Package it.unimi.dsi.fastutil.longs

Class Long2LongMaps.EmptyMap

java.lang.Object
it.unimi.dsi.fastutil.longs.AbstractLong2LongFunction
it.unimi.dsi.fastutil.longs.Long2LongFunctions.EmptyFunction
it.unimi.dsi.fastutil.longs.Long2LongMaps.EmptyMap
All Implemented Interfaces:
Function<java.lang.Long,​java.lang.Long>, Long2LongFunction, Long2LongMap, java.io.Serializable, java.lang.Cloneable, java.util.function.Function<java.lang.Long,​java.lang.Long>, java.util.function.LongUnaryOperator, java.util.Map<java.lang.Long,​java.lang.Long>
Direct Known Subclasses:
Long2LongSortedMaps.EmptySortedMap
Enclosing class:
Long2LongMaps
public static class Long2LongMaps.EmptyMap
extends Long2LongFunctions.EmptyFunction
implements Long2LongMap, 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: Long2LongMap
      Returns true if this map maps one or more keys to the specified value.
      Specified by:
      containsValue in interface Long2LongMap
      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: Long2LongMap
      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,​java.lang.Long>
      Specified by:
      getOrDefault in interface Long2LongFunction
      Specified by:
      getOrDefault in interface Long2LongMap
      Specified by:
      getOrDefault in interface java.util.Map<java.lang.Long,​java.lang.Long>
      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​(long key, long defaultValue)
      Description copied from interface: Long2LongFunction
      Returns the value associated by this function to the specified key, or give the specified value if not present.
      Specified by:
      getOrDefault in interface Long2LongFunction
      Specified by:
      getOrDefault in interface Long2LongMap
      Overrides:
      getOrDefault in class Long2LongFunctions.EmptyFunction
      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 Long2LongMap
      Specified by:
      containsValue in interface java.util.Map<java.lang.Long,​java.lang.Long>

    • putAll

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

    • long2LongEntrySet

      public ObjectSet<Long2LongMap.Entry> long2LongEntrySet()
      Description copied from interface: Long2LongMap
      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:
      long2LongEntrySet in interface Long2LongMap
      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: Long2LongMap
      Specified by:
      keySet in interface Long2LongMap
      Specified by:
      keySet in interface java.util.Map<java.lang.Long,​java.lang.Long>
      Returns:
      a set view of the keys contained in this map.
      See Also:
      Map.keySet()

    • values

      public LongCollection values()
      Description copied from interface: Long2LongMap
      Specified by:
      values in interface Long2LongMap
      Specified by:
      values in interface java.util.Map<java.lang.Long,​java.lang.Long>
      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 java.lang.Long> consumer)
      Specified by:
      forEach in interface Long2LongMap
      Specified by:
      forEach in interface java.util.Map<java.lang.Long,​java.lang.Long>

    • clone

      public java.lang.Object clone()
      Overrides:
      clone in class Long2LongFunctions.EmptyFunction

    • isEmpty

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

    • hashCode

      public int hashCode()
      Specified by:
      hashCode in interface java.util.Map<java.lang.Long,​java.lang.Long>
      Overrides:
      hashCode in class Long2LongFunctions.EmptyFunction

    • equals

      public boolean equals​(java.lang.Object o)
      Specified by:
      equals in interface java.util.Map<java.lang.Long,​java.lang.Long>
      Overrides:
      equals in class Long2LongFunctions.EmptyFunction

    • toString

      public java.lang.String toString()
      Overrides:
      toString in class Long2LongFunctions.EmptyFunction