Merge pull request #3315 from damoasda/Queue-Sort-Order2

Queue sort order - with keep sorted checkbox

app/src/main/java/de/danoeh/antennapod/fragment/QueueFragment.java

@@ -49,6 +49,7 @@ import de.danoeh.antennapod.core.util.Converter;
 import de.danoeh.antennapod.core.util.FeedItemUtil;
 import de.danoeh.antennapod.core.util.LongList;
 import de.danoeh.antennapod.core.util.QueueSorter;
+import de.danoeh.antennapod.core.util.SortOrder;
 import de.danoeh.antennapod.dialog.EpisodesApplyActionFragment;
 import de.danoeh.antennapod.menuhandler.FeedItemMenuHandler;
 import de.danoeh.antennapod.menuhandler.MenuItemUtils;
@@ -276,6 +277,19 @@ public class QueueFragment extends Fragment {
 
             MenuItemUtils.refreshLockItem(getActivity(), menu);
 
+            // Show Lock Item only if queue is sorted manually
+            boolean keepSorted = UserPreferences.isQueueKeepSorted();
+            MenuItem lockItem = menu.findItem(R.id.queue_lock);
+            lockItem.setVisible(!keepSorted);
+
+            // Random sort is not supported in keep sorted mode
+            MenuItem sortRandomItem = menu.findItem(R.id.queue_sort_random);
+            sortRandomItem.setVisible(!keepSorted);
+
+            // Set keep sorted checkbox
+            MenuItem keepSortedItem = menu.findItem(R.id.queue_keep_sorted);
+            keepSortedItem.setChecked(keepSorted);
+
             isUpdatingFeeds = MenuItemUtils.updateRefreshMenuItem(menu, R.id.refresh_item, updateRefreshMenuItemChecker);
         }
     }
@@ -325,37 +339,50 @@ public class QueueFragment extends Fragment {
                             EpisodesApplyActionFragment.newInstance(queue, ACTION_DELETE | ACTION_REMOVE_FROM_QUEUE));
                     return true;
                 case R.id.queue_sort_episode_title_asc:
-                    QueueSorter.sort(getActivity(), QueueSorter.Rule.EPISODE_TITLE_ASC, true);
+                    setSortOrder(SortOrder.EPISODE_TITLE_A_Z);
                     return true;
                 case R.id.queue_sort_episode_title_desc:
-                    QueueSorter.sort(getActivity(), QueueSorter.Rule.EPISODE_TITLE_DESC, true);
+                    setSortOrder(SortOrder.EPISODE_TITLE_Z_A);
                     return true;
                 case R.id.queue_sort_date_asc:
-                    QueueSorter.sort(getActivity(), QueueSorter.Rule.DATE_ASC, true);
+                    setSortOrder(SortOrder.DATE_OLD_NEW);
                     return true;
                 case R.id.queue_sort_date_desc:
-                    QueueSorter.sort(getActivity(), QueueSorter.Rule.DATE_DESC, true);
+                    setSortOrder(SortOrder.DATE_NEW_OLD);
                     return true;
                 case R.id.queue_sort_duration_asc:
-                    QueueSorter.sort(getActivity(), QueueSorter.Rule.DURATION_ASC, true);
+                    setSortOrder(SortOrder.DURATION_SHORT_LONG);
                     return true;
                 case R.id.queue_sort_duration_desc:
-                    QueueSorter.sort(getActivity(), QueueSorter.Rule.DURATION_DESC, true);
+                    setSortOrder(SortOrder.DURATION_LONG_SHORT);
                     return true;
                 case R.id.queue_sort_feed_title_asc:
-                    QueueSorter.sort(getActivity(), QueueSorter.Rule.FEED_TITLE_ASC, true);
+                    setSortOrder(SortOrder.FEED_TITLE_A_Z);
                     return true;
                 case R.id.queue_sort_feed_title_desc:
-                    QueueSorter.sort(getActivity(), QueueSorter.Rule.FEED_TITLE_DESC, true);
+                    setSortOrder(SortOrder.FEED_TITLE_Z_A);
                     return true;
                 case R.id.queue_sort_random:
-                    QueueSorter.sort(getActivity(), QueueSorter.Rule.RANDOM, true);
+                    setSortOrder(SortOrder.RANDOM);
                     return true;
                 case R.id.queue_sort_smart_shuffle_asc:
-                    QueueSorter.sort(getActivity(), QueueSorter.Rule.SMART_SHUFFLE_ASC, true);
+                    setSortOrder(SortOrder.SMART_SHUFFLE_OLD_NEW);
                     return true;
                 case R.id.queue_sort_smart_shuffle_desc:
-                    QueueSorter.sort(getActivity(), QueueSorter.Rule.SMART_SHUFFLE_DESC, true);
+                    setSortOrder(SortOrder.SMART_SHUFFLE_NEW_OLD);
+                    return true;
+                case R.id.queue_keep_sorted:
+                    boolean keepSortedOld = UserPreferences.isQueueKeepSorted();
+                    boolean keepSortedNew = !keepSortedOld;
+                    UserPreferences.setQueueKeepSorted(keepSortedNew);
+                    if (keepSortedNew) {
+                        SortOrder sortOrder = UserPreferences.getQueueKeepSortedOrder();
+                        QueueSorter.sort(sortOrder, true);
+                        recyclerAdapter.setLocked(true);
+                    } else {
+                        recyclerAdapter.setLocked(UserPreferences.isQueueLocked());
+                    }
+                    getActivity().invalidateOptionsMenu();
                     return true;
                 default:
                     return false;
@@ -365,6 +392,15 @@ public class QueueFragment extends Fragment {
         }
     }
 
