it.unimi.dsi.fastutil.longs

Class AbstractLong2LongFunction

java.lang.Object

it.unimi.dsi.fastutil.longs.AbstractLong2LongFunction

All Implemented Interfaces:

Long2LongFunction, Serializable, Function<Long,Long>, LongUnaryOperator

Direct Known Subclasses:

AbstractLong2LongMap, Long2LongFunctions.EmptyFunction, Long2LongFunctions.Singleton, Long2LongFunctions.UnmodifiableFunction

public abstract class AbstractLong2LongFunction
extends Object
implements Long2LongFunction, 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

Field Summary

Fields

Modifier and Type	Field and Description
protected long	defRetValue The default return value for get(), put() and remove().

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractLong2LongFunction()

Method Summary

Modifier and Type	Method and Description
long	defaultReturnValue() Gets the default return value.
void	defaultReturnValue(long rv) Sets the default return value (optional operation).

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface it.unimi.dsi.fastutil.longs.Long2LongFunction

applyAsLong, containsKey, containsKey, get, get, put, put, remove, remove

Methods inherited from interface it.unimi.dsi.fastutil.Function

apply, clear, size

Methods inherited from interface java.util.function.Function

andThen, compose, identity

Methods inherited from interface java.util.function.LongUnaryOperator

andThen, compose, identity

Field Detail

defRetValue

protected long defRetValue

The default return value for get(), put() and remove().

Constructor Detail

AbstractLong2LongFunction

protected AbstractLong2LongFunction()

Method Detail

defaultReturnValue

public void defaultReturnValue(long rv)

Description copied from interface: Long2LongFunction

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 Long2LongFunction

Parameters:

rv - the new default return value.

See Also:

Long2LongFunction.defaultReturnValue()

defaultReturnValue

public long defaultReturnValue()

Description copied from interface: Long2LongFunction

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 Long2LongFunction

Returns:

the current default return value.