first barebones project structure

pom.xml

@@ -31,24 +31,42 @@
 		<java.version>25</java.version>
 	</properties>
 	<dependencies>
-<!--		<dependency>-->
-<!--			<groupId>org.springframework.boot</groupId>-->
-<!--			<artifactId>spring-boot-starter-data-jdbc</artifactId>-->
-<!--		</dependency>-->
-<!--		<dependency>-->
-<!--			<groupId>org.springframework.boot</groupId>-->
-<!--			<artifactId>spring-boot-starter-data-jpa</artifactId>-->
-<!--		</dependency>-->
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-websocket</artifactId>
 		</dependency>
-
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-test</artifactId>
 			<scope>test</scope>
 		</dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <scope>annotationProcessor</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+<!--        <dependency>-->
+<!--            <groupId>org.springframework.boot</groupId>-->
+<!--            <artifactId>spring-boot-starter-security</artifactId>-->
+<!--        </dependency>-->
+        <dependency>
+            <groupId>org.springframework.security</groupId>
+            <artifactId>spring-security-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-actuator</artifactId>
+        </dependency>
     </dependencies>
 
 	<build>

src/main/java/de/pnreichmuth/timekeep_backend/TimekeepBackendApplication.java

@@ -2,8 +2,6 @@ package de.pnreichmuth.timekeep_backend;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.RestController;
 
 @SpringBootApplication
 public class TimekeepBackendApplication {

src/main/java/de/pnreichmuth/timekeep_backend/TimekeepBackendSecurityConfig.java

@@ -0,0 +1,21 @@
+package de.pnreichmuth.timekeep_backend;
+
+//import org.springframework.context.annotation.Bean;
+//import org.springframework.context.annotation.Configuration;
+//import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+//import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
+//import org.springframework.security.web.SecurityFilterChain;
+//
+//
+//@Configuration
+////@EnableWebSecurity
+//public class TimekeepBackendSecurityConfig {
+//    @Bean
+//    public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
+//        http.authorizeHttpRequests((authorize) ->
+//                authorize.
+//                        anyRequest().authenticated());
+//        return http.build();
+//    }
+//
+//}

src/main/java/de/pnreichmuth/timekeep_backend/TimekeepRestController.java

@@ -1,23 +0,0 @@
-package de.pnreichmuth.timekeep_backend;
-
-import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.RestController;
-
-import java.util.Date;
-
-@RestController
-public class TimekeepRestController {
-
-    public TimekeepRestController() {
-
-    }
-
-    @GetMapping("/time/test")
-    public Testclass timeEndpoint(){
-        return new Testclass("TEST",1);
-    }
-    @GetMapping("/time")
-    public Date getTime(){
-        return new Date();
-    }
-}

src/main/java/de/pnreichmuth/timekeep_backend/controllers/TeamRestController.java

@@ -0,0 +1,34 @@
+package de.pnreichmuth.timekeep_backend.controllers;
+
+import de.pnreichmuth.timekeep_backend.entities.Team;
+import de.pnreichmuth.timekeep_backend.repositories.TeamRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/teams")
+public class TeamRestController {
+    @Autowired
+    private TeamRepository teamRepository;
+
+    @PostMapping("createTeam")
+    public Team createTeam(){
+        Team team = new Team();
+        teamRepository.save(team);
+        return team;
+    }
+
+    @GetMapping("all")
+    public List<Team> findAllTeams(){
+        return teamRepository.findAll();
+    }
+
+    @DeleteMapping("all")
+    public void deleteAllTeams(){
+        teamRepository.deleteAll();
+    }
+
+}
+

src/main/java/de/pnreichmuth/timekeep_backend/entities/Racer.java

@@ -0,0 +1,20 @@
+package de.pnreichmuth.timekeep_backend.entities;
+
+import jakarta.persistence.*;
+import lombok.*;
+
+import java.util.UUID;
+
+@Entity
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class Racer{
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private UUID id;
+
+    private String name;
+    private Boolean isFirstSemester;
+    private String phoneNumber;
+}

src/main/java/de/pnreichmuth/timekeep_backend/entities/Station.java

@@ -0,0 +1,22 @@
+package de.pnreichmuth.timekeep_backend.entities;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import lombok.Getter;
+
+import java.util.UUID;
+
+@Entity
+@Getter
+
+public class Station {
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private UUID id;
+
+    private String name;
+    private String location;
+    private String passwordHash;
+}