+    /**
+     * This method is called if the user clicks on a sort order menu item.
+     *
+     * @param sortOrder New sort order.
+     */
+    private void setSortOrder(SortOrder sortOrder) {
+        UserPreferences.setQueueKeepSortedOrder(sortOrder);
+        QueueSorter.sort(sortOrder, true);
+    }
 
     @Override
     public boolean onContextItemSelected(MenuItem item) {
@@ -670,5 +706,4 @@ public class QueueFragment extends Fragment {
                     }
                 }, error -> Log.e(TAG, Log.getStackTraceString(error)));
     }
-
 }

app/src/main/java/de/danoeh/antennapod/menuhandler/FeedItemMenuHandler.java

@@ -15,7 +15,6 @@ import de.danoeh.antennapod.core.gpoddernet.model.GpodnetEpisodeAction.Action;
 import de.danoeh.antennapod.core.preferences.GpodnetPreferences;
 import de.danoeh.antennapod.core.preferences.UserPreferences;
 import de.danoeh.antennapod.core.service.playback.PlaybackService;
-import de.danoeh.antennapod.core.storage.DBTasks;
 import de.danoeh.antennapod.core.storage.DBWriter;
 import de.danoeh.antennapod.core.util.FeedItemUtil;
 import de.danoeh.antennapod.core.util.IntentUtils;
@@ -68,16 +67,17 @@ public class FeedItemMenuHandler {
         }
         boolean hasMedia = selectedItem.getMedia() != null;
         boolean isPlaying = hasMedia && selectedItem.getState() == FeedItem.State.PLAYING;
+        boolean keepSorted = UserPreferences.isQueueKeepSorted();
 
         if (!isPlaying) {
             mi.setItemVisibility(R.id.skip_episode_item, false);
         }
 
