garageimpl.java

Java的面向对象数据库系统的源代码

import org.ozoneDB.OzoneObject;
import java.util.*;

public class GarageImpl extends OzoneObject implements Garage {
    
    /**
    Set version of the serialized data to make it compatible with
    new class versions.
    */
    final static long 	serialVersionUID = 1L;
    
    private Hashtable	cars;
    
    public GarageImpl() {
        cars = new Hashtable();
    }
    
    public void addCar_update( String name, int yearOfConst ) throws Exception {
        Car car = (Car)database().createObject( CarImpl.class.getName() );
        car.setName( name );
        car.setYearOfConst( yearOfConst );
        cars.put( car.name(), car );
    }
    
    public Car carForName( String name ) {
        return (Car)cars.get( name );
    }
    
    public Car removeCar_update( String name ) {
        return (Car)cars.remove( name );
    }
    
    public Vector oldtimers() {
        Vector result = new Vector();
        for (Enumeration e=cars.elements(); e.hasMoreElements(); ) {
            Car car = (Car)e.nextElement();
            if (car.age() >= 20) {
                result.add( car );
            }
        }
        return result;
    }
    
    public void onDelete() {
        for (Enumeration e=cars.elements(); e.hasMoreElements(); ) {
            Car car = (Car)e.nextElement();
            database().deleteObject( car );
        }
    }
}