org.lsmp.djep.groupJep
Class GroupJep

java.lang.Object
  org.nfunk.jep.JEP
      org.lsmp.djep.groupJep.GroupJep

public class GroupJep

extends JEP

An extension of JEP which allows calculations over arbitary groups, such as the integers(exact answers) and rationals.

Author:

Rich Morris Created on 19-Dec-2003

Field Summary

protected GroupI

group

Fields inherited from class org.nfunk.jep.JEP

allowAssignment, allowUndeclared, errorList, ev, funTab, implicitMul, numberFactory, opSet, parser, symTab

Constructor Summary

GroupJep(GroupI group)
Create a new GroupJep instance with calculations over the given group.

GroupJep(JEP j)

Method Summary

void	addStandardConstants() Adds the constants pi and e to the parser.
void	addStandardFunctions() Adds the standard functions to the parser.
Complex	getComplexValue() Calcuates the value of the expression and returns the result as a complex number.
static Complex	getComplexValue(java.lang.Object num) A utility function which returns the complex aproximation of a number.
GroupI	getGroup()

Methods inherited from class org.nfunk.jep.JEP

addComplex, addConstant, addFunction, addVariable, addVariable, addVariable, evaluate, getAllowAssignment, getAllowUndeclared, getErrorInfo, getFunctionTable, getImplicitMul, getNumberFactory, getOperatorSet, getParser, getSymbolTable, getTopNode, getTraverse, getValue, getValueAsObject, getVar, getVarValue, hasError, initFunTab, initSymTab, parse, parseExpression, removeFunction, removeVariable, setAllowAssignment, setAllowUndeclared, setImplicitMul, setTraverse, setVarValue

Methods inherited from class java.lang.Object

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

Field Detail

group

protected GroupI group

Constructor Detail

GroupJep

public GroupJep(GroupI group)

Create a new GroupJep instance with calculations over the given group.

Parameters:

group - The group to calculate over.

GroupJep

public GroupJep(JEP j)

Method Detail

addStandardFunctions

public void addStandardFunctions()

Description copied from class: JEP

Adds the standard functions to the parser. If this function is not called before parsing an expression, functions such as sin() or cos() would produce an "Unrecognized function..." error. In most cases, this method should be called immediately after the JEP object is created.

Overrides:

addStandardFunctions in class JEP

addStandardConstants

public void addStandardConstants()

Description copied from class: JEP

Adds the constants pi and e to the parser. As addStandardFunctions(), this method should be called immediatly after the JEP object is created.

Overrides:

addStandardConstants in class JEP

getGroup

public GroupI getGroup()

getComplexValue

public Complex getComplexValue()

Calcuates the value of the expression and returns the result as a complex number.

Overrides:

getComplexValue in class JEP

Returns:

The calculated value of the expression as a complex number if no errors occur. Returns null otherwise.

getComplexValue

public static Complex getComplexValue(java.lang.Object num)

A utility function which returns the complex aproximation of a number.

Parameters:

num - the object to be converted

Returns:

the complex aproximation or null if conversion to complex is not posible.

See Also:

HasComplexValueI