Bugzilla 55037: DELTA function support

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1488730 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Yegor Kozlov 2013-06-02 15:30:58 +00:00
parent e5cfade841
commit c119f35388
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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
limitations under the License.
==================================================================== */
package org.apache.poi.ss.formula.functions;
import org.apache.poi.ss.formula.eval.*;
import java.math.BigDecimal;
/**
* Implementation for Excel DELTA() function.<p/>
* <p/>
* <b>Syntax</b>:<br/> <b>DELTA </b>(<b>number1</b>,<b>number2</b> )<br/>
* <p/>
* Tests whether two values are equal. Returns 1 if number1 = number2; returns 0 otherwise.
* Use this function to filter a set of values. For example, by summing several DELTA functions
* you calculate the count of equal pairs. This function is also known as the Kronecker Delta function.
*
* <ul>
* <li>If number1 is nonnumeric, DELTA returns the #VALUE! error value.</li>
* <li>If number2 is nonnumeric, DELTA returns the #VALUE! error value.</li>
* </ul>
*
* @author cedric dot walter @ gmail dot com
*/
public final class Delta extends Fixed2ArgFunction {
private final static NumberEval ONE = new NumberEval(1);
private final static NumberEval ZERO = new NumberEval(0);
@Override
public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg1, ValueEval arg2) {
ValueEval veText1;
try {
veText1 = OperandResolver.getSingleValue(arg1, srcRowIndex, srcColumnIndex);
} catch (EvaluationException e) {
return e.getErrorEval();
}
String strText1 = OperandResolver.coerceValueToString(veText1);
Double number1 = OperandResolver.parseDouble(strText1);
if (number1 == null) {
return ErrorEval.VALUE_INVALID;
}
ValueEval veText2;
try {
veText2 = OperandResolver.getSingleValue(arg2, srcRowIndex, srcColumnIndex);
} catch (EvaluationException e) {
return e.getErrorEval();
}
String strText2 = OperandResolver.coerceValueToString(veText2);
Double number2 = OperandResolver.parseDouble(strText2);
if (number2 == null) {
return ErrorEval.VALUE_INVALID;
}
int result = new BigDecimal(number1.doubleValue()).compareTo(new BigDecimal(number2.doubleValue()));
return result == 0 ? ONE : ZERO;
}
}

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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
limitations under the License.
==================================================================== */
package org.apache.poi.ss.formula.functions;
import junit.framework.TestCase;
import org.apache.poi.ss.formula.eval.ErrorEval;
import org.apache.poi.ss.formula.eval.NumberEval;
import org.apache.poi.ss.formula.eval.StringEval;
import org.apache.poi.ss.formula.eval.ValueEval;
/**
* Tests for {@link org.apache.poi.ss.formula.functions.Delta}
*
* @author cedric dot walter @ gmail dot com
*/
public final class TestDelta extends TestCase {
private static ValueEval invokeValue(String number1, String number2) {
ValueEval[] args = new ValueEval[] { new StringEval(number1), new StringEval(number2), };
return new Delta().evaluate(args, -1, -1);
}
private static void confirmValue(String number1, String number2, double expected) {
ValueEval result = invokeValue(number1, number2);
assertEquals(NumberEval.class, result.getClass());
assertEquals(expected, ((NumberEval) result).getNumberValue(), 0.0);
}
private static void confirmValueError(String number1, String number2) {
ValueEval result = invokeValue(number1, number2);
assertEquals(ErrorEval.class, result.getClass());
assertEquals(ErrorEval.VALUE_INVALID, result);
}
public void testBasic() {
confirmValue("5","4", 0); // Checks whether 5 equals 4 (0)
confirmValue("5","5", 1); // Checks whether 5 equals 5 (1)
confirmValue("0.5","0", 0); // Checks whether 0.5 equals 0 (0)
confirmValue("0.50","0.5", 1);
confirmValue("0.5000000000","0.5", 1);
}
public void testErrors() {
confirmValueError("A1","B2");
confirmValueError("AAAA","BBBB");
}
}