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