WIP: db refactoring

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/database/LockHandler.java

@@ -0,0 +1,77 @@
+package nodomain.freeyourgadget.gadgetbridge.database;
+
+import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteOpenHelper;
+
+import java.util.List;
+
+import nodomain.freeyourgadget.gadgetbridge.devices.SampleProvider;
+import nodomain.freeyourgadget.gadgetbridge.entities.AbstractActivitySample;
+import nodomain.freeyourgadget.gadgetbridge.model.ActivitySample;
+
+/**
+ * A dummy DBHandler that does nothing more than implementing the release() method.
+ * It is solely used for locking concurrent access to the database session.
+ */
+public class LockHandler implements DBHandler {
+
+    @Override
+    public void release() {
+
+    }
+
+    @Override
+    public void close() {
+
+    }
+
+    @Override
+    public SQLiteOpenHelper getHelper() {
+        return null;
+    }
+
+    @Override
+    public List<ActivitySample> getAllActivitySamples(int tsFrom, int tsTo, SampleProvider provider) {
+        return null;
+    }
+
+    @Override
+    public List<ActivitySample> getActivitySamples(int tsFrom, int tsTo, SampleProvider provider) {
+        return null;
+    }
+
+    @Override
+    public List<ActivitySample> getSleepSamples(int tsFrom, int tsTo, SampleProvider provider) {
+        return null;
+    }
+
+    @Override
+    public void addGBActivitySample(AbstractActivitySample sample) {
+
+    }
+
+    @Override
+    public void addGBActivitySamples(AbstractActivitySample[] activitySamples) {
+
+    }
+
+    @Override
+    public SQLiteDatabase getWritableDatabase() {
+        return null;
+    }
+
+    @Override
+    public void changeStoredSamplesType(int timestampFrom, int timestampTo, int kind, SampleProvider provider) {
+
+    }
+
+    @Override
+    public void changeStoredSamplesType(int timestampFrom, int timestampTo, int fromKind, int toKind, SampleProvider provider) {
+
+    }
+
+    @Override
+    public int fetchLatestTimestamp(SampleProvider provider) {
+        return 0;
+    }
+}