org.nfunk.jep.function

Class PostfixMathCommand

java.lang.Object

org.nfunk.jep.function.PostfixMathCommand

All Implemented Interfaces:

Serializable, PostfixMathCommandI

Direct Known Subclasses:

Abs, Add, ArcCosine, ArcCosineH, ArcSine, ArcSineH, ArcTangent, ArcTangent2, ArcTanH, Arg, Assign, Binomial, Ceil, Comparative, ComplexPFMC, Conjugate, Cosine, CosineH, Cross, Define, Determinant, Diagonal, Diff, Divide, Dot, Ele, Ele, Eval, Exp, ExteriorProduct, Floor, FromBase, GAdd, GComparative, GDivide, GenMat, GetDiagonal, GList, GLogical, GMod, GMultiply, GNot, GPower, GSubtract, GUMinus, Id, If, Imaginary, Inverse, Length, List, Logarithm, Logical, MacroFunction, MDiff, MIf, Modulus, Multiply, NaturalLogarithm, Not, Polar, Power, Random, Range, Rank, Real, Round, Sine, SineH, Size, Solve, SquareRoot, Str, Subtract, Sum, SumType, Tangent, TanH, ToBase, Trace, Transpose, UMinus, VEle, VMap, VPower, VSum

public class PostfixMathCommand
extends Object
implements PostfixMathCommandI, Serializable

Function classes extend this class. It is an implementation of the PostfixMathCommandI interface.

It includes a numberOfParameters member, that is checked when parsing the expression. This member should be initialized to an appropriate value for all classes extending this class. If an arbitrary number of parameters should be allowed, initialize this member to -1.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
PostfixMathCommand() Creates a new PostfixMathCommand class.

Method Summary

Modifier and Type	Method and Description
boolean	checkNumberOfParameters(int n) Checks the number of parameters of the function.
int	getNumberOfParameters() Return the required number of parameters.
void	run(Stack s) Throws an exception because this method should never be called under normal circumstances.
void	setCurNumberOfParameters(int n) Sets the number of current number of parameters used in the next call of run().

Methods inherited from class java.lang.Object

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

Constructor Detail

PostfixMathCommand

public PostfixMathCommand()

Creates a new PostfixMathCommand class.

Method Detail

getNumberOfParameters

public int getNumberOfParameters()

Return the required number of parameters.

Specified by:

getNumberOfParameters in interface PostfixMathCommandI

setCurNumberOfParameters

public void setCurNumberOfParameters(int n)

Sets the number of current number of parameters used in the next call of run(). This method is only called when the reqNumberOfParameters is -1.

Specified by:

setCurNumberOfParameters in interface PostfixMathCommandI

checkNumberOfParameters

public boolean checkNumberOfParameters(int n)

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

Specified by:

checkNumberOfParameters in interface PostfixMathCommandI

Parameters:

n - number of parameters function will be called with.

Returns:

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

run

public void run(Stack s)
         throws ParseException

Throws an exception because this method should never be called under normal circumstances. Each function should use it's own run() method for evaluating the function. This includes popping off the parameters from the stack, and pushing the result back on the stack.

Specified by:

run in interface PostfixMathCommandI

Throws:

ParseException