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:
it.unimi.dsi.fastutil.Function<K,​java.lang.Long>, it.unimi.dsi.fastutil.objects.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

      This default implementation just delegates to the corresponding Map method.

      Specified by:
      getOrDefault in interface it.unimi.dsi.fastutil.Function<K,​java.lang.Long>
      Specified by:
      getOrDefault in interface java.util.Map<K,​java.lang.Long>
      Specified by:
      getOrDefault in interface it.unimi.dsi.fastutil.objects.Reference2LongFunction<K>
      Specified by:
      getOrDefault in interface Reference2LongMap<K>

    • getOrDefault

      public long getOrDefault​(java.lang.Object key, long defaultValue)
      Description copied from interface: Reference2LongMap
      Returns the value to which the specified key is mapped, or the defaultValue if this map contains no mapping for the key.
      Specified by:
      getOrDefault in interface it.unimi.dsi.fastutil.objects.Reference2LongFunction<K>
      Specified by:
      getOrDefault in interface Reference2LongMap<K>
      Overrides:
      getOrDefault in class Reference2LongFunctions.EmptyFunction<K>
      Parameters:
      key - the key.
      defaultValue - the default mapping of the key.
      Returns:
      the value to which the specified key is mapped, or the defaultValue if this map contains no mapping for the key.
      See Also:
      Map.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 it.unimi.dsi.fastutil.objects.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 it.unimi.dsi.fastutil.longs.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>