BigDecimals：修复 equalsValue 方法第二个参数为 null 报空指针的问题；补充单元测试
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65f0bb062c
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10761e92ec
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@ -21,19 +21,27 @@ import java.math.BigDecimal;
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import javax.annotation.Nonnull;
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import javax.annotation.Nullable;
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import com.google.common.base.Preconditions;
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import xyz.zhouxy.plusone.commons.annotation.StaticFactoryMethod;
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/**
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* BigDecimals
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*
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* <p>
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* BigDecimal 工具类
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* </p>
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*
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* @author <a href="http://zhouxy.xyz:3000/ZhouXY108">ZhouXY</a>
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* @since 0.1.0
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*/
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public class BigDecimals {
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public static boolean equalsValue(@Nullable BigDecimal a, @Nullable BigDecimal b) {
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return (a == b) || (a != null && a.compareTo(b) == 0);
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return (a == b) || (a != null && b != null && a.compareTo(b) == 0);
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}
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public static boolean gt(BigDecimal a, BigDecimal b) {
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Preconditions.checkNotNull(a, "Parameter could not be null.");
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Preconditions.checkNotNull(b, "Parameter could not be null.");
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AssertTools.checkNotNull(a, "Parameter could not be null.");
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AssertTools.checkNotNull(b, "Parameter could not be null.");
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return (a != b) && (a.compareTo(b) > 0);
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}
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@ -42,8 +50,8 @@ public class BigDecimals {
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}
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public static boolean lt(BigDecimal a, BigDecimal b) {
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Preconditions.checkNotNull(a, "Parameter could not be null.");
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Preconditions.checkNotNull(b, "Parameter could not be null.");
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AssertTools.checkNotNull(a, "Parameter could not be null.");
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AssertTools.checkNotNull(b, "Parameter could not be null.");
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return (a != b) && (a.compareTo(b) < 0);
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}
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@ -16,11 +16,9 @@
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package xyz.zhouxy.plusone.commons.util;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.*;
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import java.math.BigDecimal;
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import java.math.RoundingMode;
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import java.util.function.Function;
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import org.junit.jupiter.api.Test;
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@ -29,76 +27,178 @@ import lombok.extern.slf4j.Slf4j;
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@Slf4j
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public class BigDecimalsTests {
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// TODO 【优化】 检查测试用例
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@Test
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void testToPlainString() {
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BigDecimalFormatter formatter = BigDecimalFormatter.builder()
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.setScale(2, RoundingMode.HALF_UP)
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.stripTrailingZeros()
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.build();
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assertEquals("8.09", formatter.toPlainString(BigDecimals.of("8.090")));
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assertEquals("8.09", formatter.toPlainString(BigDecimals.of("8.094")));
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assertEquals("8.1", formatter.toPlainString(BigDecimals.of("8.095")));
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assertEquals("8.1", formatter.toPlainString(BigDecimals.of("8.096")));
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assertEquals("8.1", formatter.toPlainString(BigDecimals.of("8.100")));
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void equalsValue_NullValues_ReturnsTrue() {
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assertTrue(BigDecimals.equalsValue(null, null));
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}
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@Test
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void test() {
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Object a = 100 % 3.0;
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log.info("a: {}", a);
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}
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}
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class BigDecimalFormatter {
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private final Function<BigDecimal, BigDecimal> func;
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private BigDecimalFormatter(Function<BigDecimal, BigDecimal> wholeFunc) {
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this.func = wholeFunc;
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}
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public static Builder builder() {
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return new Builder();
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}
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public String toPlainString(BigDecimal value) {
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final BigDecimal finalDecimal = func == null ? value : func.apply(value);
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return finalDecimal.toPlainString();
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}
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public String toEngineeringString(BigDecimal value) {
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final BigDecimal finalDecimal = func == null ? value : func.apply(value);
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return finalDecimal.toEngineeringString();
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}
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public static class Builder {
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private Function<BigDecimal, BigDecimal> wholeFunc;
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private Builder() {
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}
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public Builder setScale(int newScale, RoundingMode roundingMode) {
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final Function<BigDecimal, BigDecimal> func = value -> value.setScale(newScale, roundingMode);
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if (wholeFunc == null) {
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wholeFunc = func;
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} else {
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wholeFunc = func.andThen(func);
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}
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return this;
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}
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public Builder stripTrailingZeros() {
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if (wholeFunc == null) {
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wholeFunc = BigDecimal::stripTrailingZeros;
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} else {
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wholeFunc = wholeFunc.andThen(BigDecimal::stripTrailingZeros);
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}
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return this;
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}
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public BigDecimalFormatter build() {
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return new BigDecimalFormatter(wholeFunc);
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}
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void equalsValue_SameNonNullableValues_ReturnsTrue() {
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BigDecimal bd1 = new BigDecimal("10");
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BigDecimal bd2 = new BigDecimal("10.0");
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assertTrue(BigDecimals.equalsValue(bd1, bd2));
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}
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@Test
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void equalsValue_DifferentNonNullableValues_ReturnsFalse() {
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BigDecimal bd1 = new BigDecimal("10");
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BigDecimal bd2 = new BigDecimal("20");
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assertFalse(BigDecimals.equalsValue(bd1, bd2));
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}
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@Test
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void equalsValue_OneNullOneNonNullValue_ReturnsFalse() {
