mondrian.olap

Interface FunDef

All Known Implementing Classes:

AbstractAggregateFunDef, AggregateFunDef, CacheFunDef, CalculatedChildFunDef, CastFunDef, CoalesceEmptyFunDef, CrossJoinFunDef, ExistingFunDef, FunDefBase, HierarchyCurrentMemberFunDef, HierarchyDimensionFunDef, IifFunDef, JavaFunDef, LevelHierarchyFunDef, LevelMembersFunDef, LinReg, LinReg.InterceptFunDef, LinReg.PointFunDef, LinReg.R2FunDef, LinReg.SlopeFunDef, LinReg.VarianceFunDef, MemberHierarchyFunDef, MemberLevelFunDef, MemberOrderKeyFunDef, NamedSetCurrentFunDef, NamedSetCurrentOrdinalFunDef, NativizeSetFunDef, NonEmptyCrossJoinFunDef, NthQuartileFunDef, ParameterFunDef, ParenthesesFunDef, RankFunDef, SetFunDef, TupleFunDef, ValidMeasureFunDef, VisualTotalsFunDef

public interface FunDef

Definition of an MDX function. See also FunTable.

Author:

jhyde, 21 April, 1999

Method Summary

Modifier and Type	Method and Description
Calc	compileCall(ResolvedFunCall call, ExpCompiler compiler) Converts a call to this function into executable objects.
Exp	createCall(Validator validator, Exp[] args) Creates an expression which represents a call to this function with a given set of arguments.
String	getDescription() Returns the description of this function.
String	getName() Returns the name of this function.
int[]	getParameterCategories() Returns the types of the arguments of this function.
int	getReturnCategory() Returns the Category code of the value returned by this function.
String	getSignature() Returns an English description of the signature of the function, for example "<Numeric Expression> / <Numeric Expression>".
Syntax	getSyntax() Returns the syntactic type of the function.
void	unparse(Exp[] args, PrintWriter pw) Converts a function call into MDX source code.

Method Detail

getSyntax

Syntax getSyntax()

Returns the syntactic type of the function.

getName

String getName()

Returns the name of this function.

getDescription

String getDescription()

Returns the description of this function.

getReturnCategory

int getReturnCategory()

Returns the Category code of the value returned by this function.

getParameterCategories

int[] getParameterCategories()

Returns the types of the arguments of this function. Values are the same as those returned by Exp.getCategory(). The 0^th argument of methods and properties are the object they are applied to. Infix operators have two arguments, and prefix operators have one argument.

createCall

Exp createCall(Validator validator,
               Exp[] args)

Creates an expression which represents a call to this function with a given set of arguments. The result is usually a ResolvedFunCall but not always.

getSignature

String getSignature()

Returns an English description of the signature of the function, for example "<Numeric Expression> / <Numeric Expression>".

unparse

void unparse(Exp[] args,
             PrintWriter pw)

Converts a function call into MDX source code.

compileCall

Calc compileCall(ResolvedFunCall call,
                 ExpCompiler compiler)

Converts a call to this function into executable objects.

The result must implement the appropriate interface for the result type. For example, a function which returns an integer must return an object which implements IntegerCalc.