tim/prune/load/xml/GzipFileLoader.java

   1 package tim.prune.load.xml;
   2
   3 import java.io.File;
   4 import java.io.FileInputStream;
   5 import java.util.zip.GZIPInputStream;
   6 import javax.xml.parsers.SAXParser;
   7 import javax.xml.parsers.SAXParserFactory;
   8 import tim.prune.App;
   9 import tim.prune.I18nManager;
  10 import tim.prune.data.Altitude;
  11 import tim.prune.data.SourceInfo;
  12 import tim.prune.load.MediaLinkInfo;
  13
  14 /**
  15  * Class to handle the loading of gzipped xml files
  16  */
  17 public class GzipFileLoader
  18 {
  19         /** App for callback of file loading */
  20         private App _app = null;
  21         /** Object to do the handling of the xml */
  22         XmlFileLoader _xmlLoader = null;
  23
  24         /**
  25          * Constructor
  26          * @param inApp App object
  27          * @param inXmlLoader object to do the xml handling
  28          */
  29         public GzipFileLoader(App inApp, XmlFileLoader inXmlLoader)
  30         {
  31                 _app = inApp;
  32                 _xmlLoader = inXmlLoader;
  33         }
  34
  35         /**
  36          * Open the selected file and select appropriate xml loader
  37          * @param inFile File to open
  38          */
  39         public void openFile(File inFile)
  40         {
  41                 GZIPInputStream istream = null;
  42                 try
  43                 {
  44                         istream = new GZIPInputStream(new FileInputStream(inFile));
  45                         _xmlLoader.reset();
  46                         SAXParser saxParser = SAXParserFactory.newInstance().newSAXParser();
  47                         saxParser.parse(istream, _xmlLoader);
  48                         XmlHandler handler = _xmlLoader.getHandler();
  49                         if (handler == null) {
  50                                 _app.showErrorMessage("error.load.dialogtitle", "error.load.noread");
  51                         }
  52                         else
  53                         {
  54                                 // Send back to app
  55                                 SourceInfo sourceInfo = new SourceInfo(inFile,
  56                                         (handler instanceof GpxHandler?SourceInfo.FILE_TYPE.GPX:SourceInfo.FILE_TYPE.KML));
  57                                 _app.informDataLoaded(handler.getFieldArray(), handler.getDataArray(),
  58                                         Altitude.Format.METRES, sourceInfo, handler.getTrackNameList(),
  59                                         new MediaLinkInfo(inFile, handler.getLinkArray()));
  60                         }
  61                 }
  62                 catch (Exception e)
  63                 {
  64                         // Error occurred, could be a non-xml file borking the parser
  65                         _app.showErrorMessageNoLookup("error.load.dialogtitle",
  66                                 I18nManager.getText("error.load.othererror") + " " + e.getClass().getName());
  67                         // It would be nice to verify the filename of the file inside the gz,
  68                         // but the java classes don't give access to this information
  69                 }
  70                 finally {
  71                         try {
  72                                 istream.close();
  73                         }
  74                         catch (Exception e2) {}
  75                 }
  76         }
  77 }