         boolean isInQueue = selectedItem.isTagged(FeedItem.TAG_QUEUE);
-        if(queueAccess == null || queueAccess.size() == 0 || queueAccess.get(0) == selectedItem.getId()) {
+        if (queueAccess == null || queueAccess.size() == 0 || queueAccess.get(0) == selectedItem.getId() || keepSorted) {
             mi.setItemVisibility(R.id.move_to_top_item, false);
         }
-        if(queueAccess == null || queueAccess.size() == 0 || queueAccess.get(queueAccess.size()-1) == selectedItem.getId()) {
+        if (queueAccess == null || queueAccess.size() == 0 || queueAccess.get(queueAccess.size()-1) == selectedItem.getId() || keepSorted) {
             mi.setItemVisibility(R.id.move_to_bottom_item, false);
         }
         if (!isInQueue) {

app/src/main/res/menu/queue.xml

@@ -102,6 +102,11 @@
                         android:title="@string/sort_new_to_old"/>
                 </menu>
             </item>
+
+            <item
+                android:id="@+id/queue_keep_sorted"
+                android:title="@string/keep_sorted"
+                android:checkable="true" />
         </menu>
     </item>
 

core/src/main/java/de/danoeh/antennapod/core/preferences/UserPreferences.java

@@ -29,6 +29,7 @@ import de.danoeh.antennapod.core.storage.APNullCleanupAlgorithm;
 import de.danoeh.antennapod.core.storage.APQueueCleanupAlgorithm;
 import de.danoeh.antennapod.core.storage.EpisodeCleanupAlgorithm;
 import de.danoeh.antennapod.core.util.Converter;
+import de.danoeh.antennapod.core.util.SortOrder;
 import de.danoeh.antennapod.core.util.download.AutoUpdateManager;
 
 /**
@@ -59,6 +60,8 @@ public class UserPreferences {
 
     // Queue
     private static final String PREF_QUEUE_ADD_TO_FRONT = "prefQueueAddToFront";
+    public static final String PREF_QUEUE_KEEP_SORTED = "prefQueueKeepSorted";
+    public static final String PREF_QUEUE_KEEP_SORTED_ORDER = "prefQueueKeepSortedOrder";
 
     // Playback
     public static final String PREF_PAUSE_ON_HEADSET_DISCONNECT = "prefPauseOnHeadsetDisconnect";
@@ -534,7 +537,8 @@ public class UserPreferences {
     }
 
     public static boolean isQueueLocked() {
-        return prefs.getBoolean(PREF_QUEUE_LOCKED, false);
+        return prefs.getBoolean(PREF_QUEUE_LOCKED, false)
+                || isQueueKeepSorted();
     }
 
     public static void setFastForwardSecs(int secs) {
@@ -909,4 +913,49 @@ public class UserPreferences {
     public static boolean timeRespectsSpeed() {
         return prefs.getBoolean(PREF_TIME_RESPECTS_SPEED, false);
     }
+
+    /**
+     * Returns if the queue is in keep sorted mode.
+     *
+     * @see #getQueueKeepSortedOrder()
+     */
+    public static boolean isQueueKeepSorted() {
+        return prefs.getBoolean(PREF_QUEUE_KEEP_SORTED, false);
+    }
+
+    /**
+     * Enables/disables the keep sorted mode of the queue.
+     *
+     * @see #setQueueKeepSortedOrder(SortOrder)
+     */
+    public static void setQueueKeepSorted(boolean keepSorted) {
+        prefs.edit()
+                .putBoolean(PREF_QUEUE_KEEP_SORTED, keepSorted)
+                .apply();
+    }
+
+    /**
+     * Returns the sort order for the queue keep sorted mode.
+     * Note: This value is stored independently from the keep sorted state.
+     *
+     * @see #isQueueKeepSorted()
+     */
+    public static SortOrder getQueueKeepSortedOrder() {
+        String sortOrderStr = prefs.getString(PREF_QUEUE_KEEP_SORTED_ORDER, "use-default");
+        return SortOrder.parseWithDefault(sortOrderStr, SortOrder.DATE_NEW_OLD);
+    }
+
+    /**
+     * Sets the sort order for the queue keep sorted mode.
+     *
+     * @see #setQueueKeepSorted(boolean)
+     */
+    public static void setQueueKeepSortedOrder(SortOrder sortOrder) {
+        if (sortOrder == null) {
+            return;
+        }
+        prefs.edit()
+                .putString(PREF_QUEUE_KEEP_SORTED_ORDER, sortOrder.name())
+                .apply();
+    }
 }

