/** StrList class
 *  This class provides a set of Strings to be used for 
 *  drawing the Trie
 **/

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

public class StrList {
    private String nodes_array[];
    DataInputStream inStream;
    private int num = 0;
    
    public StrList( URL url ) {
	try {
	    URLConnection urlc = url.openConnection();
	    inStream = new DataInputStream( urlc.getInputStream() );
	    num = loadNodes(inStream);
	}
	catch( IOException e ) {
	    System.out.println("StrList: URL connection error");
	}
    }
    
    private int loadNodes(DataInputStream inStream) {
	int n_nodes = 0, cnt = 0;
	String line, item1;
	
	System.out.println("Load_Nodes: entry" );
	try {
	    // Read the first line of the file
	    //returns the number of elements in the file
	    if ((line = inStream.readLine()) != null) {
		System.out.println("Load_Nodes: line [" + line + "]" );
		StringTokenizer Data = new StringTokenizer(line, " ");
		item1 = Data.nextToken();
		n_nodes = Integer.parseInt( item1 );
		System.out.println("instream is "+ n_nodes);		 
		nodes_array = new String[n_nodes];
		
		// Read the element supplied for the test 
		// and restore them in the array
		while(( cnt < n_nodes ) && ((line = inStream.readLine()) != null) ) {
		    System.out.println("Load_Nodes: line [" + line + "]" );
		    Data = new StringTokenizer(line, " ");
		    item1 = Data.nextToken();
		    nodes_array[cnt] = item1;
		    cnt++;	
		}
		
	    }
	}	
	catch (IOException e) {
	    System.err.println("error in file" +e.toString());
	    System.exit(1);
	}
	return n_nodes;	
    }
    
    public String elementAt( int k ) {
	if ( k < nodes_array.length ) {
	    return nodes_array[k];
	}
	else return null;
    }
    
    public int getDataSize() {
	return num;
    }
}