From: PJ Fanning Date: Tue, 18 Dec 2018 21:16:25 +0000 (+0000) Subject: [github-137] solves/unifies blank/missing value colection for PRODUCT/MDETERM/GEOMEAN... X-Git-Url: https://source.dussan.org/?a=commitdiff_plain;h=fa0066da4e8bcedcccb8b45248fb75b57f42a6dd;p=poi.git [github-137] solves/unifies blank/missing value colection for PRODUCT/MDETERM/GEOMEAN. Thanks to gallonfizik. This closes #137 git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1849237 13f79535-47bb-0310-9956-ffa450edef68 --- diff --git a/src/java/org/apache/poi/ss/formula/functions/AggregateFunction.java b/src/java/org/apache/poi/ss/formula/functions/AggregateFunction.java index 9011de1469..3d8eb4f83d 100644 --- a/src/java/org/apache/poi/ss/formula/functions/AggregateFunction.java +++ b/src/java/org/apache/poi/ss/formula/functions/AggregateFunction.java @@ -218,11 +218,7 @@ public abstract class AggregateFunction extends MultiOperandNumericFunction { public static final Function PERCENTILE = new Percentile(); - public static final Function PRODUCT = new AggregateFunction() { - protected double evaluate(double[] values) { - return MathX.product(values); - } - }; + public static final Function PRODUCT = new Product(); public static final Function SMALL = new LargeSmall(false); public static final Function STDEV = new AggregateFunction() { protected double evaluate(double[] values) throws EvaluationException { @@ -258,7 +254,24 @@ public abstract class AggregateFunction extends MultiOperandNumericFunction { return StatsLib.varp(values); } }; - public static final Function GEOMEAN = new AggregateFunction() { + public static final Function GEOMEAN = new Geomean(); + + private static class Product extends AggregateFunction { + Product() { + setMissingArgPolicy(Policy.SKIP); + } + + @Override + protected double evaluate(double[] values) throws EvaluationException { + return MathX.product(values); + } + } + + private static class Geomean extends AggregateFunction { + Geomean() { + setMissingArgPolicy(Policy.COERCE); + } + @Override protected double evaluate(double[] values) throws EvaluationException { // The library implementation returns 0 for an input sequence like [1, 0]. So this check is necessary. @@ -269,5 +282,5 @@ public abstract class AggregateFunction extends MultiOperandNumericFunction { } return new GeometricMean().evaluate(values, 0, values.length); } - }; + } } diff --git a/src/java/org/apache/poi/ss/formula/functions/MatrixFunction.java b/src/java/org/apache/poi/ss/formula/functions/MatrixFunction.java index 04e7f4cd77..b6c8aba976 100644 --- a/src/java/org/apache/poi/ss/formula/functions/MatrixFunction.java +++ b/src/java/org/apache/poi/ss/formula/functions/MatrixFunction.java @@ -284,16 +284,23 @@ public abstract class MatrixFunction implements Function{ } }; - public static final Function MDETERM = new OneArrayArg() { - private final MutableValueCollector instance = new MutableValueCollector(false, false); - + public static final Function MDETERM = new Mdeterm(); + + private static class Mdeterm extends OneArrayArg { + private final MutableValueCollector instance; + + public Mdeterm() { + instance = new MutableValueCollector(false, false); + instance.setBlankEvalPolicy(MultiOperandNumericFunction.Policy.ERROR); + } + protected double[] collectValues(ValueEval arg) throws EvaluationException { double[] values = instance.collectValues(arg); /* handle case where MDETERM is operating on an array that that is not completely filled*/ if (arg instanceof AreaEval && values.length == 1) throw new EvaluationException(ErrorEval.VALUE_INVALID); - + return instance.collectValues(arg); } @@ -307,7 +314,7 @@ public abstract