Rename BandcampExtractorHelper.smartConcatenate(String[], String) to Utils.nonEmptyAndNullJoin(String, String[])

extractor/src/main/java/org/schabi/newpipe/extractor/services/bandcamp/extractors/BandcampExtractorHelper.java

@@ -67,35 +67,6 @@ public class BandcampExtractorHelper {
 
     }
 
-    /**
-     * Concatenate all non-null and non-empty strings together while separating them using
-     * the comma parameter
-     */
-    public static String smartConcatenate(final String[] strings, final String comma) {
-        final StringBuilder result = new StringBuilder();
-
-        // Remove empty strings
-        final List<String> list = new ArrayList<>(Arrays.asList(strings));
-        for (int i = list.size() - 1; i >= 0; i--) {
-            if (Utils.isNullOrEmpty(list.get(i)) || list.get(i).equals("null")) {
-                list.remove(i);
-            }
-        }
-
-        // Append remaining strings to result
-        for (int i = 0; i < list.size(); i++) {
-            result.append(list.get(i));
-
-            if (i != list.size() - 1) {
-                // This is not the last iteration yet
-                result.append(comma);
-            }
-
-        }
-
-        return result.toString();
-    }
-
     /**
      * Fetch artist details from mobile endpoint.
      * <a href=https://notabug.org/fynngodau/bandcampDirect/wiki/rewindBandcamp+%E2%80%93+Fetching+artist+details>

extractor/src/main/java/org/schabi/newpipe/extractor/services/bandcamp/extractors/BandcampStreamExtractor.java

@@ -17,6 +17,7 @@ import org.schabi.newpipe.extractor.exceptions.ParsingException;
 import org.schabi.newpipe.extractor.linkhandler.LinkHandler;
 import org.schabi.newpipe.extractor.localization.DateWrapper;
 import org.schabi.newpipe.extractor.stream.*;
+import org.schabi.newpipe.extractor.utils.Utils;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -150,12 +151,13 @@ public class BandcampStreamExtractor extends StreamExtractor {
     @Nonnull
     @Override
     public Description getDescription() {
-        final String s = BandcampExtractorHelper.smartConcatenate(
+        final String s = Utils.nonEmptyAndNullJoin(
+                "\n\n",
                 new String[]{
                         current.getString("about"),
                         current.getString("lyrics"),
                         current.getString("credits")
-                }, "\n\n"
+                }
         );
         return new Description(s, Description.PLAIN_TEXT);
     }

extractor/src/main/java/org/schabi/newpipe/extractor/utils/Utils.java

@@ -271,4 +271,17 @@ public class Utils {
         return join(delimiter, list);
     }
 
+    /**
+     * Concatenate all non-null, non-empty and strings which are not equal to <code>"null"</code>.
+     */
+    public static String nonEmptyAndNullJoin(final String delimiter, final String[] elements) {
+        final List<String> list = Arrays.asList(elements);
+        for (int i = list.size() - 1; i >= 0; i--) {
+            if (isNullOrEmpty(list.get(i)) || list.get(i).equals("null")) {
+                list.remove(i);
+            }
+        }
+
+        return join(delimiter, list);
+    }
 }