src/main/java/de/pnreichmuth/timekeep_backend/entities/Team.java

@@ -0,0 +1,71 @@
+package de.pnreichmuth.timekeep_backend.entities;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.stream.Stream;
+
+@Entity
+@Getter
+public class Team  {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private UUID id;
+
+    @Setter
+    private String teamName;
+
+    private boolean firstSemesterTeam;
+
+    @OneToMany(cascade = CascadeType.ALL)
+    private Map<String, Racer> members;
+
+    @OneToMany(cascade = CascadeType.ALL)
+    private Map<String, Station> passedStations;
+
+    public Team(){
+        this.teamName = "Team-" + UUID.randomUUID();
+        this.firstSemesterTeam = true;
+        this.members = new HashMap<>(4);
+        this.passedStations = new HashMap<>();
+    }
+
+
+
+    /**
+    * Treat this team as a team of first semester students, if at least 50% of its members are in the first semester
+     */
+    private void checkFirstSemesterTeam(){
+        long erstiCount = members.entrySet().stream()
+                .filter(
+                        e -> e.getValue().getIsFirstSemester()
+                ).count();
+        double percentFirstSemester = erstiCount /(double)members.size();
+        this.firstSemesterTeam = percentFirstSemester >= 0.5;
+    }
+
+    /**
+     * Adds a new member to the team and checks whether the team still qualifies as a first semester team
+     * @param newMember the Racer object to be added to the team
+     */
+    public void addMember(Racer newMember){
+        this.members.put(newMember.getName(), newMember);
+        this.checkFirstSemesterTeam();
+    }
+
+    /**
+     * Removes a member from the team by name
+     * @param name the name of the member to be removed
+     */
+    public void removeMember(String name){
+        this.members.remove(name);
+        this.checkFirstSemesterTeam();
+    }
+}

src/main/java/de/pnreichmuth/timekeep_backend/repositories/RacerRepository.java

@@ -0,0 +1,14 @@
+package de.pnreichmuth.timekeep_backend.repositories;
+
+import de.pnreichmuth.timekeep_backend.entities.Racer;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+import java.util.UUID;
+
+@Repository
+public interface RacerRepository extends JpaRepository<Racer, UUID> {
+    Racer findByName(String name);
+    List<Racer> findAllByName(String name);
+}

src/main/java/de/pnreichmuth/timekeep_backend/repositories/StationRepository.java

@@ -0,0 +1,14 @@
+package de.pnreichmuth.timekeep_backend.repositories;
+
+import de.pnreichmuth.timekeep_backend.entities.Station;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.UUID;
+
+@Repository
+public interface StationRepository extends JpaRepository<Station, UUID> {
+    public Station findByLocation(String location);
+    public Station findByName(String name);
+    public Station findByPasswordHash(String passwordHash);
+}

src/main/java/de/pnreichmuth/timekeep_backend/repositories/TeamRepository.java

@@ -0,0 +1,17 @@
+package de.pnreichmuth.timekeep_backend.repositories;
+
+import de.pnreichmuth.timekeep_backend.entities.Station;
+import de.pnreichmuth.timekeep_backend.entities.Team;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+import java.util.UUID;
+
+@Repository
+public interface TeamRepository extends JpaRepository<Team, UUID> {
+    Team getTeamById(UUID id);
+    Team getTeamByTeamName(String name);
+    List<Team> getTeamsByFirstSemesterTeamIsTrue();
+    List<Team> getTeamsByPassedStationsContains(Station station);
+}

src/main/resources/application.properties

@@ -1 +1,7 @@
 spring.application.name=timekeep-backend
+spring.jpa.hibernate.ddl-auto=update
+spring.datasource.url=jdbc:mysql://localhost:3306/jpa
+spring.datasource.username=myuser
+spring.datasource.password=secret
+spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
+spring.jpa.show-sql= true

src/main/resources/compose.yaml

@@ -0,0 +1,11 @@
+services:
+  mysql:
+    container_name: 'jpa-mysql'
+    image: 'mysql:latest'
+    environment:
+      - 'MYSQL_DATABASE=jpa'
+      - 'MYSQL_PASSWORD=secret'
+      - 'MYSQL_ROOT_PASSWORD=verysecret'
+      - 'MYSQL_USER=myuser'
+    ports:
+      - '3306:3306'