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