multiple debitors and subsequent memberships

src/main/resources/db/changelog/5-hs-office/510-membership/5100-hs-office-membership.sql

@@ -32,6 +32,36 @@ create table if not exists hs_office.membership
 --//
 
 
+-- ============================================================================
+--changeset michael.hoennig:hs-office-membership-SINGLE-MEMBERSHIP-CHECK endDelimiter:--//
+-- ----------------------------------------------------------------------------
+
+CREATE OR REPLACE FUNCTION hs_office.validate_membership_validity()
+    RETURNS trigger AS $$
+BEGIN
+    IF EXISTS (
+        SELECT 1
+            FROM hs_office.membership
+            WHERE partnerUuid = NEW.partnerUuid
+              AND uuid <> NEW.uuid
+              AND NEW.validity && validity
+    ) THEN
+        RAISE EXCEPTION 'Membership validity ranges overlap for partnerUuid %', NEW.partnerUuid;
+    END IF;
+
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER trg_validate_membership_validity
+    BEFORE INSERT OR UPDATE ON hs_office.membership
+    FOR EACH ROW
+EXECUTE FUNCTION hs_office.validate_membership_validity();
+
+
+--//
+
+
 -- ============================================================================
 --changeset michael.hoennig:hs-office-membership-MAIN-TABLE-JOURNAL endDelimiter:--//
 -- ----------------------------------------------------------------------------

src/main/resources/db/changelog/5-hs-office/510-membership/5108-hs-office-membership-test-data.sql

@@ -10,7 +10,8 @@
  */
 create or replace procedure hs_office.membership_create_test_data(
         forPartnerNumber numeric(5),
-        newMemberNumberSuffix char(2) )
+        newMemberNumberSuffix char(2),
+        validity daterange)
     language plpgsql as $$
 declare
     relatedPartner          hs_office.partner;
@@ -22,7 +23,7 @@ begin
     raise notice '- using partner (%): %', relatedPartner.uuid, relatedPartner;
     insert
         into hs_office.membership (uuid, partneruuid, memberNumberSuffix, validity, status)
-        values (uuid_generate_v4(), relatedPartner.uuid, newMemberNumberSuffix, daterange('20221001' , null, '[]'), 'ACTIVE');
+        values (uuid_generate_v4(), relatedPartner.uuid, newMemberNumberSuffix, validity, 'ACTIVE');
 end; $$;
 --//
 
@@ -35,9 +36,9 @@ do language plpgsql $$
     begin
         call base.defineContext('creating Membership test-data', null, 'superuser-alex@hostsharing.net', 'rbac.global#global:ADMIN');
 
-        call hs_office.membership_create_test_data(10001, '01');
+        call hs_office.membership_create_test_data(10001, '01', daterange('20221001' , '20241231', '[)'));
-        call hs_office.membership_create_test_data(10002, '02');
+        call hs_office.membership_create_test_data(10002, '02', daterange('20221001' , '20251231', '[]'));
-        call hs_office.membership_create_test_data(10003, '03');
+        call hs_office.membership_create_test_data(10003, '03', daterange('20221001' , null, '[]'));
     end;
 $$;
 --//

src/test/java/net/hostsharing/hsadminng/hs/office/membership/HsOfficeMembershipControllerAcceptanceTest.java

@@ -86,7 +86,7 @@ class HsOfficeMembershipControllerAcceptanceTest extends ContextBasedTestWithCle
                               "memberNumber": "M-1000101",
                               "memberNumberSuffix": "01",
                               "validFrom": "2022-10-01",
-                              "validTo": null,
+                              "validTo": "2024-12-30",
                               "status": "ACTIVE"
                           },
                           {
@@ -94,7 +94,7 @@ class HsOfficeMembershipControllerAcceptanceTest extends ContextBasedTestWithCle
                               "memberNumber": "M-1000202",
                               "memberNumberSuffix": "02",
                               "validFrom": "2022-10-01",
-                              "validTo": null,
+                              "validTo": "2025-12-31",
                               "status": "ACTIVE"
                           },
                           {
@@ -133,7 +133,7 @@ class HsOfficeMembershipControllerAcceptanceTest extends ContextBasedTestWithCle
                               "memberNumber": "M-1000101",
                               "memberNumberSuffix": "01",
                               "validFrom": "2022-10-01",
-                              "validTo": null,
+                              "validTo": "2024-12-30",
                               "status": "ACTIVE"
                           }
                       ]
@@ -161,7 +161,7 @@ class HsOfficeMembershipControllerAcceptanceTest extends ContextBasedTestWithCle
                                   "memberNumber": "M-1000202",
                                   "memberNumberSuffix": "02",
                                   "validFrom": "2022-10-01",
-                                  "validTo": null,
+                                  "validTo": "2025-12-31",
                                   "status": "ACTIVE"
                               }
                           ]
@@ -177,7 +177,7 @@ class HsOfficeMembershipControllerAcceptanceTest extends ContextBasedTestWithCle
         void globalAdmin_canAddMembership() {
 
