Package it.unimi.dsi.fastutil.objects

Class Reference2LongMaps.EmptyMap<K>

java.lang.Object
it.unimi.dsi.fastutil.objects.AbstractReference2LongFunction<K>
it.unimi.dsi.fastutil.objects.Reference2LongFunctions.EmptyFunction<K>
it.unimi.dsi.fastutil.objects.Reference2LongMaps.EmptyMap<K>
All Implemented Interfaces:
Function<K,​java.lang.Long>, Reference2LongFunction<K>, Reference2LongMap<K>, java.io.Serializable, java.lang.Cloneable, java.util.function.Function<K,​java.lang.Long>, java.util.function.ToLongFunction<K>, java.util.Map<K,​java.lang.Long>
Direct Known Subclasses:
Reference2LongSortedMaps.EmptySortedMap
Enclosing class:
Reference2LongMaps
public static class Reference2LongMaps.EmptyMap<K>
extends Reference2LongFunctions.EmptyFunction<K>
implements Reference2LongMap<K>, 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​(long v)
      Description copied from interface: Reference2LongMap
      Returns true if this map maps one or more keys to the specified value.
      Specified by:
      containsValue in interface Reference2LongMap<K>
      See Also:
      Map.containsValue(Object)

    • getOrDefault

      @Deprecated public java.lang.Long getOrDefault​(java.lang.Object key, java.lang.Long defaultValue)
      Deprecated.
      Description copied from interface: Reference2LongMap
      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<K,​java.lang.Long>
      Specified by:
      getOrDefault in interface java.util.Map<K,​java.lang.Long>
      Specified by:
      getOrDefault in interface Reference2LongFunction<K>
      Specified by:
      getOrDefault in interface Reference2LongMap<K>
      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 long getOrDefault​(java.lang.Object key, long defaultValue)
      Description copied from interface: Reference2LongFunction
      Returns the value associated by this function to the specified key, or give the specified value if not present.
      Specified by:
      getOrDefault in interface Reference2LongFunction<K>
      Specified by:
      getOrDefault in interface Reference2LongMap<K>
      Overrides:
      getOrDefault in class Reference2LongFunctions.EmptyFunction<K>
      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)

    • containsValue

      @Deprecated public boolean containsValue​(java.lang.Object ov)
      Deprecated.
      Please use the corresponding type-specific method instead.
      Specified by:
      containsValue in interface java.util.Map<K,​java.lang.Long>
      Specified by:
      containsValue in interface Reference2LongMap<K>

    • putAll

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

    • reference2LongEntrySet

      public ObjectSet<Reference2LongMap.Entry<K>> reference2LongEntrySet()
      Description copied from interface: Reference2LongMap
      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:
      reference2LongEntrySet in interface Reference2LongMap<K>
      Returns:
      a type-specific set view of the mappings contained in this map.
      See Also:
      Map.entrySet()

    • keySet

      public ReferenceSet<K> keySet()
      Description copied from interface: Reference2LongMap
      Specified by:
      keySet in interface java.util.Map<K,​java.lang.Long>
      Specified by:
      keySet in interface Reference2LongMap<K>
      Returns:
      a set view of the keys contained in this map.
      See Also:
      Map.keySet()

    • values

      public LongCollection values()
      Description copied from interface: Reference2LongMap
      Specified by:
      values in interface java.util.Map<K,​java.lang.Long>
      Specified by:
      values in interface Reference2LongMap<K>
      Returns:
      a set view of the values contained in this map.
      See Also:
      Map.values()

    • forEach

      public void forEach​(java.util.function.BiConsumer<? super K,​? super java.lang.Long> consumer)
      Specified by:
      forEach in interface java.util.Map<K,​java.lang.Long>
      Specified by:
      forEach in interface Reference2LongMap<K>

    • clone

      public java.lang.Object clone()
      Overrides:
      clone in class Reference2LongFunctions.EmptyFunction<K>

    • isEmpty

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

    • hashCode

      public int hashCode()
      Specified by:
      hashCode in interface java.util.Map<K,​java.lang.Long>
      Overrides:
      hashCode in class Reference2LongFunctions.EmptyFunction<K>

    • equals

      public boolean equals​(java.lang.Object o)
      Specified by:
      equals in interface java.util.Map<K,​java.lang.Long>
      Overrides:
      equals in class Reference2LongFunctions.EmptyFunction<K>

    • toString

      public java.lang.String toString()
      Overrides:
      toString in class Reference2LongFunctions.EmptyFunction<K>