Class Reference2DoubleFunctions.EmptyFunction<K>

  • All Implemented Interfaces:
    Function<K,​java.lang.Double>, Reference2DoubleFunction<K>, java.io.Serializable, java.lang.Cloneable, java.util.function.Function<K,​java.lang.Double>, java.util.function.ToDoubleFunction<K>
    Direct Known Subclasses:
    Reference2DoubleMaps.EmptyMap
    Enclosing class:
    Reference2DoubleFunctions

    public static class Reference2DoubleFunctions.EmptyFunction<K>
    extends AbstractReference2DoubleFunction<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 Detail

      • getOrDefault

        public double getOrDefault​(java.lang.Object k,
                                   double defaultValue)
        Description copied from interface: Reference2DoubleFunction
        Returns the value associated by this function to the specified key, or give the specified value if not present.
        Specified by:
        getOrDefault in interface Reference2DoubleFunction<K>
        Parameters:
        k - 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)
      • 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.Double>
        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.Double>
        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.Double>
        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