             context.define("superuser-alex@hostsharing.net");
-            final var givenPartner = partnerRepo.findPartnerByOptionalNameLike("Third").get(0);
+            final var givenPartner = partnerRepo.findPartnerByOptionalNameLike("First").getFirst();
             final var givenMemberSuffix = TEMP_MEMBER_NUMBER_SUFFIX;
             final var expectedMemberNumber = Integer.parseInt(givenPartner.getPartnerNumber() + TEMP_MEMBER_NUMBER_SUFFIX);
 
@@ -189,7 +189,7 @@ class HsOfficeMembershipControllerAcceptanceTest extends ContextBasedTestWithCle
                                {
                                    "partner.uuid": "%s",
                                    "memberNumberSuffix": "%s",
-                                   "validFrom": "2022-10-13",
+                                   "validFrom": "2025-02-13",
                                    "membershipFeeBillable": "true"
                                  }
                             """.formatted(givenPartner.getUuid(), givenMemberSuffix))
@@ -200,10 +200,10 @@ class HsOfficeMembershipControllerAcceptanceTest extends ContextBasedTestWithCle
                         .statusCode(201)
                         .contentType(ContentType.JSON)
                         .body("uuid", isUuidValid())
-                        .body("partner.partnerNumber", is("P-10003"))
+                        .body("partner.partnerNumber", is("P-10001"))
                         .body("memberNumber", is("M-" + expectedMemberNumber))
                         .body("memberNumberSuffix", is(givenMemberSuffix))
-                        .body("validFrom", is("2022-10-13"))
+                        .body("validFrom", is("2025-02-13"))
                         .body("validTo", equalTo(null))
                         .header("Location", startsWith("http://localhost"))
                     .extract().header("Location");  // @formatter:on
@@ -239,7 +239,7 @@ class HsOfficeMembershipControllerAcceptanceTest extends ContextBasedTestWithCle
                          "memberNumber": "M-1000101",
                          "memberNumberSuffix": "01",
                          "validFrom": "2022-10-01",
-                         "validTo": null,
+                         "validTo": "2024-12-30",
                          "status": "ACTIVE"
                      }
                     """)); // @formatter:on
@@ -297,13 +297,13 @@ class HsOfficeMembershipControllerAcceptanceTest extends ContextBasedTestWithCle
             context.define("superuser-alex@hostsharing.net");
             final var givenMembership = givenSomeTemporaryMembershipBessler("First");
 
-            final var location = RestAssured // @formatter:off
+            RestAssured // @formatter:off
                 .given()
                     .header("current-subject", "superuser-alex@hostsharing.net")
                     .contentType(ContentType.JSON)
                     .body("""
                            {
-                               "validTo": "2023-12-31",
+                               "validTo": "2025-12-31",
                                "status": "CANCELLED"
                            }
                           """)
@@ -316,8 +316,8 @@ class HsOfficeMembershipControllerAcceptanceTest extends ContextBasedTestWithCle
                     .body("uuid", isUuidValid())
                     .body("partner.partnerNumber", is("P-" + givenMembership.getPartner().getPartnerNumber()))
                     .body("memberNumberSuffix", is(givenMembership.getMemberNumberSuffix()))
-                    .body("validFrom", is("2022-11-01"))
+                    .body("validFrom", is("2025-02-01"))
-                    .body("validTo", is("2023-12-31"))
+                    .body("validTo", is("2025-12-31"))
                     .body("status", is("CANCELLED"));
             // @formatter:on
 
