Implemented logging

Also fixed a minor issue where the configuration HashMap was not initialized and threw a NullPointerException.

.gitignore

@@ -1,2 +1,3 @@
 # Project exclude paths
 /target/
+.idea/

src/main/java/de/b00tload/tools/lastfmtospotifyplaylist/LastFMToSpotify.java

@@ -15,12 +15,15 @@ import java.io.IOException;
 import java.net.URI;
 import java.util.HashMap;
 
+import static de.b00tload.tools.lastfmtospotifyplaylist.util.Logger.logLn;
+
 public class LastFMToSpotify {
 
     public static final String LINE_SEPERATOR = System.getProperty("line.separator");
     public static HashMap<String, String> configuration;
 
     public static void main(String[] args) {
+        configuration = new HashMap<>();
         configuration.put("requests.useragent", "LastFMToSpotify/1.0-Snapshot (" + System.getProperty("os.name") + "; " + System.getProperty("os.arch") + ") Java/"+System.getProperty("java.version"));
         for(int a = 0; a<args.length; a++){
             Arguments arg;
@@ -44,6 +47,11 @@ public class LastFMToSpotify {
             }
         }
 
+        logLn("Priority 0",0 );
+        logLn("Priority 1",1 );
+        logLn("Priority 2",2 );
+        logLn("Priority 3",3 );
+
         // Start Progress Bar
         try (ProgressBar pb = new ProgressBar("LastFM -> Spotify Playlist", 4)) {
             for (int progress = 1; progress<=5; progress++) {

src/main/java/de/b00tload/tools/lastfmtospotifyplaylist/arguments/ArgumentHandler.java

@@ -53,7 +53,13 @@ public class ArgumentHandler {
     }
 
     private static void verbose(String value){
-        //wenn value != int
+        try {
+            int loglevel = Integer.parseInt(value);
+            configuration.put("logging.level", String.valueOf(loglevel));
+        } catch (NumberFormatException e) {
             System.out.println("LogLevel must be a numeric value.");
+            System.exit(500);
+        }
+
     }
 }

src/main/java/de/b00tload/tools/lastfmtospotifyplaylist/util/Logger.java

@@ -5,7 +5,9 @@ import static de.b00tload.tools.lastfmtospotifyplaylist.LastFMToSpotify.configur
 public class Logger {
 
     public static void logLn(String string, int priority){
-        if(Integer.parseInt(configuration.get("verbose.level")))
+        if(Integer.parseInt(configuration.get("logging.level"))>=priority){
+            System.out.println(string);
+        }
     }
 
 }