borrowerdatabase.java

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import java.util.*;
import java.text.*;

/**
 * Maintains a collection of {@link Borrower} objects.
 *
 * @author author name
 * @version  1.0.0
 * @see Borrower
 */
public class BorrowerDatabase {

    /* Collection of <code>Borrower</code> objects.*/
    private Vector  borrowers;

    /**
     * Constructs an empty collection of {@link Borrower}
     * objects.
     */
    public BorrowerDatabase()  {

        borrowers = new Vector();
    }

    /**
     * Adds a {@link Borrower} object to this collection.
     *
     * @param borrower  the {@link Borrower} object.
     */
    public void  addBorrower(Borrower borrower)  {

        borrowers.add(borrower);
    }

    /**
     * Returns an iterator over the borrowers in this database.
     *
     * return  an {@link Iterator}
     */
    public Iterator  getBorrowersIterator() {

        return borrowers.iterator();
    }

    /**
     * Returns the {@link Borrower} object with the specified
     * <code>id</code>. 
     *
     * @param code  the id of the borrower.
     * @return  The {@link Borrower} object with the specifed id.
     *          Returns <code>null</code> if the object with the
     *          id is not found.
     */
    public Borrower  getBorrower(String id)  {

        for (Iterator i = getBorrowersIterator(); i.hasNext();) {

            Borrower borrower = (Borrower) i.next();

            if (borrower.getId().equals(id)) {

                return borrower;
            }
        }

        return null;
    }

    /**
     * Returns the number of {@link Borrower} objects in this
     * collection.
     *
     * @return  the number of {@link Borrower} objects in this
     *          collection.
     */
    public int  getNumberOfBorrowers()  {

        return borrowers.size();
    }
}