it.unimi.dsi.fastutil.doubles
Class Double2ReferenceMaps

java.lang.Object
  it.unimi.dsi.fastutil.doubles.Double2ReferenceMaps

public class Double2ReferenceMaps

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	Double2ReferenceMaps.EmptyMap An immutable class representing an empty type-specific map.
static class	Double2ReferenceMaps.Singleton An immutable class representing a type-specific singleton map.
static class	Double2ReferenceMaps.SynchronizedMap A synchronized wrapper class for maps.

Field Summary

static Double2ReferenceMaps.EmptyMap

EMPTY_MAP An empty type-specific map (immutable).

Method Summary

static Double2ReferenceMap	singleton(double key, Object value) Returns a type-specific immutable map containing only the specified pair.
static Double2ReferenceMap	singleton(Object key, Object value) Returns a type-specific immutable map containing only the specified pair.
static Double2ReferenceMap	synchronize(Double2ReferenceMap m) Returns a synchronized type-specific map backed by the given type-specific map.
static Double2ReferenceMap	synchronize(Double2ReferenceMap 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 Double2ReferenceMaps.EmptyMap EMPTY_MAP

An empty type-specific map (immutable). It is serializable and cloneable.

Method Detail

singleton

public static Double2ReferenceMap singleton(double 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>.

singleton

public static Double2ReferenceMap 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 Double2ReferenceMap synchronize(Double2ReferenceMap 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 Double2ReferenceMap synchronize(Double2ReferenceMap 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)