fix discretisation with multiple columns

src/main/java/be/uantwerpen/ldataminining/preprocessing/ArffDenseUtils.java

@@ -16,6 +16,8 @@ import java.util.Map;
 import java.util.Set;
 import java.util.TreeMap;
 
+import org.apache.commons.io.FileUtils;
+
 import com.google.common.collect.ArrayListMultimap;
 import com.google.common.collect.Multimap;
 
@@ -450,6 +452,11 @@ public class ArffDenseUtils {
 		if(!tempFile.getPath().equals(outputFile.getPath())){
 			tempFile.renameTo(outputFile);
 		}
+
+		//if the input and output are the same we need to copy tempFile
+		if(outputFile.getPath().equals(file.getPath())){
+			FileUtils.copyFile(tempFile, outputFile);
+		}
 		timer.end();
 	}
 

src/main/java/be/uantwerpen/mime_webapp/controller/TransformController.java

@@ -23,6 +23,7 @@ import java.util.TreeSet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpSession;
 
+import org.apache.commons.io.FileUtils;
 import org.codehaus.jackson.map.ObjectMapper;
 import org.codehaus.jackson.type.TypeReference;
 import org.springframework.web.bind.annotation.PostMapping;
@@ -355,6 +356,7 @@ public class TransformController extends AbstractController{
 				File input = currentInput.getFile();
 				List<Map<String,String>> stats = ArffStatistics.getAllAttributeStatisticsFast(input);
 				for(String name: columnsArr) {
+					System.out.println(name);
 					int idx = names.indexOf(name);
 					final double min = Double.parseDouble(stats.get(idx).get("min"));
 					final double max = Double.parseDouble(stats.get(idx).get("max"));