Countifs fail to evaluate correctly #825

main/SS/Formula/Functions/Baseifs.cs

@@ -0,0 +1,174 @@
+using NPOI.SS.Formula.Eval;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace NPOI.SS.Formula.Functions
+{
+    public abstract class Baseifs : FreeRefFunction
+    {
+        public abstract bool HasInitialRange();
+
+        public interface IAggregator
+        {
+            void AddValue(ValueEval d);
+            ValueEval GetResult();
+        }
+
+        public abstract IAggregator CreateAggregator();
+
+        public ValueEval Evaluate(ValueEval[] args, OperationEvaluationContext ec)
+        {
+            bool hasInitialRange = HasInitialRange();
+            int firstCriteria = hasInitialRange ? 1 : 0;
+
+            if (args.Length < (2 + firstCriteria) || args.Length % 2 != firstCriteria)
+            {
+                return ErrorEval.VALUE_INVALID;
+            }
+
+            try
+            {
+                AreaEval sumRange = null;
+                if (hasInitialRange)
+                {
+                    sumRange = convertRangeArg(args[0]);
+                }
+
+                // collect pairs of ranges and criteria
+                AreaEval[] ae = new AreaEval[(args.Length - firstCriteria) / 2];
+                IMatchPredicate[] mp = new IMatchPredicate[ae.Length];
+                for (int i = firstCriteria, k = 0; i < (args.Length - 1); i += 2, k++)
+                {
+                    ae[k] = convertRangeArg(args[i]);
+
+                    mp[k] = Countif.CreateCriteriaPredicate(args[i + 1], ec.RowIndex, ec.ColumnIndex);                    
+                }
+
+                validateCriteriaRanges(sumRange, ae);
+                validateCriteria(mp);
+
+                return aggregateMatchingCells(CreateAggregator(), sumRange, ae, mp);
+            }
+            catch (EvaluationException e)
+            {
+                return e.GetErrorEval();
+            }
+        }
+
+        /**
+         * Verify that each <code>criteriaRanges</code> argument contains the same number of rows and columns
+         * including the <code>sumRange</code> argument if present
+         * @param sumRange if used, it must match the shape of the criteriaRanges
+         * @param criteriaRanges to check
+         * @throws EvaluationException if the ranges do not match.
+         */
+        private static void validateCriteriaRanges(AreaEval sumRange, AreaEval[] criteriaRanges)
+        {
+            int h = criteriaRanges[0].Height;
+            int w = criteriaRanges[0].Width;
+
+            if (sumRange != null
+                    && (sumRange.Height != h
+                    || sumRange.Width != w))
+            {
+                throw new EvaluationException(ErrorEval.VALUE_INVALID);
+
+            }
+
+            foreach (AreaEval r in criteriaRanges)
+            {
+                if (r.Height != h ||
+                        r.Width != w)
+                {
+                    throw new EvaluationException(ErrorEval.VALUE_INVALID);
+                }
+            }
+        }
+
+        /**
+        * Verify that each <code>criteria</code> predicate is valid, i.e. not an error
+        * @param criteria to check
+        *
+        * @throws EvaluationException if there are criteria which resulted in Errors.
+        */
+        private static void validateCriteria(IMatchPredicate[] criteria)
+        {
+            foreach (IMatchPredicate predicate in criteria)
+            {
+                // check for errors in predicate and return immediately using this error code
+                if (predicate is Countif.ErrorMatcher)
+                {
+                    throw new EvaluationException(
+                        ErrorEval.ValueOf(((NPOI.SS.Formula.Functions.Countif.ErrorMatcher)predicate).Value));
+                }
+            }
+        }
+
+
+        /**
+         * @param sumRange  the range to sum, if used (uses 1 for each match if not present)
+         * @param ranges  criteria ranges
+         * @param predicates  array of predicates, a predicate for each value in <code>ranges</code>
+         * @return the computed value
+         * @throws EvaluationException if there is an issue with eval
+         */
+        private static ValueEval aggregateMatchingCells(IAggregator aggregator, AreaEval sumRange, AreaEval[] ranges, IMatchPredicate[] predicates)
+        {
+            int height = ranges[0].Height;
+            int width = ranges[0].Width;
+
+            for (int r = 0; r < height; r++) 
+            {
+                for (int c = 0; c < width; c++) 
+                {
+                    bool matches = true;
+                    for (int i = 0; i < ranges.Length; i++) 
+                    {
+                        AreaEval aeRange = ranges[i];
+                        IMatchPredicate mp = predicates[i];
+
+                        if (mp == null || !mp.Matches(aeRange.GetRelativeValue(r, c))) 
+                        {
+                            matches = false;
+                            break;
+                        }
+                    }
+
+                    if (matches)
+                    { // aggregate only if all of the corresponding criteria specified are true for that cell.
+                        if (sumRange != null)
+                        {
+                            ValueEval value = sumRange.GetRelativeValue(r, c);
+                            if (value is ErrorEval) 
+                            {
+                                throw new EvaluationException((ErrorEval)value);
+                            }
+                            aggregator.AddValue(value);
+                        }
+                        else
+                        {
+                            aggregator.AddValue(null);
+                        }
+                    }
+                }
+            }
+
+            return aggregator.GetResult();
+        }
+
+
+        protected static AreaEval convertRangeArg(ValueEval eval)
+        {
+            if (eval is AreaEval) {
+                return (AreaEval) eval;
+            }
+            if (eval is RefEval) {
+                return ((RefEval) eval).Offset(0, 0, 0, 0);
+            }
+            throw new EvaluationException(ErrorEval.VALUE_INVALID);
+        }
+    }
+}

