bak.pcj.map
Class AbstractLongKeyLongMap

java.lang.Object
  bak.pcj.map.AbstractLongKeyLongMap

All Implemented Interfaces:

LongKeyLongMap

Direct Known Subclasses:

LongKeyLongChainedHashMap, LongKeyLongOpenHashMap, MapToLongKeyLongMapAdapter

public abstract class AbstractLongKeyLongMap

extends Object

implements LongKeyLongMap

This class represents an abstract base for implementing maps from long values to long 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

AbstractLongKeyLongMap() 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(long 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.
long	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(LongKeyLongMap map) Adds all mappings from a specified map to this map.
long	remove(long key) Removes the mapping from a specified key from this map.
int	size() Returns the size of this map.
long	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.LongKeyLongMap

entries, keySet, lget, put, values

Constructor Detail

AbstractLongKeyLongMap

protected AbstractLongKeyLongMap()

Default constructor to be invoked by sub-classes.

Method Detail

clear

public void clear()

Description copied from interface: LongKeyLongMap

Clears this map.

Specified by:

clear in interface LongKeyLongMap

remove

public long remove(long key)

Description copied from interface: LongKeyLongMap

Removes the mapping from a specified key from this map.

Specified by:

remove in interface LongKeyLongMap

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(LongKeyLongMap map)

Description copied from interface: LongKeyLongMap

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 LongKeyLongMap

Parameters:

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

containsKey

public boolean containsKey(long key)

Description copied from interface: LongKeyLongMap

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 LongKeyLongMap

Parameters:

key - the key to test for.

Returns:

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

See Also:

LongKeyLongMap.lget()

get

public long get(long key)

Description copied from interface: LongKeyLongMap

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 LongKeyLongMap

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, LongKeyLongMap.tget(long), LongKeyLongMap.lget()

containsValue

public boolean containsValue(long value)

Description copied from interface: LongKeyLongMap

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

Specified by:

containsValue in interface LongKeyLongMap

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: LongKeyLongMap

Indicates whether this map is equal to some object.

Specified by:

equals in interface LongKeyLongMap

hashCode

public int hashCode()

Description copied from interface: LongKeyLongMap

Returns a hash code value for this map.

Specified by:

hashCode in interface LongKeyLongMap

isEmpty

public boolean isEmpty()

Description copied from interface: LongKeyLongMap

Indicates whether this map is empty.

Specified by:

isEmpty in interface LongKeyLongMap

Returns:

true if this map is empty; returns false otherwise.

size

public int size()

Description copied from interface: LongKeyLongMap

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

Specified by:

size in interface LongKeyLongMap

Returns:

the size of this map.

tget

public long tget(long key)

Description copied from interface: LongKeyLongMap

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 LongKeyLongMap

Parameters:

key - the key to map to a value.

Returns:

the value that the specified key maps to.

See Also:

LongKeyLongMap.get(long), LongKeyLongMap.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 LongKeyLongMap