1/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.database;
18
19/**
20 * Receives call backs when a data set has been changed, or made invalid. The typically data sets
21 * that are observed are {@link Cursor}s or {@link android.widget.Adapter}s.
22 * DataSetObserver must be implemented by objects which are added to a DataSetObservable.
23 */
24public abstract class DataSetObserver {
25    /**
26     * This method is called when the entire data set has changed,
27     * most likely through a call to {@link Cursor#requery()} on a {@link Cursor}.
28     */
29    public void onChanged() {
30        // Do nothing
31    }
32
33    /**
34     * This method is called when the entire data becomes invalid,
35     * most likely through a call to {@link Cursor#deactivate()} or {@link Cursor#close()} on a
36     * {@link Cursor}.
37     */
38    public void onInvalidated() {
39        // Do nothing
40    }
41}
42