Android/folioreader/src/main/java/com/folioreader/ui/base/ManifestTask.java

   1 package com.folioreader.ui.base;
   2
   3 import android.os.AsyncTask;
   4 import android.util.Log;
   5
   6 import com.fasterxml.jackson.databind.ObjectMapper;
   7 import com.folioreader.util.AppUtil;
   8
   9 import org.readium.r2_streamer.model.publication.EpubPublication;
  10 import org.readium.r2_streamer.model.tableofcontents.TOCLink;
  11
  12 import java.io.BufferedReader;
  13 import java.io.IOException;
  14 import java.io.InputStream;
  15 import java.io.InputStreamReader;
  16 import java.net.URL;
  17 import java.net.URLConnection;
  18
  19 /**
  20  * Background async task which makes API call to get Epub publication
  21  * manifest from server
  22  *
  23  * @author by gautam on 12/6/17.
  24  */
  25
  26 public class ManifestTask extends AsyncTask<String, Void, EpubPublication> {
  27
  28     private static final String TAG = "ManifestTask";
  29
  30     private ManifestCallBack manifestCallBack;
  31
  32     public ManifestTask(ManifestCallBack manifestCallBack) {
  33         this.manifestCallBack = manifestCallBack;
  34     }
  35
  36     @Override
  37     protected EpubPublication doInBackground(String... urls) {
  38         String strUrl = urls[0];
  39
  40         try {
  41             URL url = new URL(strUrl);
  42             URLConnection urlConnection = url.openConnection();
  43             InputStream inputStream = urlConnection.getInputStream();
  44             BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, AppUtil.charsetNameForURLConnection(urlConnection)));
  45             StringBuilder stringBuilder = new StringBuilder();
  46             String line;
  47             while ((line = bufferedReader.readLine()) != null) {
  48                 stringBuilder.append(line);
  49             }
  50
  51             ObjectMapper objectMapper = new ObjectMapper();
  52             return objectMapper.readValue(stringBuilder.toString(), EpubPublication.class);
  53         } catch (IOException e) {
  54             Log.e(TAG, "ManifestTask failed", e);
  55         }
  56         return null;
  57     }
  58
  59     @Override
  60     protected void onPostExecute(EpubPublication publication) {
  61         if (publication != null) {
  62             //TODO can be implemented in r2-streamer?
  63             if (publication.tableOfContents != null) {
  64                 for (TOCLink link : publication.tableOfContents) {
  65                     setBookTitle(link, publication);
  66                 }
  67             }
  68             manifestCallBack.onReceivePublication(publication);
  69         } else {
  70             manifestCallBack.onError();
  71         }
  72         cancel(true);
  73     }
  74
  75     private void setBookTitle(TOCLink link, EpubPublication publication) {
  76         for (int i = 0; i < publication.spines.size(); i++) {
  77             if (publication.spines.get(i).href.equals(link.href)) {
  78                 publication.spines.get(i).bookTitle = link.bookTitle;
  79                 return;
  80             }
  81         }
  82     }
  83 }