@@ -326,7 +326,7 @@ class HsOfficeMembershipControllerAcceptanceTest extends ContextBasedTestWithCle
                     .matches(mandate -> {
                         assertThat(mandate.getPartner().toShortString()).isEqualTo("P-10001");
                         assertThat(mandate.getMemberNumberSuffix()).isEqualTo(givenMembership.getMemberNumberSuffix());
-                        assertThat(mandate.getValidity().asString()).isEqualTo("[2022-11-01,2024-01-01)");
+                        assertThat(mandate.getValidity().asString()).isEqualTo("[2022-11-01,2026-01-01)");
                         assertThat(mandate.getStatus()).isEqualTo(CANCELLED);
                         return true;
                     });
@@ -348,7 +348,7 @@ class HsOfficeMembershipControllerAcceptanceTest extends ContextBasedTestWithCle
                     .contentType(ContentType.JSON)
                     .body("""
                            {
-                               "validTo": "2024-01-01",
+                               "validTo": "2025-12-31",
                                "status": "CANCELLED"
                            }
                            """)
@@ -361,7 +361,7 @@ class HsOfficeMembershipControllerAcceptanceTest extends ContextBasedTestWithCle
             // finally, the Membership is actually updated
             assertThat(membershipRepo.findByUuid(givenMembership.getUuid())).isPresent().get()
                     .matches(mandate -> {
-                        assertThat(mandate.getValidity().asString()).isEqualTo("[2022-11-01,2024-01-02)");
+                        assertThat(mandate.getValidity().asString()).isEqualTo("[2025-02-01,2026-01-01)");
                         assertThat(mandate.getStatus()).isEqualTo(CANCELLED);
                         return true;
                     });
@@ -434,7 +434,7 @@ class HsOfficeMembershipControllerAcceptanceTest extends ContextBasedTestWithCle
             final var newMembership = HsOfficeMembershipEntity.builder()
                     .partner(givenPartner)
                     .memberNumberSuffix(TEMP_MEMBER_NUMBER_SUFFIX)
-                    .validity(Range.closedInfinite(LocalDate.parse("2022-11-01")))
+                    .validity(Range.closedInfinite(LocalDate.parse("2025-02-01")))
                     .status(ACTIVE)
                     .membershipFeeBillable(true)
                     .build();

src/test/java/net/hostsharing/hsadminng/hs/office/membership/HsOfficeMembershipRepositoryIntegrationTest.java

@@ -12,6 +12,7 @@ import net.hostsharing.hsadminng.rbac.test.JpaAttempt;
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
+import org.postgresql.util.PSQLException;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
 import org.springframework.test.context.bean.override.mockito.MockitoBean;
@@ -74,7 +75,7 @@ class HsOfficeMembershipRepositoryIntegrationTest extends ContextBasedTestWithCl
                 final var newMembership = HsOfficeMembershipEntity.builder()
                         .memberNumberSuffix("11")
                         .partner(givenPartner)
-                        .validity(Range.closedInfinite(LocalDate.parse("2020-01-01")))
+                        .validity(Range.closedInfinite(LocalDate.parse("2025-01-01")))
                         .membershipFeeBillable(true)
                         .build();
                 return toCleanup(membershipRepo.save(newMembership).load());
@@ -87,6 +88,28 @@ class HsOfficeMembershipRepositoryIntegrationTest extends ContextBasedTestWithCl
             assertThat(membershipRepo.count()).isEqualTo(count + 1);
         }
 
