com.singularsys.jep.functions
Class Ele

java.lang.Object
  com.singularsys.jep.functions.PostfixMathCommand
      com.singularsys.jep.functions.Ele

All Implemented Interfaces:

LValueI, PostfixMathCommandI, java.io.Serializable

public class Ele
extends PostfixMathCommand
implements LValueI

Function which allows array access using the a[3] notation on left and right hand side. The first element is indexed with 1. a=[4,3,2,1]; a[2]; // Returns 2 a[2]=5; // Sets the 2nd element of a to 5. So a is now [4,5,2,1] b=[[1,2,3],[4,5,6]]; b[2][3]; // returns 6 b[2][3]=7; // sets 3rd element of 2nd row to 7 (only works with the configurable parser)

Author:

Richard Morris

See Also:

Serialized Form

Field Summary

Fields inherited from class com.singularsys.jep.functions.PostfixMathCommand

curNumberOfParameters, numberOfParameters

Constructor Summary

Ele()
Element access with mathematical convention, first element has index 1

Ele(boolean javaIndex)
Element access with mathematical convention, first element has index 1

Method Summary

boolean	checkNumberOfParameters(int n) Checks the number of parameters of the function.
void	run(java.util.Stack<java.lang.Object> s) Run the function on the stack.
void	set(Evaluator pv, Node node, java.lang.Object value) Performs appropriate action to set an LValue.

Methods inherited from class com.singularsys.jep.functions.PostfixMathCommand

checkStack, getNumberOfParameters, setCurNumberOfParameters

Methods inherited from class java.lang.Object

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

Constructor Detail

Ele

public Ele()

Element access with mathematical convention, first element has index 1

Ele

public Ele(boolean javaIndex)

Element access with mathematical convention, first element has index 1

Parameters:

javaIndex -

Method Detail

checkNumberOfParameters

public boolean checkNumberOfParameters(int n)

Description copied from class: PostfixMathCommand

Checks the number of parameters of the function. Functions which set numberOfParameter=-1 should overload this method

Specified by:

checkNumberOfParameters in interface PostfixMathCommandI

Overrides:

checkNumberOfParameters in class PostfixMathCommand

Parameters:

n - number of parameters function will be called with.

Returns:

false if an illegal number of parameters is supplied, true otherwise.

set

public void set(Evaluator pv,
                Node node,
                java.lang.Object value)
         throws EvaluationException

Description copied from interface: LValueI

Performs appropriate action to set an LValue.

Specified by:

set in interface LValueI

Parameters:

pv - a pointer to the evaluator. The pv.eval() method can be used to evaluate the children of the node.

node - The top node for the LValue

value - the value obtained by evaluating the right hand side.

Throws:

EvaluationException

run

public void run(java.util.Stack<java.lang.Object> s)
         throws EvaluationException

Description copied from interface: PostfixMathCommandI

Run the function on the stack. Pops the arguments from the stack, and pushes the result on the top of the stack.

Specified by:

run in interface PostfixMathCommandI

Throws:

EvaluationException