org.moeaframework.util.tree
Class Constant

java.lang.Object
  org.moeaframework.util.tree.Node
      org.moeaframework.util.tree.Constant

public class Constant
extends Node

The node for defining a constant value. The inputs and outputs to this node are shown below:

Name	Type	Description
Return Value	Number	The constant value

Constructor Summary

Constant(boolean value)
Constructs a new node for defining a constant boolean value.

Constant(Class<?> type, Object value)
Constructs a new node for defining a constant Object.

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.

Method Summary

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() Returns a string representation of the object.

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 Detail

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 Detail

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()

Description copied from class: java.lang.Object

Returns a string representation of the object. In general, the toString method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.

The toString method for class Object returns a string consisting of the name of the class of which the object is an instance, the at-sign character `@', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:

 getClass().getName() + '@' + Integer.toHexString(hashCode())
 

Overrides:

toString in class Node

Returns:

a string representation of the object.