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package org.apache.poi.ss.formula.functions;
import java.util.Calendar;
import org.apache.poi.ss.formula.OperationEvaluationContext;
import org.apache.poi.ss.formula.eval.ErrorEval;
import org.apache.poi.ss.formula.eval.EvaluationException;
import org.apache.poi.ss.formula.eval.NumberEval;
import org.apache.poi.ss.formula.eval.OperandResolver;
import org.apache.poi.ss.formula.eval.ValueEval;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.util.LocaleUtil;
/**
* Implementation for Excel WeekNum() function.
*
* Syntax:
WeekNum (Serial_num,Return_type)
*
* Returns a number that indicates where the week falls numerically within a year.
*
*
* Serial_num is a date within the week. Dates should be entered by using the DATE function,
* or as results of other formulas or functions. For example, use DATE(2008,5,23)
* for the 23rd day of May, 2008. Problems can occur if dates are entered as text.
* Return_type is a number that determines on which day the week begins. The default is 1.
* 1 Week begins on Sunday. Weekdays are numbered 1 through 7.
* 2 Week begins on Monday. Weekdays are numbered 1 through 7.
*/
public class WeekNum extends Fixed2ArgFunction implements FreeRefFunction {
public static final FreeRefFunction instance = new WeekNum();
public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval serialNumVE, ValueEval returnTypeVE) {
double serialNum;
try {
serialNum = NumericFunction.singleOperandEvaluate(serialNumVE, srcRowIndex, srcColumnIndex);
} catch (EvaluationException e) {
return ErrorEval.VALUE_INVALID;
}
Calendar serialNumCalendar = LocaleUtil.getLocaleCalendar();
serialNumCalendar.setTime(DateUtil.getJavaDate(serialNum, false));
int returnType;
try {
ValueEval ve = OperandResolver.getSingleValue(returnTypeVE, srcRowIndex, srcColumnIndex);
returnType = OperandResolver.coerceValueToInt(ve);
} catch (EvaluationException e) {
return ErrorEval.NUM_ERROR;
}
if (returnType != 1 && returnType != 2) {
return ErrorEval.NUM_ERROR;
}
return new NumberEval(this.getWeekNo(serialNumCalendar, returnType));
}
public int getWeekNo(Calendar cal, int weekStartOn) {
if (weekStartOn == 1) {
cal.setFirstDayOfWeek(Calendar.SUNDAY);
} else {
cal.setFirstDayOfWeek(Calendar.MONDAY);
}
return cal.get(Calendar.WEEK_OF_YEAR);
}
public ValueEval evaluate(ValueEval[] args, OperationEvaluationContext ec) {
if (args.length == 2) {
return evaluate(ec.getRowIndex(), ec.getColumnIndex(), args[0], args[1]);
}
return ErrorEval.VALUE_INVALID;
}
}