org.nfunk.jep.function
Class Assign

java.lang.Object
  org.nfunk.jep.function.PostfixMathCommand
      org.nfunk.jep.function.Assign

All Implemented Interfaces:

CallbackEvaluationI, PostfixMathCommandI

Direct Known Subclasses:

MAssign, XAssign

public class Assign
extends PostfixMathCommand
implements CallbackEvaluationI

An assignment operator so we can do x=3+4. This function implements the CallbackEvaluationI interface so that it handles setting the value of a variable. Any Variable or function which implements the LValueI can appear on the left hand side of the equation.

Author:

Rich Morris Created on 18-Nov-2003

Field Summary

Fields inherited from class org.nfunk.jep.function.PostfixMathCommand

curNumberOfParameters, numberOfParameters

Constructor Summary

Assign()

Method Summary

java.lang.Object

evaluate(Node node, EvaluatorI pv) For assignment set the value of the variable on the lhs to value returned by evaluating the righthand side.

Methods inherited from class org.nfunk.jep.function.PostfixMathCommand

checkNumberOfParameters, checkStack, getNumberOfParameters, run, setCurNumberOfParameters

Methods inherited from class java.lang.Object

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

Constructor Detail

Assign

public Assign()

Method Detail

evaluate

public java.lang.Object evaluate(Node node,
                                 EvaluatorI pv)
                          throws ParseException

For assignment set the value of the variable on the lhs to value returned by evaluating the righthand side.

Specified by:

evaluate in interface CallbackEvaluationI

Parameters:

node - The current node

pv - The visitor, can be used evaluate the children

Returns:

the value after evaluation

Throws:

ParseException