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

public class CustomerCollection implements CollectionIF
{
	private String dbname;
	private Vector vCustomers;
	
	public CustomerCollection( String filename )
	{
		dbname = filename;
		vCustomers = new Vector();
	}
			
	public int getNextID()
	{  
		if ( vCustomers.isEmpty() ) return 1;
		return ((Customer) (vCustomers.lastElement())).getID() + 1;
	}
	
	public void addRecord( Vector v )
	{
		Customer cust = new Customer( );
		cust.setID( Integer.parseInt( (String) v.elementAt( 0 ) ) );
		vCustomers.addElement( cust );
	}
	
	public void loadRecords()
	{
		DataInputStream infile_cust = null;
		
		Customer cust;
		try
		{
			infile_cust = new DataInputStream( new FileInputStream( dbname ) );
		}
		catch ( FileNotFoundException e ) {}
		
		while ( true )
		{
			cust = new Customer();
			try
			{
				cust.retrieve( infile_cust );
				infile_cust.readByte();
				vCustomers.addElement ( cust );
			}
			catch ( EOFException eof ) 
			{
				System.out.println("We have hit end of file!"); 
				break;
			}
			catch ( IOException e ){ }
		}
	}
	
	public void storeRecords()
	{
		DataOutputStream outfile_cust = null;
		try 
		{
			outfile_cust = new DataOutputStream( new FileOutputStream( dbname ) );
		}
		catch ( IOException e ) {}
	
		for ( int i = 0; i < vCustomers.size(); i++ )
		{
			Customer cust = (Customer) vCustomers.elementAt( i );
			cust.persist( outfile_cust );
			try 
			{
				outfile_cust.writeByte( (byte) '¬' );
			}
			catch ( IOException e ) {}
		}
	}
	
	public void modifyRecord( Vector v )
	{
		for ( int i = 0; i < vCustomers.size(); i++ )
			if ( ( (Customer) vCustomers.elementAt( i )).equals( v ) ) 
			{System.out.println("we have modified");
				( (Customer) vCustomers.elementAt( i ) ).update( v );
			}
	}
	
	public void deleteRecord( int i )
	{
		vCustomers.removeElementAt( i );
	}

	public PersistentObject getRecord( int i )
	{
		return (PersistentObject) vCustomers.elementAt( i );
	}
	
	public int size()
	{
		return vCustomers.size();
	}
}