Class AbstractLong2IntFunction

java.lang.Object
it.unimi.dsi.fastutil.longs.AbstractLong2IntFunction
All Implemented Interfaces:
Function<java.lang.Long,​java.lang.Integer>, Long2IntFunction, java.io.Serializable, java.util.function.Function<java.lang.Long,​java.lang.Integer>, java.util.function.LongToIntFunction
Direct Known Subclasses:
AbstractLong2IntMap, Long2IntFunctions.EmptyFunction, Long2IntFunctions.Singleton, Long2IntFunctions.UnmodifiableFunction

public abstract class AbstractLong2IntFunction
extends java.lang.Object
implements Long2IntFunction, java.io.Serializable
An abstract class providing basic methods for functions implementing a type-specific interface.

This class handles directly a default return value (including methods to access it). Instances of classes inheriting from this class have just to return defRetValue to denote lack of a key in type-specific methods. The value is serialized.

Implementing subclasses have just to provide type-specific get(), type-specific containsKey(), and size() methods.

See Also:
Serialized Form
  • Method Details

    • defaultReturnValue

      public void defaultReturnValue​(int rv)
      Description copied from interface: Long2IntFunction
      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 Long2IntFunction
      Parameters:
      rv - the new default return value.
      See Also:
      Long2IntFunction.defaultReturnValue()
    • defaultReturnValue

      public int defaultReturnValue()
      Description copied from interface: Long2IntFunction
      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 Long2IntFunction
      Returns:
      the current default return value.