transaction load: replace the list atomically

[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 10aa2e9bc62630949cf9df03607463bc12d306de..f2377c958022ed653a3158330877f5f197bb7d9a 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
@@ -18,7 +18,41 @@
 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 net.ktnx.mobileledger.model.LedgerTransaction;
+import net.ktnx.mobileledger.utils.MLDB;
+
+import java.util.ArrayList;
+import java.util.List;
 
 public class TransactionListViewModel extends ViewModel {
-    // TODO: Implement the ViewModel
+
+    private List<LedgerTransaction> transactions;
+
+    public List<LedgerTransaction> getTransactions(Context context) {
+        if (transactions == null) {
+            transactions = new ArrayList<>();
+            reloadTransactions(context);
+        }
+
+        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;
+            }
+        }
+
+    }
 }