added DataTransformationService transforming jackson serialized DTOs to flatten Feature objects

src/main/java/click/poweronoff/satellite/repository/dto/Acquisition.java

@@ -1,10 +1,12 @@
 package click.poweronoff.satellite.repository.dto;
 
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import lombok.Builder;
 import lombok.Data;
 
 @JsonIgnoreProperties(ignoreUnknown = true)
 @Data
+@Builder
 public class Acquisition {
 
     private String beginViewingDate;

src/main/java/click/poweronoff/satellite/repository/dto/Features.java

@@ -1,10 +1,14 @@
 package click.poweronoff.satellite.repository.dto;
 
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import lombok.Builder;
 import lombok.Data;
 
 @JsonIgnoreProperties(ignoreUnknown = true)
 @Data
+@Builder
 public class Features {
+    @JsonProperty
     private Properties properties;
 }

src/main/java/click/poweronoff/satellite/repository/dto/FeaturesCollection.java

@@ -1,10 +1,12 @@
 package click.poweronoff.satellite.repository.dto;
 
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import lombok.Builder;
 import lombok.Data;
 
 @JsonIgnoreProperties(ignoreUnknown = true)
 @Data
+@Builder
 public class FeaturesCollection {
     private Features[] features;
 }

src/main/java/click/poweronoff/satellite/repository/dto/Properties.java

@@ -2,10 +2,12 @@ package click.poweronoff.satellite.repository.dto;
 
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import com.fasterxml.jackson.annotation.JsonProperty;
+import lombok.Builder;
 import lombok.Data;
 
 @JsonIgnoreProperties(ignoreUnknown = true)
 @Data
+@Builder
 public class Properties {
 
     @JsonProperty

src/main/java/click/poweronoff/satellite/service/DataServiceImpl.java

@@ -1,6 +1,8 @@
 package click.poweronoff.satellite.service;
 
 import click.poweronoff.satellite.domain.Feature;
+import click.poweronoff.satellite.repository.JsonFileRepository;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
 
 import java.util.List;
@@ -9,6 +11,12 @@ import java.util.Optional;
 @Component
 public class DataServiceImpl implements DataService {
 
+    @Autowired
+    JsonFileRepository jsonFileRepository;
+
+    @Autowired
+    DataTransformationService dataTransformationService;
+
     public Optional<List<Feature>> getAllFeatures() {
         return Optional.empty();
     }

src/main/java/click/poweronoff/satellite/service/DataTransformationService.java

@@ -0,0 +1,35 @@
+package click.poweronoff.satellite.service;
+
+import click.poweronoff.satellite.domain.Feature;
+import click.poweronoff.satellite.repository.dto.Features;
+import click.poweronoff.satellite.repository.dto.FeaturesCollection;
+import org.apache.tomcat.util.codec.binary.Base64;
+import org.springframework.stereotype.Service;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+@Service
+public class DataTransformationService {
+
+    public List<Feature> transformToFeatureList(FeaturesCollection[] collections) {
+
+        List<Feature> featuresList = new ArrayList<>();
+
+        Arrays.stream(collections).forEach(collection -> Arrays.stream(collection.getFeatures()).forEach(feature -> featuresList.add(createFeature(feature))));
+
+        return featuresList;
+    }
+
+    private Feature createFeature(final Features features) {
+        return new Feature(
+                features.getProperties().getId(),
+                Long.parseLong(features.getProperties().getTimestamp()),
+                Long.parseLong(features.getProperties().getAcquisition().getBeginViewingDate()),
+                Long.parseLong(features.getProperties().getAcquisition().getEndViewingDate()),
+                features.getProperties().getAcquisition().getMissionName(),
+                Base64.decodeBase64(features.getProperties().getQuicklook().getBytes())
+        );
+    }
+}

src/test/java/click/poweronoff/satellite/service/DataTransformationServiceTest.java

@@ -0,0 +1,59 @@
+package click.poweronoff.satellite.service;
+
+import click.poweronoff.satellite.domain.Feature;
+import click.poweronoff.satellite.repository.dto.Acquisition;
+import click.poweronoff.satellite.repository.dto.Features;
+import click.poweronoff.satellite.repository.dto.FeaturesCollection;
+import click.poweronoff.satellite.repository.dto.Properties;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.Base64;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class DataTransformationServiceTest {
+
+    private static final String ID = "id";
+    private static final long TIMESTAMP = 271770505L;
+    private static final long BEGIN_VIEWING_DATE = 271770509L;
+    private static final long END_VIEWING_DATE = 271770512L;
+    private static final String MISSION_NAME = "cool-mission";
+    private static final String SATELLITE = "satellite";
+
+
+    DataTransformationService dataTransformationService;
+
+    @Before
+    public void setup() {
+        dataTransformationService = new DataTransformationService();
+    }
+
+
+    @Test
+    public void transformToFeatureListShouldTransformToFeatureList() {
+        List<Feature> objectUnderTest = dataTransformationService.transformToFeatureList(createTestFeaturesCollection());
+        assertThat(objectUnderTest).isNotEmpty();
+        assertThat(objectUnderTest).hasSize(1);
+        assertThat(objectUnderTest).containsOnly(new Feature(ID, TIMESTAMP, BEGIN_VIEWING_DATE, END_VIEWING_DATE, MISSION_NAME, SATELLITE.getBytes()));
+    }
+
+
+    private FeaturesCollection[] createTestFeaturesCollection() {
+
+        Features[] features = new Features[]{Features.builder().properties(Properties.builder()
+                .id(ID)
+                .timestamp(Long.toString(TIMESTAMP))
+                .quicklook(new String(Base64.getEncoder().encode("satellite".getBytes())))
+                .acquisition(Acquisition.builder()
+                        .beginViewingDate(Long.toString(BEGIN_VIEWING_DATE))
+                        .endViewingDate(Long.toString(END_VIEWING_DATE))
+                        .missionName(MISSION_NAME)
+                        .build())
+                .build())
+                .build()};
+
+        return new FeaturesCollection[]{FeaturesCollection.builder().features(features).build()};
+    }
+}