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