main/SS/Formula/Functions/Countifs.cs

@@ -29,33 +29,34 @@ namespace NPOI.SS.Formula.Functions
      * </p>
      */
 
-    public class Countifs : FreeRefFunction
+    public class Countifs : Baseifs
     {
         public static FreeRefFunction instance = new Countifs();
 
-        public ValueEval Evaluate(ValueEval[] args, OperationEvaluationContext ec)
+
+        public override bool HasInitialRange()
         {
-            Double result = double.NaN;
-            if (args.Length == 0 || args.Length % 2 > 0)
+            return false;
+        }
+
+        public class MyAggregator : IAggregator
+        {
+            double accumulator = 0.0;
+
+            public void AddValue(ValueEval d)
             {
-                return ErrorEval.VALUE_INVALID;
+                accumulator += 1.0;
             }
-            for (int i = 0; i < args.Length; )
+
+            public ValueEval GetResult()
             {
-                ValueEval firstArg = args[i];
-                ValueEval secondArg = args[i + 1];
-                i += 2;
-                NumberEval Evaluate = (NumberEval)new Countif().Evaluate(new ValueEval[] { firstArg, secondArg }, ec.RowIndex, ec.ColumnIndex);
-                if (double.IsNaN(result))
-                {
-                    result = Evaluate.NumberValue;
-                }
-                else if (Evaluate.NumberValue < result)
-                {
-                    result = Evaluate.NumberValue;
-                }
+                return new NumberEval(accumulator);
             }
-            return new NumberEval(double.IsNaN(result) ? 0 : result);
+        }
+
+        public override IAggregator CreateAggregator()
+        {
+            return new MyAggregator();
         }
     }
 

testcases/main/SS/Formula/Functions/CountifsTests.cs

@@ -51,6 +51,41 @@ public void TestCallFunction()
             Assert.AreEqual(1.0d, Evaluate.NumberValue);
         }
 
+        // issue#825
+        [Test]
+        public void TestMultiRows()
+        {
+            HSSFWorkbook workbook = new HSSFWorkbook();
+            ISheet sheet = workbook.CreateSheet("test");
+            IRow row1 = sheet.CreateRow(0);
+            IRow row2 = sheet.CreateRow(1);
+            IRow row3 = sheet.CreateRow(2);
+
+            ICell cellA1 = row1.CreateCell(0, CellType.Formula);
+
+            ICell cellB1 = row2.CreateCell(1, CellType.Numeric);
+            ICell cellC1 = row1.CreateCell(2, CellType.Numeric);
+            ICell cellB2 = row2.CreateCell(1, CellType.Numeric);
+            ICell cellC2 = row2.CreateCell(2, CellType.Numeric);
+            ICell cellB3 = row3.CreateCell(1, CellType.Numeric);
+            ICell cellC3 = row3.CreateCell(2, CellType.Numeric);
+
+
+            cellB1.SetCellValue(1);
+            cellB2.SetCellValue(2);
+            cellB3.SetCellValue(2);
+
+            cellC1.SetCellValue(2);
+            cellC2.SetCellValue(2);
+            cellC3.SetCellValue(3);
+
+            // Only Row2 satisfy both conditions, so result should be 1
+            cellA1.SetCellFormula("COUNTIFS(B1:B3,2, C1:C3,2)");
+            IFormulaEvaluator Evaluator = workbook.GetCreationHelper().CreateFormulaEvaluator();
+            CellValue Evaluate = Evaluator.Evaluate(cellA1);
+            Assert.AreEqual(1.0d, Evaluate.NumberValue);
+        }
+
         [Test]
         public void TestCallFunction_invalidArgs()
         {