| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package vogar.android; |
| |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.util.HashSet; |
| import java.util.Set; |
| import vogar.FileCache; |
| import vogar.Log; |
| import vogar.commands.Command; |
| |
| public class DeviceFileCache implements FileCache { |
| private final Log log; |
| private final File cacheRoot; |
| private DeviceFilesystem deviceFilesystem; |
| |
| /** filled lazily */ |
| private Set<File> cachedFiles; |
| |
| public DeviceFileCache(Log log, File deviceDir, DeviceFilesystem deviceFilesystem) { |
| this.log = log; |
| this.cacheRoot = new File(deviceDir, "md5-cache"); |
| this.deviceFilesystem = deviceFilesystem; |
| } |
| |
| @Override |
| public boolean existsInCache(String key) { |
| if (cachedFiles == null) { |
| try { |
| cachedFiles = new HashSet<File>(); |
| cachedFiles.addAll(deviceFilesystem.ls(cacheRoot)); |
| log.verbose("indexed on-device cache: " + cachedFiles.size() + " entries."); |
| } catch (FileNotFoundException e) { |
| // cacheRoot probably just hasn't been created yet. |
| cachedFiles = new HashSet<File>(); |
| } |
| } |
| File cachedFile = new File(cacheRoot, key); |
| return cachedFiles.contains(cachedFile); |
| } |
| |
| @Override |
| public void copyFromCache(String key, File destination) { |
| File cachedFile = new File(cacheRoot, key); |
| cp(cachedFile, destination); |
| } |
| |
| @Override |
| public void copyToCache(File source, String key) { |
| File cachedFile = new File(cacheRoot, key); |
| deviceFilesystem.mkdirs(cacheRoot); |
| // Copy it onto the same file system first, then atomically move it into place. |
| // That way, if we fail, we don't leave anything dangerous lying around. |
| File temporary = new File(cachedFile + ".tmp"); |
| cp(source, temporary); |
| mv(cachedFile, temporary); |
| } |
| |
| private void mv(File cachedFile, File temporary) { |
| new Command(log, "adb", "shell", "mv", temporary.getPath(), cachedFile.getPath()).execute(); |
| } |
| |
| private void cp(File source, File temporary) { |
| // adb doesn't support "cp" command directly |
| new Command(log, "adb", "shell", "cat", source.getPath(), ">", temporary.getPath()) |
| .execute(); |
| } |
| } |