/* ConeCaller.java 
 * client code for reading cone service via http protocol
*/

package coneclient;
import edu.jhu.pha.ivoa.*;
import java.io.*;
import java.text.*;
import java.net.*;

class ConeCaller {


 public static void main(String[] args) throws Exception{

   int ind =0; 
   String coneUrl="http://chart.stsci.edu/GSCVO/GSC22VO.jsp?";
   double ra,dec,sr;
   if (args.length >= 3 ) {
	   ra	= Double.parseDouble(args[ind++]);
   	   dec	= Double.parseDouble(args[ind++]);
	   sr	= Double.parseDouble(args[ind++]);
	   if (ind < args.length) 
	   {
		   coneUrl = args[ind++];
	   }
	   callConeService(ra,dec,sr,coneUrl);
   } else {
	System.out.println("You need to supply ra,dec,sr,[coneURL] input paramaters.");
	System.exit(1);
   }
}

	// Construct URL and perform http get request
	public static void callConeService(double ra, double dec, double sr, String coneUrl) throws Exception
	{
		URL cone = new URL(coneUrl + "RA="+ra+"&DEC="+dec+"&SR="+sr);
		System.out.println("Calling cone URL: " + cone);

		readVot(cone.openStream());
	}

   // Shows sample of how to parse stream from Cone service http get and
   // output a row of the returned VOTable

   public static void readVot(InputStream is) throws Exception{
    // Using JAVOT VOTable parser
	VOTWrap.VOTable vot = VOTWrap.createVOTable(is);

	int resCount = vot.getResourceCount();
	System.out.println (" has "+ resCount +" resources");
	// could be more than one resource with more than one table - but this is a simple example	
	VOTWrap.Resource res = vot.getResource(0);
	// making assumption there is a table in here 
	VOTWrap.Table tab =  res.getTable(0);

	int fcount = tab.getFieldCount();
	
	System.out.println (" There are "+ fcount +" fields:");

 	for (int f=0; f < fcount; f++) {
	   VOTWrap.Field field = tab.getField(f);
	   System.out.print (field.getID()+":"+field.getUCD()+" ");
	}
	System.out.println();

	// get one line out
	System.out.println();
	System.out.println("Println first row ..");

	VOTWrap.TR row = tab.getTableData().getTR(0);

 	for (int f=0; f < fcount; f++) {
	   VOTWrap.TD td = row.getTD(f);
	   System.out.print (td.getPCDATA()+" ");
	}

	

	
   }
}