AgeCalculator changesJava-618 Restore RootCauseFinder code
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package com.baeldung.exceptions;
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import java.time.LocalDate;
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import java.time.Period;
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import java.time.format.DateTimeParseException;
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import java.util.Objects;
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/**
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* Utility class to find root cause exceptions.
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*/
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public class RootCauseFinder {
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public static Throwable findCauseUsingPlainJava(Throwable throwable) {
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Objects.requireNonNull(throwable);
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Throwable rootCause = throwable;
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while (rootCause.getCause() != null) {
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rootCause = rootCause.getCause();
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}
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return rootCause;
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}
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/**
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* Calculates the age of a person from a given date.
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*/
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static class AgeCalculator {
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private AgeCalculator() {
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}
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public static int calculateAge(String birthDate) throws CalculationException {
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if (birthDate == null || birthDate.isEmpty()) {
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throw new IllegalArgumentException();
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}
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try {
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return Period
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.between(parseDate(birthDate), LocalDate.now())
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.getYears();
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} catch (DateParseException ex) {
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throw new CalculationException(ex);
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}
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}
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private static LocalDate parseDate(String birthDateAsString) throws DateParseException {
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LocalDate birthDate;
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try {
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birthDate = LocalDate.parse(birthDateAsString);
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} catch (DateTimeParseException ex) {
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throw new InvalidFormatException(birthDateAsString, ex);
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}
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if (birthDate.isAfter(LocalDate.now())) {
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throw new DateOutOfRangeException(birthDateAsString);
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}
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return birthDate;
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}
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}
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static class CalculationException extends Exception {
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CalculationException(DateParseException ex) {
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super(ex);
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}
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}
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static class DateParseException extends Exception {
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DateParseException(String input) {
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super(input);
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}
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DateParseException(String input, Throwable thr) {
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super(input, thr);
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}
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}
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static class InvalidFormatException extends DateParseException {
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InvalidFormatException(String input, Throwable thr) {
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super("Invalid date format: " + input, thr);
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}
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}
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static class DateOutOfRangeException extends DateParseException {
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DateOutOfRangeException(String date) {
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super("Date out of range: " + date);
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}
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}
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}
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@ -0,0 +1,96 @@
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package com.baeldung.exceptions;
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import com.google.common.base.Throwables;
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import org.apache.commons.lang3.exception.ExceptionUtils;
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import org.junit.jupiter.api.Assertions;
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import org.junit.jupiter.api.Test;
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import java.time.LocalDate;
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import java.time.format.DateTimeParseException;
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import java.time.temporal.ChronoUnit;
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import static com.baeldung.exceptions.RootCauseFinder.*;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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/**
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* Tests the {@link RootCauseFinder}.
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*/
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public class RootCauseFinderTest {
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@Test
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public void givenBirthDate_whenCalculatingAge_thenAgeReturned() {
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try {
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int age = AgeCalculator.calculateAge("1990-01-01");
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Assertions.assertEquals(1990, LocalDate
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.now()
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.minus(age, ChronoUnit.YEARS)
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.getYear());
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} catch (CalculationException e) {
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Assertions.fail(e.getMessage());
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}
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}
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@Test
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public void givenWrongFormatDate_whenFindingRootCauseUsingJava_thenRootCauseFound() {
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try {
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AgeCalculator.calculateAge("010102");
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} catch (CalculationException ex) {
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assertTrue(findCauseUsingPlainJava(ex) instanceof DateTimeParseException);
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}
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}
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@Test
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public void givenOutOfRangeDate_whenFindingRootCauseUsingJava_thenRootCauseFound() {
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try {
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AgeCalculator.calculateAge("2020-04-04");
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} catch (CalculationException ex) {
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assertTrue(findCauseUsingPlainJava(ex) instanceof DateOutOfRangeException);
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}
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}
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@Test
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public void givenNullDate_whenFindingRootCauseUsingJava_thenRootCauseFound() {
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try {
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AgeCalculator.calculateAge(null);
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} catch (Exception ex) {
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assertTrue(findCauseUsingPlainJava(ex) instanceof IllegalArgumentException);
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}
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}
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@Test
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public void givenWrongFormatDate_whenFindingRootCauseUsingApacheCommons_thenRootCauseFound() {
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try {
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AgeCalculator.calculateAge("010102");
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} catch (CalculationException ex) {
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assertTrue(ExceptionUtils.getRootCause(ex) instanceof DateTimeParseException);
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}
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}
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@Test
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public void givenOutOfRangeDate_whenFindingRootCauseUsingApacheCommons_thenRootCauseFound() {
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try {
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AgeCalculator.calculateAge("2020-04-04");
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} catch (CalculationException ex) {
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assertTrue(ExceptionUtils.getRootCause(ex) instanceof DateOutOfRangeException);
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}
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}
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@Test
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public void givenWrongFormatDate_whenFindingRootCauseUsingGuava_thenRootCauseFound() {
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try {
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AgeCalculator.calculateAge("010102");
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} catch (CalculationException ex) {
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assertTrue(Throwables.getRootCause(ex) instanceof DateTimeParseException);
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}
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}
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@Test
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public void givenOutOfRangeDate_whenFindingRootCauseUsingGuava_thenRootCauseFound() {
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try {
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AgeCalculator.calculateAge("2020-04-04");
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} catch (CalculationException ex) {
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assertTrue(Throwables.getRootCause(ex) instanceof DateOutOfRangeException);
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}
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}
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}
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