Merge pull request #98 from UMC-ON/feat/country

Feature: 국가와 도시를 조회할 수 있는 api

src/main/java/com/on/server/domain/country/application/CityService.java

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+package com.on.server.domain.country.application;
+
+import com.on.server.domain.country.domain.City;
+import com.on.server.domain.country.domain.repository.CityRepository;
+import com.on.server.domain.country.dto.CityDTO;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+@Service
+@RequiredArgsConstructor
+public class CityService {
+
+    private final CityRepository cityRepository;
+
+    public List<CityDTO> getCitiesByCountry(String countryName) {
+        List<City> cities = cityRepository.findByCountryName(countryName);
+        return cities.stream()
+                .map(CityDTO::fromEntity)
+                .collect(Collectors.toList());
+    }
+}

src/main/java/com/on/server/domain/country/application/CountryService.java

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+package com.on.server.domain.country.application;
+
+import com.on.server.domain.country.domain.Country;
+import com.on.server.domain.country.domain.repository.CountryRepository;
+import com.on.server.domain.country.dto.CountryDTO;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+@Service
+@RequiredArgsConstructor
+public class CountryService {
+
+    private final CountryRepository countryRepository;
+
+    public List<CountryDTO> getAllCountries() {
+        List<Country> countries = countryRepository.findAll();
+        return countries.stream()
+                .map(CountryDTO::fromEntity)
+                .collect(Collectors.toList());
+    }
+}

src/main/java/com/on/server/domain/country/domain/City.java

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+package com.on.server.domain.country.domain;
+
+import com.on.server.global.domain.BaseEntity;
+import jakarta.persistence.*;
+import lombok.*;
+
+@Getter
+@Builder
+@AllArgsConstructor
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@Entity
+@Table(name = "city")
+public class City extends BaseEntity {
+    @Column(name = "city_code", nullable = false)
+    private String code;
+
+    @Column(name = "city_name", nullable = false)
+    private String name;
+
+    @ManyToOne
+    @JoinColumn(name = "country_id")
+    private Country country;
+}

src/main/java/com/on/server/domain/country/domain/Country.java

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+package com.on.server.domain.country.domain;
+
+import com.on.server.global.domain.BaseEntity;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Table;
+import lombok.*;
+
+@Getter
+@Builder
+@AllArgsConstructor
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@Entity
+@Table(name = "country")
+public class Country  extends BaseEntity {
+
+    @Column(name = "country_code", nullable = false)
+    private String code;
+
+    @Column(name = "country_name", nullable = false)
+    private String name;
+
+    @Column(name = "country_flag", nullable = false)
+    private String flag;
+
+    @Column(name = "continent", nullable = false)
+    private String continent;
+}

src/main/java/com/on/server/domain/country/domain/repository/CityRepository.java

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+package com.on.server.domain.country.domain.repository;
+
+import com.on.server.domain.country.domain.City;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.List;
+
+public interface CityRepository  extends JpaRepository<City, String> {
+    List<City> findByCountryName(String countryName);
+}

src/main/java/com/on/server/domain/country/domain/repository/CountryRepository.java

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+package com.on.server.domain.country.domain.repository;
+
+import com.on.server.domain.country.domain.Country;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface CountryRepository  extends JpaRepository<Country, String> {
+}

src/main/java/com/on/server/domain/country/dto/CityDTO.java

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+package com.on.server.domain.country.dto;
+
+import com.on.server.domain.country.domain.City;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@Builder
+@AllArgsConstructor
+@NoArgsConstructor
+public class CityDTO {
+    private String code;
+    private String name;
+
+    public static CityDTO fromEntity(City city) {
+        return CityDTO.builder()
+                .code(city.getCode())
+                .name(city.getName())
+                .build();
+    }
+}

src/main/java/com/on/server/domain/country/dto/CountryDTO.java

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+package com.on.server.domain.country.dto;
+
+import com.on.server.domain.country.domain.Country;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@Builder
+@AllArgsConstructor
+@NoArgsConstructor
+public class CountryDTO {
+    private String code;
+    private String name;
+    private String flag;
+    private String continent;
+
+    public static CountryDTO fromEntity(Country country) {
+        return CountryDTO.builder()
+                .code(country.getCode())
+                .name(country.getName())
+                .flag(country.getFlag())
+                .continent(country.getContinent())
+                .build();
+    }
+}

src/main/java/com/on/server/domain/country/presentation/CityController.java

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+package com.on.server.domain.country.presentation;
+
+import com.on.server.domain.country.application.CityService;
+import com.on.server.domain.country.dto.CityDTO;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+
+@Tag(name = "도시")
+@RestController
+@RequestMapping("/api/v1/city")
+@RequiredArgsConstructor
+public class CityController {
+
+    private final CityService cityService;
+
+    @Operation(summary = "특정 국가에 대한 도시 목록 조회")
+    @GetMapping("/{countryName}")
+    public ResponseEntity<List<CityDTO>> getCitiesByCountry(@PathVariable("countryName") String countryName) {
+        List<CityDTO> cities = cityService.getCitiesByCountry(countryName);
+        return ResponseEntity.ok(cities);
+    }
+}

src/main/java/com/on/server/domain/country/presentation/CountryController.java

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+package com.on.server.domain.country.presentation;
+
+import com.on.server.domain.country.application.CountryService;
+import com.on.server.domain.country.dto.CountryDTO;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+
+@Tag(name = "국가")
+@RestController
+@RequestMapping("/api/v1/country")
+@RequiredArgsConstructor
+public class CountryController {
+
+    private final CountryService countryService;
+
+    @Operation(summary = "전체 국가 조회")
+    @GetMapping
+    public ResponseEntity<List<CountryDTO>> getAllCountries() {
+        return ResponseEntity.ok(countryService.getAllCountries());
+    }
+}