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DecimalMultiplicationTest.java
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DecimalMultiplicationTest.java
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/* Copyright (c) 2020 Seva Safris, LibJ
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* You should have received a copy of The MIT License (MIT) along with this
* program. If not, see <http://opensource.org/licenses/MIT/>.
*/
package org.libj.math;
import static org.libj.math.survey.AuditMode.*;
import java.math.BigDecimal;
import java.math.BigInteger;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.libj.math.survey.AuditReport;
import org.libj.math.survey.AuditRunner;
@RunWith(AuditRunner.class)
@AuditRunner.Execution(PHASED)
@AuditRunner.Instrument(a = {BigDecimal.class, BigInteger.class}, b = int[].class)
@AuditRunner.Instrument(a = {Decimal.class, BigInt.class}, b = int[].class)
public class DecimalMultiplicationTest extends DecimalTest {
@Test
public void testMul(final AuditReport report) {
report.addComment(UNINSTRUMENTED.ordinal(), "Multiply `T` by `T`.");
report.addComment(UNINSTRUMENTED.ordinal(), "`BigDecimal` outperforms `Decimal` in runtime performance due to the fact that `BigInteger.multiplyToLen(...)` is implemented as an intrinsic, which proves to beat `BigInt`'s critical native implementation of the same algorithm.");
report.addComment(UNINSTRUMENTED.ordinal(), "`Decimal` outperforms `long` in runtime performance in lieu of the need to encode and decode the decimal value from a `long`-encoded number.");
report.addComment(UNINSTRUMENTED.ordinal(), "`Decimal` outperform `BigDecimal` in heap allocation by requiring no more than the single `Decimal` instance and zero `int[]` instances for all operations.");
report.addComment(UNINSTRUMENTED.ordinal(), "`long` outperform `Decimal` and `BigDecimal` in heap allocation by avoiding heap allocation entirely for all operations.");
final long defaultValue = random.nextLong();
test("mul").withAuditReport(report)
.withCases(
d(BigDecimal.class, (final long a, final long b) -> toBigDecimal(a).multiply(toBigDecimal(b)), o -> o),
d(Decimal.class, (final long a, final long b) -> toDecimal(a).mul(toDecimal(b)), o -> o),
d(long.class, (final long a, final long b) -> Decimal.mul(a, b, defaultValue), (final long o) -> o == defaultValue ? null : o));
}
}