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

@@ -11,11 +11,8 @@ import android.util.Log;
 import org.greenrobot.eventbus.EventBus;
 
 import java.io.File;
-import java.io.UnsupportedEncodingException;
-import java.net.URLEncoder;
 import java.util.ArrayList;
 import java.util.Collections;
-import java.util.Comparator;
 import java.util.Date;
 import java.util.List;
 import java.util.Set;
@@ -44,6 +41,8 @@ import de.danoeh.antennapod.core.service.playback.PlaybackService;
 import de.danoeh.antennapod.core.util.IntentUtils;
 import de.danoeh.antennapod.core.util.LongList;
 import de.danoeh.antennapod.core.util.Permutor;
+import de.danoeh.antennapod.core.util.QueueSorter;
+import de.danoeh.antennapod.core.util.SortOrder;
 
 /**
  * Provides methods for writing data to AntennaPod's database.
@@ -383,6 +382,7 @@ public class DBWriter {
                         }
                     }
                     if (queueModified) {
+                        applySortOrder(queue, events);
                         adapter.setQueue(queue);
                         for (QueueEvent event : events) {
                             EventBus.getDefault().post(event);
@@ -401,6 +401,33 @@ public class DBWriter {
         });
     }
 
+    /**
+     * Sorts the queue depending on the configured sort order.
+     * If the queue is not in keep sorted mode, nothing happens.
+     *
+     * @param queue  The queue to be sorted.
+     * @param events Replaces the events by a single SORT event if the list has to be sorted automatically.
+     */
+    private static void applySortOrder(List<FeedItem> queue, List<QueueEvent> events) {
+        if (!UserPreferences.isQueueKeepSorted()) {
+            // queue is not in keep sorted mode, there's nothing to do
+            return;
+        }
+
+        // Sort queue by configured sort order
+        SortOrder sortOrder = UserPreferences.getQueueKeepSortedOrder();
+        if (sortOrder == SortOrder.RANDOM) {
+            // do not shuffle the list on every change
+            return;
+        }
+        Permutor<FeedItem> permutor = QueueSorter.getPermutor(sortOrder);
+        permutor.reorder(queue);
+
+        // Replace ADDED events by a single SORTED event
+        events.clear();
+        events.add(QueueEvent.sorted(queue));
+    }
+
     /**
      * Removes all FeedItem objects from the queue.
      *
@@ -850,31 +877,8 @@ public class DBWriter {
     }
 
     /**
-     * Sort the FeedItems in the queue with the given Comparator.
+     * Sort the FeedItems in the queue with the given Permutor.
-     * @param comparator      FeedItem comparator
+     *
-     * @param broadcastUpdate true if this operation should trigger a QueueUpdateBroadcast. This option should be set to
-     */
-    public static Future<?> sortQueue(final Comparator<FeedItem> comparator, final boolean broadcastUpdate) {
-        return dbExec.submit(() -> {
-            final PodDBAdapter adapter = PodDBAdapter.getInstance();
-            adapter.open();
-            final List<FeedItem> queue = DBReader.getQueue(adapter);
-
-            if (queue != null) {
-                Collections.sort(queue, comparator);
-                adapter.setQueue(queue);
-                if (broadcastUpdate) {
-                    EventBus.getDefault().post(QueueEvent.sorted(queue));
-                }
-            } else {
-                Log.e(TAG, "sortQueue: Could not load queue");
-            }
-            adapter.close();
-        });
-    }
-
-    /**
-     * Similar to sortQueue, but allows more complex reordering by providing whole-queue context.
      * @param permutor        Encapsulates whole-Queue reordering logic.
      * @param broadcastUpdate <code>true</code> if this operation should trigger a
      *                        QueueUpdateBroadcast. This option should be set to <code>false</code>

core/src/main/java/de/danoeh/antennapod/core/util/QueueSorter.java

@@ -1,7 +1,5 @@
 package de.danoeh.antennapod.core.util;
 
