.map.AbstractLongKeyShortMap

All Implemented Interfaces:

LongKeyShortMap

Direct Known Subclasses:

LongKeyShortChainedHashMap, LongKeyShortOpenHashMap, MapToLongKeyShortMapAdapter

public abstract class AbstractLongKeyShortMap

extends Object

implements LongKeyShortMap

This class represents an abstract base for implementing maps from long values to short values. All operations that can be implemented using iterators are implemented as such. In most cases, this is hardly an efficient solution, and at least some of those methods should be overridden by sub-classes.

Since:

1.0

Constructor Summary

protected

AbstractLongKeyShortMap() Default constructor to be invoked by sub-classes.

Method Summary

void	clear() Clears this map.
boolean	containsKey(long 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.
boolean	equals(Object obj) Indicates whether this map is equal to some object.
short	get(long key) Maps a specified key to a value.
int	hashCode() Returns a hash code value for this map.
boolean	isEmpty() Indicates whether this map is empty.
void	putAll(LongKeyShortMap map) Adds all mappings from a specified map to this map.
short	remove(long key) Removes the mapping from a specified key from this map.
int	size() Returns the size of this map.
short	tget(long key) Maps a specified key to a value.
String	toString() Returns a string representation of this map.
void	trimToSize() Does nothing.

Methods inherited from class java.lang.Object

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

Methods inherited from interface bak.pcj.map.LongKeyShortMap

entries, keySet, lget, put, values

Constructor Detail

AbstractLongKeyShortMap

protected AbstractLongKeyShortMap()

Default constructor to be invoked by sub-classes.

Method Detail

clear

public void clear()

Description copied from interface: LongKeyShortMap

Clears this map.

Specified by:

clear in interface LongKeyShortMap

remove

public short remove(long key)

Description copied from interface: LongKeyShortMap

Removes the mapping from a specified key from this map.

Specified by:

remove in interface LongKeyShortMap

Parameters:

key - the key whose mapping to remove from 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

putAll

public void putAll(LongKeyShortMap map)

Description copied from interface: LongKeyShortMap

Adds all mappings from a specified map to this map. Any existing mappings whose keys collide with a new mapping is overwritten by the new mapping.

Specified by:

putAll in interface LongKeyShortMap

Parameters:

map - the map whose mappings to add to this map.

containsKey

public boolean containsKey(long key)

Description copied from interface: LongKeyShortMap

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 LongKeyShortMap

Parameters:

key - the key to test for.

Returns:

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

See Also:

LongKeyShortMap.lget()

get

public short get(long key)

Description copied from interface: LongKeyShortMap

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 LongKeyShortMap

Parameters:

key - the key to map to a value.

Returns:

the value that the specified key maps to, or a default value, if no such mapping exists.

See Also:

MapDefaults, LongKeyShortMap.tget(long), LongKeyShortMap.lget()

containsValue

public boolean containsValue(short value)

Description copied from interface: LongKeyShortMap

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

Specified by:

containsValue in interface LongKeyShortMap

Parameters:

value - the value to test for.

Returns:

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

equals

public boolean equals(Object obj)

Description copied from interface: LongKeyShortMap

Indicates whether this map is equal to some object.

Specified by:

equals in interface LongKeyShortMap

hashCode

public int hashCode()

Description copied from interface: LongKeyShortMap

Returns a hash code value for this map.

Specified by:

hashCode in interface LongKeyShortMap

isEmpty

public boolean isEmpty()

Description copied from interface: LongKeyShortMap

Indicates whether this map is empty.

Specified by:

isEmpty in interface LongKeyShortMap

Returns:

true if this map is empty; returns false otherwise.

size

public int size()

Description copied from interface: LongKeyShortMap

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

Specified by:

size in interface LongKeyShortMap

Returns:

the size of this map.

tget

public short tget(long key)

Description copied from interface: LongKeyShortMap

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 LongKeyShortMap

Parameters:

key - the key to map to a value.

Returns:

the value that the specified key maps to.

See Also:

LongKeyShortMap.get(long), LongKeyShortMap.lget()

toString

public String toString()

Returns a string representation of this map.

Returns:

a string representation of this map.

trimToSize

public void trimToSize()

Does nothing. Sub-classes may provide an implementation to minimize memory usage, but this is not required since many implementations will always have minimal memory usage.

Specified by:

trimToSize in interface LongKeyShortMap