class MatrixFunction implements Function{ result[0][0] = (new LUDecomposition(temp)).getDeterminant(); return result; } - }; + } public static final Function MMULT = new TwoArrayArg() { private final MutableValueCollector instance = new MutableValueCollector(false, false); diff --git a/src/java/org/apache/poi/ss/formula/functions/MultiOperandNumericFunction.java b/src/java/org/apache/poi/ss/formula/functions/MultiOperandNumericFunction.java index 8e4ec2c729..7ec5a5fcf0 100644 --- a/src/java/org/apache/poi/ss/formula/functions/MultiOperandNumericFunction.java +++ b/src/java/org/apache/poi/ss/formula/functions/MultiOperandNumericFunction.java @@ -38,13 +38,21 @@ import org.apache.poi.ss.formula.eval.ValueEval; * where the order of operands does not matter */ public abstract class MultiOperandNumericFunction implements Function { + public enum Policy {COERCE, SKIP, ERROR} - private final boolean _isReferenceBoolCounted; - private final boolean _isBlankCounted; + private interface EvalConsumer { + void accept(T value, R receiver) throws EvaluationException; + } + + private EvalConsumer boolByRefConsumer; + private EvalConsumer boolByValueConsumer; + private EvalConsumer blankConsumer; + private EvalConsumer missingArgConsumer = ConsumerFactory.createForMissingArg(Policy.SKIP); protected MultiOperandNumericFunction(boolean isReferenceBoolCounted, boolean isBlankCounted) { - _isReferenceBoolCounted = isReferenceBoolCounted; - _isBlankCounted = isBlankCounted; + boolByRefConsumer = ConsumerFactory.createForBoolEval(isReferenceBoolCounted ? Policy.COERCE : Policy.SKIP); + boolByValueConsumer = ConsumerFactory.createForBoolEval(Policy.COERCE); + blankConsumer = ConsumerFactory.createForBlank(isBlankCounted ? Policy.COERCE : Policy.SKIP); } static final double[] EMPTY_DOUBLE_ARRAY = {}; @@ -85,6 +93,14 @@ public abstract class MultiOperandNumericFunction implements Function { private static final int DEFAULT_MAX_NUM_OPERANDS = SpreadsheetVersion.EXCEL2007.getMaxFunctionArgs(); + public void setMissingArgPolicy(Policy policy) { + missingArgConsumer = ConsumerFactory.createForMissingArg(policy); + } + + public void setBlankEvalPolicy(Policy policy) { + blankConsumer = ConsumerFactory.createForBlank(policy); + } + public final ValueEval evaluate(ValueEval[] args, int srcCellRow, int srcCellCol) { try { double[] values = getNumberArray(args); @@ -183,9 +199,11 @@ public abstract class MultiOperandNumericFunction implements Function { throw new IllegalArgumentException("ve must not be null"); } if (ve instanceof BoolEval) { - if (!isViaReference || _isReferenceBoolCounted) { - BoolEval boolEval = (BoolEval) ve; - temp.add(boolEval.getNumberValue()); + BoolEval boolEval = (BoolEval) ve; + if (isViaReference) { + boolByRefConsumer.accept(boolEval, temp); + } else { + boolByValueConsumer.accept(boolEval, temp); } return; } @@ -211,16 +229,58 @@ public abstract class MultiOperandNumericFunction implements Function { throw new EvaluationException((ErrorEval) ve); } if (ve == BlankEval.instance) { - if (_isBlankCounted) { - temp.add(0.0); - } + blankConsumer.accept((BlankEval) ve, temp); return; } if (ve == MissingArgEval.instance) { - temp.add(0.0); + missingArgConsumer.accept((MissingArgEval) ve, temp); return; } throw new RuntimeException("Invalid ValueEval type passed for conversion: (" + ve.getClass() + ")"); } + + private static class ConsumerFactory { + static EvalConsumer createForMissingArg(Policy policy) { + final EvalConsumer coercer = + (MissingArgEval value, DoubleList receiver) -> receiver.add(0.0); + return createAny(coercer, policy); + } + + static EvalConsumer createForBoolEval(Policy policy) { + final