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   this work for additional information regarding copyright ownership.
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package org.apache.poi.ss.formula.functions;

import static org.apache.poi.ss.formula.functions.AggregateFunction.subtotalInstance;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

import org.apache.poi.ss.formula.LazyRefEval;
import org.apache.poi.ss.formula.eval.ErrorEval;
import org.apache.poi.ss.formula.eval.EvaluationException;
import org.apache.poi.ss.formula.eval.OperandResolver;
import org.apache.poi.ss.formula.eval.ValueEval;

/**
 * Implementation for the Excel function SUBTOTAL

* * Syntax :
* SUBTOTAL ( functionCode, ref1, ref2 ... )
*

* * * *
Parameter descriptions
functionCode(1-11) Selects the underlying aggregate function to be used (see table below)
ref1, ref2 ...Arguments to be passed to the underlying aggregate function

* * * * * * * * * * * * * * * * * * * * * * * * * * *
Parameter descriptions
functionCodeAggregate Function
1AVERAGE
2COUNT
3COUNTA
4MAX
5MIN
6PRODUCT
7STDEV
8STDEVP
9SUM
10VAR
11VARP
101AVERAGE
102COUNT
103COUNTA
104MAX
105MIN
106PRODUCT
107STDEV
108STDEVP
109SUM
110VAR
111VARP

* * Functions 101-111 are the same as functions 1-11 but with * the option 'ignore hidden values'. */ public class Subtotal implements Function { private static Function findFunction(int functionCode) throws EvaluationException { switch (functionCode) { case 1: return subtotalInstance(AggregateFunction.AVERAGE, true); case 2: return Count.subtotalInstance(true); case 3: return Counta.subtotalInstance(true); case 4: return subtotalInstance(AggregateFunction.MAX, true); case 5: return subtotalInstance(AggregateFunction.MIN, true); case 6: return subtotalInstance(AggregateFunction.PRODUCT, true); case 7: return subtotalInstance(AggregateFunction.STDEV, true); case 8: return subtotalInstance(AggregateFunction.STDEVP, true); case 9: return subtotalInstance(AggregateFunction.SUM, true); case 10: return subtotalInstance(AggregateFunction.VAR, true); case 11: return subtotalInstance(AggregateFunction.VARP, true); case 101: return subtotalInstance(AggregateFunction.AVERAGE, false); case 102: return Count.subtotalInstance(false); case 103: return Counta.subtotalInstance(false); case 104: return subtotalInstance(AggregateFunction.MAX, false); case 105: return subtotalInstance(AggregateFunction.MIN, false); case 106: return subtotalInstance(AggregateFunction.PRODUCT, false); case 107: return subtotalInstance(AggregateFunction.STDEV, false); case 108: return subtotalInstance(AggregateFunction.STDEVP, false); case 109: return subtotalInstance(AggregateFunction.SUM, false); case 110: return subtotalInstance(AggregateFunction.VAR, false); case 111: return subtotalInstance(AggregateFunction.VARP, false); } throw EvaluationException.invalidValue(); } @Override public ValueEval evaluate(ValueEval[] args, int srcRowIndex, int srcColumnIndex) { int nInnerArgs = args.length-1; // -1: first arg is used to select from a basic aggregate function if (nInnerArgs < 1) { return ErrorEval.VALUE_INVALID; } final Function innerFunc; int functionCode; try { ValueEval ve = OperandResolver.getSingleValue(args[0], srcRowIndex, srcColumnIndex); functionCode = OperandResolver.coerceValueToInt(ve); innerFunc = findFunction(functionCode); } catch (EvaluationException e) { return e.getErrorEval(); } // ignore the first arg, this is the function-type, we check for the length above final List list = new ArrayList<>(Arrays.asList(args).subList(1, args.length)); Iterator it = list.iterator(); // See https://support.office.com/en-us/article/SUBTOTAL-function-7b027003-f060-4ade-9040-e478765b9939 // "If there are other subtotals within ref1, ref2,... (or nested subtotals), these nested subtotals are ignored to avoid double counting." // For array references it is handled in other evaluation steps, but we need to handle this here for references to subtotal-functions while(it.hasNext()) { ValueEval eval = it.next(); if(eval instanceof LazyRefEval) { LazyRefEval lazyRefEval = (LazyRefEval) eval; if(lazyRefEval.isSubTotal()) { it.remove(); } if (functionCode > 100 && lazyRefEval.isRowHidden()) { it.remove(); } } } return innerFunc.evaluate(list.toArray(new ValueEval[0]), srcRowIndex, srcColumnIndex); } }




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