bak.pcj.map
Class AbstractLongKeyMap

java.lang.Object
  bak.pcj.map.AbstractLongKeyMap

All Implemented Interfaces:

LongKeyMap

Direct Known Subclasses:

LongKeyChainedHashMap, LongKeyOpenHashMap, MapToLongKeyMapAdapter

public abstract class AbstractLongKeyMap

extends Object

implements LongKeyMap

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

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

entries, keySet, put, values

Constructor Detail

AbstractLongKeyMap

protected AbstractLongKeyMap()

Default constructor to be invoked by sub-classes.

Method Detail

clear

public void clear()

Description copied from interface: LongKeyMap

Clears this map.

Specified by:

clear in interface LongKeyMap

remove

public Object remove(long key)

Description copied from interface: LongKeyMap

Removes the mapping from a specified key from this map.

Specified by:

remove in interface LongKeyMap

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.

putAll

public void putAll(LongKeyMap map)

Description copied from interface: LongKeyMap

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 LongKeyMap

Parameters:

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

containsKey

public boolean containsKey(long key)

Description copied from interface: LongKeyMap

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

Specified by:

containsKey in interface LongKeyMap

Parameters:

key - the key to test for.

Returns:

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

get

public Object get(long key)

Description copied from interface: LongKeyMap

Maps a specified key to a value.

Specified by:

get in interface LongKeyMap

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.

containsValue

public boolean containsValue(Object value)

Description copied from interface: LongKeyMap

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

Specified by:

containsValue in interface LongKeyMap

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: LongKeyMap

Indicates whether this map is equal to some object.

Specified by:

equals in interface LongKeyMap

hashCode

public int hashCode()

Description copied from interface: LongKeyMap

Returns a hash code value for this map.

Specified by:

hashCode in interface LongKeyMap

isEmpty

public boolean isEmpty()

Description copied from interface: LongKeyMap

Indicates whether this map is empty.

Specified by:

isEmpty in interface LongKeyMap

Returns:

true if this map is empty; returns false otherwise.

size

public int size()

Description copied from interface: LongKeyMap

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

Specified by:

size in interface LongKeyMap

Returns:

the size of this map.

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.