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BigDecimal bd = new BigDecimal("10");
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assertFalse(BigDecimals.equalsValue(bd, null));
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assertFalse(BigDecimals.equalsValue(null, bd));
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}
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@Test
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void gt_NullFirstValue_ThrowsException() {
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BigDecimal bd = new BigDecimal("10");
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assertThrows(NullPointerException.class, () -> BigDecimals.gt(null, bd));
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}
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@Test
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void gt_NullSecondValue_ThrowsException() {
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BigDecimal bd = new BigDecimal("10");
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assertThrows(NullPointerException.class, () -> BigDecimals.gt(bd, null));
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}
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@Test
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void gt_SameValues_ReturnsFalse() {
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BigDecimal bd = new BigDecimal("10");
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assertFalse(BigDecimals.gt(bd, bd));
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}
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@Test
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void gt_FirstGreaterThanSecond_ReturnsTrue() {
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BigDecimal bd1 = new BigDecimal("20");
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BigDecimal bd2 = new BigDecimal("10");
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assertTrue(BigDecimals.gt(bd1, bd2));
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}
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@Test
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void ge_NullFirstValue_ThrowsException() {
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BigDecimal bd = new BigDecimal("10");
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assertThrows(NullPointerException.class, () -> BigDecimals.ge(null, bd));
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}
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@Test
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void ge_NullSecondValue_ThrowsException() {
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BigDecimal bd = new BigDecimal("10");
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assertThrows(NullPointerException.class, () -> BigDecimals.ge(bd, null));
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}
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@Test
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void ge_SameValues_ReturnsTrue() {
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BigDecimal bd = new BigDecimal("10");
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assertTrue(BigDecimals.ge(bd, bd));
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}
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@Test
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void ge_FirstGreaterThanSecond_ReturnsTrue() {
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BigDecimal bd1 = new BigDecimal("20");
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BigDecimal bd2 = new BigDecimal("10");
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assertTrue(BigDecimals.ge(bd1, bd2));
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}
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@Test
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void lt_NullFirstValue_ThrowsException() {
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BigDecimal bd = new BigDecimal("10");
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assertThrows(NullPointerException.class, () -> BigDecimals.lt(null, bd));
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}
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@Test
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void lt_NullSecondValue_ThrowsException() {
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BigDecimal bd = new BigDecimal("10");
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assertThrows(NullPointerException.class, () -> BigDecimals.lt(bd, null));
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}
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@Test
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void lt_SameValues_ReturnsFalse() {
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BigDecimal bd = new BigDecimal("10");
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assertFalse(BigDecimals.lt(bd, bd));
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}
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@Test
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void lt_FirstLessThanSecond_ReturnsTrue() {
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BigDecimal bd1 = new BigDecimal("10");
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BigDecimal bd2 = new BigDecimal("20");
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assertTrue(BigDecimals.lt(bd1, bd2));
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}
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@Test
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void le_NullFirstValue_ThrowsException() {
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BigDecimal bd = new BigDecimal("10");
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assertThrows(NullPointerException.class, () -> BigDecimals.le(null, bd));
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}
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@Test
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void le_NullSecondValue_ThrowsException() {
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BigDecimal bd = new BigDecimal("10");
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assertThrows(NullPointerException.class, () -> BigDecimals.le(bd, null));
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}
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@Test
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void le_SameValues_ReturnsTrue() {
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BigDecimal bd = new BigDecimal("10");
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assertTrue(BigDecimals.le(bd, bd));
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}
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@Test
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void le_FirstLessThanSecond_ReturnsTrue() {
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BigDecimal bd1 = new BigDecimal("10");
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BigDecimal bd2 = new BigDecimal("20");
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assertTrue(BigDecimals.le(bd1, bd2));
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}
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@Test
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void sum_NullArray_ReturnsZero() {
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assertEquals(BigDecimal.ZERO, BigDecimals.sum());
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}
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@Test
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void sum_SingleNonNullValue_ReturnsSameValue() {
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BigDecimal bd = new BigDecimal("10");
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assertEquals(bd, BigDecimals.sum(bd));
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}
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@Test
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void sum_SingleNullValue_ReturnsZero() {
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assertEquals(BigDecimal.ZERO, BigDecimals.sum((BigDecimal) null));
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}
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@Test
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void sum_MultipleValues_ReturnsCorrectSum() {
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BigDecimal bd1 = new BigDecimal("10");
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BigDecimal bd2 = new BigDecimal("20");
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BigDecimal bd3 = new BigDecimal("30");
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assertEquals(new BigDecimal("60"), BigDecimals.sum(bd1, bd2, bd3));
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}
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@Test
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void nullToZero_NullValue_ReturnsZero() {
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assertEquals(BigDecimal.ZERO, BigDecimals.nullToZero(null));
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}
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@Test
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void nullToZero_NonNullValue_ReturnsSameValue() {
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BigDecimal bd = new BigDecimal("10");
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assertEquals(bd, BigDecimals.nullToZero(bd));
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}
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@Test
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void of_BlankString_ReturnsZero() {
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assertEquals(BigDecimal.ZERO, BigDecimals.of(" "));
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}
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@Test
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void of_NonBlankString_ReturnsCorrectBigDecimal() {
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BigDecimal bd = new BigDecimal("10");
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assertEquals(bd, BigDecimals.of("10"));
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}
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}
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