Added help printout when no args provided

Author: Vicky M

file.out

@@ -0,0 +1,14 @@
+
+<SenseBox:5cc58071facf70001a872bef> a <http://www.w3.org/ns/sosa/Platform>;
+  <http://www.opengis.net/ont/geosparql#wktLiteral> "POINT(13.441607, 52.469905)", "POINT(13.4420608, 52.4705383)",
+    "POINT(13.442437, 52.4705708)", "POINT(52.4705708, 13.442437)";
+  <http://www.w3.org/ns/sosa/hosts> <Sensor:5cc58071facf70001a872bf0>, <Sensor:5cc58071facf70001a872bf1>;
+  <http://www.w3.org/ns/sosa/resultTime> "2019-05-11T17:57:48.949Z", "2019-05-11T17:58:39.542Z",
+    "2019-05-11T18:02:58.328Z", "2019-05-11T18:05:48.536Z", "2019-05-11T18:51:30.618Z",
+    "2019-05-11T18:53:02.765Z" .
+
+<Sensor:5cc58071facf70001a872bf1> a <http://www.w3.org/ns/sosa/Sensor>;
+  <http://www.w3.org/2000/01/rdf-schema#label> "PM2.5" .
+
+<Sensor:5cc58071facf70001a872bf0> a <http://www.w3.org/ns/sosa/Sensor>;
+  <http://www.w3.org/2000/01/rdf-schema#label> "PM10" .

src/main/java/Main.java

@@ -1,4 +1,5 @@
 import org.apache.commons.cli.CommandLine;
+import org.apache.commons.cli.HelpFormatter;
 import org.apache.commons.cli.MissingOptionException;
 import org.apache.commons.cli.ParseException;
 
@@ -10,8 +11,9 @@
 public class Main {
     public static void main(String[] args) throws ParseException, IOException {
 
+        Config c = new Config();
         try {
-            CommandLine config = new Config().parseArgs(args);
+            CommandLine config = c.parseArgs(args);
 
             if (config.hasOption("osm")) {
                 new OpenSenseMapHandler().handleConfig(config);
@@ -20,8 +22,8 @@ public static void main(String[] args) throws ParseException, IOException {
                 System.out.println("Please refer to the README.");
             }
         } catch (MissingOptionException e) {
-            System.out.println("You are missing the following options: " + e.getMissingOptions());
-            System.out.println("Please refer to the README.");
+            System.out.println("How to use");
+            c.printHelp();
         }
     }
 }

src/main/java/osm/util/OpenSenseMapHandler.java

@@ -1,6 +1,9 @@
 package osm.util;
 
 import org.apache.commons.cli.CommandLine;
+import org.apache.commons.cli.HelpFormatter;
+import org.apache.commons.cli.Option;
+import org.apache.commons.cli.Options;
 import org.eclipse.rdf4j.model.Statement;
 
 import osm.models.Location;
@@ -15,6 +18,7 @@
 public class OpenSenseMapHandler {
 
     public void handleConfig(CommandLine config) throws IOException {
+
         SenseBox senseBox = OpenSenseMapApi.getSenseBox(config.getOptionValue("osm"));
 
         List<Statement> statements = RdfConverter.convertSenseBoxToStatements(senseBox);

src/main/java/util/Config.java

@@ -47,9 +47,16 @@ public Config() {
                 .argName("/path/to/file.rdf")
                 .desc("Path to output file.")
                 .build());
+
     }
 
     public CommandLine parseArgs(String[] args) throws ParseException {
         return new DefaultParser().parse(options, args);
     }
+
+    public void printHelp() {
+        HelpFormatter hf = new HelpFormatter();
+        hf.printHelp("OSM to RDF Parser ", options);
+    }
+
 }