org.apache.poi.ss.formula.functions

Class DStarRunner

java.lang.Object

org.apache.poi.ss.formula.functions.DStarRunner

All Implemented Interfaces:

Function, Function3Arg

public final class DStarRunner
extends java.lang.Object
implements Function3Arg

This class performs a D* calculation. It takes an IDStarAlgorithm object and uses it for calculating the result value. Iterating a database and checking the entries against the set of conditions is done here. TODO: - wildcards ? and * in string conditions - functions as conditions

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DStarRunner.DStarAlgorithmEnum Enum for convenience to identify and source implementations of the D* functions

Constructor Summary

Constructors

Constructor and Description
DStarRunner(DStarRunner.DStarAlgorithmEnum algorithm)

Method Summary

Modifier and Type	Method and Description
ValueEval	evaluate(int srcRowIndex, int srcColumnIndex, ValueEval database, ValueEval filterColumn, ValueEval conditionDatabase) see Function.evaluate(ValueEval[], int, int)
ValueEval	evaluate(ValueEval[] args, int srcRowIndex, int srcColumnIndex)

Methods inherited from class java.lang.Object

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

Constructor Detail

DStarRunner

public DStarRunner(DStarRunner.DStarAlgorithmEnum algorithm)

Parameters:

algorithm - to implement

Method Detail

evaluate

public final ValueEval evaluate(ValueEval[] args,
                                int srcRowIndex,
                                int srcColumnIndex)

Specified by:

evaluate in interface Function

Parameters:

args - the evaluated function arguments. Empty values are represented with BlankEval or MissingArgEval, never null.

srcRowIndex - row index of the cell containing the formula under evaluation

srcColumnIndex - column index of the cell containing the formula under evaluation

Returns:

The evaluated result, possibly an ErrorEval, never null. Note - Excel uses the error code #NUM! instead of IEEE NaN, so when numeric functions evaluate to Double.NaN be sure to translate the result to ErrorEval.NUM_ERROR.

evaluate

public ValueEval evaluate(int srcRowIndex,
                          int srcColumnIndex,
                          ValueEval database,
                          ValueEval filterColumn,
                          ValueEval conditionDatabase)

Description copied from interface: Function3Arg

see Function.evaluate(ValueEval[], int, int)

Specified by:

evaluate in interface Function3Arg