dataprovider.cs

一种.net实现ajax方法的类库

/** Copyright (c) 2006, All-In-One Creations, Ltd.
*  All rights reserved.
* 
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
* 
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*     * Neither the name of All-In-One Creations, Ltd. nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
* 
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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/**
 * Project: emergetk: stateful web framework for the masses
 * File name: DataProvider.cs
 * Description: base class for DataProvider implementations, with static helper methods to shortcut provider determination.
 *   
 * Author: Ben Joldersma
 *   
 */

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

namespace EmergeTk.Model
{
    public abstract class DataProvider : IDataProvider
    {
        static Dictionary<Type, DataProvider> Providers = new Dictionary<Type, DataProvider>();

        public static void RegisterProvider(Type t, DataProvider provider )
        {
            Providers[t] = provider;
        }

        public static DataProvider RequestProvider<T>() where T : AbstractRecord, new()
        {
            Type t = typeof(T);
            if (!Providers.ContainsKey(t))
            {
            	T r = new T();//dummy instantiation to register provider.            	
            }
            return Providers[t];
        }

        public static IRecordList<T> LoadList<T>() where T : AbstractRecord, new()
            { return RequestProvider<T>().Load<T>(); }
        public static IRecordList<T> LoadList<T>(params SortInfo[] sortInfos) where T : AbstractRecord, new()
        {
            IRecordList<T> list = RequestProvider<T>().Load<T>(sortInfos);
            list.Sorts = new List<SortInfo>(sortInfos);
            return RequestProvider<T>().Load<T>(sortInfos); 
        }
        public static IRecordList<T> LoadList<T>(params FilterInfo[] filterInfos) where T : AbstractRecord, new()
        {
            IRecordList<T> list = RequestProvider<T>().Load<T>(filterInfos);
            list.Filters = new List<FilterInfo>(filterInfos);
            return RequestProvider<T>().Load<T>(filterInfos); 
        }
        public static IRecordList<T> LoadList<T>(FilterInfo[] filterInfos, SortInfo[] sortInfos) where T : AbstractRecord, new()
        { 
            IRecordList<T> list = RequestProvider<T>().Load<T>(filterInfos, sortInfos);
            list.Filters = new List<FilterInfo>(filterInfos);
            list.Sorts = new List<SortInfo>(sortInfos);
            return list;
        }    

        virtual public IRecordList<T> Load<T>() where T : AbstractRecord, new() {return null;}
        virtual public IRecordList<T> Load<T>(params SortInfo[] sortInfos) where T : AbstractRecord, new() {return null;}
        virtual public IRecordList<T> Load<T>(params FilterInfo[] filterInfos) where T : AbstractRecord, new() {return null;}
        virtual public IRecordList<T> Load<T>(FilterInfo[] filterInfos, SortInfo[] sortInfos) where T : AbstractRecord, new() {return null;}
    }
}