Package org.moeaframework.util.tree

Class Constant

java.lang.Object

org.moeaframework.util.tree.Node

org.moeaframework.util.tree.Constant

All Implemented Interfaces:

Serializable

public class Constant
extends Node

The node for defining a constant value.

Node signature:

Name	Type	Description
Return Value	Number	The constant value

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
Constant(boolean value)	Constructs a new node for defining a constant boolean value.
Constant(double value)	Constructs a new node for defining a constant floating-point number.
Constant(long value)	Constructs a new node for defining a constant integer value.
Constant(Class<?> type, Object value)	Constructs a new node for defining a constant Object.

Method Summary

Modifier and Type	Method	Description
Constant	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.
String	toString()

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

Methods inherited from class java.lang.Object

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

Constructor Details

Constant

public Constant(double value)

Constructs a new node for defining a constant floating-point number.

Parameters:

value - the floating-point number

Constant

public Constant(long value)

Constructs a new node for defining a constant integer value.

Parameters:

value - the integer value

Constant

public Constant(boolean value)

Constructs a new node for defining a constant boolean value.

Parameters:

value - the boolean value

Constant

public Constant(Class<?> type,
 Object value)

Constructs a new node for defining a constant Object. It is necessary to pass the type explicitly to ensure values such as null are handled correctly.

Parameters:

type - the type of the object

value - the object

Method Details

copyNode

public Constant 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

toString

public String toString()

Overrides:

toString in class Node