| /* |
| * Copyright (C) 2013 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 android.print; |
| |
| import android.content.Context; |
| import android.os.AsyncTask; |
| import android.os.CancellationSignal; |
| import android.os.CancellationSignal.OnCancelListener; |
| import android.util.Log; |
| |
| import com.android.internal.R; |
| |
| import libcore.io.IoUtils; |
| |
| import java.io.File; |
| import java.io.FileDescriptor; |
| import java.io.FileInputStream; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Adapter for printing files. |
| */ |
| final class FileDocumentAdapter extends PrintDocumentAdapter { |
| |
| private static final String LOG_TAG = "FileDocumentAdapter"; |
| |
| private final Context mContext; |
| |
| private final File mFile; |
| |
| private WriteFileAsyncTask mWriteFileAsyncTask; |
| |
| public FileDocumentAdapter(Context context, File file) { |
| if (file == null) { |
| throw new IllegalArgumentException("File cannot be null!"); |
| } |
| mContext = context; |
| mFile = file; |
| } |
| |
| @Override |
| public void onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes, |
| CancellationSignal cancellationSignal, LayoutResultCallback callback) { |
| // TODO: When we have a PDF rendering library we should query the page count. |
| PrintDocumentInfo info = new PrintDocumentInfo.Builder() |
| .setPageCount(PrintDocumentInfo.PAGE_COUNT_UNKNOWN).create(); |
| callback.onLayoutFinished(info, false); |
| } |
| |
| @Override |
| public void onWrite(List<PageRange> pages, FileDescriptor destination, |
| CancellationSignal cancellationSignal, WriteResultCallback callback) { |
| mWriteFileAsyncTask = new WriteFileAsyncTask(destination, cancellationSignal, callback); |
| mWriteFileAsyncTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, |
| (Void[]) null); |
| } |
| |
| private final class WriteFileAsyncTask extends AsyncTask<Void, Void, Void> { |
| |
| private final FileDescriptor mDestination; |
| |
| private final WriteResultCallback mResultCallback; |
| |
| private final CancellationSignal mCancellationSignal; |
| |
| public WriteFileAsyncTask(FileDescriptor destination, |
| CancellationSignal cancellationSignal, WriteResultCallback callback) { |
| mDestination = destination; |
| mResultCallback = callback; |
| mCancellationSignal = cancellationSignal; |
| mCancellationSignal.setOnCancelListener(new OnCancelListener() { |
| @Override |
| public void onCancel() { |
| cancel(true); |
| } |
| }); |
| } |
| |
| @Override |
| protected Void doInBackground(Void... params) { |
| InputStream in = null; |
| OutputStream out = new FileOutputStream(mDestination); |
| final byte[] buffer = new byte[8192]; |
| try { |
| in = new FileInputStream(mFile); |
| while (true) { |
| if (isCancelled()) { |
| break; |
| } |
| final int readByteCount = in.read(buffer); |
| if (readByteCount < 0) { |
| break; |
| } |
| out.write(buffer, 0, readByteCount); |
| } |
| } catch (IOException ioe) { |
| Log.e(LOG_TAG, "Error writing data!", ioe); |
| mResultCallback.onWriteFailed(mContext.getString( |
| R.string.write_fail_reason_cannot_write)); |
| } finally { |
| IoUtils.closeQuietly(in); |
| IoUtils.closeQuietly(out); |
| } |
| return null; |
| } |
| |
| @Override |
| protected void onPostExecute(Void result) { |
| List<PageRange> pages = new ArrayList<PageRange>(); |
| pages.add(PageRange.ALL_PAGES); |
| mResultCallback.onWriteFinished(pages); |
| } |
| |
| @Override |
| protected void onCancelled(Void result) { |
| mResultCallback.onWriteFailed(mContext.getString( |
| R.string.write_fail_reason_cancelled)); |
| } |
| } |
| } |
| |