Package net.sf.basedb.util.jep

Class FunctionSafeJep

java.lang.Object

org.nfunk.jep.JEP

net.sf.basedb.util.jep.FunctionSafeJep

public class FunctionSafeJep
extends JEP

Extension to the JEP parser that provides better error handling for unknown functions. The normal error message when JEP encounters an unknown function is: Syntax Error (implicit multiplication not enabled). This is not very informative so this class improves the error handling by giving a message: Unknown function foo() instead.

Since:

2.15

Author:

Nicklas

Last modified

$Date $

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
(package private) static class	FunctionSafeJep.SafeFunctionTable	Function table implementation that pretends that all possible functions exists, but sends an error message if someone tries to use a function that doesn't really exists.
(package private) static class	FunctionSafeJep.UnknownFunction	Represents an unknown function that appears in an expression.

Field Summary

Fields inherited from class org.nfunk.jep.JEP

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

Constructor Summary

Constructors

Constructor	Description
FunctionSafeJep()	Create a new function-safe JEP parser.

Method Summary

Modifier and Type	Method	Description
(package private) void	addError(String error)	Adds an error message to the "real" JEP parser.
Object	getValueAsObject()	Override the superclass method so that exceptions are passed on instead of swallowed.
void	initFunTab()	Overrides the regular function lookup table by replacing it with a function table that pretends that all functions has been registered, but then generates an error message if it doesn't exists.

Methods inherited from class org.nfunk.jep.JEP

addComplex, addConstant, addFunction, addStandardConstants, addStandardFunctions, addVariable, addVariable, addVariable, evaluate, getAllowAssignment, getAllowUndeclared, getComplexValue, getErrorInfo, getEvaluatorVisitor, getFunctionTable, getImplicitMul, getNumberFactory, getOperatorSet, getParser, getSymbolTable, getTopNode, getTraverse, getValue, getVar, getVarValue, hasError, 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

Constructor Details

FunctionSafeJep

public FunctionSafeJep()

Create a new function-safe JEP parser.

Method Details

initFunTab

public void initFunTab()

Overrides the regular function lookup table by replacing it with a function table that pretends that all functions has been registered, but then generates an error message if it doesn't exists.

Overrides:

initFunTab in class JEP

addError

void addError(String error)

Adds an error message to the "real" JEP parser.

getValueAsObject

public Object getValueAsObject()

Override the superclass method so that exceptions are passed on instead of swallowed.

Overrides:

getValueAsObject in class JEP

Since:

3.0