Package org.moeaframework.util.tree

Class Lambda

java.lang.Object

org.moeaframework.util.tree.Node

org.moeaframework.util.tree.Lambda

All Implemented Interfaces:

Serializable

public class Lambda
extends Node

The node for defining an immutable, anonymous function. Unlike Define, the behavior (body) of a Lambda can not be modified. Therefore, Lambdas are useful for providing pre-defined functions built using existing Nodes.

See Also:

• Define
• Serialized Form

Constructor Summary

Constructors

Constructor	Description
Lambda(Node node)	Constructs a new node for defining an immutable, anonymous function with no arguments.
Lambda(Node node, String[] variableNames, Class<?>[] variableTypes)	Constructs a new node for defining an immutable, anonymous function with a user-defined number of arguments.
Lambda(Node node, String variableName, Class<?> variableType)	Constructs a new node for defining an immutable, anonymous function with one argument.
Lambda(Node node, String name1, Class<?> type1, String name2, Class<?> type2)	Constructs a new node for defining an immutable, anonymous function with two arguments.

Method Summary

Modifier and Type	Method	Description
Node	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.

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 Details

Lambda

public Lambda(Node node)

Constructs a new node for defining an immutable, anonymous function with no arguments.

Parameters:

node - the body of this function

Throws:

IllegalArgumentException - if node is incomplete or not strongly typed (i.e., node.isValid() returns false)

Lambda

public Lambda(Node node,
 String variableName,
 Class<?> variableType)

Constructs a new node for defining an immutable, anonymous function with one argument.

Parameters:

node - the body of this function

variableName - the name of the argument

variableType - the type of the argument

Throws:

IllegalArgumentException - if node is incomplete or not strongly typed (i.e., node.isValid() returns false)

Lambda

public Lambda(Node node,
 String name1,
 Class<?> type1,
 String name2,
 Class<?> type2)

Constructs a new node for defining an immutable, anonymous function with two arguments.

Parameters:

node - the body of this function

name1 - the name of the first argument

type1 - the type of the first argument

name2 - the name of the second argument

type2 - the type of the second argument

Throws:

IllegalArgumentException - if node is incomplete or not strongly typed (i.e., node.isValid() returns false)

Lambda

public Lambda(Node node,
 String[] variableNames,
 Class<?>[] variableTypes)

Constructs a new node for defining an immutable, anonymous function with a user-defined number of arguments.

Parameters:

node - the body of this function

variableNames - the names of the arguments to this function

variableTypes - the types of the arguments to this function

Throws:

IllegalArgumentException - if node is incomplete or not strongly typed (i.e., node.isValid() returns false)

Method Details

copyNode

public Node 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