EvalConsumer coercer = + (BoolEval value, DoubleList receiver) -> receiver.add(value.getNumberValue()); + return createAny(coercer, policy); + } + + static EvalConsumer createForBlank(Policy policy) { + final EvalConsumer coercer = + (BlankEval value, DoubleList receiver) -> receiver.add(0.0); + return createAny(coercer, policy); + } + + private static EvalConsumer createAny(EvalConsumer coercer, Policy policy) { + switch (policy) { + case COERCE: + return coercer; + case SKIP: + return doNothing(); + case ERROR: + return throwValueInvalid(); + default: + throw new AssertionError(); + } + } + + private static EvalConsumer doNothing() { + return (T value, DoubleList receiver) -> { + }; + } + + private static EvalConsumer throwValueInvalid() { + return (T value, DoubleList receiver) -> { + throw new EvaluationException(ErrorEval.VALUE_INVALID); + }; + } + } } diff --git a/src/testcases/org/apache/poi/hssf/model/TestOperandClassTransformer.java b/src/testcases/org/apache/poi/hssf/model/TestOperandClassTransformer.java index a6e83c77c4..5c9a935a0e 100644 --- a/src/testcases/org/apache/poi/hssf/model/TestOperandClassTransformer.java +++ b/src/testcases/org/apache/poi/hssf/model/TestOperandClassTransformer.java @@ -20,10 +20,15 @@ package org.apache.poi.hssf.model; import junit.framework.AssertionFailedError; import junit.framework.TestCase; +import org.apache.poi.ss.formula.eval.BlankEval; +import org.apache.poi.ss.formula.eval.ErrorEval; +import org.apache.poi.ss.formula.eval.NumberEval; +import org.apache.poi.ss.formula.eval.ValueEval; +import org.apache.poi.ss.formula.functions.EvalFactory; +import org.apache.poi.ss.formula.functions.MatrixFunction; import org.apache.poi.ss.formula.ptg.AbstractFunctionPtg; import org.apache.poi.ss.formula.ptg.FuncVarPtg; import org.apache.poi.ss.formula.ptg.Ptg; -import org.apache.poi.hssf.usermodel.HSSFWorkbook; /** * Tests specific formula examples in OperandClassTransformer. @@ -32,114 +37,127 @@ import org.apache.poi.hssf.usermodel.HSSFWorkbook; */ public final class TestOperandClassTransformer extends TestCase { - private static Ptg[] parseFormula(String formula) { - Ptg[] result = HSSFFormulaParser.parse(formula, null); - assertNotNull("Ptg array should not be null", result); - return result; - } - - public void testMdeterm() { - String formula = "MDETERM(ABS(A1))"; - Ptg[] ptgs = parseFormula(formula); - - confirmTokenClass(ptgs, 0, Ptg.CLASS_ARRAY); - confirmFuncClass(ptgs, 1, "ABS", Ptg.CLASS_ARRAY); - confirmFuncClass(ptgs, 2, "MDETERM", Ptg.CLASS_VALUE); - } - - /** - * In the example: INDEX(PI(),1), Excel encodes PI() as 'array'. It is not clear - * what rule justifies this. POI currently encodes it as 'value' which Excel(2007) seems to - * tolerate. Changing the metadata for INDEX to have first parameter as 'array' class breaks - * other formulas involving INDEX. It seems like a special case needs to be made. Perhaps an - * important observation is that INDEX is one of very few functions that returns 'reference' type. - * - * This test has been added but disabled in order to document this issue. - */ - public void DISABLED_testIndexPi1() { - String formula = "INDEX(PI(),1)"; - Ptg[] ptgs = parseFormula(formula); - - confirmFuncClass(ptgs, 1, "PI", Ptg.CLASS_ARRAY); // fails as of POI 3.1 - confirmFuncClass(ptgs, 2, "INDEX", Ptg.CLASS_VALUE); - } - - /** - * Even though count expects args of type R, because A1 is a direct operand of a - * value operator it must get type V - */ - public void testDirectOperandOfValueOperator() { - String formula = "COUNT(A1*1)"; - Ptg[] ptgs = parseFormula(formula); - if (ptgs[0].getPtgClass() == Ptg.CLASS_REF) { - throw