introduce statistics controller, service and repository

Author: andreasSchoinas

src/main/java/com/getourguide/interview/controller/StatisticsController.java

@@ -0,0 +1,19 @@
+package com.getourguide.interview.controller;
+
+import com.getourguide.interview.service.StatisticsService;
+import java.util.List;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+
+@Controller
+@RequiredArgsConstructor
+public class StatisticsController {
+    private final StatisticsService statisticsService;
+
+    @GetMapping("/stats/suppliers")
+    public ResponseEntity<List<Object[]>> suppliersSearch() {
+        return ResponseEntity.ok(statisticsService.getSupplierStats());
+    }
+}

src/main/java/com/getourguide/interview/repository/StatisticsRepository.java

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+package com.getourguide.interview.repository;
+
+import com.getourguide.interview.entity.Supplier;
+import java.util.List;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface StatisticsRepository extends JpaRepository<Supplier, Long> {
+    String SUPPLIER_STATS_QUERY = """
+        SELECT s.* FROM getyourguide.supplier s
+        """;
+
+    @Query(value = SUPPLIER_STATS_QUERY, nativeQuery = true)
+    List<Object[]> getSupplierStats();
+}

src/main/java/com/getourguide/interview/service/StatisticsService.java

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+package com.getourguide.interview.service;
+
+import com.getourguide.interview.repository.StatisticsRepository;
+import java.util.List;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+public class StatisticsService {
+    private final StatisticsRepository statisticsRepository;
+
+    public List<Object[]> getSupplierStats() {
+        return statisticsRepository.getSupplierStats();
+    }
+}