Package org.moeaframework.problem

Class ProblemStub

java.lang.Object

org.moeaframework.problem.AbstractProblem

org.moeaframework.problem.ProblemStub

All Implemented Interfaces:

AutoCloseable, Named, Problem

public class ProblemStub
extends AbstractProblem

A problem "stub" that is typically used when processing data files when the specific problem type is unknown. It can be configured with specific variable, objective, and constraint types, if known. However, if specific types are not provided, functionality may be limited and can result in exceptions.

Field Summary

Fields inherited from class org.moeaframework.problem.AbstractProblem

numberOfConstraints, numberOfObjectives, numberOfVariables

Constructor Summary

Constructors

Constructor	Description
ProblemStub(int numberOfObjectives)	Constructs a problem stub with the specified number of objectives.
ProblemStub(String name, int numberOfVariables, int numberOfObjectives, int numberOfConstraints)	Constructs a problem stub with the specified number of variables, objectives, and constraints.
ProblemStub(String name, Solution solution)	Constructs a problem stub from the given solution.
ProblemStub(Solution solution)	Constructs a problem stub from the given solution.

Method Summary

Modifier and Type	Method	Description
void	evaluate(Solution solution)	Evaluates the solution, updating the solution's objectives in place.
String	getName()	Returns the name of this problem.
Solution	newSolution()	Returns a new solution for this problem.
void	setConstraintDefinition(int index, Constraint constraint)	Sets the specific constraint type, if known.
void	setObjectiveDefinition(int index, Objective objective)	Sets the specific objective type, if known.
void	setVariableDefinition(int index, Variable variable)	Sets the specific variable type, if known.

Methods inherited from class org.moeaframework.problem.AbstractProblem

close, getNumberOfConstraints, getNumberOfObjectives, getNumberOfVariables

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.moeaframework.problem.Problem

isType

Constructor Details

ProblemStub

public ProblemStub(int numberOfObjectives)

Constructs a problem stub with the specified number of objectives.

Parameters:

numberOfObjectives - the number of objectives

ProblemStub

public ProblemStub(String name,
 int numberOfVariables,
 int numberOfObjectives,
 int numberOfConstraints)

Constructs a problem stub with the specified number of variables, objectives, and constraints.

Parameters:

name - the problem name

numberOfVariables - the number of variables

numberOfObjectives - the number of objectives

numberOfConstraints - the number of constraints

ProblemStub

public ProblemStub(Solution solution)

Constructs a problem stub from the given solution.

Parameters:

solution - a sample or prototype solution for the problem

ProblemStub

public ProblemStub(String name,
 Solution solution)

Constructs a problem stub from the given solution.

Parameters:

name - the problem name

solution - a sample or prototype solution for the problem

Method Details

getName

public String getName()

Description copied from interface: Problem

Returns the name of this problem. Whenever possible, this name should match the name recognized by ProblemFactory.

Returns:

the name of this problem

setVariableDefinition

public void setVariableDefinition(int index,
 Variable variable)

Sets the specific variable type, if known.

Parameters:

index - the index

variable - the variable

setObjectiveDefinition

public void setObjectiveDefinition(int index,
 Objective objective)

Sets the specific objective type, if known.

Parameters:

index - the index

objective - the objective

setConstraintDefinition

public void setConstraintDefinition(int index,
 Constraint constraint)

Sets the specific constraint type, if known.

Parameters:

index - the index

constraint - the constraint

evaluate

public void evaluate(Solution solution)

Description copied from interface: Problem

Evaluates the solution, updating the solution's objectives in place. Algorithms must explicitly call this method when appropriate to evaluate new solutions or reevaluate modified solutions.

Parameters:

solution - the solution to be evaluated

newSolution

public Solution newSolution()

Description copied from interface: Problem

Returns a new solution for this problem. Implementations must initialize the variables so that the valid range of values is defined, but typically leave the actual value at a default or undefined state.

Returns:

a new solution for this problem