bak.pcj.map
Interface LongKeyMap

All Known Implementing Classes:

AbstractLongKeyMap, LongKeyChainedHashMap, LongKeyOpenHashMap, MapToLongKeyMapAdapter

public interface LongKeyMap

This interface represents maps from long values to objects.

Since:

1.0

See Also:

Map

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.
LongKeyMapIterator	entries() Returns an iterator over the entries of this map.
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.
LongSet	keySet() Returns a set view of the keys of this map.
Object	put(long key, Object value) Adds a mapping from a specified key to a specified value to this map.
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.
Collection	values() Returns a collection view of the values in this map.

Method Detail

clear

public void clear()

Clears this map.

containsKey

public boolean containsKey(long key)

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

Parameters:

key - the key to test for.

Returns:

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

containsValue

public boolean containsValue(Object value)

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

Parameters:

value - the value to test for.

Returns:

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

entries

public LongKeyMapIterator entries()

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.

Returns:

an iterator over the entries of this map.

equals

public boolean equals(Object obj)

Indicates whether this map is equal to some object.

Parameters:

obj - the object with which to compare this map.

Returns:

true if this map is equal to the specified object; returns false otherwise.

get

public Object get(long key)

Maps a specified key to a value.

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.

hashCode

public int hashCode()

Returns a hash code value for this map.

Returns:

a hash code value for this map.

isEmpty

public boolean isEmpty()

Indicates whether this map is empty.

Returns:

true if this map is empty; returns false otherwise.

keySet

public LongSet keySet()

Returns a set view of the keys of this map. The set is not directly modifiable, but changes to the map are reflected in the set.

Returns:

a set view of the keys of this map.

put

public Object put(long key,
                  Object value)

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.

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 (which can be null) if a mapping from the specified key already existed in this map; returns null otherwise.

Throws:

UnsupportedOperationException - if the operation is not supported by this map.

putAll

public void putAll(LongKeyMap map)

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.

Parameters:

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

Throws:

NullPointerException - if map is null.

UnsupportedOperationException - if the operation is not supported by this map.

remove

public Object remove(long key)

Removes the mapping from a specified key from this map.

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.

Throws:

UnsupportedOperationException - if the operation is not supported by this map.

size

public int size()

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

Returns:

the size of this map.

values

public Collection values()

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.

Returns:

a collection view of the values in this map.