//Code example for manipulating binary data
import java.lang.*;
import java.util.*;

public class CityRec { // definition of a city record

  private int x;
  private int y;
  private String name;

        public CityRec(int inx, int iny,  String inname)
        /* constructor 1: specify x, y and name */
        {
                x=inx;
                y=iny;
                name=inname;
        }

        public CityRec(byte record[])
        /* constructor 2: specify a byte array record with the first 
           byte containing the length, followed by x, y and name */
        {
		x = ((int) (record[1] & 0xFF) << 24) +
				((int) (record[2] & 0xFF) << 16) +
				((int) (record[3] & 0xFF) << 8 )+
				((int) (record[4] & 0xFF) << 0 );

		y = ((int) (record[5] & 0xFF) << 24) +
				((int) (record[6] & 0xFF) << 16) +
				((int) (record[7] & 0xFF) << 8 )+
				((int) (record[8] & 0xFF) << 0 );
		name = new String(record, 9, (int)record[0] - 9);
        }

        
        public int x()
        { return x;}
 
        public int y()
        { return y;}
 
        public String name()
        { return name;}
 
	public byte[] getRecord(){
          // compose a byte array record out of this CityRec object

          //reclength will be the sum of the sizes of x, y, name plus 1
          int reclength = 8 + name.length()+1;
  
          byte[] record=new byte[reclength]; // defining the byte array

          //store x;
          record[0] = (byte)reclength;
          record[1] = (byte)(x >> 24);
          record[2] = (byte)(x >> 16);
          record[3] = (byte)(x >> 8);
          record[4] = (byte)(x >> 0);
          
          //store y;
          record[5] = (byte)(y >> 24);
          record[6] = (byte)(y >> 16);
          record[7] = (byte)(y >> 8);
          record[8] = (byte)(y >> 0);
          
          //store name;
          for(int i=0; i < name.length(); i++)
          record[9+i] = (byte)(name.charAt(i));
          return record;
          }

	public static void main(String[] args)
	{
	  int inx = 1000;
	  int iny = 2038;
	  String inname = "Falls Church";

		CityRec a= new CityRec(inx, iny, inname);

		//check this CityRec object
		System.out.println("check the CityRec object: ");
		System.out.println("X coord: "+a.x());
		System.out.println("Y coord: "+a.y());
		System.out.println("Name: "+a.name());
		System.out.println();

                // convert the CityRec object into the byte array object format
		byte[] aRecord=a.getRecord();

                // check record
		System.out.println("check the byte array record: ");
		System.out.println("record length: "+Byte.toString(aRecord[0]));

                //convert the byte array object into the CityRec object format
		CityRec b = new CityRec(aRecord);
		System.out.println("X coord: "+b.x());
		System.out.println("Y coord: "+b.y());
		System.out.println("Name: "+b.name());



	} // end main
}