org.moeaframework.core.variable
Class Program

java.lang.Object
  org.moeaframework.util.tree.Node
      org.moeaframework.core.variable.Program

All Implemented Interfaces:

Serializable, Variable

public class Program
extends Node
implements Variable

A decision variable for programs. The program is represented as a strongly-typed expression tree.

Note: Although Program extends Node, the Program object must never be altered by the optimization algorithm. Only its arguments can undergo variation.

See Also:

Serialized Form

Constructor Summary

Program(Rules rules)
Constructs a new program variable with the specified syntax rules.

Method Summary

Program	copy() Returns an independent copy of this decision variable.
Program	copyNode() Returns a copy of this node, but without any children or parents assigned.
Object	evaluate(Environment environment) Evaluates this node in the context of the specified environment.
Rules	getRules() Returns the rules defining the program syntax.

Methods inherited from class org.moeaframework.util.tree.Node

copyTree, getArgument, getArgumentType, getDepth, getFunctionAt, getFunctionAt, getMaximumHeight, getMinimumHeight, getNodeAt, getNodeAt, getNodeAt, getNumberOfArguments, getNumberOfFunctions, getNumberOfFunctions, getNumberOfNodes, getNumberOfNodes, getNumberOfNodes, getNumberOfTerminals, getNumberOfTerminals, getParent, getReturnType, getTerminalAt, getTerminalAt, isFixed, isTerminal, isValid, setArgument, setFixed, setFixedTree, size, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

Program

public Program(Rules rules)

Constructs a new program variable with the specified syntax rules.

Parameters:

rules - the rules defining the program syntax

Method Detail

getRules

public Rules getRules()

Returns the rules defining the program syntax.

Returns:

the rules defining the program syntax

copy

public Program copy()

Description copied from interface: Variable

Returns an independent copy of this decision variable. It is required that x.copy() is completely independent from x. This means any method invoked on x.copy() in no way alters the state of x and vice versa. It is typically the case that x.copy().getClass() == x.getClass() and x.copy().equals(x).

Specified by:

copy in interface Variable

Returns:

an independent copy of this decision variable

copyNode

public Program copyNode()

Description copied from class: Node

Returns a copy of this node, but without any children or parents assigned.

Specified by:

copyNode in class Node

Returns:

a copy of this node, but without any children or parents assigned

evaluate

public Object evaluate(Environment environment)

Description copied from class: Node

Evaluates this node in the context of the specified environment.

Specified by:

evaluate in class Node

Parameters:

environment - the execution environment

Returns:

the result of evaluating this node