gov/nasa/worldwind/examples/WMSLayers.java

   1 /*
   2 Copyright (C) 2001, 2006 United States Government
   3 as represented by the Administrator of the
   4 National Aeronautics and Space Administration.
   5 All Rights Reserved.
   6 */
   7 package gov.nasa.worldwind.examples;
   8
   9 import gov.nasa.worldwind.*;
  10 import gov.nasa.worldwind.layers.*;
  11 import gov.nasa.worldwind.wms.*;
  12 import org.w3c.dom.*;
  13 import org.xml.sax.*;
  14
  15 import javax.xml.parsers.*;
  16 import java.io.*;
  17 import java.net.*;
  18
  19 /**
  20  * Retrieves the capabilities doc from a wms server and adds the named layers described there to the ww model.
  21  *
  22  * @author tag
  23  * @version $Id: WMSLayers.java 2131 2007-06-22 22:45:35Z jason $
  24  */
  25 public class WMSLayers extends ApplicationTemplate
  26 {
  27     private static final String[] servers = new String[]
  28         {
  29             "http://neowms.sci.gsfc.nasa.gov/wms/wms"
  30         };
  31
  32     private static class AppFrame extends ApplicationTemplate.AppFrame
  33     {
  34         public AppFrame()
  35         {
  36             try
  37             {
  38                 // Retrieve the server's capabilities document and parse it into a DOM.
  39                 // Set up the DOM.
  40                 DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
  41                 docBuilderFactory.setNamespaceAware(true);
  42                 DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
  43                 Document doc;
  44
  45                 // Request the capabilities document from the server.
  46                 // The server id here is hardcoded. An interactive example would provide a choice.
  47                 String server = servers[0];
  48                 CapabilitiesRequest req = new CapabilitiesRequest(new URI(server));
  49                 doc = docBuilder.parse(req.toString());
  50
  51                 // Parse the DOM as a capabilities document.
  52                 Capabilities caps = Capabilities.parse(doc);
  53                 System.out.println("wms server version: " + caps.getVersion());
  54
  55                 // Get all the named layers in the capabilities document.
  56                 Element[] layerCaps = caps.getNamedLayers();
  57                 if (layerCaps == null || layerCaps.length == 0)
  58                 {
  59                     System.out.println("No named layers found.");
  60                     return;
  61                 }
  62
  63                 // Just choose the first named layer for this example.
  64                 // An interactive example would present the available choices to the user.
  65                 AVListImpl params = new AVListImpl();
  66                 params.setValue(AVKey.LAYER_NAMES, caps.getLayerName(layerCaps[0]));
  67
  68                 // For the chosen layer, determine the available styles and pick one.
  69                 // An interactive example would present the available choices to the user.
  70                 Element[] styles = caps.getLayerStyles(layerCaps[0]);
  71                 if (styles != null && styles.length > 0)
  72                     params.setValue(AVKey.STYLE_NAMES, caps.getStyleName(styles[0]));
  73
  74                 // Create a World Wind wms layer.
  75                 Layer layer = WMSLayerFactory.newLayer(caps, params);
  76
  77                 // The GeoBoost wms server is especially slow, so increase retrieval timeouts
  78                 // if that's the server.
  79                 if (server.contains("GeoBoost"))
  80                 {
  81                     layer.setValue(AVKey.URL_CONNECT_TIMEOUT, 30000);
  82                     layer.setValue(AVKey.URL_READ_TIMEOUT, 30000);
  83                     layer.setValue(AVKey.RETRIEVAL_QUEUE_STALE_REQUEST_LIMIT, 60000);
  84                 }
  85
  86                 // Insert the layer in front of the compass layer in the default layer list.
  87                 insertBeforePlacenames(this.wwd, layer);
  88
  89                 // The layer should start appearing on the globe once this constructor returns.
  90             }
  91             catch (ParserConfigurationException e)
  92             {
  93                 e.printStackTrace();
  94             }
  95             catch (SAXException e)
  96             {
  97                 e.printStackTrace();
  98             }
  99             catch (IOException e)
 100             {
 101                 e.printStackTrace();
 102             }
 103             catch (URISyntaxException e)
 104             {
 105                 e.printStackTrace();
 106             }
 107         }
 108     }
 109
 110     public static void main(String[] args)
 111     {
 112         ApplicationTemplate.start("World Wind Lines In Space", AppFrame.class);
 113     }
 114 }