Bugzilla 55037: DELTA function support
git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1488730 13f79535-47bb-0310-9956-ffa450edef68
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src/java/org/apache/poi/ss/formula/functions/Delta.java
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src/java/org/apache/poi/ss/formula/functions/Delta.java
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/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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package org.apache.poi.ss.formula.functions;
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import org.apache.poi.ss.formula.eval.*;
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import java.math.BigDecimal;
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/**
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* Implementation for Excel DELTA() function.<p/>
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* <p/>
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* <b>Syntax</b>:<br/> <b>DELTA </b>(<b>number1</b>,<b>number2</b> )<br/>
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* <p/>
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* Tests whether two values are equal. Returns 1 if number1 = number2; returns 0 otherwise.
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* Use this function to filter a set of values. For example, by summing several DELTA functions
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* you calculate the count of equal pairs. This function is also known as the Kronecker Delta function.
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*
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* <ul>
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* <li>If number1 is nonnumeric, DELTA returns the #VALUE! error value.</li>
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* <li>If number2 is nonnumeric, DELTA returns the #VALUE! error value.</li>
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* </ul>
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*
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* @author cedric dot walter @ gmail dot com
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*/
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public final class Delta extends Fixed2ArgFunction {
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private final static NumberEval ONE = new NumberEval(1);
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private final static NumberEval ZERO = new NumberEval(0);
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@Override
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public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg1, ValueEval arg2) {
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ValueEval veText1;
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try {
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veText1 = OperandResolver.getSingleValue(arg1, srcRowIndex, srcColumnIndex);
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} catch (EvaluationException e) {
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return e.getErrorEval();
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}
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String strText1 = OperandResolver.coerceValueToString(veText1);
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Double number1 = OperandResolver.parseDouble(strText1);
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if (number1 == null) {
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return ErrorEval.VALUE_INVALID;
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}
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ValueEval veText2;
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try {
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veText2 = OperandResolver.getSingleValue(arg2, srcRowIndex, srcColumnIndex);
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} catch (EvaluationException e) {
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return e.getErrorEval();
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}
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String strText2 = OperandResolver.coerceValueToString(veText2);
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Double number2 = OperandResolver.parseDouble(strText2);
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if (number2 == null) {
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return ErrorEval.VALUE_INVALID;
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}
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int result = new BigDecimal(number1.doubleValue()).compareTo(new BigDecimal(number2.doubleValue()));
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return result == 0 ? ONE : ZERO;
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}
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}
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/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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package org.apache.poi.ss.formula.functions;
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import junit.framework.TestCase;
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import org.apache.poi.ss.formula.eval.ErrorEval;
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import org.apache.poi.ss.formula.eval.NumberEval;
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import org.apache.poi.ss.formula.eval.StringEval;
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import org.apache.poi.ss.formula.eval.ValueEval;
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/**
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* Tests for {@link org.apache.poi.ss.formula.functions.Delta}
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*
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* @author cedric dot walter @ gmail dot com
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*/
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public final class TestDelta extends TestCase {
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private static ValueEval invokeValue(String number1, String number2) {
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ValueEval[] args = new ValueEval[] { new StringEval(number1), new StringEval(number2), };
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return new Delta().evaluate(args, -1, -1);
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}
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private static void confirmValue(String number1, String number2, double expected) {
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ValueEval result = invokeValue(number1, number2);
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assertEquals(NumberEval.class, result.getClass());
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assertEquals(expected, ((NumberEval) result).getNumberValue(), 0.0);
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}
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private static void confirmValueError(String number1, String number2) {
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ValueEval result = invokeValue(number1, number2);
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assertEquals(ErrorEval.class, result.getClass());
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assertEquals(ErrorEval.VALUE_INVALID, result);
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}
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public void testBasic() {
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confirmValue("5","4", 0); // Checks whether 5 equals 4 (0)
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confirmValue("5","5", 1); // Checks whether 5 equals 5 (1)
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confirmValue("0.5","0", 0); // Checks whether 0.5 equals 0 (0)
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confirmValue("0.50","0.5", 1);
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confirmValue("0.5000000000","0.5", 1);
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}
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public void testErrors() {
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confirmValueError("A1","B2");
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confirmValueError("AAAA","BBBB");
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}
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}
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