-import android.content.Context;
-
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Comparator;
@@ -17,38 +15,48 @@ import de.danoeh.antennapod.core.storage.DBWriter;
  * Provides method for sorting the queue according to rules.
  */
 public class QueueSorter {
-    public enum Rule {
+
-        EPISODE_TITLE_ASC,
+    /**
-        EPISODE_TITLE_DESC,
+     * Sorts the queue by the given sort order and sends a broadcast update.
-        DATE_ASC,
+     *
-        DATE_DESC,
+     * @param sortOrder Sort order.
-        DURATION_ASC,
+     * @param broadcastUpdate Send broadcast update?
-        DURATION_DESC,
+     */
-        FEED_TITLE_ASC,
+    public static void sort(SortOrder sortOrder, boolean broadcastUpdate) {
-        FEED_TITLE_DESC,
+        Permutor<FeedItem> permutor = getPermutor(sortOrder);
-        RANDOM,
+        if (permutor != null) {
-        SMART_SHUFFLE_ASC,
+            DBWriter.reorderQueue(permutor, broadcastUpdate);
-        SMART_SHUFFLE_DESC
+        }
+    }
+
+    /**
+     * Returns a Permutor that sorts a list appropriate to the given sort order.
+     *
+     * @param sortOrder Sort order.
+     * @return Permutor that sorts a list appropriate to the given sort order. <code>null</code> if the order is unknown or <code>null</code>.
+     */
+    public static Permutor<FeedItem> getPermutor(SortOrder sortOrder) {
+        if (sortOrder == null) {
+            return null;
         }
 
-    public static void sort(final Context context, final Rule rule, final boolean broadcastUpdate) {
         Comparator<FeedItem> comparator = null;
         Permutor<FeedItem> permutor = null;
 
-        switch (rule) {
+        switch (sortOrder) {
-            case EPISODE_TITLE_ASC:
+            case EPISODE_TITLE_A_Z:
                 comparator = (f1, f2) -> f1.getTitle().compareTo(f2.getTitle());
                 break;
-            case EPISODE_TITLE_DESC:
+            case EPISODE_TITLE_Z_A:
                 comparator = (f1, f2) -> f2.getTitle().compareTo(f1.getTitle());
                 break;
-            case DATE_ASC:
+            case DATE_OLD_NEW:
                 comparator = (f1, f2) -> f1.getPubDate().compareTo(f2.getPubDate());
                 break;
-            case DATE_DESC:
+            case DATE_NEW_OLD:
                 comparator = (f1, f2) -> f2.getPubDate().compareTo(f1.getPubDate());
                 break;
-            case DURATION_ASC:
+            case DURATION_SHORT_LONG:
                 comparator = (f1, f2) -> {
                     FeedMedia f1Media = f1.getMedia();
                     FeedMedia f2Media = f2.getMedia();
@@ -61,7 +69,7 @@ public class QueueSorter {
                         return duration1 - duration2;
                 };
                 break;
-            case DURATION_DESC:
+            case DURATION_LONG_SHORT:
                 comparator = (f1, f2) -> {
                     FeedMedia f1Media = f1.getMedia();
                     FeedMedia f2Media = f2.getMedia();
@@ -71,29 +79,28 @@ public class QueueSorter {
                     return -1 * (duration1 - duration2);
                 };
                 break;
-            case FEED_TITLE_ASC:
+            case FEED_TITLE_A_Z:
                 comparator = (f1, f2) -> f1.getFeed().getTitle().compareTo(f2.getFeed().getTitle());
                 break;
-            case FEED_TITLE_DESC:
+            case FEED_TITLE_Z_A:
                 comparator = (f1, f2) -> f2.getFeed().getTitle().compareTo(f1.getFeed().getTitle());
                 break;
             case RANDOM:
                 permutor = Collections::shuffle;
                 break;
-            case SMART_SHUFFLE_ASC:
+            case SMART_SHUFFLE_OLD_NEW:
                 permutor = (queue) -> smartShuffle(queue, true);
                 break;
-            case SMART_SHUFFLE_DESC:
+            case SMART_SHUFFLE_NEW_OLD:
                 permutor = (queue) -> smartShuffle(queue, false);
                 break;
-            default:
         }
 
