Load only favorite IDs instead of whole FeedItems

core/src/main/java/de/danoeh/antennapod/core/export/favorites/FavoritesWriter.java

@@ -3,13 +3,13 @@ package de.danoeh.antennapod.core.export.favorites;
 import android.content.Context;
 import android.util.Log;
 
+import de.danoeh.antennapod.model.feed.FeedItemFilter;
 import org.apache.commons.io.IOUtils;
 
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.Writer;
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 import java.util.TreeMap;
@@ -22,9 +22,6 @@ import de.danoeh.antennapod.core.storage.DBReader;
 /** Writes saved favorites to file. */
 public class FavoritesWriter implements ExportWriter {
     private static final String TAG = "FavoritesWriter";
-
-    private static final int PAGE_LIMIT = 100;
-
     private static final String FAVORITE_TEMPLATE = "html-export-favorites-item-template.html";
     private static final String FEED_TEMPLATE = "html-export-feed-template.html";
     private static final String UTF_8 = "UTF-8";
@@ -45,7 +42,9 @@ public class FavoritesWriter implements ExportWriter {
         InputStream feedTemplateStream = context.getAssets().open(FEED_TEMPLATE);
         String feedTemplate = IOUtils.toString(feedTemplateStream, UTF_8);
 
-        Map<Long, List<FeedItem>> favoriteByFeed = getFeedMap(getFavorites());
+        List<FeedItem> allFavorites = DBReader.getRecentlyPublishedEpisodes(0, Integer.MAX_VALUE,
+                new FeedItemFilter(FeedItemFilter.IS_FAVORITE));
+        Map<Long, List<FeedItem>> favoriteByFeed = getFeedMap(allFavorites);
 
         writer.append(templateParts[0]);
 
@@ -66,23 +65,6 @@ public class FavoritesWriter implements ExportWriter {
         Log.d(TAG, "Finished writing document");
     }
 
-    private List<FeedItem> getFavorites() {
-        int page = 0;
-
-        List<FeedItem> favoritesList = new ArrayList<>();
-        List<FeedItem> favoritesPage;
-        do {
-            favoritesPage = DBReader.getFavoriteItemsList(page * PAGE_LIMIT, PAGE_LIMIT);
-            favoritesList.addAll(favoritesPage);
-            ++page;
-        } while (!favoritesPage.isEmpty() && favoritesPage.size() == PAGE_LIMIT);
-
-        // sort in descending order
-        Collections.sort(favoritesList, (lhs, rhs) -> rhs.getPubDate().compareTo(lhs.getPubDate()));
-
-        return favoritesList;
-    }
-
     /**
      * Group favorite episodes by feed, sorting them by publishing date in descending order.
      *

core/src/main/java/de/danoeh/antennapod/core/storage/DBReader.java

@@ -337,33 +337,12 @@ public final class DBReader {
         }
     }
 
-    /**
-     * Loads a list of favorite items.
-     *
-     * @param offset The first episode that should be loaded.
-     * @param limit The maximum number of episodes that should be loaded.
-     * @return A list of FeedItems that are marked as favorite.
-     */
-    public static List<FeedItem> getFavoriteItemsList(int offset, int limit) {
-        Log.d(TAG, "getFavoriteItemsList() called");
-
-        PodDBAdapter adapter = PodDBAdapter.getInstance();
-        adapter.open();
-        try (Cursor cursor = adapter.getFavoritesCursor(offset, limit)) {
-            List<FeedItem> items = extractItemlistFromCursor(adapter, cursor);
-            loadAdditionalFeedItemListData(items);
-            return items;
-        } finally {
-            adapter.close();
-        }
-    }
-
     private static LongList getFavoriteIDList() {
         Log.d(TAG, "getFavoriteIDList() called");
 
         PodDBAdapter adapter = PodDBAdapter.getInstance();
         adapter.open();
-        try (Cursor cursor = adapter.getFavoritesCursor(0, Integer.MAX_VALUE)) {
+        try (Cursor cursor = adapter.getFavoritesIdsCursor(0, Integer.MAX_VALUE)) {
             LongList favoriteIDs = new LongList(cursor.getCount());
             while (cursor.moveToNext()) {
                 favoriteIDs.add(cursor.getLong(0));

storage/database/src/main/java/de/danoeh/antennapod/storage/database/PodDBAdapter.java

@@ -1005,27 +1005,21 @@ public class PodDBAdapter {
         return db.rawQuery(query, null);
     }
 
-    public final Cursor getFavoritesCursor(int offset, int limit) {
-        final String query = SELECT_FEED_ITEMS_AND_MEDIA
+    public final Cursor getFavoritesIdsCursor(int offset, int limit) {
+        // Way faster than selecting all columns
+        final String query = "SELECT " + TABLE_NAME_FEED_ITEMS + "." + KEY_ID
+                + " FROM " + TABLE_NAME_FEED_ITEMS
                 + " INNER JOIN " + TABLE_NAME_FAVORITES
-                + " ON " + SELECT_KEY_ITEM_ID + " = " + TABLE_NAME_FAVORITES + "." + KEY_FEEDITEM
+                + " ON " + TABLE_NAME_FEED_ITEMS + "." + KEY_ID + " = " + TABLE_NAME_FAVORITES + "." + KEY_FEEDITEM
                 + " ORDER BY " + TABLE_NAME_FEED_ITEMS + "." + KEY_PUBDATE + " DESC"
                 + " LIMIT " + offset + ", " + limit;
         return db.rawQuery(query, null);
     }
 
-    public void setFeedItems(int state) {
-        setFeedItems(Integer.MIN_VALUE, state, 0);
-    }
-
     public void setFeedItems(int oldState, int newState) {
         setFeedItems(oldState, newState, 0);
     }
 
-    public void setFeedItems(int state, long feedId) {
-        setFeedItems(Integer.MIN_VALUE, state, feedId);
-    }
-
     public void setFeedItems(int oldState, int newState, long feedId) {
         String sql = "UPDATE " + TABLE_NAME_FEED_ITEMS + " SET " + KEY_READ + "=" + newState;
         if (feedId > 0) {