DataColumnPropertyDescriptor.cs :  » 2.6.4-mono-.net-core » System.Data » System » Data » C# / CSharp Open Source

//
// System.Data.DataColumnPropertyDescriptor.cs
//
// Author:
//   Daniel Morgan <danmorg@sc.rr.com>
//
// (c) copyright 2002 Daniel Morgan
//

//
// Copyright (C) 2004 Novell, Inc (http://www.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.Data.Common;
using System.ComponentModel;
using System.Reflection;

namespace System.Data{
  internal class DataColumnPropertyDescriptor : PropertyDescriptor 
  {
    private bool readOnly = true;
    private Type componentType = null;
    private Type propertyType = null;
    private bool browsable = true;

    //private PropertyInfo prop = null;
    private int columnIndex = 0;

    public DataColumnPropertyDescriptor (string name, int columnIndex, Attribute [] attrs)
      : base (name, attrs) 
    {
      this.columnIndex = columnIndex;
    }

    public DataColumnPropertyDescriptor (DataColumn dc)
      : base (dc.ColumnName, null) 
    {
      this.columnIndex = dc.Ordinal;
      this.componentType = typeof(DataRowView);
      this.propertyType = dc.DataType;
      this.readOnly = dc.ReadOnly;
    }

    public void SetReadOnly (bool value) 
    {
      readOnly = value;
    }
    
    public void SetComponentType (Type type) 
    {
      componentType = type;
    }

    public void SetPropertyType (Type type) 
    {
      propertyType = type;
    }

    public void SetBrowsable (bool browsable)
    {
      this.browsable = browsable;
    }

    public override object GetValue (object component) 
    {
      // FIXME: what is the correct way to Get a Value?
      if(componentType == typeof(DataRowView) && component is DataRowView) {
        DataRowView drv = (DataRowView) component;
        return drv[base.Name];
      }
      else if(componentType == typeof(DbDataRecord) && component is DbDataRecord) {
        DbDataRecord dr = (DbDataRecord) component;
        return dr[columnIndex];
      }
      throw new InvalidOperationException();

      /*
      if (prop == null)
        prop = GetPropertyInfo ();    
              
      // FIXME: should I allow multiple parameters?                      
      object[] parms = new object[1];
      parms[0] = base.Name;
      return prop.GetValue (component, parms);
      */
    }

    public override void SetValue(object component,  object value) 
    {
      DataRowView drv = (DataRowView) component;
      drv[base.Name] = value;
      /*
      if (prop == null)
        prop = GetPropertyInfo ();    

      if (readOnly == true) {
        // FIXME: what really happens if read only?
        throw new Exception("Property is ReadOnly");
      }
      
      // FIXME: should I allow multiple parameters?
      object[] parms = new Object[1];
      parms[0] = base.Name;
      prop.SetValue (component, value, parms);
      */
    }

    [MonoTODO]
    public override void ResetValue(object component) 
    {
      // FIXME:
    }

    [MonoTODO]
    public override bool CanResetValue(object component) 
    {
      return false; // FIXEME
    }

    [MonoTODO]
    public override bool ShouldSerializeValue(object component) 
    {
      return false;
    }

    public override Type ComponentType {
      get {
        return componentType;
      }
    }

    public override bool IsReadOnly {
      get {
        return readOnly;  
      }
    }

    public override bool IsBrowsable {
      get { return browsable && base.IsBrowsable; }
    }

    public override Type PropertyType {
      get {
        return propertyType;
      }
    }
  }
}