it.unimi.dsi.fastutil.ints

Class AbstractInt2ObjectFunction<V>

java.lang.Object

it.unimi.dsi.fastutil.ints.AbstractInt2ObjectFunction<V>

All Implemented Interfaces:

Function<Integer,V>, Int2ObjectFunction<V>, Serializable

Direct Known Subclasses:

AbstractInt2ObjectMap, Int2ObjectFunctions.EmptyFunction, Int2ObjectFunctions.Singleton, Int2ObjectFunctions.SynchronizedFunction, Int2ObjectFunctions.UnmodifiableFunction

public abstract class AbstractInt2ObjectFunction<V>
extends Object
implements Int2ObjectFunction<V>, Serializable

An abstract class providing basic methods for functions implementing a type-specific interface.

Optional operations just throw an UnsupportedOperationException. Generic versions of accessors delegate to the corresponding type-specific counterparts following the interface rules (they take care of returning null on a missing key).

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 Summary

Modifier and Type	Method and Description
void	clear() Removes all associations from this function (optional operation).
boolean	containsKey(Object ok) Returns true if this function contains a mapping for the specified key.
V	defaultReturnValue() Gets the default return value.
void	defaultReturnValue(V rv) Sets the default return value.
V	get(Object ok) Delegates to the corresponding type-specific method, taking care of returning null on a missing key.
V	put(Integer ok, V ov) Delegates to the corresponding type-specific method, taking care of returning null on a missing key.
V	put(int key, V value) Adds a pair to the map.
V	remove(int key) Removes the mapping with the given key.
V	remove(Object ok) Delegates to the corresponding type-specific method, taking care of returning null on a missing key.

Methods inherited from class java.lang.Object

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

Methods inherited from interface it.unimi.dsi.fastutil.ints.Int2ObjectFunction

containsKey, get

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

size

Method Detail

defaultReturnValue

public void defaultReturnValue(V rv)

Description copied from interface: Int2ObjectFunction

Sets the default return value. 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 Int2ObjectFunction<V>

Parameters:

rv - the new default return value.

See Also:

Int2ObjectFunction.defaultReturnValue()

defaultReturnValue

public V defaultReturnValue()

Description copied from interface: Int2ObjectFunction

Gets the default return value.

Specified by:

defaultReturnValue in interface Int2ObjectFunction<V>

Returns:

the current default return value.

put

public V put(int key,
             V value)

Description copied from interface: Int2ObjectFunction

Adds a pair to the map.

Specified by:

put in interface Int2ObjectFunction<V>

Parameters:

key - the key.

value - the value.

Returns:

the old value, or the default return value if no value was present for the given key.

See Also:

Function.put(Object,Object)

remove

public V remove(int key)

Description copied from interface: Int2ObjectFunction

Removes the mapping with the given key.

Specified by:

remove in interface Int2ObjectFunction<V>

Parameters:

key - the key.

Returns:

the old value, or the default return value if no value was present for the given key.

See Also:

Function.remove(Object)

clear

public void clear()

Description copied from interface: Function

Removes all associations from this function (optional operation).

Specified by:

clear in interface Function<Integer,V>

See Also:

Map.clear()

containsKey

public boolean containsKey(Object ok)

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.

Specified by:

containsKey in interface Function<Integer,V>

Parameters:

ok - the key.

Returns:

true if this function associates a value to key.

See Also:

Map.containsKey(Object)

get

public V get(Object ok)

Delegates to the corresponding type-specific method, taking care of returning null on a missing key.

This method must check whether the provided key is in the map using containsKey(). Thus, it probes the map twice. Implementors of subclasses should override it with a more efficient method.

Specified by:

get in interface Function<Integer,V>

Parameters:

ok - the key.

Returns:

the corresponding value, or null if no value was present for the given key.

See Also:

Map.get(Object)

put

public V put(Integer ok,
             V ov)

Delegates to the corresponding type-specific method, taking care of returning null on a missing key.

This method must check whether the provided key is in the map using containsKey(). Thus, it probes the map twice. Implementors of subclasses should override it with a more efficient method.

Specified by:

put in interface Function<Integer,V>

Parameters:

ok - the key.

ov - the value.

Returns:

the old value, or null if no value was present for the given key.

See Also:

Map.put(Object,Object)

remove

public V remove(Object ok)

Delegates to the corresponding type-specific method, taking care of returning null on a missing key.

This method must check whether the provided key is in the map using containsKey(). Thus, it probes the map twice. Implementors of subclasses should override it with a more efficient method.

Specified by:

remove in interface Function<Integer,V>

Parameters:

ok - the key.

Returns:

the old value, or null if no value was present for the given key.

See Also:

Map.remove(Object)