uk.co.cogitolearning.cogpar

Class AdditionExpressionNode

java.lang.Object

uk.co.cogitolearning.cogpar.SequenceExpressionNode

uk.co.cogitolearning.cogpar.AdditionExpressionNode

All Implemented Interfaces:

ExpressionNode

public class AdditionExpressionNode
extends SequenceExpressionNode

An ExpressionNode that handles additions and subtractions. The node can hold an arbitrary number of terms that are either added or subtraced from the sum.

Nested Class Summary

Nested classes/interfaces inherited from class uk.co.cogitolearning.cogpar.SequenceExpressionNode

SequenceExpressionNode.Term

Field Summary

Fields inherited from class uk.co.cogitolearning.cogpar.SequenceExpressionNode

terms

Fields inherited from interface uk.co.cogitolearning.cogpar.ExpressionNode

ADDITION_NODE, CONSTANT_NODE, EXPONENTIATION_NODE, FUNCTION_NODE, MULTIPLICATION_NODE, VARIABLE_NODE

Constructor Summary

Constructors

Constructor and Description
AdditionExpressionNode(ExpressionNode node, boolean positive) Constructor to create an addition with the first term already added.

Method Summary

Modifier and Type	Method and Description
void	accept(ExpressionNodeVisitor visitor) Implementation of the visitor design pattern.
int	getType() Returns the type of the node, in this case ExpressionNode.ADDITION_NODE
double	getValue() Returns the value of the sub-expression that is rooted at this node.

Methods inherited from class uk.co.cogitolearning.cogpar.SequenceExpressionNode

add

Methods inherited from class java.lang.Object

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

Constructor Detail

AdditionExpressionNode

public AdditionExpressionNode(ExpressionNode node,
                              boolean positive)

Constructor to create an addition with the first term already added.

Parameters:

node - the term to be added

positive - a flag indicating whether the term is added or subtracted

Method Detail

getType

public int getType()

Returns the type of the node, in this case ExpressionNode.ADDITION_NODE

Returns:

type of the node

getValue

public double getValue()

Returns the value of the sub-expression that is rooted at this node. All the terms are evaluated and added or subtracted from the total sum.

Returns:

value of expression

accept

public void accept(ExpressionNodeVisitor visitor)

Implementation of the visitor design pattern. Calls visit on the visitor and then passes the visitor on to the accept method of all the terms in the sum.

Parameters:

visitor - the visitor