unitsystemfactory.cs

改程序能够查询课程表

using System;
using System.Collections.Generic;
using System.Text;

namespace Common.Utility.Unit {
    public class UnitSystemFactory {

        private static Dictionary<UnitSystemEnum, UnitSystem> unitSystems = new Dictionary<UnitSystemEnum, UnitSystem>();

        public static UnitSystem GetUnitSystem(UnitSystemEnum name) {
            if (unitSystems.ContainsKey( name )) {
                return unitSystems[name];
            }

            UnitSystem unitSystem;
            switch (name) {
                case UnitSystemEnum.International:
                    unitSystem = new InternationalUnitSystem();
                    unitSystems.Add( name, unitSystem );
                    break;
                case UnitSystemEnum.Metric:
                    unitSystem = new MetricUnitSystem();
                    unitSystems.Add( name, unitSystem );
                    break;
                case UnitSystemEnum.English:
                    unitSystem = new EnglishUnitSystem();
                    unitSystems.Add( name, unitSystem );
                    break;
                default:
                    unitSystem = new InternationalUnitSystem();
                    unitSystems.Add( name, unitSystem );
                    break;
            }
            return unitSystem;
        }
    }
}