// Eric Jewart
// Sample code for CPS 1, Lab 7
// 10 October 1997

package awb;

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

public class Database extends Object
{
    // data members (don't change these):
    protected Questionnaire[] data;	// all the Questionnaires in the database
    protected int size;		// the number of Questionnaires
    protected final int MAX_SIZE = 500;	
				// capacity of database
    protected String status;	// status of database

    // constructor (don't change this)
    public Database()
    {
	data = new Questionnaire[MAX_SIZE];	// create array
	size = 0;			// 0 Questionnaires in array
    }


    public Questionnaire getQuestionnaire(int index)
    {
	return data[index];
    }
  


    // This function reads the available data into
    // the array.  Do not modify this function.  You
    // are not required to understand the Java used in
    // this function (but ask Eric or Steve if you're
    // curious).
    public void initData(String link)
    {
	try {
	    URL u = new URL(link);
	    URLConnection uc = u.openConnection();
	    BufferedReader in = new BufferedReader(new InputStreamReader(uc.getInputStream()));
	    
	    StringTokenizer stok;
	    
	    double year;
	    String gender;
	    String area;
	    String party;
	    String reg;
	    String vote;
	    double pres[] = new double[4];
	    double like[] = new double[4];
	    
	    String line;
	    while ( (line = in.readLine()) != null) {
		stok = new StringTokenizer(line, "|");
		if ( stok.countTokens() != 14 ) continue;
		year = Double.valueOf(stok.nextToken()).doubleValue();
		gender = stok.nextToken();
		area = stok.nextToken();
		party = stok.nextToken();
		reg = stok.nextToken();
		vote = stok.nextToken();
		for ( int i = 0; i < 4; i++)
		    pres[i] = Double.valueOf(stok.nextToken()).doubleValue();
		for ( int i = 0; i < 4; i++)
		    like[i] = Double.valueOf(stok.nextToken()).doubleValue();
		
		data[size++] = new Questionnaire(year, gender, area, party, reg, vote,
						 pres[0], pres[1], pres[2], pres[3],
						 like[0], like[1], like[2], like[3] );
	    }
	    
	    if (size > 0) status = "okay";
	    else status = "no elements found in data file";
	}
	catch (MalformedURLException ex)
	    {
		status = "data file not found";
	    }
	catch (IOException ex)
	    {
		status = "cannot read data file";
	    }
    }
    
    // This function is used by the applet to make sure the 
    // database is okay.  Do not modify it.
    public String checkStatus()
    {
	return status;
    }

    // This function returns the size of the database.  It is
    // used by the DBApplet to display info on the screen.
    public int getSize()
    {
	return size;
    }

    public static void main (String[] args){
	Database db = new Database();
	db.initData("http://www.duke.edu/~bier/awb/election-survey.db");
	int size = db.getSize();
	Questionnaire q;
	for ( int i=0; i< size; i++ ) {
	    q = db.getQuestionnaire(i);
	    System.out.println( q.getYear()+" "+ q.getGender()+" "+q.getArea()+" "+
				q.getParty()+" "+q.getReg()+" "+q.getVote()+" "+
				q.getPresidentRating(0)+" "+q.getPresidentRating(1)+" "+
				q.getPresidentRating(2)+" "+q.getPresidentRating(3)+" "+
				q.getPersonRating(0)+" "+q.getPersonRating(1)+" "+
				q.getPersonRating(2)+" "+q.getPersonRating(3));
	}
	
    }

}