Perform tag filtering in chip provider

app/src/main/java/org/tasks/tasklist/TaskListRecyclerAdapter.java

@@ -8,9 +8,7 @@ import androidx.recyclerview.widget.ListUpdateCallback;
 import androidx.recyclerview.widget.RecyclerView;
 import com.todoroo.astrid.activity.TaskListFragment;
 import com.todoroo.astrid.adapter.TaskAdapter;
-import com.todoroo.astrid.api.CaldavFilter;
 import com.todoroo.astrid.api.Filter;
-import com.todoroo.astrid.api.GtasksFilter;
 import com.todoroo.astrid.dao.TaskDao;
 import java.util.List;
 import org.tasks.data.TaskContainer;
@@ -23,7 +21,6 @@ public abstract class TaskListRecyclerAdapter extends RecyclerView.Adapter<ViewH
   private final TaskAdapter adapter;
   private final TaskListFragment taskList;
   private final ViewHolderFactory viewHolderFactory;
-  private final boolean isRemoteList;
   private final TaskDao taskDao;
 
   TaskListRecyclerAdapter(
@@ -34,9 +31,6 @@ public abstract class TaskListRecyclerAdapter extends RecyclerView.Adapter<ViewH
     this.adapter = adapter;
     this.viewHolderFactory = viewHolderFactory;
     this.taskList = taskList;
-    isRemoteList =
-        taskList.getFilter() instanceof GtasksFilter
-            || taskList.getFilter() instanceof CaldavFilter;
     this.taskDao = taskDao;
   }
 
@@ -50,7 +44,7 @@ public abstract class TaskListRecyclerAdapter extends RecyclerView.Adapter<ViewH
   public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
     TaskContainer task = getItem(position);
     if (task != null) {
-      holder.bindView(task, isRemoteList, adapter.supportsManualSorting());
+      holder.bindView(task, taskList.getFilter(), adapter.supportsManualSorting());
       holder.setMoving(false);
       int indent = adapter.getIndent(task);
       task.setIndent(indent);

app/src/main/java/org/tasks/tasklist/ViewHolder.java

@@ -6,9 +6,7 @@ import static com.todoroo.andlib.utility.DateUtilities.getAbbreviatedRelativeDat
 
 import android.annotation.SuppressLint;
 import android.app.Activity;
-import android.content.Intent;
 import android.graphics.Paint;
-import android.net.Uri;
 import android.util.DisplayMetrics;
 import android.view.View;
 import android.view.ViewGroup;
@@ -22,7 +20,9 @@ import butterknife.OnClick;
 import butterknife.OnLongClick;
 import com.google.android.material.chip.Chip;
 import com.google.android.material.chip.ChipGroup;
+import com.todoroo.astrid.api.CaldavFilter;
 import com.todoroo.astrid.api.Filter;
+import com.todoroo.astrid.api.GtasksFilter;
 import com.todoroo.astrid.service.TaskCompleter;
 import com.todoroo.astrid.ui.CheckableImageView;
 import java.util.List;
@@ -195,7 +195,7 @@ public class ViewHolder extends RecyclerView.ViewHolder {
     return Math.round(indent * getShiftSize());
   }
 
-  void bindView(TaskContainer task, boolean isRemoteList, boolean hideSubtasks) {
+  void bindView(TaskContainer task, Filter filter, boolean hideSubtasks) {
     this.task = task;
     this.indent = task.indent;
 
@@ -205,7 +205,7 @@ public class ViewHolder extends RecyclerView.ViewHolder {
     setupTitleAndCheckbox();
     setupDueDate();
     if (preferences.getBoolean(R.string.p_show_list_indicators, true)) {
-      setupChips(isRemoteList, hideSubtasks);
+      setupChips(filter, hideSubtasks);
     }
     if (preferences.getBoolean(R.string.p_show_description, true)) {
       description.setText(task.getNotes());
@@ -261,9 +261,14 @@ public class ViewHolder extends RecyclerView.ViewHolder {
     }
   }
 
-  private void setupChips(boolean isRemoteList, boolean hideSubtaskChip) {
+  private void setupChips(Filter filter, boolean hideSubtaskChip) {
     List<Chip> chips =
-        chipProvider.getChips(context, isRemoteList || indent > 0, hideSubtaskChip, task);
+        chipProvider.getChips(
+            context,
+            filter,
+            indent > 0,
+            hideSubtaskChip,
+            task);
     if (chips.isEmpty()) {
       chipGroup.setVisibility(View.GONE);
     } else {

app/src/main/java/org/tasks/ui/ChipProvider.java

@@ -2,8 +2,9 @@ package org.tasks.ui;
 
 import static com.google.common.collect.Iterables.filter;
 import static com.google.common.collect.Iterables.removeIf;
-import static com.google.common.collect.Lists.newArrayList;
+import static com.google.common.collect.Iterables.transform;
 import static com.google.common.collect.Lists.transform;
+import static com.google.common.collect.Sets.newHashSet;
 import static com.todoroo.andlib.utility.AndroidUtilities.assertMainThread;
 
 import android.app.Activity;
@@ -24,6 +25,7 @@ import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 import javax.inject.Inject;
 import org.tasks.LocalBroadcastManager;
 import org.tasks.R;
@@ -103,7 +105,11 @@ public class ChipProvider {
   }
 
   public List<Chip> getChips(
-      Activity activity, boolean hideListChips, boolean hideSubtaskChip, TaskContainer task) {
+      Activity activity,
+      Filter filter,
+      boolean isSubtask,
+      boolean hideSubtaskChip,
+      TaskContainer task) {
     assertMainThread();
 
