it.unimi.dsi.fastutil.doubles

Class AbstractDouble2DoubleFunction

java.lang.Object

it.unimi.dsi.fastutil.doubles.AbstractDouble2DoubleFunction

All Implemented Interfaces:

Double2DoubleFunction, Function<Double,Double>, Serializable

Direct Known Subclasses:

AbstractDouble2DoubleMap, Double2DoubleFunctions.EmptyFunction, Double2DoubleFunctions.Singleton, Double2DoubleFunctions.SynchronizedFunction, Double2DoubleFunctions.UnmodifiableFunction

public abstract class AbstractDouble2DoubleFunction
extends Object
implements Double2DoubleFunction, 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

Field Summary

Fields

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

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractDouble2DoubleFunction()

Method Summary

Methods

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.
double	defaultReturnValue() Gets the default return value.
void	defaultReturnValue(double rv) Sets the default return value.
Double	get(Object ok) Delegates to the corresponding type-specific method, taking care of returning null on a missing key.
double	put(double key, double value) Adds a pair to the map.
Double	put(Double ok, Double ov) Delegates to the corresponding type-specific method, taking care of returning null on a missing key.
double	remove(double key) Removes the mapping with the given key.
Double	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

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

Methods inherited from interface it.unimi.dsi.fastutil.doubles.Double2DoubleFunction

containsKey, get

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

size

Field Detail

serialVersionUID

public static final long serialVersionUID

See Also:

Constant Field Values

defRetValue

protected double defRetValue

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

Constructor Detail

AbstractDouble2DoubleFunction

protected AbstractDouble2DoubleFunction()

Method Detail

defaultReturnValue

public void defaultReturnValue(double rv)

Description copied from interface: Double2DoubleFunction

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 Double2DoubleFunction

Parameters:

rv - the new default return value.

See Also:

Double2DoubleFunction.defaultReturnValue()

defaultReturnValue

public double defaultReturnValue()

Description copied from interface: Double2DoubleFunction

Gets the default return value.

Specified by:

defaultReturnValue in interface Double2DoubleFunction

Returns:

the current default return value.

put

public double put(double key,
         double value)

Description copied from interface: Double2DoubleFunction

Adds a pair to the map.

Specified by:

put in interface Double2DoubleFunction

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 double remove(double key)

Description copied from interface: Double2DoubleFunction

Removes the mapping with the given key.

Specified by:

remove in interface Double2DoubleFunction

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<Double,Double>

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<Double,Double>

Parameters:

ok - the key.

Returns:

true if this function associates a value to key.

See Also:

Map.containsKey(Object)

get

public Double 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<Double,Double>

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 Double put(Double ok,
         Double 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<Double,Double>

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 Double 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<Double,Double>

Returns:

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

See Also:

Map.remove(Object)