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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 com.android.printspooler;
     18 
     19 import android.os.AsyncTask;
     20 import android.os.Bundle;
     21 import android.os.ParcelFileDescriptor;
     22 import android.os.RemoteException;
     23 import android.print.ILayoutResultCallback;
     24 import android.print.IPrintDocumentAdapter;
     25 import android.print.IWriteResultCallback;
     26 import android.print.PageRange;
     27 import android.print.PrintAttributes;
     28 import android.util.Log;
     29 
     30 import libcore.io.IoUtils;
     31 
     32 import java.io.File;
     33 import java.io.FileInputStream;
     34 import java.io.FileOutputStream;
     35 import java.io.IOException;
     36 import java.io.InputStream;
     37 import java.io.OutputStream;
     38 
     39 /**
     40  * This class represents a remote print document adapter instance.
     41  */
     42 final class RemotePrintDocumentAdapter {
     43     private static final String LOG_TAG = "RemotePrintDocumentAdapter";
     44 
     45     private static final boolean DEBUG = false;
     46 
     47     private final IPrintDocumentAdapter mRemoteInterface;
     48 
     49     private final File mFile;
     50 
     51     public RemotePrintDocumentAdapter(IPrintDocumentAdapter printAdatper, File file) {
     52         mRemoteInterface = printAdatper;
     53         mFile = file;
     54     }
     55 
     56     public void start()  {
     57         if (DEBUG) {
     58             Log.i(LOG_TAG, "start()");
     59         }
     60         try {
     61             mRemoteInterface.start();
     62         } catch (RemoteException re) {
     63             Log.e(LOG_TAG, "Error calling start()", re);
     64         }
     65     }
     66 
     67     public void layout(PrintAttributes oldAttributes, PrintAttributes newAttributes,
     68             ILayoutResultCallback callback, Bundle metadata, int sequence) {
     69         if (DEBUG) {
     70             Log.i(LOG_TAG, "layout()");
     71         }
     72         try {
     73             mRemoteInterface.layout(oldAttributes, newAttributes, callback, metadata, sequence);
     74         } catch (RemoteException re) {
     75             Log.e(LOG_TAG, "Error calling layout()", re);
     76         }
     77     }
     78 
     79     public void write(final PageRange[] pages, final IWriteResultCallback callback,
     80             final int sequence) {
     81         if (DEBUG) {
     82             Log.i(LOG_TAG, "write()");
     83         }
     84         new AsyncTask<Void, Void, Void>() {
     85             @Override
     86             protected Void doInBackground(Void... params) {
     87                 InputStream in = null;
     88                 OutputStream out = null;
     89                 ParcelFileDescriptor source = null;
     90                 ParcelFileDescriptor sink = null;
     91                 try {
     92                     ParcelFileDescriptor[] pipe = ParcelFileDescriptor.createPipe();
     93                     source = pipe[0];
     94                     sink = pipe[1];
     95 
     96                     in = new FileInputStream(source.getFileDescriptor());
     97                     out = new FileOutputStream(mFile);
     98 
     99                     // Async call to initiate the other process writing the data.
    100                     mRemoteInterface.write(pages, sink, callback, sequence);
    101 
    102                     // Close the source. It is now held by the client.
    103                     sink.close();
    104                     sink = null;
    105 
    106                     // Read the data.
    107                     final byte[] buffer = new byte[8192];
    108                     while (true) {
    109                         final int readByteCount = in.read(buffer);
    110                         if (readByteCount < 0) {
    111                             break;
    112                         }
    113                         out.write(buffer, 0, readByteCount);
    114                     }
    115                 } catch (RemoteException re) {
    116                     Log.e(LOG_TAG, "Error calling write()", re);
    117                 } catch (IOException ioe) {
    118                     Log.e(LOG_TAG, "Error calling write()", ioe);
    119                 } finally {
    120                     IoUtils.closeQuietly(in);
    121                     IoUtils.closeQuietly(out);
    122                     IoUtils.closeQuietly(sink);
    123                     IoUtils.closeQuietly(source);
    124                 }
    125                 return null;
    126             }
    127         }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, (Void[]) null);
    128     }
    129 
    130     public void finish() {
    131         if (DEBUG) {
    132             Log.i(LOG_TAG, "finish()");
    133         }
    134         try {
    135             mRemoteInterface.finish();
    136         } catch (RemoteException re) {
    137             Log.e(LOG_TAG, "Error calling finish()", re);
    138         }
    139     }
    140 
    141     public void cancel() {
    142         if (DEBUG) {
    143             Log.i(LOG_TAG, "cancel()");
    144         }
    145         try {
    146             mRemoteInterface.cancel();
    147         } catch (RemoteException re) {
    148             Log.e(LOG_TAG, "Error calling cancel()", re);
    149         }
    150     }
    151 }
    152