     List<Chip> chips = new ArrayList<>();
@@ -127,18 +133,23 @@ public class ChipProvider {
               task.getLocation().getDisplayName(),
               task.getLocation()));
     }
-    if (!hideListChips) {
-      if (!Strings.isNullOrEmpty(task.getGoogleTaskList())) {
+    if (!isSubtask) {
+      if (!Strings.isNullOrEmpty(task.getGoogleTaskList()) && !(filter instanceof GtasksFilter)) {
         chips.add(newTagChip(activity, googleTaskLists.get(task.getGoogleTaskList())));
-      } else if (!Strings.isNullOrEmpty(task.getCaldav())) {
+      } else if (!Strings.isNullOrEmpty(task.getCaldav()) && !(filter instanceof CaldavFilter)) {
         chips.add(newTagChip(activity, caldavCalendars.get(task.getCaldav())));
       }
     }
-    String tags = task.getTagsString();
-    if (!Strings.isNullOrEmpty(tags)) {
-      Iterable<TagFilter> tagFilters =
-          filter(transform(newArrayList(tags.split(",")), tagDatas::get), Predicates.notNull());
-      chips.addAll(transform(orderByName.sortedCopy(tagFilters), tag -> newTagChip(activity, tag)));
+    String tagString = task.getTagsString();
+    if (!Strings.isNullOrEmpty(tagString)) {
+      Set<String> tags = newHashSet(tagString.split(","));
+      if (filter instanceof TagFilter) {
+        tags.remove(((TagFilter) filter).getUuid());
+      }
+      chips.addAll(
+          transform(
+              orderByName.sortedCopy(filter(transform(tags, tagDatas::get), Predicates.notNull())),
+              tag -> newTagChip(activity, tag)));
     }
 
     removeIf(chips, Predicates.isNull());

app/src/main/java/org/tasks/ui/TaskListViewModel.java

@@ -30,7 +30,6 @@ import com.todoroo.astrid.api.CaldavFilter;
 import com.todoroo.astrid.api.Filter;
 import com.todoroo.astrid.api.GtasksFilter;
 import com.todoroo.astrid.api.PermaSql;
-import com.todoroo.astrid.api.TagFilter;
 import com.todoroo.astrid.core.SortHelper;
 import com.todoroo.astrid.dao.TaskDao;
 import com.todoroo.astrid.dao.TaskDao.TaskCriteria;
@@ -86,6 +85,17 @@ public class TaskListViewModel extends ViewModel implements Observer<PagedList<T
   private static final Field PRIMARY_SORT = field("primary_sort").as("primarySort");
   private static final Field SECONDARY_SORT = field("secondary_sort").as("secondarySort");
   private static final Field INDENT = field("indent");
+  private static final Field TAG_QUERY =
+      field(
+              "("
+                  + Query.select(field("group_concat(distinct(tag_uid))"))
+                      .from(Tag.TABLE)
+                      .where(Task.ID.eq(Tag.TASK))
+                      .toString()
+                  + " GROUP BY "
+                  + Tag.TASK
+                  + ")")
+          .as("tags");
   private static final StringProperty TAGS =
       new StringProperty(null, "group_concat(distinct(" + TAGS_METADATA_JOIN + ".tag_uid)" + ")")
           .as("tags");
@@ -128,19 +138,7 @@ public class TaskListViewModel extends ViewModel implements Observer<PagedList<T
         && (includeGoogleTaskSubtasks || includeCaldavSubtasks)
         && preferences.showSubtasks()
         && !(preferences.isManualSort() && filter.supportsManualSort())) {
-      String tagQuery =
-          Query.select(field("group_concat(distinct(tag_uid))"))
-                  .from(Tag.TABLE)
-                  .where(
-                      filter instanceof TagFilter
-                          ? Criterion.and(
-                              Task.ID.eq(Tag.TASK),
-                              Tag.TAG_UID.neq(((TagFilter) filter).getUuid()))
-                          : Task.ID.eq(Tag.TASK))
-                  .toString()
-              + " GROUP BY "
-              + Tag.TASK;
-      fields.add(field("(" + tagQuery + ")").as("tags"));
+      fields.add(TAG_QUERY);
       fields.add(INDENT);
       fields.add(CHILDREN);
 
@@ -248,15 +246,9 @@ public class TaskListViewModel extends ViewModel implements Observer<PagedList<T
       // TODO: For now, we'll modify the query to join and include the things like tag data here.
       // Eventually, we might consider restructuring things so that this query is constructed
       // elsewhere.
-      Criterion tagsJoinCriterion =
-          filter instanceof TagFilter
-              ? Criterion.and(
-                  JOIN_TAGS,
-                  field(TAGS_METADATA_JOIN + ".tag_uid").neq(((TagFilter) filter).getUuid()))
-              : JOIN_TAGS;
 
       String joinedQuery =
-          Join.left(Tag.TABLE.as(TAGS_METADATA_JOIN), tagsJoinCriterion).toString()
+          Join.left(Tag.TABLE.as(TAGS_METADATA_JOIN), JOIN_TAGS).toString()
               + JOINS
               + filter.getSqlQuery();