         if (comparator != null) {
-            DBWriter.sortQueue(comparator, broadcastUpdate);
+            final Comparator<FeedItem> comparator2 = comparator;
-        } else if (permutor != null) {
+            permutor = (queue) -> Collections.sort(queue, comparator2);
-            DBWriter.reorderQueue(permutor, broadcastUpdate);
         }
+        return permutor;
     }
 
     /**

core/src/main/java/de/danoeh/antennapod/core/util/SortOrder.java

@@ -0,0 +1,30 @@
+package de.danoeh.antennapod.core.util;
+
+/**
+ * Provides sort orders to sort a list of episodes.
+ */
+public enum SortOrder {
+    EPISODE_TITLE_A_Z,
+    EPISODE_TITLE_Z_A,
+    DATE_OLD_NEW,
+    DATE_NEW_OLD,
+    DURATION_SHORT_LONG,
+    DURATION_LONG_SHORT,
+    FEED_TITLE_A_Z,
+    FEED_TITLE_Z_A,
+    RANDOM,
+    SMART_SHUFFLE_OLD_NEW,
+    SMART_SHUFFLE_NEW_OLD;
+
+    /**
+     * Converts the string representation to its enum value. If the string value is unknown,
+     * the given default value is returned.
+     */
+    public static SortOrder parseWithDefault(String value, SortOrder defaultValue) {
+        try {
+            return valueOf(value);
+        } catch (IllegalArgumentException e) {
+            return defaultValue;
+        }
+    }
+}

core/src/main/res/values-de/strings.xml

@@ -276,6 +276,7 @@
   <string name="move_to_top_label">Zum Anfang verschieben</string>
   <string name="move_to_bottom_label">Zum Ende verschieben</string>
   <string name="sort">Sortieren</string>
+  <string name="keep_sorted">Automatisch sortieren</string>
   <string name="date">Datum</string>
   <string name="duration">Dauer</string>
   <string name="episode_title">Episodentitel</string>
@@ -285,6 +286,8 @@
   <string name="ascending">Aufsteigend</string>
   <string name="descending">Absteigend</string>
   <string name="clear_queue_confirmation_msg">Bitte bestätige, dass ALLE Episoden aus der Abspielliste entfernt werden sollen</string>
+  <string name="sort_new_to_old">Neu bis alt</string>
+  <string name="sort_old_to_new">Alt bis neu</string>
   <!--Flattr-->
   <string name="flattr_auth_label">Flattr Anmeldung</string>
   <string name="flattr_auth_explanation">Drücke den Button unten, um den Authentifizierungsprozess zu starten. Du wirst zur Flattr-Anmeldeseite weitergeleitet. Hier wirst du gefragt, AntennaPod die Erlaubnis zu geben, Dinge zu flattrn. Nachdem du die Erlaubnis erteilt hast, kehrst du automatisch zu diesem Bildschirm zurück.</string>

