1/*
2 * Copyright (C) 2011 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 com.android.volley.toolbox;
18
19import com.android.volley.Cache;
20import com.android.volley.NetworkResponse;
21import com.android.volley.Request;
22import com.android.volley.Response;
23
24import android.os.Handler;
25import android.os.Looper;
26
27/**
28 * A synthetic request used for clearing the cache.
29 */
30public class ClearCacheRequest extends Request<Object> {
31    private final Cache mCache;
32    private final Runnable mCallback;
33
34    /**
35     * Creates a synthetic request for clearing the cache.
36     * @param cache Cache to clear
37     * @param callback Callback to make on the main thread once the cache is clear,
38     * or null for none
39     */
40    public ClearCacheRequest(Cache cache, Runnable callback) {
41        super(null, null);
42        mCache = cache;
43        mCallback = callback;
44    }
45
46    @Override
47    public boolean isCanceled() {
48        // This is a little bit of a hack, but hey, why not.
49        mCache.clear();
50        if (mCallback != null) {
51            Handler handler = new Handler(Looper.getMainLooper());
52            handler.postAtFrontOfQueue(mCallback);
53        }
54        return true;
55    }
56
57    @Override
58    public Priority getPriority() {
59        return Priority.IMMEDIATE;
60    }
61
62    @Override
63    protected Response<Object> parseNetworkResponse(NetworkResponse response) {
64        return null;
65    }
66
67    @Override
68    protected void deliverResponse(Object response) {
69    }
70}
71