new AssertionFailedError("Identified bug 45348"); - } - - confirmTokenClass(ptgs, 0, Ptg.CLASS_VALUE); - confirmTokenClass(ptgs, 3, Ptg.CLASS_VALUE); - } - - /** - * A cell ref passed to a function expecting type V should be converted to type V - */ - public void testRtoV() { - - String formula = "lookup(A1, A3:A52, B3:B52)"; - Ptg[] ptgs = parseFormula(formula); - confirmTokenClass(ptgs, 0, Ptg.CLASS_VALUE); - } - - public void testComplexIRR_bug45041() { - String formula = "(1+IRR(SUMIF(A:A,ROW(INDIRECT(MIN(A:A)&\":\"&MAX(A:A))),B:B),0))^365-1"; - Ptg[] ptgs = parseFormula(formula); - - FuncVarPtg rowFunc = (FuncVarPtg) ptgs[10]; - FuncVarPtg sumifFunc = (FuncVarPtg) ptgs[12]; - assertEquals("ROW", rowFunc.getName()); - assertEquals("SUMIF", sumifFunc.getName()); - - if (rowFunc.getPtgClass() == Ptg.CLASS_VALUE || sumifFunc.getPtgClass() == Ptg.CLASS_VALUE) { - throw new AssertionFailedError("Identified bug 45041"); - } - confirmTokenClass(ptgs, 1, Ptg.CLASS_REF); - confirmTokenClass(ptgs, 2, Ptg.CLASS_REF); - confirmFuncClass(ptgs, 3, "MIN", Ptg.CLASS_VALUE); - confirmTokenClass(ptgs, 6, Ptg.CLASS_REF); - confirmFuncClass(ptgs, 7, "MAX", Ptg.CLASS_VALUE); - confirmFuncClass(ptgs, 9, "INDIRECT", Ptg.CLASS_REF); - confirmFuncClass(ptgs, 10, "ROW", Ptg.CLASS_ARRAY); - confirmTokenClass(ptgs, 11, Ptg.CLASS_REF); - confirmFuncClass(ptgs, 12, "SUMIF", Ptg.CLASS_ARRAY); - confirmFuncClass(ptgs, 14, "IRR", Ptg.CLASS_VALUE); - } - - private void confirmFuncClass(Ptg[] ptgs, int i, String expectedFunctionName, byte operandClass) { - confirmTokenClass(ptgs, i, operandClass); - AbstractFunctionPtg afp = (AbstractFunctionPtg) ptgs[i]; - assertEquals(expectedFunctionName, afp.getName()); - } - - private void confirmTokenClass(Ptg[] ptgs, int i, byte operandClass) { - Ptg ptg = ptgs[i]; - if (ptg.isBaseToken()) { - throw new AssertionFailedError("ptg[" + i + "] is a base token"); - } - if (operandClass != ptg.getPtgClass()) { - throw new AssertionFailedError("Wrong operand class for ptg (" - + ptg + "). Expected " + getOperandClassName(operandClass) - + " but got " + getOperandClassName(ptg.getPtgClass())); - } - } - - private static String getOperandClassName(byte ptgClass) { - switch (ptgClass) { - case Ptg.CLASS_REF: - return "R"; - case Ptg.CLASS_VALUE: - return "V"; - case Ptg.CLASS_ARRAY: - return "A"; - } - throw new RuntimeException("Unknown operand class (" + ptgClass + ")"); - } + private static Ptg[] parseFormula(String formula) { + Ptg[] result = HSSFFormulaParser.parse(formula, null); + assertNotNull("Ptg array should not be null", result); + return result; + } + + public void testMdeterm() { + String formula = "MDETERM(ABS(A1))"; + Ptg[] ptgs = parseFormula(formula); + + confirmTokenClass(ptgs, 0, Ptg.CLASS_ARRAY); + confirmFuncClass(ptgs, 1, "ABS", Ptg.CLASS_ARRAY); + confirmFuncClass(ptgs, 2, "MDETERM", Ptg.CLASS_VALUE); + } + + public void testMdetermReturnsValueInvalidOnABlankCell() { + ValueEval matrixRef = EvalFactory.createAreaEval("A1:B2", + new ValueEval[]{ + BlankEval.instance, + new NumberEval(1), + new NumberEval(2), + new NumberEval(3) + } + ); + ValueEval result = MatrixFunction.MDETERM.evaluate(new ValueEval[]{matrixRef} , 0, 0); + assertEquals(ErrorEval.VALUE_INVALID, result); + } + + /** + * In the example: INDEX(PI(),1), Excel encodes PI() as 'array'. It is not clear + * what rule justifies this. POI currently encodes it as 'value' which Excel(2007) seems to + * tolerate. Changing the metadata for INDEX to have first parameter as 'array' class breaks + * other formulas involving INDEX. It seems like a special case needs to be made. Perhaps an + * important observation is that INDEX is one of very few functions that returns 'reference' type. + *