+        @Test
+        public void creatingMembershipForSamePartnerIsDisallowedIfAnotherOneIsStillActive() {
+            // given
+            context("superuser-alex@hostsharing.net");
+            final var count = membershipRepo.count();
+            final var givenPartner = partnerRepo.findPartnerByOptionalNameLike("First").getFirst();
+
+            // when
+            final var result = attempt(em, () -> {
+                final var newMembership = HsOfficeMembershipEntity.builder()
+                        .memberNumberSuffix("11")
+                        .partner(givenPartner)
+                        .validity(Range.closedInfinite(LocalDate.parse("2024-01-01")))
+                        .membershipFeeBillable(true)
+                        .build();
+                return toCleanup(membershipRepo.save(newMembership).load());
+            });
+
+            // then
+            result.assertExceptionWithRootCauseMessage(PSQLException.class, "Membership validity ranges overlap for partnerUuid " + givenPartner.getUuid());
+        }
+
         @Test
         public void createsAndGrantsRoles() {
             // given
@@ -102,7 +125,7 @@ class HsOfficeMembershipRepositoryIntegrationTest extends ContextBasedTestWithCl
                 final var newMembership = HsOfficeMembershipEntity.builder()
                         .memberNumberSuffix("17")
                         .partner(givenPartner)
-                        .validity(Range.closedInfinite(LocalDate.parse("2020-01-01")))
+                        .validity(Range.closedInfinite(LocalDate.parse("2025-01-01")))
                         .membershipFeeBillable(true)
                         .build();
                 return toCleanup(membershipRepo.save(newMembership));
@@ -163,8 +186,8 @@ class HsOfficeMembershipRepositoryIntegrationTest extends ContextBasedTestWithCl
             // then
             exactlyTheseMembershipsAreReturned(
                     result,
-                    "Membership(M-1000101, P-10001, [2022-10-01,), ACTIVE)",
+                    "Membership(M-1000101, P-10001, [2022-10-01,2024-12-31), ACTIVE)",
-                    "Membership(M-1000202, P-10002, [2022-10-01,), ACTIVE)",
+                    "Membership(M-1000202, P-10002, [2022-10-01,2026-01-01), ACTIVE)",
                     "Membership(M-1000303, P-10003, [2022-10-01,), ACTIVE)");
         }
 
@@ -179,7 +202,7 @@ class HsOfficeMembershipRepositoryIntegrationTest extends ContextBasedTestWithCl
 
             // then
             exactlyTheseMembershipsAreReturned(result,
-                    "Membership(M-1000101, P-10001, [2022-10-01,), ACTIVE)");
+                    "Membership(M-1000101, P-10001, [2022-10-01,2024-12-31), ACTIVE)");
         }
 
         @Test
@@ -194,7 +217,7 @@ class HsOfficeMembershipRepositoryIntegrationTest extends ContextBasedTestWithCl
             assertThat(result)
                     .isNotNull()
                     .extracting(Object::toString)
-                    .isEqualTo("Membership(M-1000202, P-10002, [2022-10-01,), ACTIVE)");
+                    .isEqualTo("Membership(M-1000202, P-10002, [2022-10-01,2026-01-01), ACTIVE)");
         }
 
         @Test
@@ -209,7 +232,7 @@ class HsOfficeMembershipRepositoryIntegrationTest extends ContextBasedTestWithCl
             assertThat(result)
                     .isNotNull()
                     .extracting(Object::toString)
-                    .isEqualTo("Membership(M-1000202, P-10002, [2022-10-01,), ACTIVE)");
+                    .isEqualTo("Membership(M-1000202, P-10002, [2022-10-01,2026-01-01), ACTIVE)");
         }
 
         @Test
@@ -222,7 +245,7 @@ class HsOfficeMembershipRepositoryIntegrationTest extends ContextBasedTestWithCl
 
             // then
             exactlyTheseMembershipsAreReturned(result,
-                    "Membership(M-1000202, P-10002, [2022-10-01,), ACTIVE)");
+                    "Membership(M-1000202, P-10002, [2022-10-01,2026-01-01), ACTIVE)");
         }
     }
 
@@ -388,7 +411,7 @@ class HsOfficeMembershipRepositoryIntegrationTest extends ContextBasedTestWithCl
             final var newMembership = HsOfficeMembershipEntity.builder()
                     .memberNumberSuffix(memberNumberSuffix)
                     .partner(givenPartner)
-                    .validity(Range.closedInfinite(LocalDate.parse("2020-01-01")))
+                    .validity(Range.closedInfinite(LocalDate.parse("2025-02-01")))
                     .membershipFeeBillable(true)
                     .build();
 

src/test/java/net/hostsharing/hsadminng/hs/office/scenarios/HsOfficeScenarioTests.java

