Advancing Water Resources Research and Management

  String version = System.getProperty("java.version");
  Debug.println("Java version is "+version);
  if(version.indexOf("1.1") >= 0 ||
     version.indexOf("2.") >= 0 ) {
    //we are version 1.1
    try {
      Class lgz = Class.forName("LoadGZIP");
      lgz.newInstance();		// load the gzipped file
      bad_gz=false;
    } catch (Exception e) {
      Debug.println("Exception trying to find class Version11: "+e);
      bad_gz=true;
    }
  } else {
    Debug.println("Processing for java "+version);
    bad_gz = true;
  }
  
  if(bad_gz) {
    //get the station info the old way
   etc...

And here is the class that implements the decompression:

import java.io.*;
import java.net.*;
import java.util.zip.*;

public class LoadGZIP {
  // this java v 1.1 class is conditionally loaded by
  // StationLoader.java.
  //
  // In order to be instantiated by java v 1.0.2 - compatible code by the
  // newInstance() method, it must have a constructor with no args.

public LoadGZIP() {
    try {
      URL stationURL = new URL(ZoomMap.code_base,"station_info.gz");
      URLConnection urlc = stationURL.openConnection();
      urlc.setUseCaches(false);
      InputStream fin = stationURL.openStream();
      BufferedInputStream bfin = new BufferedInputStream(fin,4096);
      // class GZIPInputStream is java v 1.1
      GZIPInputStream zis= new GZIPInputStream(bfin);
      StationLoader.in = new DataInputStream(zis);
      Debug.println("Reading station_info.gz");
    } catch (Error err) {
      Debug.println("Error getting station_info.gz: "+err);
    } catch (Exception ex) {
      Debug.println("Exception finding station_info.gz: "+ex);
    }
  }
}

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