com.singularsys.jep.functions
Class NaryBinaryFunction

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

All Implemented Interfaces:

PostfixMathCommandI, java.io.Serializable

Direct Known Subclasses:

Add, BigDecAdd, BigDecMul, Concat, Multiply

public abstract class NaryBinaryFunction
extends PostfixMathCommand

Convenient base class for n-ary functions backed by a binary operation. Defines an Object eval(Object l,Object r) method for calculating the result. The operation must be associative.

Author:

Richard Morris

See Also:

Serialized Form

Field Summary

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

curNumberOfParameters, name, NaN, numberOfParameters

Constructor Summary

NaryBinaryFunction()

Method Summary

boolean	checkNumberOfParameters(int n) Checks the number of parameters of the function.
java.lang.Object	eval(java.lang.Object[] args)
abstract java.lang.Object	eval(java.lang.Object l, java.lang.Object r)
void	run(java.util.Stack<java.lang.Object> stack) Calls eval(Object, Object)

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

asArray, asBool, asDouble, asInt, asLong, asStrictInt, asString, checkStack, getName, getNumberOfParameters, setCurNumberOfParameters, setName, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

NaryBinaryFunction

public NaryBinaryFunction()

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.

run

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

Calls eval(Object, Object)

Throws:

EvaluationException

eval

public final java.lang.Object eval(java.lang.Object[] args)
                            throws EvaluationException

Throws:

EvaluationException

eval

public abstract java.lang.Object eval(java.lang.Object l,
                                      java.lang.Object r)
                               throws EvaluationException

Throws:

EvaluationException