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      */
PrintFileDocumentAdapter(Context context, File file, PrintDocumentInfo documentInfo)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
onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes, CancellationSignal cancellationSignal, LayoutResultCallback callback, Bundle metadata)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
onWrite(PageRange[] pages, ParcelFileDescriptor destination, CancellationSignal cancellationSignal, WriteResultCallback callback)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 
WriteFileAsyncTask(ParcelFileDescriptor destination, CancellationSignal cancellationSignal, WriteResultCallback callback)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
doInBackground(Void... params)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
onPostExecute(Void result)133         protected void onPostExecute(Void result) {
134             mResultCallback.onWriteFinished(new PageRange[] {PageRange.ALL_PAGES});
135         }
136 
137         @Override
onCancelled(Void result)138         protected void onCancelled(Void result) {
139             mResultCallback.onWriteFailed(mContext.getString(
140                     R.string.write_fail_reason_cancelled));
141         }
142     }
143 }
144 
145