| /* |
| * Copyright (C) 2015 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 com.android.mtp; |
| |
| import android.os.ParcelFileDescriptor; |
| import android.util.Log; |
| |
| import java.io.IOException; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| |
| class PipeManager { |
| final ExecutorService mExecutor; |
| |
| PipeManager() { |
| this(Executors.newCachedThreadPool()); |
| } |
| |
| PipeManager(ExecutorService executor) { |
| this.mExecutor = executor; |
| } |
| |
| ParcelFileDescriptor readDocument(MtpManager model, Identifier identifier) throws IOException { |
| final Task task = new ImportFileTask(model, identifier); |
| mExecutor.execute(task); |
| return task.getReadingFileDescriptor(); |
| } |
| |
| ParcelFileDescriptor readThumbnail(MtpManager model, Identifier identifier) throws IOException { |
| final Task task = new GetThumbnailTask(model, identifier); |
| mExecutor.execute(task); |
| return task.getReadingFileDescriptor(); |
| } |
| |
| private static abstract class Task implements Runnable { |
| protected final MtpManager mModel; |
| protected final Identifier mIdentifier; |
| protected final ParcelFileDescriptor[] mDescriptors; |
| |
| Task(MtpManager model, Identifier identifier) throws IOException { |
| mModel = model; |
| mIdentifier = identifier; |
| mDescriptors = ParcelFileDescriptor.createReliablePipe(); |
| } |
| |
| ParcelFileDescriptor getReadingFileDescriptor() { |
| return mDescriptors[0]; |
| } |
| } |
| |
| private static class ImportFileTask extends Task { |
| ImportFileTask(MtpManager model, Identifier identifier) throws IOException { |
| super(model, identifier); |
| } |
| |
| @Override |
| public void run() { |
| try { |
| mModel.importFile( |
| mIdentifier.mDeviceId, mIdentifier.mObjectHandle, mDescriptors[1]); |
| mDescriptors[1].close(); |
| } catch (IOException error) { |
| try { |
| mDescriptors[1].closeWithError("Failed to stream a file."); |
| } catch (IOException closeError) { |
| Log.w(MtpDocumentsProvider.TAG, closeError.getMessage()); |
| } |
| } |
| } |
| } |
| |
| private static class GetThumbnailTask extends Task { |
| GetThumbnailTask(MtpManager model, Identifier identifier) throws IOException { |
| super(model, identifier); |
| } |
| |
| @Override |
| public void run() { |
| try { |
| try (final ParcelFileDescriptor.AutoCloseOutputStream stream = |
| new ParcelFileDescriptor.AutoCloseOutputStream(mDescriptors[1])) { |
| try { |
| stream.write(mModel.getThumbnail( |
| mIdentifier.mDeviceId, mIdentifier.mObjectHandle)); |
| } catch (IOException error) { |
| mDescriptors[1].closeWithError("Failed to stream a thumbnail."); |
| } |
| } |
| } catch (IOException closeError) { |
| Log.w(MtpDocumentsProvider.TAG, closeError.getMessage()); |
| } |
| } |
| } |
| |
| void close() { |
| mExecutor.shutdown(); |
| } |
| } |