core/src/main/res/values/strings.xml

@@ -296,6 +296,7 @@
     <string name="move_to_top_label">Move to top</string>
     <string name="move_to_bottom_label">Move to bottom</string>
     <string name="sort">Sort</string>
+    <string name="keep_sorted">Keep sorted</string>
     <string name="date">Date</string>
     <string name="duration">Duration</string>
     <string name="episode_title">Episode title</string>

core/src/test/java/android/text/TextUtils.java

@@ -29,4 +29,13 @@ public class TextUtils {
         return false;
     }
 
+    /**
+     * Returns <code>true</code> if the string is <code>null</code> or has zero length.
+     *
+     * @param str The string to be examined, can be <code>null</code>.
+     * @return <code>true</code> if the string is <code>null</code> or has zero length.
+     */
+    public static boolean isEmpty(CharSequence str) {
+        return str == null || str.length() == 0;
+    }
 }

core/src/test/java/de/danoeh/antennapod/core/util/QueueSorterTest.java

@@ -0,0 +1,156 @@
+package de.danoeh.antennapod.core.util;
+
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.Calendar;
+import java.util.List;
+
+import de.danoeh.antennapod.core.feed.Feed;
+import de.danoeh.antennapod.core.feed.FeedItem;
+import de.danoeh.antennapod.core.feed.FeedMedia;
+
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.assertNull;
+
+/**
+ * Test class for QueueSorter.
+ */
+public class QueueSorterTest {
+
+    @Test
+    public void testPermutorForRule_null() {
+        assertNull(QueueSorter.getPermutor(null));
+    }
+
+    @Test
+    public void testPermutorForRule_EPISODE_TITLE_ASC() {
+        Permutor<FeedItem> permutor = QueueSorter.getPermutor(SortOrder.EPISODE_TITLE_A_Z);
+
+        List<FeedItem> itemList = getTestList();
+        assertTrue(checkIdOrder(itemList, 1, 3, 2)); // before sorting
+        permutor.reorder(itemList);
+        assertTrue(checkIdOrder(itemList, 1, 2, 3)); // after sorting
+    }
+
+    @Test
+    public void testPermutorForRule_EPISODE_TITLE_DESC() {
+        Permutor<FeedItem> permutor = QueueSorter.getPermutor(SortOrder.EPISODE_TITLE_Z_A);
+
+        List<FeedItem> itemList = getTestList();
+        assertTrue(checkIdOrder(itemList, 1, 3, 2)); // before sorting
+        permutor.reorder(itemList);
+        assertTrue(checkIdOrder(itemList, 3, 2, 1)); // after sorting
+    }
+
+    @Test
+    public void testPermutorForRule_DATE_ASC() {
+        Permutor<FeedItem> permutor = QueueSorter.getPermutor(SortOrder.DATE_OLD_NEW);
+
+        List<FeedItem> itemList = getTestList();
+        assertTrue(checkIdOrder(itemList, 1, 3, 2)); // before sorting
+        permutor.reorder(itemList);
+        assertTrue(checkIdOrder(itemList, 1, 2, 3)); // after sorting
+    }
+
+    @Test
+    public void testPermutorForRule_DATE_DESC() {
+        Permutor<FeedItem> permutor = QueueSorter.getPermutor(SortOrder.DATE_NEW_OLD);
+
+        List<FeedItem> itemList = getTestList();
+        assertTrue(checkIdOrder(itemList, 1, 3, 2)); // before sorting
+        permutor.reorder(itemList);
+        assertTrue(checkIdOrder(itemList, 3, 2, 1)); // after sorting
+    }
+
+    @Test
+    public void testPermutorForRule_DURATION_ASC() {
+        Permutor<FeedItem> permutor = QueueSorter.getPermutor(SortOrder.DURATION_SHORT_LONG);
+
+        List<FeedItem> itemList = getTestList();