@@ -287,12 +287,12 @@ class HsOfficeScenarioTests extends ScenarioTest {
 
         @Test
         @Order(2011)
-        @Requires("Person: Test AG")
+        @Requires("Debitor: D-3101000 - Test AG - main debitor")
-        @Produces("Debitor: D-3101001 - Test AG - main debitor")
+        @Produces("Debitor: D-3101001 - Test AG - additional debitor")
-        void shouldCreateExternalDebitorForPartner() {
+        void shouldCreateAdditionDebitorForPartner() {
-            new CreateExternalDebitorForPartner(scenarioTest)
+            new CreateSelfDebitorForPartner(scenarioTest)
                     .given("partnerPersonTradeName", "Test AG")
-                    .given("billingContactCaption", "Billing GmbH - billing department")
+                    .given("billingContactCaption", "Test AG - billing department")
                     .given("billingContactEmailAddress", "billing@test-ag.example.org")
                     .given("debitorNumberSuffix", "01")
                     .given("billable", true)
@@ -305,10 +305,30 @@ class HsOfficeScenarioTests extends ScenarioTest {
                     .keep();
         }
 
+        @Test
+        @Order(2012)
+        @Requires("Person: Test AG")
+        @Produces("Debitor: D-3101002 - Test AG - external debitor")
+        void shouldCreateExternalDebitorForPartner() {
+            new CreateExternalDebitorForPartner(scenarioTest)
+                    .given("partnerPersonTradeName", "Test AG")
+                    .given("billingContactCaption", "Billing GmbH - billing department")
+                    .given("billingContactEmailAddress", "billing@test-ag.example.org")
+                    .given("debitorNumberSuffix", "02")
+                    .given("billable", true)
+                    .given("vatId", "VAT123456")
+                    .given("vatCountryCode", "DE")
+                    .given("vatBusiness", true)
+                    .given("vatReverseCharge", false)
+                    .given("defaultPrefix", "tsy")
+                    .doRun()
+                    .keep();
+        }
+
         @Test
         @Order(2020)
         @Requires("Person: Test AG")
-        @Produces(explicitly = "Debitor: D-3101000 - Test AG - delete debitor", permanent = false)
+        @Produces(explicitly = "Debitor: D-3101002 - Test AG - delete debitor", permanent = false)
         void shouldDeleteDebitor() {
             new DeleteDebitor(scenarioTest)
                     .given("partnerNumber", "P-31020")
@@ -317,7 +337,7 @@ class HsOfficeScenarioTests extends ScenarioTest {
         }
 
         @Test
-        @Order(2020)
+        @Order(2021)
         @Requires("Debitor: D-3101000 - Test AG - main debitor")
         @Disabled("see TODO.spec in DontDeleteDefaultDebitor")
         void shouldNotDeleteDefaultDebitor() {
@@ -387,7 +407,7 @@ class HsOfficeScenarioTests extends ScenarioTest {
         void shouldCreateMembershipForPartner() {
             new CreateMembership(scenarioTest)
                     .given("partnerName", "Test AG")
-                    .given("validFrom", "2024-10-15")
+                    .given("validFrom", "2020-10-15")
                     .given("newStatus", "ACTIVE")
                     .given("membershipFeeBillable", "true")
                     .doRun()
@@ -395,14 +415,31 @@ class HsOfficeScenarioTests extends ScenarioTest {
         }
 
         @Test
-        @Order(4090)
+        @Order(4080)
         @Requires("Membership: M-3101000 - Test AG")
+        @Produces("Membership: M-3101000 - Test AG - cancelled")
         void shouldCancelMembershipOfPartner() {
             new CancelMembership(scenarioTest)
                     .given("memberNumber", "M-3101000")
-                    .given("validTo", "2025-12-30")
+                    .given("validTo", "2023-12-31")
                     .given("newStatus", "CANCELLED")
-                    .doRun();
+                    .doRun()
+                    .keep();
+        }
+
+        @Test
+        @Order(4090)
+        @Requires("Membership: M-3101000 - Test AG - cancelled")
+        @Produces("Membership: M-3101001 - Test AG")
+        void shouldCreateSubsequentMembershipOfPartner() {
+            new CreateMembership(scenarioTest)
+                    .given("partnerName", "Test AG")
+                    .given("memberNumberSuffix", "01")
+                    .given("validFrom", "2025-02-24")
+                    .given("newStatus", "ACTIVE")
+                    .given("membershipFeeBillable", "true")
+                    .doRun()
+                    .keep();
         }
     }
 

src/test/java/net/hostsharing/hsadminng/hs/office/scenarios/debitor/DeleteDebitor.java