+ * This test has been added but disabled in order to document this issue. + */ + public void DISABLED_testIndexPi1() { + String formula = "INDEX(PI(),1)"; + Ptg[] ptgs = parseFormula(formula); + + confirmFuncClass(ptgs, 1, "PI", Ptg.CLASS_ARRAY); // fails as of POI 3.1 + confirmFuncClass(ptgs, 2, "INDEX", Ptg.CLASS_VALUE); + } + + /** + * Even though count expects args of type R, because A1 is a direct operand of a + * value operator it must get type V + */ + public void testDirectOperandOfValueOperator() { + String formula = "COUNT(A1*1)"; + Ptg[] ptgs = parseFormula(formula); + if (ptgs[0].getPtgClass() == Ptg.CLASS_REF) { + throw new AssertionFailedError("Identified bug 45348"); + } + + confirmTokenClass(ptgs, 0, Ptg.CLASS_VALUE); + confirmTokenClass(ptgs, 3, Ptg.CLASS_VALUE); + } + + /** + * A cell ref passed to a function expecting type V should be converted to type V + */ + public void testRtoV() { + + String formula = "lookup(A1, A3:A52, B3:B52)"; + Ptg[] ptgs = parseFormula(formula); + confirmTokenClass(ptgs, 0, Ptg.CLASS_VALUE); + } + + public void testComplexIRR_bug45041() { + String formula = "(1+IRR(SUMIF(A:A,ROW(INDIRECT(MIN(A:A)&\":\"&MAX(A:A))),B:B),0))^365-1"; + Ptg[] ptgs = parseFormula(formula); + + FuncVarPtg rowFunc = (FuncVarPtg) ptgs[10]; + FuncVarPtg sumifFunc = (FuncVarPtg) ptgs[12]; + assertEquals("ROW", rowFunc.getName()); + assertEquals("SUMIF", sumifFunc.getName()); + + if (rowFunc.getPtgClass() == Ptg.CLASS_VALUE || sumifFunc.getPtgClass() == Ptg.CLASS_VALUE) { + throw new AssertionFailedError("Identified bug 45041"); + } + confirmTokenClass(ptgs, 1, Ptg.CLASS_REF); + confirmTokenClass(ptgs, 2, Ptg.CLASS_REF); + confirmFuncClass(ptgs, 3, "MIN", Ptg.CLASS_VALUE); + confirmTokenClass(ptgs, 6, Ptg.CLASS_REF); + confirmFuncClass(ptgs, 7, "MAX", Ptg.CLASS_VALUE); + confirmFuncClass(ptgs, 9, "INDIRECT", Ptg.CLASS_REF); + confirmFuncClass(ptgs, 10, "ROW", Ptg.CLASS_ARRAY); + confirmTokenClass(ptgs, 11, Ptg.CLASS_REF); + confirmFuncClass(ptgs, 12, "SUMIF", Ptg.CLASS_ARRAY); + confirmFuncClass(ptgs, 14, "IRR", Ptg.CLASS_VALUE); + } + + private void confirmFuncClass(Ptg[] ptgs, int i, String expectedFunctionName, byte operandClass) { + confirmTokenClass(ptgs, i, operandClass); + AbstractFunctionPtg afp = (AbstractFunctionPtg) ptgs[i]; + assertEquals(expectedFunctionName, afp.getName()); + } + + private void confirmTokenClass(Ptg[] ptgs, int i, byte operandClass) { + Ptg ptg = ptgs[i]; + if (ptg.isBaseToken()) { + throw new AssertionFailedError("ptg[" + i + "] is a base token"); + } + if (operandClass != ptg.getPtgClass()) { + throw new AssertionFailedError("Wrong operand class for ptg (" + + ptg + "). Expected " + getOperandClassName(operandClass) + + " but got " + getOperandClassName(ptg.getPtgClass())); + } + } + + private static String getOperandClassName(byte ptgClass) { + switch (ptgClass) { + case Ptg.CLASS_REF: + return "R"; + case Ptg.CLASS_VALUE: + return "V"; + case Ptg.CLASS_ARRAY: + return "A"; + } + throw new RuntimeException("Unknown operand class (" + ptgClass + ")"); + } } diff --git a/src/testcases/org/apache/poi/ss/formula/functions/TestMultiOperandNumericFunction.java b/src/testcases/org/apache/poi/ss/formula/functions/TestMultiOperandNumericFunction.java index a54a69f85d..a03772086b 100644 --- a/src/testcases/org/apache/poi/ss/formula/functions/TestMultiOperandNumericFunction.java +++ b/src/testcases/org/apache/poi/ss/formula/functions/TestMultiOperandNumericFunction.java @@ -42,16 +42,26 @@ public class TestMultiOperandNumericFunction { } @Test - public void