+        assertTrue(checkIdOrder(itemList, 1, 3, 2)); // before sorting
+        permutor.reorder(itemList);
+        assertTrue(checkIdOrder(itemList, 1, 2, 3)); // after sorting
+    }
+
+    @Test
+    public void testPermutorForRule_DURATION_DESC() {
+        Permutor<FeedItem> permutor = QueueSorter.getPermutor(SortOrder.DURATION_LONG_SHORT);
+
+        List<FeedItem> itemList = getTestList();
+        assertTrue(checkIdOrder(itemList, 1, 3, 2)); // before sorting
+        permutor.reorder(itemList);
+        assertTrue(checkIdOrder(itemList, 3, 2, 1)); // after sorting
+    }
+
+    @Test
+    public void testPermutorForRule_FEED_TITLE_ASC() {
+        Permutor<FeedItem> permutor = QueueSorter.getPermutor(SortOrder.FEED_TITLE_A_Z);
+
+        List<FeedItem> itemList = getTestList();
+        assertTrue(checkIdOrder(itemList, 1, 3, 2)); // before sorting
+        permutor.reorder(itemList);
+        assertTrue(checkIdOrder(itemList, 1, 2, 3)); // after sorting
+    }
+
+    @Test
+    public void testPermutorForRule_FEED_TITLE_DESC() {
+        Permutor<FeedItem> permutor = QueueSorter.getPermutor(SortOrder.FEED_TITLE_Z_A);
+
+        List<FeedItem> itemList = getTestList();
+        assertTrue(checkIdOrder(itemList, 1, 3, 2)); // before sorting
+        permutor.reorder(itemList);
+        assertTrue(checkIdOrder(itemList, 3, 2, 1)); // after sorting
+    }
+
+    /**
+     * Generates a list with test data.
+     */
+    private List<FeedItem> getTestList() {
+        List<FeedItem> itemList = new ArrayList<>();
+
+        Calendar calendar = Calendar.getInstance();
+        calendar.set(2019, 0, 1);  // January 1st
+        Feed feed1 = new Feed(null, null, "Feed title 1");
+        FeedItem feedItem1 = new FeedItem(1, "Title 1", null, null, calendar.getTime(), 0, feed1);
+        FeedMedia feedMedia1 = new FeedMedia(0, feedItem1, 1000, 0, 0, null, null, null, true, null, 0, 0);
+        feedItem1.setMedia(feedMedia1);
+        itemList.add(feedItem1);
+
+        calendar.set(2019, 2, 1);  // March 1st
+        Feed feed2 = new Feed(null, null, "Feed title 3");
+        FeedItem feedItem2 = new FeedItem(3, "Title 3", null, null, calendar.getTime(), 0, feed2);
+        FeedMedia feedMedia2 = new FeedMedia(0, feedItem2, 3000, 0, 0, null, null, null, true, null, 0, 0);
+        feedItem2.setMedia(feedMedia2);
+        itemList.add(feedItem2);
+
+        calendar.set(2019, 1, 1);  // February 1st
+        Feed feed3 = new Feed(null, null, "Feed title 2");
+        FeedItem feedItem3 = new FeedItem(2, "Title 2", null, null, calendar.getTime(), 0, feed3);
+        FeedMedia feedMedia3 = new FeedMedia(0, feedItem3, 2000, 0, 0, null, null, null, true, null, 0, 0);
+        feedItem3.setMedia(feedMedia3);
+        itemList.add(feedItem3);
+
+        return itemList;
+    }
+
+    /**
+     * Checks if both lists have the same size and the same ID order.
+     *
+     * @param itemList Item list.
+     * @param ids      List of IDs.
+     * @return <code>true</code> if both lists have the same size and the same ID order.
+     */
+    private boolean checkIdOrder(List<FeedItem> itemList, long... ids) {
+        if (itemList.size() != ids.length) {
+            return false;
+        }
+
+        for (int i = 0; i < ids.length; i++) {
+            if (itemList.get(i).getId() != ids[i]) {
+                return false;
+            }
+        }
+        return true;
+    }
+}