@@ -19,7 +19,7 @@ public class DeleteDebitor extends UseCase<DeleteDebitor> {
                 .given("vatCountryCode", "DE")
                 .given("vatBusiness", true)
                 .given("vatReverseCharge", false)
-                .given("defaultPrefix", "tsy"));
+                .given("defaultPrefix", "tsz"));
     }
 
     @Override

src/test/java/net/hostsharing/hsadminng/rbac/test/JpaAttempt.java

@@ -1,6 +1,6 @@
 package net.hostsharing.hsadminng.rbac.test;
 
-import org.assertj.core.api.ObjectAssert;
+import lombok.SneakyThrows;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.core.NestedExceptionUtils;
 import org.springframework.stereotype.Service;
@@ -78,9 +78,9 @@ public class JpaAttempt {
     public static class JpaResult<T> {
 
         private final T value;
-        private final RuntimeException exception;
+        private final Throwable exception;
 
-        private JpaResult(final T value, final RuntimeException exception) {
+        private JpaResult(final T value, final Throwable exception) {
             this.value = value;
             this.exception = exception;
         }
@@ -93,7 +93,7 @@ public class JpaAttempt {
             return new JpaResult<>(value, null);
         }
 
-        public static <T> JpaResult<T> forException(final RuntimeException exception) {
+        public static <T> JpaResult<T> forException(final Throwable exception) {
             return new JpaResult<>(null, exception);
         }
 
@@ -105,20 +105,23 @@ public class JpaAttempt {
             return value;
         }
 
-        public ObjectAssert<T> assertThatResult() {
+        public Throwable caughtException() {
-            assertSuccessful();
-            return assertThat(returnedValue());
-        }
-
-        public RuntimeException caughtException() {
             return exception;
         }
 
-        @SuppressWarnings("unchecked")
+        public <E extends Throwable> E caughtException(final Class<E> expectedExceptionClass) {
-        public <E extends RuntimeException> E caughtException(final Class<E> expectedExceptionClass) {
+            //noinspection unchecked
+            return caughtException((E) exception, expectedExceptionClass);
+        }
+
+        public static <E extends Throwable> E caughtException(final Throwable exception, final Class<E> expectedExceptionClass) {
             if (expectedExceptionClass.isAssignableFrom(exception.getClass())) {
+                //noinspection unchecked
                 return (E) exception;
             }
+            if(exception.getCause() != null && exception.getCause() != exception ) {
+                return caughtException(exception.getCause(), expectedExceptionClass);
+            }
             throw new AssertionError("expected " + expectedExceptionClass + " but got " + exception);
         }
 
@@ -127,7 +130,7 @@ public class JpaAttempt {
         }
 
         public void assertExceptionWithRootCauseMessage(
-                final Class<? extends RuntimeException> expectedExceptionClass,
+                final Class<? extends Throwable> expectedExceptionClass,
                 final String... expectedRootCauseMessages) {
             assertThat(wasSuccessful()).as("wasSuccessful").isFalse();
             final String firstRootCauseMessageLine = firstRootCauseMessageLineOf(caughtException(expectedExceptionClass));
@@ -136,11 +139,11 @@ public class JpaAttempt {
             }
         }
 
-        public JpaResult<T> reThrowException() {
+        @SneakyThrows
+        public void reThrowException() {
             if (exception != null) {
                 throw exception;
             }
-            return this;
         }
 
         public JpaResult<T> assumeSuccessful() {
@@ -158,9 +161,9 @@ public class JpaAttempt {
             return this;
         }
 
-        private String firstRootCauseMessageLineOf(final RuntimeException exception) {
+        private String firstRootCauseMessageLineOf(final Throwable exception) {
             final var rootCause = NestedExceptionUtils.getRootCause(exception);
-            return Optional.ofNullable(rootCause)
+            return Optional.ofNullable(rootCause != null ? rootCause : exception)
                     .map(Throwable::getMessage)
                     .map(message -> message.split("\\r|\\n|\\r\\n", 0)[0])
                     .orElse(null);