single observer instances, single place for reloading account/transaction lists

[mobile-ledger.git] / app / src / main / java / net / ktnx / mobileledger / ui / transaction_list / TransactionListViewModel.java

diff --git a/app/src/main/java/net/ktnx/mobileledger/ui/transaction_list/TransactionListViewModel.java b/app/src/main/java/net/ktnx/mobileledger/ui/transaction_list/TransactionListViewModel.java
index f2377c958022ed653a3158330877f5f197bb7d9a..9e7f77c537b8c1e50fea52a3c9467c33160aa22a 100644 (file)
--- a/app/src/main/java/net/ktnx/mobileledger/ui/transaction_list/TransactionListViewModel.java
+++ b/app/src/main/java/net/ktnx/mobileledger/ui/transaction_list/TransactionListViewModel.java
@@ -1,58 +1,56 @@
 /*
- * Copyright © 2018 Damyan Ivanov.
- * This file is part of Mobile-Ledger.
- * Mobile-Ledger is free software: you can distribute it and/or modify it
+ * Copyright © 2019 Damyan Ivanov.
+ * This file is part of MoLe.
+ * MoLe is free software: you can distribute it and/or modify it
  * under the term of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your opinion), any later version.
  *
- * Mobile-Ledger is distributed in the hope that it will be useful,
+ * MoLe is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  * GNU General Public License terms for details.
  *
  * You should have received a copy of the GNU General Public License
- * along with Mobile-Ledger. If not, see <https://www.gnu.org/licenses/>.
+ * along with MoLe. If not, see <https://www.gnu.org/licenses/>.
  */
 
 package net.ktnx.mobileledger.ui.transaction_list;
 
-import android.arch.lifecycle.ViewModel;
-import android.content.Context;
-import android.database.Cursor;
-import android.database.sqlite.SQLiteDatabase;
+import android.os.AsyncTask;
 
-import net.ktnx.mobileledger.model.LedgerTransaction;
-import net.ktnx.mobileledger.utils.MLDB;
+import net.ktnx.mobileledger.async.UpdateTransactionsTask;
+import net.ktnx.mobileledger.model.Data;
+import net.ktnx.mobileledger.model.TransactionListItem;
+import net.ktnx.mobileledger.utils.LockHolder;
+import net.ktnx.mobileledger.utils.ObservableValue;
 
-import java.util.ArrayList;
-import java.util.List;
+import androidx.lifecycle.ViewModel;
 
 public class TransactionListViewModel extends ViewModel {
+    public static ObservableValue<Boolean> updating = new ObservableValue<>();
+    public static ObservableValue<String> updateError = new ObservableValue<>();
 
-    private List<LedgerTransaction> transactions;
+    public static void scheduleTransactionListReload() {
+        if (Data.profile.get() == null) return;
 
-    public List<LedgerTransaction> getTransactions(Context context) {
-        if (transactions == null) {
-            transactions = new ArrayList<>();
-            reloadTransactions(context);
+        String filter = TransactionListFragment.accountFilter.get();
+        AsyncTask<String, Void, String> task = new UTT();
+        task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, filter);
+    }
+    public static TransactionListItem getTransactionListItem(int position) {
+        try(LockHolder lh = Data.transactions.lockForReading()) {
+            if (Data.transactions == null) return null;
+            if (position >= Data.transactions.size() + 1) return null;
+            if (position == Data.transactions.size()) return new TransactionListItem();
+            return Data.transactions.get(position);
         }
-
-        return transactions;
     }
-    public void reloadTransactions(Context context) {
-        ArrayList<LedgerTransaction> newList = new ArrayList<>();
-
-        String sql = "SELECT id FROM transactions ORDER BY date desc, id desc";
-
-        try (SQLiteDatabase db = MLDB.getReadableDatabase(context)) {
-            try (Cursor cursor = db.rawQuery(sql, null)) {
-                while (cursor.moveToNext()) {
-                    newList.add(new LedgerTransaction(cursor.getInt(0)));
-                }
-                transactions = newList;
-            }
+    private static class UTT extends UpdateTransactionsTask {
+        @Override
+        protected void onPostExecute(String error) {
+            super.onPostExecute(error);
+            if (error != null) updateError.set(error);
         }
-
     }
 }