DynamicDataManager.cs :  » 2.6.4-mono-.net-core » System.Web » System » Web » DynamicData » C# / CSharp Open Source

//
// DynamicDataManager.cs
//
// Author:
//  Atsushi Enomoto <atsushi@ximian.com>
//      Marek Habersack <mhabersack@novell.com>
//
// Copyright (C) 2008-2009 Novell Inc. http://novell.com
//

//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Drawing;
using System.Globalization;
using System.Security.Permissions;
using System.Security.Principal;
using System.Web.Caching;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.DynamicData.ModelProviders;

namespace System.Web.DynamicData{
  [ToolboxBitmap (typeof(DynamicDataManager), "DynamicDataManager.ico")]
  [AspNetHostingPermission (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  [NonVisualControl]
  [ParseChildren (true)]
  [PersistChildren (false)]
  public class DynamicDataManager : Control
  {
    private class AutoFieldGenerator : IAutoFieldGenerator
    {
      MetaTable table;
      
      public AutoFieldGenerator (MetaTable table)
      {
        this.table = table;
      }
      
      public ICollection GenerateFields (Control ctl)
      {
        var ret = new List <DynamicField> ();
        foreach (MetaColumn column in table.Columns) {
          if (!column.Scaffold)
            continue;
          
          var field = new DynamicField ();
          field.DataField = column.Name;
          ret.Add (field);
        }
        
        return ret;
      }
    }

    Dictionary <IDynamicDataSource, bool> knownDataSources;
    
    public DynamicDataManager ()
    {
    }

    public bool AutoLoadForeignKeys {
      get;
      set;
    }

    [Browsable (false)]
    public override bool Visible {
      get { return true; }

      // NOTE: it is supposed to throw the exception
      set { throw new NotImplementedException (); }
    }

    protected override void OnLoad (EventArgs e)
    {
      base.OnLoad (e);

      // http://forums.asp.net/p/1257004/2339034.aspx
      // http://forums.asp.net/t/1297860.aspx
      // http://forums.asp.net/p/1396453/3005197.aspx#3005197
      if (knownDataSources != null) {
        foreach (var de in knownDataSources) {
          IDynamicDataSource dds = de.Key;
          if (dds == null)
            continue;

          dds.ExpandDynamicWhereParameters ();
        }
      }
    }

    public void RegisterControl (Control control)
    {
      RegisterControl (control, false);
    }

    public void RegisterControl (Control control, bool setSelectionFromUrl)
    {
      // .NET doesn't check for null here, but since I don't like such code, we
      // will do the check and throw the same exception as .NET
      if (control == null)
        throw new NullReferenceException ();

      if (!ControlIsValid (control))
        throw new Exception ("Controls of type " + control.GetType () + " are not supported.");

      // http://forums.asp.net/p/1257004/2339034.aspx
      // http://forums.asp.net/p/1383908/2936065.aspx
      DataBoundControl dbc = control as DataBoundControl;
      if (dbc != null) {
        IDynamicDataSource dds = dbc.DataSourceObject as IDynamicDataSource;
        if (dds == null)
          return;

        RegisterDataSource (dds);
        MetaTable table = dds.GetTable ();
        if (table == null)
          return;

        if (String.IsNullOrEmpty (dds.Where))
          dds.AutoGenerateWhereClause = true;
        else
          dds.AutoGenerateWhereClause = false;

        Type contextType = dds.ContextType;
        if (contextType == null)
          dds.ContextType = table.DataContextType;

        string entityName = dds.EntitySetName;
        if (String.IsNullOrEmpty (entityName))
          dds.EntitySetName = table.DataContextPropertyName;

        if (AutoLoadForeignKeys) {
          var ldds = dds as LinqDataSource;
          if (ldds != null)
            ldds.LoadWithForeignKeys (table.EntityType);
        }
        
        var gv = control as GridView;
        if (gv != null) {
          gv.ColumnsGenerator = new AutoFieldGenerator (table);
          return;
        }

        var dv = control as DetailsView;
        if (dv != null) {
          dv.RowsGenerator = new AutoFieldGenerator (table);
          return;
        }
      }
    }

    void RegisterDataSource (IDynamicDataSource dds)
    {
      if (knownDataSources == null) {
        knownDataSources = new Dictionary <IDynamicDataSource, bool> ();
        knownDataSources.Add (dds, true);
        return;
      }
      
      if (knownDataSources.ContainsKey (dds))
        return;

      knownDataSources.Add (dds, true);
    }
    
    bool ControlIsValid (Control control)
    {
      if (control is Repeater) {
        if (control.NamingContainer == null)
          throw new HttpException ("The Repeater control '" + control.ID + "' does not have a naming container.");
        return true;
      }
      
      DataBoundControl dbc = control as DataBoundControl;
      if (dbc == null)
        return false;
      
      return true;
    }
  }
}