Use new way of specifying stream count

extractor/src/main/java/org/schabi/newpipe/extractor/ListExtractor.java

@@ -3,16 +3,33 @@ package org.schabi.newpipe.extractor;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.extractor.linkhandler.ListLinkHandler;
 
-import javax.annotation.Nonnull;
 import java.io.IOException;
 import java.util.Collections;
 import java.util.List;
 
+import javax.annotation.Nonnull;
+
 /**
  * Base class to extractors that have a list (e.g. playlists, users).
  */
 public abstract class ListExtractor<R extends InfoItem> extends Extractor {
 
+    /**
+     * Constant that should be returned whenever
+     * a list has an unknown number of items.
+     */
+    public static final long ITEM_COUNT_UNKNOWN = -1;
+    /**
+     * Constant that should be returned whenever a list has an
+     * infinite number of items. For example a YouTube mix.
+     */
+    public static final long ITEM_COUNT_INFINITE = -2;
+    /**
+     * Constant that should be returned whenever a list
+     * has an unknown number of items bigger than 100.
+     */
+    public static final long ITEM_COUNT_MORE_THAN_100 = -3;
+
     public ListExtractor(StreamingService service, ListLinkHandler linkHandler) {
         super(service, linkHandler);
     }

extractor/src/main/java/org/schabi/newpipe/extractor/playlist/PlaylistExtractor.java

@@ -7,9 +7,6 @@ import org.schabi.newpipe.extractor.linkhandler.ListLinkHandler;
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 
 public abstract class PlaylistExtractor extends ListExtractor<StreamInfoItem> {
-    public final static long UNKNOWN_ITEMS = -1;
-    public final static long INFINITE_ITEMS = -2;
-    public final static long MORE_THAN_100_ITEMS = -3;
 
     public PlaylistExtractor(StreamingService service, ListLinkHandler linkHandler) {
         super(service, linkHandler);

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeSearchExtractor.java

@@ -30,8 +30,6 @@ import java.util.Map;
 
 import javax.annotation.Nonnull;
 
-import static org.schabi.newpipe.extractor.playlist.PlaylistExtractor.MORE_THAN_100_ITEMS;
-import static org.schabi.newpipe.extractor.playlist.PlaylistExtractor.UNKNOWN_ITEMS;
 import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeParsingHelper.fixThumbnailUrl;
 import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeParsingHelper.getJsonResponse;
 import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeParsingHelper.getTextFromObject;
@@ -531,12 +529,12 @@ public class YoutubeSearchExtractor extends SearchExtractor {
 
                         @Override
                         public long getStreamCount() throws ParsingException {
-                            if (searchType.equals(MUSIC_ALBUMS)) return UNKNOWN_ITEMS;
+                            if (searchType.equals(MUSIC_ALBUMS)) return ITEM_COUNT_UNKNOWN;
                             String count = getTextFromObject(info.getArray("flexColumns").getObject(2)
                                     .getObject("musicResponsiveListItemFlexColumnRenderer").getObject("text"));
                             if (count != null && !count.isEmpty()) {
                                 if (count.contains("100+")) {
-                                    return MORE_THAN_100_ITEMS;
+                                    return ITEM_COUNT_MORE_THAN_100;
                                 } else {
                                     return Long.parseLong(Utils.removeNonDigitCharacters(count));
                                 }