missingArgEvalsAreCountedAsZero() { - MultiOperandNumericFunction instance = new Stub(true, true); + public void missingArgEvalsAreCountedAsZeroIfPolicyIsCoerce() { + MultiOperandNumericFunction instance = new Stub(true, true, MultiOperandNumericFunction.Policy.COERCE); ValueEval result = instance.evaluate(new ValueEval[]{MissingArgEval.instance}, 0, 0); assertTrue(result instanceof NumberEval); assertEquals(0.0, ((NumberEval)result).getNumberValue(), 0); } + @Test + public void missingArgEvalsAreSkippedIfZeroIfPolicyIsSkipped() { + MultiOperandNumericFunction instance = new Stub(true, true, MultiOperandNumericFunction.Policy.SKIP); + ValueEval result = instance.evaluate(new ValueEval[]{new NumberEval(1), MissingArgEval.instance}, 0, 0); + assertTrue(result instanceof NumberEval); + assertEquals(1.0, ((NumberEval)result).getNumberValue(), 0); + } + private static class Stub extends MultiOperandNumericFunction { - protected Stub(boolean isReferenceBoolCounted, boolean isBlankCounted) { + protected Stub( + boolean isReferenceBoolCounted, boolean isBlankCounted, MultiOperandNumericFunction.Policy missingArgEvalPolicy) { super(isReferenceBoolCounted, isBlankCounted); + setMissingArgPolicy(missingArgEvalPolicy); } @Override diff --git a/src/testcases/org/apache/poi/ss/formula/functions/TestProduct.java b/src/testcases/org/apache/poi/ss/formula/functions/TestProduct.java new file mode 100644 index 0000000000..e4af3bd866 --- /dev/null +++ b/src/testcases/org/apache/poi/ss/formula/functions/TestProduct.java @@ -0,0 +1,70 @@ +/* ==================================================================== + 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 + limitations under the License. +==================================================================== */ +package org.apache.poi.ss.formula.functions; + +import org.apache.poi.ss.formula.eval.BoolEval; +import org.apache.poi.ss.formula.eval.MissingArgEval; +import org.apache.poi.ss.formula.eval.NumberEval; +import org.apache.poi.ss.formula.eval.StringEval; +import org.apache.poi.ss.formula.eval.ValueEval; +import org.junit.Test; + +import static org.junit.Assert.assertEquals; +import static org.junit.Assert.assertTrue; + +public class TestProduct { + @Test + public void missingArgsAreIgnored() { + ValueEval result = getInstance().evaluate(new ValueEval[]{new NumberEval(2.0), MissingArgEval.instance}, 0, 0); + assertTrue(result instanceof NumberEval); + assertEquals(2, ((NumberEval)result).getNumberValue(), 0); + } + + /** + * Actually PRODUCT() requires at least one arg but the checks are performed elsewhere. + * However, PRODUCT(,) is a valid call (which should return 0). So it makes sense to + * assert that PRODUCT() is also 0 (at least, nothing explodes). + */ + public void missingArgEvalReturns0() { + ValueEval result = getInstance().evaluate(new ValueEval[0], 0, 0); + assertTrue(result instanceof NumberEval); + assertEquals(0, ((NumberEval)result).getNumberValue(), 0); + } + + @Test + public void twoMissingArgEvalsReturn0() { + ValueEval result = getInstance().evaluate(new ValueEval[]{MissingArgEval.instance, MissingArgEval.instance}, 0, 0); + assertTrue(result instanceof NumberEval); + assertEquals(0, ((NumberEval)result).getNumberValue(), 0); + } + + @Test + public void acceptanceTest() { + final ValueEval[] args = { + new NumberEval(2.0), + MissingArgEval.instance, + new StringEval("6"), + BoolEval.TRUE}; + ValueEval result = getInstance().evaluate(args, 0, 0); + assertTrue(result instanceof NumberEval); + assertEquals(12, ((NumberEval)result).getNumberValue(), 0); + } + + private static Function getInstance() { + return AggregateFunction.PRODUCT; + } +}