Improve repo adapter

app/src/main/java/com/topjohnwu/magisk/adapters/ReposAdapter.java

@@ -15,6 +15,7 @@ import android.widget.TextView;
 
 import androidx.recyclerview.widget.RecyclerView;
 
+import com.topjohnwu.magisk.App;
 import com.topjohnwu.magisk.ClassMap;
 import com.topjohnwu.magisk.R;
 import com.topjohnwu.magisk.components.BaseActivity;
@@ -32,6 +33,7 @@ import java.util.List;
 import java.util.Map;
 
 import butterknife.BindView;
+import java9.util.stream.StreamSupport;
 
 public class ReposAdapter
         extends SectionedAdapter<ReposAdapter.SectionHolder, ReposAdapter.RepoHolder>
@@ -41,18 +43,19 @@ public class ReposAdapter
     private static final int INSTALLED = 1;
     private static final int OTHERS = 2;
 
-    private Cursor repoCursor = null;
     private Map<String, Module> moduleMap;
     private RepoDatabaseHelper repoDB;
     private List<Pair<Integer, List<Repo>>> repoPairs;
+    private List<Repo> fullList;
+    private SearchView mSearch;
 
-    public ReposAdapter(RepoDatabaseHelper db) {
+    public ReposAdapter() {
-        repoDB = db;
+        repoDB = App.self.repoDB;
         moduleMap = Collections.emptyMap();
+        fullList = Collections.emptyList();
         repoPairs = new ArrayList<>();
     }
 
-
     @Override
     public int getSectionCount() {
         return repoPairs.size();
@@ -136,17 +139,36 @@ public class ReposAdapter
         });
     }
 
-    public void notifyDBChanged() {
+    private void updateLists() {
-        if (repoCursor != null)
+        if (mSearch != null)
-            repoCursor.close();
+            onQueryTextChange(mSearch.getQuery().toString());
-        repoCursor = repoDB.getRepoCursor();
+        else
             onQueryTextChange("");
     }
 
+    private static boolean noCaseContain(String a, String b) {
+        return a.toLowerCase().contains(b.toLowerCase());
+    }
+
+    public void setSearchView(SearchView view) {
+        mSearch = view;
+        mSearch.setOnQueryTextListener(this);
+    }
+
+    public void notifyDBChanged(boolean refresh) {
+        try (Cursor c = repoDB.getRepoCursor()) {
+            fullList = new ArrayList<>(c.getCount());
+            while (c.moveToNext())
+                fullList.add(new Repo(c));
+        }
+        if (refresh)
+            updateLists();
+    }
+
     @Override
     public void onEvent(int event) {
         moduleMap = Event.getResult(event);
-        notifyDataSetChanged();
+        updateLists();
     }
 
     @Override
@@ -165,14 +187,11 @@ public class ReposAdapter
         List<Repo> installed = new ArrayList<>();
         List<Repo> others = new ArrayList<>();
 
-        repoPairs.clear();
+        StreamSupport.stream(fullList)
-        while (repoCursor.moveToNext()) {
+                .filter(repo -> noCaseContain(repo.getName(), s)
-            Repo repo = new Repo(repoCursor);
+                        || noCaseContain(repo.getAuthor(), s)
-            if (repo.getName().toLowerCase().contains(s.toLowerCase())
+                        || noCaseContain(repo.getDescription(), s))
-                    || repo.getAuthor().toLowerCase().contains(s.toLowerCase())
+                .forEach(repo -> {
-                    || repo.getDescription().toLowerCase().contains(s.toLowerCase())
-            ) {
-                // Passed the repoFilter
                     Module module = moduleMap.get(repo.getId());
                     if (module != null) {
                         if (repo.getVersionCode() > module.getVersionCode()) {
@@ -184,10 +203,9 @@ public class ReposAdapter
                     } else {
                         others.add(repo);
                     }
-            }
+                });
-        }
-        repoCursor.moveToFirst();
 
+        repoPairs.clear();
         if (!updates.isEmpty())
             repoPairs.add(new Pair<>(UPDATES, updates));
         if (!installed.isEmpty())

app/src/main/java/com/topjohnwu/magisk/fragments/ReposFragment.java

@@ -48,8 +48,7 @@ public class ReposFragment extends BaseFragment {
         mSwipeRefreshLayout.setRefreshing(true);
         mSwipeRefreshLayout.setOnRefreshListener(() -> new UpdateRepos().exec(true));
 
-        adapter = new ReposAdapter(app.repoDB);
+        adapter = new ReposAdapter();
-        Event.register(adapter);
         recyclerView.setAdapter(adapter);
         recyclerView.setVisibility(View.GONE);
 
@@ -71,7 +70,8 @@ public class ReposFragment extends BaseFragment {
 
     @Override
     public void onEvent(int event) {
-        adapter.notifyDBChanged();
+        adapter.notifyDBChanged(false);
+        Event.register(adapter);
         mSwipeRefreshLayout.setRefreshing(false);
         boolean empty = adapter.getItemCount() == 0;
         recyclerView.setVisibility(empty ? View.GONE : View.VISIBLE);
@@ -82,7 +82,7 @@ public class ReposFragment extends BaseFragment {
     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
         inflater.inflate(R.menu.menu_repo, menu);
         SearchView search = (SearchView) menu.findItem(R.id.repo_search).getActionView();
-        search.setOnQueryTextListener(adapter);
+        adapter.setSearchView(search);
     }
 
     @Override
@@ -93,7 +93,7 @@ public class ReposFragment extends BaseFragment {
                 .setSingleChoiceItems(R.array.sorting_orders,
                         Config.get(Config.Key.REPO_ORDER), (d, which) -> {
                     Config.set(Config.Key.REPO_ORDER, which);
-                    adapter.notifyDBChanged();
+                    adapter.notifyDBChanged(true);
                     d.dismiss();
                 }).show();
         }