Class Double2ReferenceMaps


  • public final class Double2ReferenceMaps
    extends Object
    A class providing static methods and objects that do useful things with type-specific maps.
    See Also:
    Collections
    • Field Detail

      • EMPTY_MAP

        public static final Double2ReferenceMaps.EmptyMap EMPTY_MAP
        An empty type-specific map (immutable). It is serializable and cloneable.
    • Method Detail

      • fastIterator

        public static <V> ObjectIterator<Double2ReferenceMap.Entry<V>> fastIterator​(Double2ReferenceMap<V> map)
        Returns an iterator that will be fast, if possible, on the entry set of the provided map.
        Parameters:
        map - a map from which we will try to extract a (fast) iterator on the entry set.
        Returns:
        an iterator on the entry set of the given map that will be fast, if possible.
        Since:
        8.0.0
      • fastIterable

        public static <V> ObjectIterable<Double2ReferenceMap.Entry<V>> fastIterable​(Double2ReferenceMap<V> map)
        Returns an iterable yielding an iterator that will be fast, if possible, on the entry set of the provided map.
        Parameters:
        map - a map from which we will try to extract an iterable yielding a (fast) iterator on the entry set.
        Returns:
        an iterable yielding an iterator on the entry set of the given map that will be fast, if possible.
        Since:
        8.0.0
      • emptyMap

        public static <V> Double2ReferenceMap<V> emptyMap()
        Returns an empty map (immutable). It is serializable and cloneable.

        This method provides a typesafe access to EMPTY_MAP.

        Returns:
        an empty map (immutable).
      • singleton

        public static <V> Double2ReferenceMap<V> singleton​(double key,
                                                           V 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 &lt;key,value&gt;.
      • singleton

        public static <V> Double2ReferenceMap<V> singleton​(Double key,
                                                           V 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 &lt;key,value&gt;.
      • synchronize

        public static <V> Double2ReferenceMap<V> synchronize​(Double2ReferenceMap<V> 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)