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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
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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.NotImplementedFunctionException;
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 descriptionsfunctionCode (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 descriptionsfunctionCode Aggregate Function
1 AVERAGE
2 COUNT
3 COUNTA
4 MAX
5 MIN
6 PRODUCT
7 STDEV
8 STDEVP *
9 SUM
10 VAR *
11 VARP *
101 AVERAGE
102 COUNT
103 COUNTA
104 MAX
105 MIN
106 PRODUCT
107 STDEV
108 STDEVP *
109 SUM
110 VAR *
111 VARP *


 * * Not implemented in POI yet. 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: throw new NotImplementedFunctionException("STDEVP");
            case 9: return subtotalInstance(AggregateFunction.SUM, true);
            case 10: throw new NotImplementedFunctionException("VAR");
            case 11: throw new NotImplementedFunctionException("VARP");
            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: throw new NotImplementedFunctionException("STDEVP SUBTOTAL with 'exclude hidden values' option");
            case 109: return subtotalInstance(AggregateFunction.SUM, false);
            case 110: throw new NotImplementedFunctionException("VAR SUBTOTAL with 'exclude hidden values' option");
            case 111: throw new NotImplementedFunctionException("VARP SUBTOTAL with 'exclude hidden values' option");
        }
        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);
    }
}

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

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