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Commit 89dddae

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marcos-lgmikr
marcos-lg
authored and
mikr
committed
changed example for finder of root cause exception
1 parent 0d96085 commit 89dddae
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‎core-java-modules/core-java-lang-2/src/test/java/com/baeldung/exceptions/RootCauseFinder.java‎

Copy file name to clipboardExpand all lines: core-java-modules/core-java-lang-2/src/test/java/com/baeldung/exceptions/RootCauseFinder.java
+51-17Lines changed: 51 additions & 17 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,8 @@
11
package com.baeldung.exceptions;
22

3+
import java.time.LocalDate;
4+
import java.time.Period;
5+
import java.time.format.DateTimeParseException;
36
import java.util.Objects;
47

58
/**
@@ -16,44 +19,75 @@ public static Throwable findCauseUsingPlainJava(Throwable throwable) {
1619
return rootCause;
1720
}
1821

19-
static class IntParser {
22+
/**
23+
* Calculates the age of a person from a given date.
24+
*/
25+
static class AgeCalculator {
2026

21-
private IntParser() {
27+
private AgeCalculator() {
2228
}
2329

24-
public static int parse(String input) throws InvalidNumber {
25-
if (input == null || input.isEmpty()) {
30+
public static int calculateAge(String birthDate) throws CalculationException {
31+
if (birthDate == null || birthDate.isEmpty()) {
2632
throw new IllegalArgumentException();
2733
}
2834

2935
try {
30-
return new IntParser().stringToInt(input.trim());
31-
} catch (NaNException ex) {
32-
throw new InvalidNumber(input, ex);
36+
return calculateDifference(birthDate).getYears();
37+
} catch (DateParseException ex) {
38+
throw new CalculationException(ex);
3339
}
3440
}
3541

36-
private int stringToInt(String numberAsString) throws NaNException {
42+
private static Period calculateDifference(String birthDateAsString) throws DateParseException {
43+
44+
LocalDate birthDate = null;
3745
try {
38-
return Integer.valueOf(numberAsString);
39-
} catch (NumberFormatException ex) {
40-
throw new NaNException(numberAsString, ex);
46+
birthDate = LocalDate.parse(birthDateAsString);
47+
} catch (DateTimeParseException ex) {
48+
throw new InvalidFormatException(birthDateAsString, ex);
49+
}
50+
51+
LocalDate today = LocalDate.now();
52+
53+
if (birthDate.isAfter(today)) {
54+
throw new DateOutOfRangeException(birthDateAsString);
4155
}
56+
57+
return Period.between(birthDate, today);
4258
}
4359

4460
}
4561

46-
static class InvalidNumber extends Exception {
62+
static class CalculationException extends Exception {
63+
64+
CalculationException(DateParseException ex) {
65+
super(ex);
66+
}
67+
}
68+
69+
static class DateParseException extends Exception {
70+
71+
DateParseException(String input) {
72+
super(input);
73+
}
74+
75+
DateParseException(String input, Throwable thr) {
76+
super(input, thr);
77+
}
78+
}
79+
80+
static class InvalidFormatException extends DateParseException {
4781

48-
InvalidNumber(String input, Throwable thr) {
49-
super("Invalid input for a number: " + input, thr);
82+
InvalidFormatException(String input, Throwable thr) {
83+
super("Invalid date format: " + input, thr);
5084
}
5185
}
5286

53-
static class NaNException extends Exception {
87+
static class DateOutOfRangeException extends DateParseException {
5488

55-
NaNException(String number, Throwable thr) {
56-
super(number + "is not a number", thr);
89+
DateOutOfRangeException(String date) {
90+
super("Date out of range: " + date);
5791
}
5892

5993
}
Collapse file

‎core-java-modules/core-java/src/test/java/com/baeldung/exceptions/RootCauseFinderTest.java‎

Copy file name to clipboardExpand all lines: core-java-modules/core-java/src/test/java/com/baeldung/exceptions/RootCauseFinderTest.java
+43-14Lines changed: 43 additions & 14 deletions
Original file line numberDiff line numberDiff line change
@@ -4,6 +4,8 @@
44
import org.apache.commons.lang3.exception.ExceptionUtils;
55
import org.junit.jupiter.api.Test;
66

