/*
This example puts together various Java elements into a complete program to set up a table, keyed by a text string,
of objects. We've used a "Hashmap" from the Java Utility Package to hold our keys and the objects which we've
associated with each key - in this case railway station information keyed by the industry's internal three letter
code system. You'll note that there's no detail of what the data format of the incoming data file is in this
main application, as that minutiae is delegated down to the NetworkStation class, which will be written and
maitaineed by an expert in that particular data, and can be shared between a number of different applications all of
which need to access that data.
*/

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

public class AUtil{
public static void main(String [] args) throws IOException {

// We're going to read the incoming data file defined on the comment line, one line at a time

        BufferedReader Stuff = new BufferedReader(new FileReader(args[0]));

        String lyne;
        HashMap info = new HashMap();

// Loop through the incoming lines of data and pass each to a factory to return a NetworkStation object
        while ( (lyne = Stuff.readLine()) != null) {
                NetworkStation current = (NetworkStation)NetworkStation.Factory(lyne);
                // We've assumed that the factory always succeeds. May want to check for null return?
                String ThreeLetterCode = current.getCode();
                // add the object newly manufactured by the factory into the hash
                info.put(ThreeLetterCode,current);
        }

// For testing, output the object that has the key "LLS" as converted to a string

        System.out.println(info.get("LLS"));

// Iterate through the hash ... in other words output all the objects

        Set Places = info.keySet();
        Iterator Place = Places.iterator();

        while(Place.hasNext()) {
                String TLC = (String)Place.next();
                System.out.println(TLC);
                System.out.println(info.get(TLC));
        }

}}