Package uk.co.cogitolearning.cogpar

Class FunctionExpressionNode

java.lang.Object

uk.co.cogitolearning.cogpar.FunctionExpressionNode

All Implemented Interfaces:

ExpressionNode

public class FunctionExpressionNode
extends Object
implements ExpressionNode

An ExpressionNode that handles mathematical functions. Some pre-defined functions are handled, others can easily be added.

Field Summary

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

ADDITION_NODE, CONSTANT_NODE, EXPONENTIATION_NODE, FUNCTION_NODE, MULTIPLICATION_NODE, VARIABLE_NODE

Method Summary

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

Methods inherited from class java.lang.Object

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

Method Detail

getType

public int getType()

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

Specified by:

getType in interface ExpressionNode

Returns:

type of the node

getValue

public double getValue()

Returns the value of the sub-expression that is rooted at this node. The argument is evaluated and then the function is applied to the resulting value.

Specified by:

getValue in interface ExpressionNode

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 the argument.

Specified by:

accept in interface ExpressionNode

Parameters:

visitor - the visitor