7+
import java.time.format.DateTimeParseException;
8+
79
import static com.baeldung.exceptions.RootCauseFinder.*;
810
import static org.junit.jupiter.api.Assertions.assertTrue;
911

@@ -13,38 +15,65 @@
1315
public class RootCauseFinderTest {
1416

1517
@Test
16-
public void givenNestedException_whenFindingRootCauseUsingJava_thenRootCauseFound() {
18+
public void givenWrongFormatDate_whenFindingRootCauseUsingJava_thenRootCauseFound() {
19+
try {
20+
AgeCalculator.calculateAge("010102");
21+
} catch (CalculationException ex) {
22+
assertTrue(findCauseUsingPlainJava(ex) instanceof DateTimeParseException);
23+
}
24+
}
25+
26+
@Test
27+
public void givenOutOfRangeDate_whenFindingRootCauseUsingJava_thenRootCauseFound() {
1728
try {
18-
IntParser.parse("text");
19-
} catch (InvalidNumber ex) {
20-
assertTrue(findCauseUsingPlainJava(ex) instanceof NumberFormatException);
29+
AgeCalculator.calculateAge("2020-04-04");
30+
} catch (CalculationException ex) {
31+
assertTrue(findCauseUsingPlainJava(ex) instanceof DateOutOfRangeException);
2132
}
2233
}
2334

2435
@Test
25-
public void givenNonNestedException_whenFindingRootCauseUsingJava_thenRootCauseFound() {
36+
public void givenNullDate_whenFindingRootCauseUsingJava_thenRootCauseFound() {
2637
try {
27-
IntParser.parse(null);
38+
AgeCalculator.calculateAge(null);
2839
} catch (Exception ex) {
2940
assertTrue(findCauseUsingPlainJava(ex) instanceof IllegalArgumentException);
3041
}
3142
}
3243

3344
@Test
34-
public void givenNestedException_whenFindingRootCauseUsingApacheCommons_thenRootCauseFound() {
45+
public void givenWrongFormatDate_whenFindingRootCauseUsingApacheCommons_thenRootCauseFound() {
46+
try {
47+
AgeCalculator.calculateAge("010102");
48+
} catch (CalculationException ex) {
49+
assertTrue(ExceptionUtils.getRootCause(ex) instanceof DateTimeParseException);
50+
}
51+
}
52+
53+
@Test
54+
public void givenOutOfRangeDate_whenFindingRootCauseUsingApacheCommons_thenRootCauseFound() {
55+
try {
56+
AgeCalculator.calculateAge("2020-04-04");
57+
} catch (CalculationException ex) {
58+
assertTrue(ExceptionUtils.getRootCause(ex) instanceof DateOutOfRangeException);
59+
}
60+
}
61+
62+
@Test
63+
public void givenWrongFormatDate_whenFindingRootCauseUsingGuava_thenRootCauseFound() {
3564
try {
36-
IntParser.parse("text");
37-
} catch (InvalidNumber ex) {
38-
assertTrue(ExceptionUtils.getRootCause(ex) instanceof NumberFormatException);
65+
AgeCalculator.calculateAge("010102");
66+
} catch (CalculationException ex) {
67+
assertTrue(Throwables.getRootCause(ex) instanceof DateTimeParseException);
3968
}
4069
}
4170

4271
@Test
43-
public void givenNestedException_whenFindingRootCauseUsingGuava_thenRootCauseFound() {
72+
public void givenOutOfRangeDate_whenFindingRootCauseUsingGuava_thenRootCauseFound() {
4473
try {
45-
IntParser.parse("text");
46-
} catch (InvalidNumber ex) {
47-
assertTrue(Throwables.getRootCause(ex) instanceof NumberFormatException);
74+
AgeCalculator.calculateAge("2020-04-04");
75+
} catch (CalculationException ex) {
76+
assertTrue(Throwables.getRootCause(ex) instanceof DateOutOfRangeException);
4877
}
4978
}
5079

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