Class Object2LongFunctions.EmptyFunction<K>

  • All Implemented Interfaces:
    Function<K,​java.lang.Long>, Object2LongFunction<K>, java.io.Serializable, java.lang.Cloneable, java.util.function.Function<K,​java.lang.Long>, java.util.function.ToLongFunction<K>
    Direct Known Subclasses:
    Object2LongMaps.EmptyMap
    Enclosing class:
    Object2LongFunctions

    public static class Object2LongFunctions.EmptyFunction<K>
    extends AbstractObject2LongFunction<K>
    implements java.io.Serializable, java.lang.Cloneable
    An immutable class representing an empty type-specific function.

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

    See Also:
    Serialized Form
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void clear()
      Removes all associations from this function (optional operation).
      java.lang.Object clone()  
      boolean containsKey​(java.lang.Object k)
      Returns true if this function contains a mapping for the specified key.
      long defaultReturnValue()
      Gets the default return value.
      void defaultReturnValue​(long defRetValue)
      Sets the default return value (optional operation).
      boolean equals​(java.lang.Object o)  
      long getLong​(java.lang.Object k)
      Returns the value to which the given key is mapped.
      int hashCode()  
      int size()
      Returns the intended number of keys in this function, or -1 if no such number exists.
      java.lang.String toString()  
      • Methods inherited from class java.lang.Object

        getClass, notify, notifyAll, wait, wait, wait
      • Methods inherited from interface it.unimi.dsi.fastutil.Function

        apply
      • Methods inherited from interface java.util.function.Function

        andThen, compose
    • Method Detail

      • containsKey

        public boolean containsKey​(java.lang.Object k)
        Description copied from interface: Function
        Returns true if this function contains a mapping for the specified key.

        Note that for some kind of functions (e.g., hashes) this method will always return true. This default implementation, in particular, always return true.

        Specified by:
        containsKey in interface Function<K,​java.lang.Long>
        Parameters:
        k - the key.
        Returns:
        true if this function associates a value to key.
        See Also:
        Map.containsKey(Object)
      • size

        public int size()
        Description copied from interface: Function
        Returns the intended number of keys in this function, or -1 if no such number exists.

        Most function implementations will have some knowledge of the intended number of keys in their domain. In some cases, however, this might not be possible. This default implementation, in particular, returns -1.

        Specified by:
        size in interface Function<K,​java.lang.Long>
        Returns:
        the intended number of keys in this function, or -1 if that number is not available.
      • clear

        public void clear()
        Description copied from interface: Function
        Removes all associations from this function (optional operation).
        Specified by:
        clear in interface Function<K,​java.lang.Long>
        See Also:
        Map.clear()
      • clone

        public java.lang.Object clone()
      • hashCode

        public int hashCode()
        Overrides:
        hashCode in class java.lang.Object
      • equals

        public boolean equals​(java.lang.Object o)
        Overrides:
        equals in class java.lang.Object
      • toString

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