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.ParcelFileDescriptor;
25import android.util.Log;
26
27import com.android.internal.R;
28
29import libcore.io.IoUtils;
30
31import java.io.File;
32import java.io.FileInputStream;
33import java.io.FileOutputStream;
34import java.io.IOException;
35import java.io.InputStream;
36import 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 */
47public 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