org.zkoss.poi.ss.formula.functions

Class BooleanFunction

java.lang.Object

org.zkoss.poi.ss.formula.functions.BooleanFunction

All Implemented Interfaces:

Function

public abstract class BooleanFunction
extends java.lang.Object
implements Function

Here are the general rules concerning Boolean functions:

1. Blanks are ignored (not either true or false)
2. Strings are ignored if part of an area ref or cell ref, otherwise they must be 'true' or 'false'
3. Numbers: 0 is false. Any other number is TRUE
4. Areas: *all* cells in area are evaluated according to the above rules

Author:

Amol S. Deshmukh < amolweb at ya hoo dot com >

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	BooleanFunction.OneArg

Field Summary

Fields

Modifier and Type	Field and Description
static Function	AND
static Function	FALSE
static Function	NOT
static Function	OR
static Function	TRUE

Constructor Summary

Constructors

Constructor and Description
BooleanFunction()

Method Summary

Modifier and Type	Method and Description
ValueEval	evaluate(ValueEval[] args, int srcRow, int srcCol)
protected abstract boolean	getInitialResultValue()
protected abstract boolean	partialEvaluate(boolean cumulativeResult, boolean currentValue)

Methods inherited from class java.lang.Object

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

Field Detail

AND

public static final Function AND

OR

public static final Function OR

FALSE

public static final Function FALSE

TRUE

public static final Function TRUE

NOT

public static final Function NOT

Constructor Detail

BooleanFunction

public BooleanFunction()

Method Detail

evaluate

public final ValueEval evaluate(ValueEval[] args,
                                int srcRow,
                                int srcCol)

Specified by:

evaluate in interface Function

Parameters:

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

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

srcCol - 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.

getInitialResultValue

protected abstract boolean getInitialResultValue()

partialEvaluate

protected abstract boolean partialEvaluate(boolean cumulativeResult,
                                           boolean currentValue)