Feature points import/export service made static; Inappropriate Optimal return value changed

MeshModel/src/main/java/cz/fidentis/analyst/feature/services/FeaturePointImportExportService.java

@@ -15,14 +15,11 @@ import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileWriter;
 import java.io.IOException;
-import java.io.InputStream;
 import java.io.InputStreamReader;
-import java.io.PrintWriter;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
-import java.util.Optional;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import java.util.stream.Stream;
@@ -36,7 +33,7 @@ public class FeaturePointImportExportService {
     private static final String COLUMN_DELIMETER = ",";
     private static final String CODE_PREFIX_DELIMETER = " ";
 
-    public Optional<List<FeaturePoint>> importFeaturePoints(String path, String fileName) {
+    public static List<FeaturePoint> importFeaturePoints(String path, String fileName) {
         FileResourcesUtils app = new FileResourcesUtils();
         try (InputStreamReader streamReader
                 = new InputStreamReader(app.getFileAsStream(path, fileName), StandardCharsets.UTF_8);
@@ -66,7 +63,7 @@ public class FeaturePointImportExportService {
                 );
                 points.add(point);
             }
-            return Optional.of(points);
+            return points;
 
         } catch (IOException e) {
             throw new FeaturePointException(String.format("Feature point cannot open file", fileName));
@@ -75,11 +72,11 @@ public class FeaturePointImportExportService {
         }
     }
 
-    private String getCode(String str) {
+    private static String getCode(String str) {
         return str.substring(0, str.indexOf(CODE_PREFIX_DELIMETER));
     }
 
-    public void exportFeaturePoints(List<FeaturePoint> featurePointList, String objectName) throws FileNotFoundException, IOException {
+    public static void exportFeaturePoints(List<FeaturePoint> featurePointList, String objectName) throws FileNotFoundException, IOException {
         File csvOutputFile = new File(String.format("%s_landmarks.csv", objectName));
         // CSV is a normal text file, need a writer
         try (BufferedWriter bw = new BufferedWriter(new FileWriter(csvOutputFile))) {