Package it.unimi.dsi.fastutil.longs

Class Long2ObjectMaps.EmptyMap<V>

java.lang.Object
it.unimi.dsi.fastutil.longs.AbstractLong2ObjectFunction<V>
it.unimi.dsi.fastutil.longs.Long2ObjectFunctions.EmptyFunction<V>
it.unimi.dsi.fastutil.longs.Long2ObjectMaps.EmptyMap<V>
All Implemented Interfaces:
Function<java.lang.Long,​V>, Long2ObjectFunction<V>, Long2ObjectMap<V>, java.io.Serializable, java.lang.Cloneable, java.util.function.Function<java.lang.Long,​V>, java.util.function.LongFunction<V>, java.util.Map<java.lang.Long,​V>
Direct Known Subclasses:
Long2ObjectSortedMaps.EmptySortedMap
Enclosing class:
Long2ObjectMaps
public static class Long2ObjectMaps.EmptyMap<V>
extends Long2ObjectFunctions.EmptyFunction<V>
implements Long2ObjectMap<V>, java.io.Serializable, java.lang.Cloneable
An immutable class representing an empty type-specific map.

This class may be useful to implement your own in case you subclass a type-specific map.

See Also:
Serialized Form

  • Method Details

    • containsValue

      public boolean containsValue​(java.lang.Object v)
      Specified by:
      containsValue in interface java.util.Map<java.lang.Long,​V>

    • getOrDefault

      @Deprecated public V getOrDefault​(java.lang.Object key, V defaultValue)
      Deprecated.
      Description copied from interface: Long2ObjectMap
      Returns the value associated by this function to the specified key, or give the specified value if not present.

      This default implementation just delegates to the corresponding Map method.

      Specified by:
      getOrDefault in interface Function<java.lang.Long,​V>
      Specified by:
      getOrDefault in interface Long2ObjectFunction<V>
      Specified by:
      getOrDefault in interface Long2ObjectMap<V>
      Specified by:
      getOrDefault in interface java.util.Map<java.lang.Long,​V>
      Parameters:
      key - the key.
      defaultValue - the default value to return if not present.
      Returns:
      the corresponding value, or defaultValue if no value was present for the given key.
      See Also:
      Map.getOrDefault(Object, Object)

    • getOrDefault

      public V getOrDefault​(long key, V defaultValue)
      Description copied from interface: Long2ObjectFunction
      Returns the value associated by this function to the specified key, or give the specified value if not present.
      Specified by:
      getOrDefault in interface Long2ObjectFunction<V>
      Specified by:
      getOrDefault in interface Long2ObjectMap<V>
      Overrides:
      getOrDefault in class Long2ObjectFunctions.EmptyFunction<V>
      Parameters:
      key - the key.
      defaultValue - the value to return if not present.
      Returns:
      the corresponding value, or defaultValue if no value was present for the given key.
      See Also:
      Function.getOrDefault(Object, Object)

    • putAll

      public void putAll​(java.util.Map<? extends java.lang.Long,​? extends V> m)
      Specified by:
      putAll in interface java.util.Map<java.lang.Long,​V>

    • long2ObjectEntrySet

      public ObjectSet<Long2ObjectMap.Entry<V>> long2ObjectEntrySet()
      Description copied from interface: Long2ObjectMap
      Returns a type-specific set view of the mappings contained in this map.

      This method is necessary because there is no inheritance along type parameters: it is thus impossible to strengthen Map.entrySet() so that it returns an ObjectSet of type-specific entries (the latter makes it possible to access keys and values with type-specific methods).

      Specified by:
      long2ObjectEntrySet in interface Long2ObjectMap<V>
      Returns:
      a type-specific set view of the mappings contained in this map.
      See Also:
      Map.entrySet()

    • keySet

      public LongSet keySet()
      Description copied from interface: Long2ObjectMap
      Specified by:
      keySet in interface Long2ObjectMap<V>
      Specified by:
      keySet in interface java.util.Map<java.lang.Long,​V>
      Returns:
      a set view of the keys contained in this map.
      See Also:
      Map.keySet()

    • values

      public ObjectCollection<V> values()
      Description copied from interface: Long2ObjectMap
      Specified by:
      values in interface Long2ObjectMap<V>
      Specified by:
      values in interface java.util.Map<java.lang.Long,​V>
      Returns:
      a set view of the values contained in this map.
      See Also:
      Map.values()

    • forEach

      public void forEach​(java.util.function.BiConsumer<? super java.lang.Long,​? super V> consumer)
      Specified by:
      forEach in interface Long2ObjectMap<V>
      Specified by:
      forEach in interface java.util.Map<java.lang.Long,​V>

    • clone

      public java.lang.Object clone()
      Overrides:
      clone in class Long2ObjectFunctions.EmptyFunction<V>

    • isEmpty

      public boolean isEmpty()
      Specified by:
      isEmpty in interface java.util.Map<java.lang.Long,​V>

    • hashCode

      public int hashCode()
      Specified by:
      hashCode in interface java.util.Map<java.lang.Long,​V>
      Overrides:
      hashCode in class Long2ObjectFunctions.EmptyFunction<V>

    • equals

      public boolean equals​(java.lang.Object o)
      Specified by:
      equals in interface java.util.Map<java.lang.Long,​V>
      Overrides:
      equals in class Long2ObjectFunctions.EmptyFunction<V>

    • toString

      public java.lang.String toString()
      Overrides:
      toString in class Long2ObjectFunctions.EmptyFunction<V>