it.unimi.dsi.fastutil.objects
Class Object2LongMaps

java.lang.Object
  extended byit.unimi.dsi.fastutil.objects.Object2LongMaps

public class Object2LongMaps
extends Object

A class providing static methods and objects that do useful things with type-specific maps.

See Also:
Maps, Collections

Nested Class Summary
static class Object2LongMaps.EmptyMap
          An immutable class representing an empty type-specific map.
static class Object2LongMaps.Singleton
          An immutable class representing a type-specific singleton map.
static class Object2LongMaps.SynchronizedMap
          A synchronized wrapper class for maps.
 
Field Summary
static Object2LongMaps.EmptyMap EMPTY_MAP
          An empty type-specific map (immutable).
 
Method Summary
static Object2LongMap singleton(Object key, long value)
          Returns a type-specific immutable map containing only the specified pair.
static Object2LongMap singleton(Object key, Object value)
          Returns a type-specific immutable map containing only the specified pair.
static Object2LongMap synchronize(Object2LongMap m)
          Returns a synchronized type-specific map backed by the given type-specific map.
static Object2LongMap synchronize(Object2LongMap m, Object sync)
          Returns a synchronized type-specific map backed by the given type-specific map, using an assigned object to synchronize.
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

EMPTY_MAP

public static final Object2LongMaps.EmptyMap EMPTY_MAP
An empty type-specific map (immutable). It is serializable and cloneable.

Method Detail

singleton

public static Object2LongMap singleton(Object key,
                                       long value)
Returns a type-specific immutable map containing only the specified pair. The returned map is serializable and cloneable.

Note that albeit the returned map is immutable, its default return value may be changed.

Parameters:
key - the only key of the returned map.
value - the only value of the returned map.
Returns:
a type-specific immutable map containing just the pair <key,value>.

singleton

public static Object2LongMap singleton(Object key,
                                       Object value)
Returns a type-specific immutable map containing only the specified pair. The returned map is serializable and cloneable.

Note that albeit the returned map is immutable, its default return value may be changed.

Parameters:
key - the only key of the returned map.
value - the only value of the returned map.
Returns:
a type-specific immutable map containing just the pair <key,value>.

synchronize

public static Object2LongMap synchronize(Object2LongMap m)
Returns a synchronized type-specific map backed by the given type-specific map.

Parameters:
m - the map to be wrapped in a synchronized map.
Returns:
a synchronized view of the specified map.
See Also:
Collections.synchronizedMap(Map)

synchronize

public static Object2LongMap synchronize(Object2LongMap m,
                                         Object sync)
Returns a synchronized type-specific map backed by the given type-specific map, using an assigned object to synchronize.

Parameters:
m - the map to be wrapped in a synchronized map.
sync - an object that will be used to synchronize the access to the map.
Returns:
a synchronized view of the specified map.
See Also:
Collections.synchronizedMap(Map)