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      1 /*
      2  * Copyright (C) 2013 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 
     17 package android.print;
     18 
     19 import android.content.Context;
     20 import android.os.AsyncTask;
     21 import android.os.Bundle;
     22 import android.os.CancellationSignal;
     23 import android.os.CancellationSignal.OnCancelListener;
     24 import android.os.ParcelFileDescriptor;
     25 import android.util.Log;
     26 
     27 import com.android.internal.R;
     28 
     29 import libcore.io.IoUtils;
     30 
     31 import java.io.File;
     32 import java.io.FileInputStream;
     33 import java.io.FileOutputStream;
     34 import java.io.IOException;
     35 import java.io.InputStream;
     36 import java.io.OutputStream;
     37 
     38 /**
     39  * Adapter for printing PDF files. This class could be useful if you
     40  * want to print a file and intercept when the system is ready
     41  * spooling the data, so you can delete the file if it is a
     42  * temporary one. To achieve this one must override {@link #onFinish()}
     43  * and delete the file yourself.
     44  *
     45  * @hide
     46  */
     47 public class PrintFileDocumentAdapter extends PrintDocumentAdapter {
     48 
     49     private static final String LOG_TAG = "PrintedFileDocumentAdapter";
     50 
     51     private final Context mContext;
     52 
     53     private final File mFile;
     54 
     55     private final PrintDocumentInfo mDocumentInfo;
     56 
     57     private WriteFileAsyncTask mWriteFileAsyncTask;
     58 
     59     /**
     60      * Constructor.
     61      *
     62      * @param context Context for accessing resources.
     63      * @param file The PDF file to print.
     64      * @param documentInfo The information about the printed file.
     65      */
     66     public PrintFileDocumentAdapter(Context context, File file,
     67             PrintDocumentInfo documentInfo) {
     68         if (file == null) {
     69             throw new IllegalArgumentException("File cannot be null!");
     70         }
     71         if (documentInfo == null) {
     72             throw new IllegalArgumentException("documentInfo cannot be null!");
     73         }
     74         mContext = context;
     75         mFile = file;
     76         mDocumentInfo = documentInfo;
     77     }
     78 
     79     @Override
     80     public void onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes,
     81             CancellationSignal cancellationSignal, LayoutResultCallback callback,
     82             Bundle metadata) {
     83         callback.onLayoutFinished(mDocumentInfo, false);
     84     }
     85 
     86     @Override
     87     public void onWrite(PageRange[] pages, ParcelFileDescriptor destination,
     88             CancellationSignal cancellationSignal, WriteResultCallback callback) {
     89         mWriteFileAsyncTask = new WriteFileAsyncTask(destination, cancellationSignal, callback);
     90         mWriteFileAsyncTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR,
     91                 (Void[]) null);
     92     }
     93 
     94     private final class WriteFileAsyncTask extends AsyncTask<Void, Void, Void> {
     95 
     96         private final ParcelFileDescriptor mDestination;
     97 
     98         private final WriteResultCallback mResultCallback;
     99 
    100         private final CancellationSignal mCancellationSignal;
    101 
    102         public WriteFileAsyncTask(ParcelFileDescriptor destination,
    103                 CancellationSignal cancellationSignal, WriteResultCallback callback) {
    104             mDestination = destination;
    105             mResultCallback = callback;
    106             mCancellationSignal = cancellationSignal;
    107             mCancellationSignal.setOnCancelListener(new OnCancelListener() {
    108                 @Override
    109                 public void onCancel() {
    110                     cancel(true);
    111                 }
    112             });
    113         }
    114 
    115         @Override
    116         protected Void doInBackground(Void... params) {
    117             InputStream in = null;
    118             OutputStream out = new FileOutputStream(mDestination.getFileDescriptor());
    119             final byte[] buffer = new byte[8192];
    120             try {
    121                 in = new FileInputStream(mFile);
    122                 while (true) {
    123                     if (isCancelled()) {
    124                         break;
    125                     }
    126                     final int readByteCount = in.read(buffer);
    127                     if (readByteCount < 0) {
    128                         break;
    129                     }
    130                     out.write(buffer, 0, readByteCount);
    131                 }
    132              } catch (IOException ioe) {
    133                  Log.e(LOG_TAG, "Error writing data!", ioe);
    134                  mResultCallback.onWriteFailed(mContext.getString(
    135                          R.string.write_fail_reason_cannot_write));
    136              } finally {
    137                 IoUtils.closeQuietly(in);
    138                 IoUtils.closeQuietly(out);
    139             }
    140             return null;
    141         }
    142 
    143         @Override
    144         protected void onPostExecute(Void result) {
    145             mResultCallback.onWriteFinished(new PageRange[] {PageRange.ALL_PAGES});
    146         }
    147 
    148         @Override
    149         protected void onCancelled(Void result) {
    150             mResultCallback.onWriteFailed(mContext.getString(
    151                     R.string.write_fail_reason_cancelled));
    152         }
    153     }
    154 }
    155 
    156