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 com.android.gallery3d.data; 18 19import com.android.gallery3d.common.Utils; 20import com.android.gallery3d.util.ThreadPool.CancelListener; 21import com.android.gallery3d.util.ThreadPool.JobContext; 22 23import java.io.ByteArrayOutputStream; 24import java.io.File; 25import java.io.FileOutputStream; 26import java.io.IOException; 27import java.io.InputStream; 28import java.io.InterruptedIOException; 29import java.io.OutputStream; 30import java.net.URL; 31 32public class DownloadUtils { 33 private static final String TAG = "DownloadService"; 34 35 public static boolean requestDownload(JobContext jc, URL url, File file) { 36 FileOutputStream fos = null; 37 try { 38 fos = new FileOutputStream(file); 39 return download(jc, url, fos); 40 } catch (Throwable t) { 41 return false; 42 } finally { 43 Utils.closeSilently(fos); 44 } 45 } 46 47 public static byte[] requestDownload(JobContext jc, URL url) { 48 ByteArrayOutputStream baos = null; 49 try { 50 baos = new ByteArrayOutputStream(); 51 if (!download(jc, url, baos)) { 52 return null; 53 } 54 return baos.toByteArray(); 55 } catch (Throwable t) { 56 Log.w(TAG, t); 57 return null; 58 } finally { 59 Utils.closeSilently(baos); 60 } 61 } 62 63 public static void dump(JobContext jc, InputStream is, OutputStream os) 64 throws IOException { 65 byte buffer[] = new byte[4096]; 66 int rc = is.read(buffer, 0, buffer.length); 67 final Thread thread = Thread.currentThread(); 68 jc.setCancelListener(new CancelListener() { 69 public void onCancel() { 70 thread.interrupt(); 71 } 72 }); 73 while (rc > 0) { 74 if (jc.isCancelled()) throw new InterruptedIOException(); 75 os.write(buffer, 0, rc); 76 rc = is.read(buffer, 0, buffer.length); 77 } 78 jc.setCancelListener(null); 79 Thread.interrupted(); // consume the interrupt signal 80 } 81 82 public static boolean download(JobContext jc, URL url, OutputStream output) { 83 InputStream input = null; 84 try { 85 input = url.openStream(); 86 dump(jc, input, output); 87 return true; 88 } catch (Throwable t) { 89 Log.w(TAG, "fail to download", t); 90 return false; 91 } finally { 92 Utils.closeSilently(input); 93 } 94 } 95}