Package it.unimi.dsi.fastutil.doubles

Class Double2DoubleMaps.EmptyMap

java.lang.Object
it.unimi.dsi.fastutil.doubles.AbstractDouble2DoubleFunction
it.unimi.dsi.fastutil.doubles.Double2DoubleFunctions.EmptyFunction
it.unimi.dsi.fastutil.doubles.Double2DoubleMaps.EmptyMap
All Implemented Interfaces:
Double2DoubleFunction, Double2DoubleMap, Function<java.lang.Double,​java.lang.Double>, java.io.Serializable, java.lang.Cloneable, java.util.function.DoubleUnaryOperator, java.util.function.Function<java.lang.Double,​java.lang.Double>, java.util.Map<java.lang.Double,​java.lang.Double>
Direct Known Subclasses:
Double2DoubleSortedMaps.EmptySortedMap
Enclosing class:
Double2DoubleMaps
public static class Double2DoubleMaps.EmptyMap
extends Double2DoubleFunctions.EmptyFunction
implements Double2DoubleMap, 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​(double v)
      Description copied from interface: Double2DoubleMap
      Returns true if this map maps one or more keys to the specified value.
      Specified by:
      containsValue in interface Double2DoubleMap
      See Also:
      Map.containsValue(Object)

    • getOrDefault

      @Deprecated public java.lang.Double getOrDefault​(java.lang.Object key, java.lang.Double defaultValue)
      Deprecated.
      Description copied from interface: Double2DoubleMap
      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 Double2DoubleFunction
      Specified by:
      getOrDefault in interface Double2DoubleMap
      Specified by:
      getOrDefault in interface Function<java.lang.Double,​java.lang.Double>
      Specified by:
      getOrDefault in interface java.util.Map<java.lang.Double,​java.lang.Double>
      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 double getOrDefault​(double key, double defaultValue)
      Description copied from interface: Double2DoubleFunction
      Returns the value associated by this function to the specified key, or give the specified value if not present.
      Specified by:
      getOrDefault in interface Double2DoubleFunction
      Specified by:
      getOrDefault in interface Double2DoubleMap
      Overrides:
      getOrDefault in class Double2DoubleFunctions.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 Double2DoubleMap
      Specified by:
      containsValue in interface java.util.Map<java.lang.Double,​java.lang.Double>

    • putAll

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

    • double2DoubleEntrySet

      public ObjectSet<Double2DoubleMap.Entry> double2DoubleEntrySet()
      Description copied from interface: Double2DoubleMap
      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:
      double2DoubleEntrySet in interface Double2DoubleMap
      Returns:
      a type-specific set view of the mappings contained in this map.
      See Also:
      Map.entrySet()

    • keySet

      public DoubleSet keySet()
      Description copied from interface: Double2DoubleMap
      Specified by:
      keySet in interface Double2DoubleMap
      Specified by:
      keySet in interface java.util.Map<java.lang.Double,​java.lang.Double>
      Returns:
      a set view of the keys contained in this map.
      See Also:
      Map.keySet()

    • values

      public DoubleCollection values()
      Description copied from interface: Double2DoubleMap
      Specified by:
      values in interface Double2DoubleMap
      Specified by:
      values in interface java.util.Map<java.lang.Double,​java.lang.Double>
      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.Double,​? super java.lang.Double> consumer)
      Specified by:
      forEach in interface Double2DoubleMap
      Specified by:
      forEach in interface java.util.Map<java.lang.Double,​java.lang.Double>

    • clone

      public java.lang.Object clone()
      Overrides:
      clone in class Double2DoubleFunctions.EmptyFunction

    • isEmpty

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

    • hashCode

      public int hashCode()
      Specified by:
      hashCode in interface java.util.Map<java.lang.Double,​java.lang.Double>
      Overrides:
      hashCode in class Double2DoubleFunctions.EmptyFunction

    • equals

      public boolean equals​(java.lang.Object o)
      Specified by:
      equals in interface java.util.Map<java.lang.Double,​java.lang.Double>
      Overrides:
      equals in class Double2DoubleFunctions.EmptyFunction

    • toString

      public java.lang.String toString()
      Overrides:
      toString in class Double2DoubleFunctions.EmptyFunction