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
17package android.print;
18
19import android.content.Context;
20import android.os.AsyncTask;
21import android.os.Bundle;
22import android.os.CancellationSignal;
23import android.os.CancellationSignal.OnCancelListener;
24import android.os.FileUtils;
25import android.os.OperationCanceledException;
26import android.os.ParcelFileDescriptor;
27import android.util.Log;
28
29import com.android.internal.R;
30
31import libcore.io.IoUtils;
32
33import java.io.File;
34import java.io.FileInputStream;
35import java.io.FileOutputStream;
36import java.io.IOException;
37import java.io.InputStream;
38import 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 */
49public 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, null, mCancellationSignal);
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