app/src/main/java/de/dhbwloe/campusapp/news/NewsManager.java

   1 package de.dhbwloe.campusapp.news;
   2
   3 import android.util.Base64;
   4 import android.util.Log;
   5
   6 import java.io.UnsupportedEncodingException;
   7 import java.net.URLEncoder;
   8 import java.text.DateFormat;
   9 import java.text.ParseException;
  10 import java.text.SimpleDateFormat;
  11 import java.util.ArrayList;
  12 import java.util.Date;
  13 import java.util.List;
  14 import java.util.Locale;
  15
  16 import de.dhbwloe.campusapp.CampusAppContext;
  17 import de.dhbwloe.campusapp.mensaplan.MensaplanManagerInterface;
  18 import de.dhbwloe.campusapp.network.XmlEntry;
  19 import de.dhbwloe.campusapp.network.XmlRequestHelper;
  20 import de.dhbwloe.campusapp.search.SearchIndices;
  21
  22 /**
  23  * Created by pk910 on 22.01.2016.
  24  */
  25 public class NewsManager extends XmlRequestHelper {
  26     private static final String[][] NEWS_SOURCES = {
  27         {"DHBW", "http://www.dhbw-loerrach.de/index.php?id=59&type=100"},
  28         {"STUV", "http://stuv-loerrach.de/feed"},
  29     };
  30
  31
  32     private CampusAppContext AppContext;
  33     private boolean bRequestRunning = false;
  34     private ArrayList<NewsManagerInterface> aCallbackInterfaces = new ArrayList<NewsManagerInterface>();
  35     private String[] source;
  36
  37     public NewsManager(CampusAppContext context, String source) {
  38         AppContext = context;
  39
  40         for(String[] src : NEWS_SOURCES) {
  41             if(src[0].equalsIgnoreCase(source)) {
  42                 this.source = src;
  43             }
  44         }
  45     }
  46
  47     public void performSynchronisation(NewsManagerInterface callback) {
  48         aCallbackInterfaces.add(callback);
  49         if(bRequestRunning || this.source == null)
  50             return;
  51
  52         bRequestRunning = true;
  53         requestXmlFromWeb(this.source[1], "channel", "item");
  54     }
  55
  56     private long getTimeFromDateString(String timestamp) {
  57         // Thu, 08 Oct 2015 08:00:34 +0000
  58         if(timestamp == null)
  59             return 0;
  60         DateFormat df = new SimpleDateFormat("E, dd MMM yyyy HH:mm:ss Z", Locale.ENGLISH);
  61         try {
  62             Date result =  df.parse(timestamp);
  63             return result.getTime()/1000;
  64         } catch (ParseException e) {
  65             return 0;
  66         }
  67     }
  68
  69     @Override
  70     protected void onXmlReceived(List<XmlEntry> entries) {
  71         ArrayList<SearchIndices> newIndices = new ArrayList<SearchIndices>();
  72
  73         Log.i("NMSync", "Received News XML");
  74         for(XmlEntry entry : entries) {
  75             Log.i("NMSync", "Parse News");
  76             XmlEntry centry;
  77
  78             centry = XmlEntry.FindXmlEntryByName(entry, "pubDate");
  79             long time = (centry == null ? 0 : getTimeFromDateString(centry.getValue()));
  80             if(time == 0)
  81                 continue;
  82
  83             centry = XmlEntry.FindXmlEntryByName(entry, "link");
  84             String link = (centry == null ? null : centry.getValue());
  85             centry = XmlEntry.FindXmlEntryByName(entry, "uuid");
  86             String uuid = (centry == null ? null : centry.getValue());
  87
  88             String uniqueid;
  89             if(uuid == null) {
  90                 if(link == null)
  91                     continue;
  92                 byte[] data = new byte[0];
  93                 try {
  94                     data = link.getBytes("UTF-8");
  95                 } catch (UnsupportedEncodingException e) {
  96                     continue;
  97                 }
  98                 uniqueid = Base64.encodeToString(data, Base64.DEFAULT);
  99             } else {
 100                 byte[] data = new byte[0];
 101                 try {
 102                     data = uuid.getBytes("UTF-8");
 103                 } catch (UnsupportedEncodingException e) {
 104                     continue;
 105                 }
 106                 uniqueid = Base64.encodeToString(data, Base64.DEFAULT);
 107             }
 108
 109             centry = XmlEntry.FindXmlEntryByName(entry, "title");
 110             String title = (centry == null ? null : centry.getValue());
 111
 112             centry = XmlEntry.FindXmlEntryByName(entry, "description");
 113             String summary = (centry == null ? null : centry.getValue());
 114
 115             centry = XmlEntry.FindXmlEntryByName(entry, "content");
 116             String content = (centry == null ? null : centry.getValue());
 117
 118             centry = XmlEntry.FindXmlEntryByName(entry, "creator");
 119             String creator = (centry == null ? null : centry.getValue());
 120             if(creator != null) {
 121                 if(content != null)
 122                     content = creator + ": " + content;
 123                 else
 124                     content = creator;
 125             }
 126
 127             StringBuilder categories = new StringBuilder();
 128             XmlEntry[] centries = XmlEntry.FindXmlEntriesByName(entry, "category");
 129             for(XmlEntry centry2 : centries) {
 130                 if(categories.length() > 0)
 131                     categories.append(",");
 132                 categories.append(centry2.getValue());
 133             }
 134
 135             NewsItem newsitem = new NewsItem(0, source[0], time, uniqueid, 0, title, summary, content, link, categories.toString());
 136             newsitem.calculateChkSum();
 137
 138             AppContext.getDatabaseManager().updateNewsItem(newsitem);
 139             if(newsitem.getIsNew(true)) {
 140                 SearchIndices indices = new SearchIndices("NewsItem#"+newsitem.getId(), false);
 141                 indices.setTarget("#News#shownews=" + newsitem.getId());
 142                 indices.setTitle(newsitem.getSource() + " News (" + newsitem.getFormatedDate() + ")");
 143                 indices.setDescription(newsitem.getTitle() + ": " + newsitem.getSummary());
 144                 indices.setUpdateTime(newsitem.getTime());
 145                 indices.addKeyWord(newsitem.getTitle());
 146                 indices.addKeyWord(newsitem.getSummary());
 147                 indices.addKeyWord(newsitem.getContent());
 148                 newIndices.add(indices);
 149             }
 150         }
 151
 152         SearchIndices[] newIndicesArr = new SearchIndices[newIndices.size()];
 153         newIndicesArr = newIndices.toArray(newIndicesArr);
 154         AppContext.addSearchIndices(newIndicesArr);
 155
 156         for(NewsManagerInterface callback : aCallbackInterfaces) {
 157             callback.onNewsUpdateDone();
 158         }
 159         aCallbackInterfaces.clear();
 160         bRequestRunning = false;
 161     }
 162
 163     @Override
 164     protected void onXmlRequestFail(int statusCode, String errorMessage) {
 165         for(NewsManagerInterface callback : aCallbackInterfaces) {
 166             callback.onNewsUpdateFail("error " + statusCode + ": " + errorMessage);
 167         }
 168         aCallbackInterfaces.clear();
 169         bRequestRunning = false;
 170     }
 171 }