code moved from core-java to core-java-exceptions

core-java-modules/core-java/src/main/java/com/baeldung/exceptions/RootCauseFinder.java

@@ -1,98 +0,0 @@
-package com.baeldung.exceptions;
-
-import java.time.LocalDate;
-import java.time.Period;
-import java.time.format.DateTimeParseException;
-import java.util.Objects;
-
-/**
- * Utility class to find root cause exceptions.
- */
-public class RootCauseFinder {
-
-    private RootCauseFinder() {
-    }
-
-    public static Throwable findCauseUsingPlainJava(Throwable throwable) {
-        Objects.requireNonNull(throwable);
-        Throwable rootCause = throwable;
-        while (rootCause.getCause() != null && rootCause.getCause() != rootCause) {
-            rootCause = rootCause.getCause();
-        }
-        return rootCause;
-    }
-
-    /**
-     *  Calculates the age of a person from a given date.
-     */
-    static class AgeCalculator {
-
-        private AgeCalculator() {
-        }
-
-        public static int calculateAge(String birthDate) {
-            if (birthDate == null || birthDate.isEmpty()) {
-                throw new IllegalArgumentException();
-            }
-
-            try {
-                return Period
-                  .between(parseDate(birthDate), LocalDate.now())
-                  .getYears();
-            } catch (DateParseException ex) {
-                throw new CalculationException(ex);
-            }
-        }
-
-        private static LocalDate parseDate(String birthDateAsString) {
-
-            LocalDate birthDate;
-            try {
-                birthDate = LocalDate.parse(birthDateAsString);
-            } catch (DateTimeParseException ex) {
-                throw new InvalidFormatException(birthDateAsString, ex);
-            }
-
-            if (birthDate.isAfter(LocalDate.now())) {
-                throw new DateOutOfRangeException(birthDateAsString);
-            }
-
-            return birthDate;
-        }
-
-    }
-
-    static class CalculationException extends RuntimeException {
-
-        CalculationException(DateParseException ex) {
-            super(ex);
-        }
-    }
-
-    static class DateParseException extends RuntimeException {
-
-        DateParseException(String input) {
-            super(input);
-        }
-
-        DateParseException(String input, Throwable thr) {
-            super(input, thr);
-        }
-    }
-
-    static class InvalidFormatException extends DateParseException {
-
-        InvalidFormatException(String input, Throwable thr) {
-            super("Invalid date format: " + input, thr);
-        }
-    }
-
-    static class DateOutOfRangeException extends DateParseException {
-
-        DateOutOfRangeException(String date) {
-            super("Date out of range: " + date);
-        }
-
-    }
-
-}