Package it.unimi.dsi.fastutil.doubles

Class Double2FloatFunctions.EmptyFunction

java.lang.Object
it.unimi.dsi.fastutil.doubles.AbstractDouble2FloatFunction
it.unimi.dsi.fastutil.doubles.Double2FloatFunctions.EmptyFunction
All Implemented Interfaces:
Double2FloatFunction, Function<Double,​Float>, Serializable, Cloneable, DoubleUnaryOperator, Function<Double,​Float>
Direct Known Subclasses:
Double2FloatMaps.EmptyMap
Enclosing class:
Double2FloatFunctions
public static class Double2FloatFunctions.EmptyFunction
extends AbstractDouble2FloatFunction
implements Serializable, 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 Details

    • get

      public float get​(double k)
      Description copied from interface: Double2FloatFunction
      Returns the value to which the given key is mapped.
      Specified by:
      get in interface Double2FloatFunction
      Parameters:
      k - the key.
      Returns:
      the corresponding value, or the default return value if no value was present for the given key.
      See Also:
      Function.get(Object)

    • containsKey

      public boolean containsKey​(double k)
      Description copied from interface: Double2FloatFunction
      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. In particular, this default implementation always returns true.

      Specified by:
      containsKey in interface Double2FloatFunction
      Parameters:
      k - the key.
      Returns:
      true if this function associates a value to key.
      See Also:
      Function.containsKey(Object)

    • defaultReturnValue

      public float defaultReturnValue()
      Description copied from interface: Double2FloatFunction
      Gets the default return value.

      This default implementation just return the default null value of the type (null for objects, 0 for scalars, false for Booleans).

      Specified by:
      defaultReturnValue in interface Double2FloatFunction
      Overrides:
      defaultReturnValue in class AbstractDouble2FloatFunction
      Returns:
      the current default return value.

    • defaultReturnValue

      public void defaultReturnValue​(float defRetValue)
      Description copied from interface: Double2FloatFunction
      Sets the default return value (optional operation). This value must be returned by type-specific versions of get(), put() and remove() to denote that the map does not contain the specified key. It must be 0/false/null by default.
      Specified by:
      defaultReturnValue in interface Double2FloatFunction
      Overrides:
      defaultReturnValue in class AbstractDouble2FloatFunction
      Parameters:
      defRetValue - the new default return value.
      See Also:
      Double2FloatFunction.defaultReturnValue()

    • 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<Double,​Float>
      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<Double,​Float>
      See Also:
      Map.clear()

    • clone

      public Object clone()

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object

    • equals

      public boolean equals​(Object o)
      Overrides:
      equals in class Object

    • toString

      public String toString()
      Overrides:
      toString in class Object