Track: handle bad URLs better, properly serialise artist, allow for clearing input stream.

src/main/java/moe/nekojimi/chords/Track.java

@@ -9,14 +9,13 @@ import com.amihaiemil.eoyaml.Yaml;
 import com.amihaiemil.eoyaml.YamlMapping;
 import com.amihaiemil.eoyaml.YamlSequence;
 import com.amihaiemil.eoyaml.YamlSequenceBuilder;
-import java.io.File;
+import java.io.*;
-import java.io.FileInputStream;
-import java.io.FileNotFoundException;
-import java.io.InputStream;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 /**
  *
@@ -63,14 +62,17 @@ public class Track implements Comparable<Track>
                 .add("url", url.toExternalForm())
                 .add("location", location.getAbsolutePath())
                 .add("num", Integer.toString(number))
-                .add("formats", build.build())
+                //                .add("formats", build.build())
+                .add("artist", artist)
                 //                .add("requestedBy", requestedBy)
                 //                .add("requestedIn", requestedIn)
                 .add("kept", Boolean.toString(kept))
                 .build();
     }
 
-    public static Track fromYaml(YamlMapping map) throws MalformedURLException
+    public static Track fromYaml(YamlMapping map)
+    {
+        try
         {
             Track track = new Track(new URL(map.string("url")), null);
             track.setArtist(map.string("artist"));
@@ -81,13 +83,18 @@ public class Track implements Comparable<Track>
 //        track.setRequestedBy(map.string("requestedBy"));
 //        track.setRequestedIn(map.string("requestedIn"));
 
-        List<Format> formats = new ArrayList<>();
+//            List<Format> formats = new ArrayList<>();
-        YamlSequence formatSeq = map.yamlSequence("formats");
+//            YamlSequence formatSeq = map.yamlSequence("formats");
-        for (int i = 0; i < formats.size(); i++)
+//            for (int i = 0; i < formats.size(); i++)
-            formats.add(Format.fromYaml(formatSeq.yamlMapping(i)));
+//                formats.add(Format.fromYaml(formatSeq.yamlMapping(i)));
-        track.setFormats(formats);
+//            track.setFormats(formats);
 
             return track;
+        } catch (MalformedURLException ex)
+        {
+            Logger.getLogger(Track.class.getName()).log(Level.SEVERE, null, ex);
+            return null;
+        }
     }
 
     public boolean isDownloaded()
@@ -152,6 +159,21 @@ public class Track implements Comparable<Track>
         this.inputStream = inputStream;
     }
 
+    void clearInputStream()
+    {
+        if (inputStream != null)
+        {
+            try
+            {
+                inputStream.close();
+            } catch (IOException ex)
+            {
+                Logger.getLogger(Track.class.getName()).log(Level.SEVERE, null, ex);
+            }
+            inputStream = null;
+        }
+    }
+
     void delete()
     {
         if (location != null)