refactor(Tumblr): Use a common filter patch (#479)

Co-authored-by: oSumAtrIX <johan.melkonyan1@web.de>

integrations/java/app/revanced/tumblr/patches/TimelineFilterPatch.java

@@ -0,0 +1,32 @@
+package app.revanced.tumblr.patches;
+
+import com.tumblr.rumblr.model.TimelineObject;
+import com.tumblr.rumblr.model.Timelineable;
+
+import java.util.HashSet;
+import java.util.List;
+
+public final class TimelineFilterPatch {
+    private static final HashSet<String> blockedObjectTypes = new HashSet<>();
+
+    static {
+        // This dummy gets removed by the TimelineFilterPatch and in its place,
+        // equivalent instructions with a different constant string
+        // will be inserted for each Timeline object type filter.
+        // Modifying this line may break the patch.
+        blockedObjectTypes.add("BLOCKED_OBJECT_DUMMY");
+    }
+
+    // Calls to this method are injected where the list of Timeline objects is first received.
+    // We modify the list filter out elements that we want to hide.
+    public static void filterTimeline(final List<TimelineObject<? extends Timelineable>> timelineObjects) {
+        final var iterator = timelineObjects.iterator();
+        while (iterator.hasNext()) {
+            var timelineElement = iterator.next();
+            if (timelineElement == null) continue;
+
+            String elementType = timelineElement.getData().getTimelineObjectType().toString();
+            if (blockedObjectTypes.contains(elementType)) iterator.remove();
+        }
+    }
+}