abstractrecord.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:
* 
*     * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
*     * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
*     * 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"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**/
/**
 * Project: emergetk: stateful web framework for the masses
 * File name: AbstractRecord.cs
 * Description: AbstractRecord is the base class for Model Record implementations.  Currently, there are SQLiteRecord, and XMLRecord.
 * In the near future we plan to provide support for MySQL, and MS SQL at the very least.  Any database implementations are welcomed.
 *   
 * Author: Ben Joldersma
 *   
 */


using System;
using System.Reflection;
using System.Collections.Generic;
using System.Data;
namespace EmergeTk.Model
{
    public delegate void RecordHandler(AbstractRecord r);

    public class AbstractRecord : IDataBindable, IRecord
    {
    	public AbstractRecord(){}
    	
        protected int id = 0;
        virtual public int Id { get { return id; } internal set { id = value; } }

        private Dictionary<string, Model.NotifyPropertyChanged> notifyPropertyChangedHandlers;

        virtual public Dictionary<string, Model.NotifyPropertyChanged> NotifyPropertyChangedHandlers
        {
            get
            {
                if (notifyPropertyChangedHandlers == null) notifyPropertyChangedHandlers = new Dictionary<string, NotifyPropertyChanged>();
                return notifyPropertyChangedHandlers;
            }
        }

        virtual public void BindProperty(string name, NotifyPropertyChanged del)
        {
            if (NotifyPropertyChangedHandlers.ContainsKey(name))
                NotifyPropertyChangedHandlers[name] += del;
            else
                NotifyPropertyChangedHandlers[name] = del;
        }

        private List<Binding> bindings;
        public virtual List<Binding> Bindings { get { return bindings; } }
        virtual public void Bind(Binding b)
        {
            if (b.Fields != null)
                foreach (string field in b.Fields)
                    bindField(b, field);
            else
                bindField(b, b.SourceProperty);
            if (bindings == null) bindings = new List<Binding>();
            bindings.Add(b);
        }

        protected void bindField(Binding b, string field)
        {
            if (field == "Id") return;
            if (GetFieldInfoFromName(field).DataType == DataType.RecordSelect)
            {
                SQLiteRecord r = this[field] as SQLiteRecord;
                if (r != null)
                    r.OnChange += new RecordHandler(delegate(AbstractRecord c) { b.OnSourceChanged(); });
            }
            if (NotifyPropertyChangedHandlers.ContainsKey(field))
                NotifyPropertyChangedHandlers[field] += b.OnSourceChanged;
            else
                NotifyPropertyChangedHandlers[field] = b.OnSourceChanged;
        }

        virtual public void Unbind(Binding b)
        {
            if (b.Fields != null)
                foreach (string field in b.Fields)
                    unbindField(b, field);
            else
                unbindField(b, b.SourceProperty);
            bindings.Remove(b);
        }

        protected void unbindField(Binding b, string field)
        {
            if (NotifyPropertyChangedHandlers != null) NotifyPropertyChangedHandlers[field] -= b.OnSourceChanged;
        }

        virtual public string ModelName { get { return this.GetType().Name; } }

        virtual public object this[string Name]
        {
            get