org.jenetics.prog.op

Class Const<T>

java.lang.Object

org.jenetics.prog.op.Const<T>

All Implemented Interfaces:

Function<T[],T>, Supplier<Op<T>>, Op<T>

public final class Const<T>
extends Object
implements Op<T>

Represents an operation which always returns the same, constant, value. To improve readability, constants may have a name. If a name is given, this name is used when printing the program tree.

final static Op<Double> PI = Const.of("π", Math.PI); final static Op<Double> ONE = Const.of(1.0);

Since:

3.9

Version:

3.9

Author:

Franz Wilhelmstötter

Method Summary

Modifier and Type	Method and Description
T	apply(T[] value)
int	arity() Return the arity of the operation function.
boolean	equals(Object obj)
int	hashCode()
String	name() Return the name of the operation.
static <T> Const<T>	of(String name, T value) Return a new constant with the given name and value.
static <T> Const<T>	of(T value) Return a new constant with the given value.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.jenetics.prog.op.Op

get, isTerminal, of

Methods inherited from interface java.util.function.Function

andThen, compose, identity

Method Detail

apply

public T apply(T[] value)

Specified by:

apply in interface Function<T[],T>

name

public String name()

Description copied from interface: Op

Return the name of the operation.

Specified by:

name in interface Op<T>

Returns:

the name of the operation

arity

public int arity()

Description copied from interface: Op

Return the arity of the operation function. If the arity is zero, the operation is terminal operation.

Specified by:

arity in interface Op<T>

Returns:

the arity of the operation

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object

of

public static <T> Const<T> of(String name,
                              T value)

Return a new constant with the given name and value.

Type Parameters:

T - the constant type

Parameters:

name - the constant name

value - the constant value

Returns:

a new constant

Throws:

NullPointerException - if the given constant name is null

of

public static <T> Const<T> of(T value)

Return a new constant with the given value.

Type Parameters:

T - the constant type

Parameters:

value - the constant value

Returns:

a new constant