org.diirt.datasource.formula

Class FormulaFunctions

java.lang.Object

org.diirt.datasource.formula.FormulaFunctions

public class FormulaFunctions
extends Object

A set of utility methods for formula functions.

Author:

carcassi

Constructor Summary

Constructors

Constructor and Description
FormulaFunctions()

Method Summary

Modifier and Type	Method and Description
static Collection<FormulaFunction>	findArgTypeMatch(List<Class<?>> argTypes, Collection<FormulaFunction> formulaFunctions) Finds the functions that match the given types as arguments.
static FormulaFunction	findFirstMatch(List<Object> arguments, Collection<FormulaFunction> formulaFunctions) Finds the first function that can accept the given values as arguments.
static String	format(String function, List<String> args) Given the function name and a string representation of the arguments, returns the properly formatted string representation of the whole expression.
static String	formatSignature(FormulaFunction function) Returns a string representation of the function that will include the function name, argument types, argument names and the result type.
static boolean	matchArgumentCount(int nArguments, FormulaFunction function) Check whether the function will accept the given number of arguments.
static boolean	matchArgumentTypes(List<Object> arguments, FormulaFunction function) Check whether the function will accept the given list of values as arguments.
static boolean	matchArgumentTypes(List<Object> arguments, FormulaFunction function, boolean allowNull) Checks whether the function will accept the given arguments.

Methods inherited from class java.lang.Object

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

Constructor Detail

FormulaFunctions

public FormulaFunctions()

Method Detail

matchArgumentTypes

public static boolean matchArgumentTypes(List<Object> arguments,
                                         FormulaFunction function)

Check whether the function will accept the given list of values as arguments.

Parameters:

arguments - the possible values

function - a function

Returns:

true if the function can accept the given arguments

matchArgumentTypes

public static boolean matchArgumentTypes(List<Object> arguments,
                                         FormulaFunction function,
                                         boolean allowNull)

Checks whether the function will accept the given arguments.

Parameters:

arguments - the arguments

function - a function

allowNull - whether the function should allow null arguments

Returns:

true if the function can accept the given arguments

matchArgumentCount

public static boolean matchArgumentCount(int nArguments,
                                         FormulaFunction function)

Check whether the function will accept the given number of arguments.

Parameters:

nArguments - the number of arguments

function - a function

Returns:

true if the function can accept the given number of arguments

findFirstMatch

public static FormulaFunction findFirstMatch(List<Object> arguments,
                                             Collection<FormulaFunction> formulaFunctions)

Finds the first function that can accept the given values as arguments.

Parameters:

arguments - the possible values

formulaFunctions - a collection of functions

Returns:

the first function that accepts the give arguments

findArgTypeMatch

public static Collection<FormulaFunction> findArgTypeMatch(List<Class<?>> argTypes,
                                                           Collection<FormulaFunction> formulaFunctions)

Finds the functions that match the given types as arguments.

Parameters:

argTypes - the possible types

formulaFunctions - a collection of functions

Returns:

the first function that accepts the give arguments

formatSignature

public static String formatSignature(FormulaFunction function)

Returns a string representation of the function that will include the function name, argument types, argument names and the result type.

Parameters:

function - a function

Returns:

string representation

format

public static String format(String function,
                            List<String> args)

Given the function name and a string representation of the arguments, returns the properly formatted string representation of the whole expression.

Parameters:

function - the function name

args - the arguments

Returns:

the expression text representation