1/*
2 *  Licensed to the Apache Software Foundation (ASF) under one or more
3 *  contributor license agreements.  See the NOTICE file distributed with
4 *  this work for additional information regarding copyright ownership.
5 *  The ASF licenses this file to You under the Apache License, Version 2.0
6 *  (the "License"); you may not use this file except in compliance with
7 *  the License.  You may obtain a copy of the License at
8 *
9 *     http://www.apache.org/licenses/LICENSE-2.0
10 *
11 *  Unless required by applicable law or agreed to in writing, software
12 *  distributed under the License is distributed on an "AS IS" BASIS,
13 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 *  See the License for the specific language governing permissions and
15 *  limitations under the License.
16 */
17/**
18 * @author Igor V. Stolyarov
19 * @version $Revision$
20 */
21
22package java.awt.image;
23
24import java.awt.BufferCapabilities;
25import java.awt.Graphics;
26
27/**
28 * The BufferStrategy abstract class provides an opportunity to organize the
29 * buffers for a Canvas or Window. The BufferStrategy implementation depends on
30 * hardware and software limitations. These limitations are detectable through
31 * the capabilities object which can be obtained by the GraphicsConfiguration of
32 * the Canvas or Window.
33 *
34 * @since Android 1.0
35 */
36public abstract class BufferStrategy {
37
38    /**
39     * Returns true if the drawing buffer was lost since the last call of
40     * getDrawGraphics.
41     *
42     * @return true if the drawing buffer was lost since the last call of
43     *         getDrawGraphics, false otherwise.
44     */
45    public abstract boolean contentsLost();
46
47    /**
48     * Returns true if the drawing buffer is restored from a lost state.
49     *
50     * @return true if the drawing buffer is restored from a lost state, false
51     *         otherwise.
52     */
53    public abstract boolean contentsRestored();
54
55    /**
56     * Gets the BufferCapabilities of BufferStrategy.
57     *
58     * @return the BufferCapabilities of BufferStrategy.
59     */
60    public abstract BufferCapabilities getCapabilities();
61
62    /**
63     * Gets the Graphics object to use to draw to the buffer.
64     *
65     * @return the Graphics object to use to draw to the buffer.
66     */
67    public abstract Graphics getDrawGraphics();
68
69    /**
70     * Shows the next available buffer.
71     */
72    public abstract void show();
73
74}
75