org.oakgp.primitive

Class PrimitiveSetImpl

java.lang.Object

org.oakgp.primitive.PrimitiveSetImpl

All Implemented Interfaces:

PrimitiveSet

public final class PrimitiveSetImpl
extends Object
implements PrimitiveSet

Represents the range of possible functions and terminal nodes to use during a genetic programming run.

Constructor Summary

Constructors

Constructor and Description
PrimitiveSetImpl(FunctionSet functionSet, ConstantSet constantSet, VariableSet variableSet, Random random, double ratioVariables) Constructs a new primitive set consisting of the specified components.

Method Summary

Modifier and Type	Method and Description
boolean	hasFunctions(Type type) Returns true if the primitive set contains at least one function which has a return type of the specified type, else false.
boolean	hasTerminals(Type type) Returns true if the primitive set contains at least one terminal node of the specified type, else false.
Function	nextAlternativeFunction(Function current) Returns a randomly selected Function that is not the same as the specified Function.
Node	nextAlternativeTerminal(Node current) Returns a randomly selected terminal node that is not the same as the specified Node.
Function	nextFunction(Type type) Returns a randomly selected Function of the specified Type.
Node	nextTerminal(Type type) Returns a randomly selected terminal node.

Methods inherited from class java.lang.Object

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

Constructor Detail

PrimitiveSetImpl

public PrimitiveSetImpl(FunctionSet functionSet,
                        ConstantSet constantSet,
                        VariableSet variableSet,
                        Random random,
                        double ratioVariables)

Constructs a new primitive set consisting of the specified components.

Parameters:

functionSet - the set of possible functions to use in the construction of programs

constantSet - the set of possible constants to use in the construction of programs

variableSet - the set of possible variables to use in the construction of programs

random - used to randomly select components to use in the construction of programs

ratioVariables - a value in the range 0 to 1 (inclusive) which specifies the proportion of terminal nodes that should represent variables, rather than constants

Method Detail

hasTerminals

public boolean hasTerminals(Type type)

Description copied from interface: PrimitiveSet

Returns true if the primitive set contains at least one terminal node of the specified type, else false.

Specified by:

hasTerminals in interface PrimitiveSet

hasFunctions

public boolean hasFunctions(Type type)

Description copied from interface: PrimitiveSet

Returns true if the primitive set contains at least one function which has a return type of the specified type, else false.

Specified by:

hasFunctions in interface PrimitiveSet

nextTerminal

public Node nextTerminal(Type type)

Returns a randomly selected terminal node.

Specified by:

nextTerminal in interface PrimitiveSet

Returns:

a randomly selected terminal node

nextAlternativeTerminal

public Node nextAlternativeTerminal(Node current)

Returns a randomly selected terminal node that is not the same as the specified Node.

Specified by:

nextAlternativeTerminal in interface PrimitiveSet

Parameters:

current - the current Node that the returned result should be an alternative to (i.e. not the same as)

Returns:

a randomly selected terminal node that is not the same as the specified Node

nextFunction

public Function nextFunction(Type type)

Returns a randomly selected Function of the specified Type.

Specified by:

nextFunction in interface PrimitiveSet

Parameters:

type - the required return type of the Function

Returns:

a randomly selected Function with a return type of type

nextAlternativeFunction

public Function nextAlternativeFunction(Function current)

Returns a randomly selected Function that is not the same as the specified Function.

Specified by:

nextAlternativeFunction in interface PrimitiveSet

Parameters:

current - the current Function that the returned result should be an alternative to (i.e. not the same as)

Returns:

a randomly selected Function that is not the same as the specified Function