bak.pcj.map
Class AbstractDoubleKeyMap

java.lang.Object
  bak.pcj.map.AbstractDoubleKeyMap

All Implemented Interfaces:

DoubleKeyMap

Direct Known Subclasses:

DoubleKeyChainedHashMap, DoubleKeyOpenHashMap, MapToDoubleKeyMapAdapter

public abstract class AbstractDoubleKeyMap

extends Object

implements DoubleKeyMap

This class represents an abstract base for implementing maps from double 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

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

Method Summary

void	clear() Clears this map.
boolean	containsKey(double 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(double 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(DoubleKeyMap map) Adds all mappings from a specified map to this map.
Object	remove(double 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.DoubleKeyMap

entries, keySet, put, values

Constructor Detail

AbstractDoubleKeyMap

protected AbstractDoubleKeyMap()

Default constructor to be invoked by sub-classes.

Method Detail

clear

public void clear()

Description copied from interface: DoubleKeyMap

Clears this map.

Specified by:

clear in interface DoubleKeyMap

remove

public Object remove(double key)

Description copied from interface: DoubleKeyMap

Removes the mapping from a specified key from this map.

Specified by:

remove in interface DoubleKeyMap

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(DoubleKeyMap map)

Description copied from interface: DoubleKeyMap

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 DoubleKeyMap

Parameters:

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

containsKey

public boolean containsKey(double key)

Description copied from interface: DoubleKeyMap

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

Specified by:

containsKey in interface DoubleKeyMap

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(double key)

Description copied from interface: DoubleKeyMap

Maps a specified key to a value.

Specified by:

get in interface DoubleKeyMap

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: DoubleKeyMap

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

Specified by:

containsValue in interface DoubleKeyMap

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: DoubleKeyMap

Indicates whether this map is equal to some object.

Specified by:

equals in interface DoubleKeyMap

hashCode

public int hashCode()

Description copied from interface: DoubleKeyMap

Returns a hash code value for this map.

Specified by:

hashCode in interface DoubleKeyMap

isEmpty

public boolean isEmpty()

Description copied from interface: DoubleKeyMap

Indicates whether this map is empty.

Specified by:

isEmpty in interface DoubleKeyMap

Returns:

true if this map is empty; returns false otherwise.

size

public int size()

Description copied from interface: DoubleKeyMap

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

Specified by:

size in interface DoubleKeyMap

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.