services added

src/main/java/com/spacecraft/services/EventService.java

@@ -0,0 +1,34 @@
+package com.spacecraft.services;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.spacecraft.dtos.EventDTO;
+import com.spacecraft.dtos.LongitudeDTO;
+import jakarta.annotation.PostConstruct;
+import lombok.Getter;
+import org.springframework.stereotype.Service;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.List;
+
+@Service
+@Getter
+public class EventService {
+
+    private List<EventDTO> events;
+
+    @PostConstruct
+    public void loadData() throws IOException {
+        ObjectMapper objectMapper = new ObjectMapper();
+        events = objectMapper.readValue(
+                Files.readAllBytes(Paths.get("src/main/java/com/spacecraft/persistence/events.json")),
+                new TypeReference<List<EventDTO>>() {}
+        );
+        for (EventDTO event : events) {
+            System.out.println(event);
+        }
+    }
+
+}

src/main/java/com/spacecraft/services/LatitudeService.java

@@ -0,0 +1,29 @@
+package com.spacecraft.services;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.spacecraft.dtos.LatitudeDTO;
+import jakarta.annotation.PostConstruct;
+import lombok.Getter;
+import org.springframework.stereotype.Service;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.List;
+
+@Service
+@Getter
+public class LatitudeService {
+
+    private List<LatitudeDTO> latitudes;
+
+    @PostConstruct
+    public void loadData() throws IOException{
+        ObjectMapper objectMapper = new ObjectMapper();
+        latitudes = objectMapper.readValue(
+                Files.readAllBytes(Paths.get("src/main/java/com/spacecraft/persistence/latitudes.json")),
+                new TypeReference<List<LatitudeDTO>>() {}
+        );
+    }
+}

src/main/java/com/spacecraft/services/LongitudeService.java

@@ -0,0 +1,32 @@
+package com.spacecraft.services;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.spacecraft.dtos.LongitudeDTO;
+import jakarta.annotation.PostConstruct;
+import lombok.Getter;
+import org.springframework.stereotype.Service;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.List;
+
+@Service
+@Getter
+public class LongitudeService {
+
+    public List<LongitudeDTO> longitudes;
+
+    @PostConstruct
+    public void loadData() throws IOException{
+        ObjectMapper objectMapper = new ObjectMapper();
+        longitudes = objectMapper.readValue(
+                Files.readAllBytes(Paths.get("src/main/java/com/spacecraft/persistence/longitudes.json")),
+                new TypeReference<List<LongitudeDTO>>() {}
+        );
+        for (LongitudeDTO longitudeDTO: longitudes){
+            System.out.println(longitudeDTO);
+        }
+    }
+}

src/main/java/com/spacecraft/services/PositionService.java

@@ -0,0 +1,45 @@
+package com.spacecraft.services;
+
+import com.spacecraft.dtos.LatitudeDTO;
+import com.spacecraft.dtos.LongitudeDTO;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+import java.time.temporal.ChronoUnit;
+import java.util.Comparator;
+
+@Service
+public class PositionService {
+    private DateTimeFormatter formatter = DateTimeFormatter.ISO_DATE_TIME;
+    private final LatitudeService latitudeService;
+    private final LongitudeService longitudeService;
+
+    @Autowired
+    public PositionService(LatitudeService latitudeService,
+                           LongitudeService longitudeService){
+        this.latitudeService = latitudeService;
+        this.longitudeService = longitudeService;
+    }
+
+    public LatitudeDTO getClosestEventLatitude(String eventTime) {
+        LocalDateTime eventDateTime = LocalDateTime.parse(eventTime, formatter);
+
+        return latitudeService.getLatitudes().stream()
+                .min(Comparator.comparing(lat -> Math.abs(ChronoUnit.SECONDS.between(
+                        LocalDateTime.parse(lat.getTimestamp(), formatter),
+                        eventDateTime))))
+                .orElse(null);
+    }
+
+    public LongitudeDTO getClosestEventLongitude(String eventTime){
+        LocalDateTime eventDateTime = LocalDateTime.parse(eventTime, formatter);
+
+        return longitudeService.getLongitudes().stream()
+                .min(Comparator.comparing(lon -> Math.abs(ChronoUnit.SECONDS.between(
+                        LocalDateTime.parse(lon.getTimestamp(), formatter),
+                        eventDateTime))))
+                .orElse(null);
+    }
+}