feat: TemperaturesService

readme.md

@@ -36,3 +36,8 @@ Write an application that, at the endpoint specified by you, returns the yearly
   }
 ]
 ```
+
+## Usage
+
+Temperature statistics endpoint: `/api/temperatures/{city}`
+Returns HTTP 200 when city is found, 404 otherwise.

src/main/java/eu/ztsh/lfr/core/TemperaturesService.java

@@ -0,0 +1,13 @@
+package eu.ztsh.lfr.core;
+
+import eu.ztsh.lfr.model.Entry;
+import jakarta.annotation.Nonnull;
+
+import java.util.List;
+
+public interface TemperaturesService {
+
+    @Nonnull
+    List<Entry> getTemperaturesFor(String city);
+
+}

src/main/java/eu/ztsh/lfr/core/impl/TemperaturesServiceImpl.java

@@ -0,0 +1,19 @@
+package eu.ztsh.lfr.core.impl;
+
+import eu.ztsh.lfr.core.TemperaturesService;
+import eu.ztsh.lfr.model.Entry;
+import jakarta.annotation.Nonnull;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class TemperaturesServiceImpl implements TemperaturesService {
+
+    @Nonnull
+    @Override
+    public List<Entry> getTemperaturesFor(String city) {
+        throw new UnsupportedOperationException("Not supported yet.");
+    }
+
+}

src/main/java/eu/ztsh/lfr/web/TemperaturesController.java

@@ -0,0 +1,32 @@
+package eu.ztsh.lfr.web;
+
+import eu.ztsh.lfr.core.TemperaturesService;
+import eu.ztsh.lfr.model.Entry;
+import org.springframework.beans.factory.annotation.Autowired;
+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;
+
+@RestController
+@RequestMapping("/api/temperatures")
+public class TemperaturesController {
+
+    private final TemperaturesService temperaturesService;
+
+    @Autowired
+    public TemperaturesController(TemperaturesService temperaturesService) {
+        this.temperaturesService = temperaturesService;
+    }
+
+    @GetMapping("/{city}")
+    public ResponseEntity<List<Entry>> getTemperatures(@PathVariable String city) {
+        var data = temperaturesService.getTemperaturesFor(city);
+
+        return data.isEmpty() ? ResponseEntity.notFound().build() : ResponseEntity.ok(data);
+    }
+
+}