1/*
2 * Copyright (C) 2010 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.service.urlrenderer;
18
19import android.annotation.SdkConstant;
20import android.annotation.SdkConstant.SdkConstantType;
21import android.app.Service;
22import android.os.ParcelFileDescriptor;
23import android.os.RemoteException;
24
25import java.util.List;
26
27/**
28 * TODO(phanna): Complete documentation.
29 * {@hide} while developing
30 */
31public abstract class UrlRendererService extends Service {
32    /**
33     * The {@link Intent} that must be declared as handled by the service.
34     */
35    @SdkConstant(SdkConstantType.SERVICE_ACTION)
36    public static final String SERVICE_INTERFACE =
37            "android.service.urlrenderer.UrlRendererService";
38
39    static final String TAG = "UrlRendererService";
40
41    private static class InternalCallback implements UrlRenderer.Callback {
42        private final IUrlRendererCallback mCallback;
43        InternalCallback(IUrlRendererCallback cb) {
44            mCallback = cb;
45        }
46
47        public void complete(String url, ParcelFileDescriptor result) {
48            try {
49                mCallback.complete(url, result);
50            } catch (RemoteException ex) {
51            }
52        }
53    }
54
55    private final IUrlRendererService.Stub mBinderInterface =
56            new IUrlRendererService.Stub() {
57                public void render(List<String> urls, int width, int height,
58                        IUrlRendererCallback cb) {
59                    processRequest(urls, width, height,
60                            new InternalCallback(cb));
61                }
62            };
63
64    /**
65     * Implement to return the implementation of the internal accessibility
66     * service interface.  Subclasses should not override.
67     */
68    @Override
69    public final android.os.IBinder onBind(android.content.Intent intent) {
70        return mBinderInterface;
71    }
72
73    /**
74     * When all clients unbind from the service, stop the service.  Subclasses
75     * should not override.
76     */
77    @Override
78    public final boolean onUnbind(android.content.Intent intent) {
79        stopSelf();
80        return false;
81    }
82
83    /**
84     * Subclasses implement this function to process the given urls.  When each
85     * url is complete, the subclass must invoke the callback with the result.
86     * @param urls  A list of urls to render at the given dimensions.
87     * @param width  The desired width of the result.
88     * @param height  The desired height of the result.
89     * @param cb  The callback to invoke when each url is complete.
90     */
91    public abstract void processRequest(List<String> urls, int width,
92            int height, UrlRenderer.Callback cb);
93}
94