org.oakgp.function.choice

Class OrElse

java.lang.Object

org.oakgp.function.choice.OrElse

All Implemented Interfaces:

Function

public final class OrElse
extends Object
implements Function

Returns the first argument if not null, else returns the second argument.

Constructor Summary

Constructors

Constructor and Description
OrElse(Type type) Constructs a selection operator that returns values of the specified type.

Method Summary

Modifier and Type	Method and Description
Object	evaluate(Arguments arguments, Assignments assignments) Returns the result of applying this operation to the specified Arguments and Assignments.
Signature	getSignature() Returns the return type and argument types associated with this function.
Node	simplify(Arguments arguments) Attempts to find a simplified alternative to applying this function to the specified arguments.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.oakgp.function.Function

getDisplayName, isPure

Constructor Detail

OrElse

public OrElse(Type type)

Constructs a selection operator that returns values of the specified type.

Method Detail

evaluate

public Object evaluate(Arguments arguments,
                       Assignments assignments)

Description copied from interface: Function

Returns the result of applying this operation to the specified Arguments and Assignments.

Specified by:

evaluate in interface Function

Parameters:

arguments - represents the arguments to apply to the operation

assignments - represents values assigned to variables belonging to arguments

Returns:

the result of applying this operation to the arguments and assignments

getSignature

public Signature getSignature()

Description copied from interface: Function

Returns the return type and argument types associated with this function.

Specified by:

getSignature in interface Function

simplify

public Node simplify(Arguments arguments)

Description copied from interface: Function

Attempts to find a simplified alternative to applying this function to the specified arguments.

Simplification can occur by replacing expressions with constant values (e.g. replacing (+ 1 1) with 2) or removing redundant branches (e.g. replacing (if (< 2 3) (+ v0 v1) (* v0 v1)) with (+ v0 v1).

Specified by:

simplify in interface Function

Parameters:

arguments - the arguments to be applied to (i.e. evaluated by) this function

Returns:

a simplified version of applying this function to the specified arguments, or null if unable to simplify.

See Also:

NodeSimplifier