Version 3, August 2007

[GpsPrune.git] / tim / prune / load / xml / XmlFileLoader.java

diff --git a/tim/prune/load/xml/XmlFileLoader.java b/tim/prune/load/xml/XmlFileLoader.java
new file mode 100644 (file)
index 0000000..a607b22
--- /dev/null
+++ b/tim/prune/load/xml/XmlFileLoader.java
@@ -0,0 +1,148 @@
+package tim.prune.load.xml;
+
+import java.io.File;
+import javax.swing.JFrame;
+import javax.swing.JOptionPane;
+import javax.xml.parsers.SAXParser;
+import javax.xml.parsers.SAXParserFactory;
+
+import org.xml.sax.Attributes;
+import org.xml.sax.SAXException;
+import org.xml.sax.helpers.DefaultHandler;
+import tim.prune.App;
+import tim.prune.I18nManager;
+import tim.prune.data.Altitude;
+
+/**
+ * Class for handling loading of Xml files, and passing the
+ * loaded data back to the App object
+ */
+public class XmlFileLoader extends DefaultHandler implements Runnable
+{
+       private File _file = null;
+       private App _app = null;
+       private JFrame _parentFrame = null;
+       private XmlHandler _handler = null;
+       private String _unknownType = null;
+
+
+       /**
+        * Constructor
+        * @param inApp Application object to inform of track load
+        * @param inParentFrame parent frame to reference for dialogs
+        */
+       public XmlFileLoader(App inApp, JFrame inParentFrame)
+       {
+               _app = inApp;
+               _parentFrame = inParentFrame;
+       }
+
+
+       /**
+        * Open the selected file and show the GUI dialog
+        * to select load options
+        */
+       public void openFile(File inFile)
+       {
+               _file = inFile;
+               _handler = null;
+               _unknownType = null;
+               // start new thread in case xml parsing is time-consuming
+               new Thread(this).start();
+       }
+
+
+       /**
+        * Run method, to parse the file
+        * @see java.lang.Runnable#run()
+        */
+       public void run()
+       {
+               try
+               {
+                       // Construct a SAXParser and use this as a default handler
+                       SAXParser saxParser = SAXParserFactory.newInstance().newSAXParser();
+                       saxParser.parse(_file, this);
+
+                       // Check whether handler was properly instantiated
+                       if (_handler == null)
+                       {
+                               // Wasn't either kml or gpx
+                               JOptionPane.showMessageDialog(_parentFrame,
+                                       I18nManager.getText("error.load.unknownxml") + " " + _unknownType,
+                                       I18nManager.getText("error.load.dialogtitle"), JOptionPane.ERROR_MESSAGE);
+                       }
+                       else
+                       {
+                               // Pass information back to app
+                               _app.informDataLoaded(_handler.getFieldArray(), _handler.getDataArray(),
+                                       Altitude.FORMAT_METRES, _file.getName());
+                       }
+               }
+               catch (Exception e)
+               {
+                       // Show error dialog
+                       JOptionPane.showMessageDialog(_parentFrame,
+                               I18nManager.getText("error.load.othererror") + " " + e.getMessage(),
+                               I18nManager.getText("error.load.dialogtitle"), JOptionPane.ERROR_MESSAGE);
+               }
+       }
+
+
+       /**
+        * Receive a tag
+        * @see org.xml.sax.ContentHandler#startElement(java.lang.String, java.lang.String, java.lang.String, org.xml.sax.Attributes)
+        */
+       public void startElement(String uri, String localName, String qName,
+                       Attributes attributes) throws SAXException
+       {
+               // Check for "kml" or "gpx" tags
+               if (_handler == null)
+               {
+                       if (qName.equals("kml")) {_handler = new KmlHandler();}
+                       else if (qName.equals("gpx")) {_handler = new GpxHandler();}
+                       else if (_unknownType == null && qName != null && !qName.equals(""))
+                       {
+                               _unknownType = qName;
+                       }
+               }
+               else
+               {
+                       // Handler instantiated so pass tags on to it
+                       _handler.startElement(uri, localName, qName, attributes);
+               }
+               super.startElement(uri, localName, qName, attributes);
+       }
+
+
+       /**
+        * Receive characters, either between or inside tags
+        * @see org.xml.sax.ContentHandler#characters(char[], int, int)
+        */
+       public void characters(char[] ch, int start, int length)
+                       throws SAXException
+       {
+               if (_handler != null)
+               {
+                       // Handler instantiated so pass tags on to it
+                       _handler.characters(ch, start, length);
+               }
+               super.characters(ch, start, length);
+       }
+
+
+       /**
+        * Receive end of element
+        * @see org.xml.sax.ContentHandler#endElement(java.lang.String, java.lang.String, java.lang.String)
+        */
+       public void endElement(String uri, String localName, String qName)
+                       throws SAXException
+       {
+               if (_handler != null)
+               {
+                       // Handler instantiated so pass tags on to it
+                       _handler.endElement(uri, localName, qName);
+               }
+               super.endElement(uri, localName, qName);
+       }
+}