CSFieldValue.cs :  » Persistence-Frameworks » Vici-CoolStorage » Vici » CoolStorage » C# / CSharp Open Source

#region License
//=============================================================================
// Vici CoolStorage - .NET Object Relational Mapping Library 
//
// Copyright (c) 2004-2009 Philippe Leybaert
//
// 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.
//=============================================================================
#endregion

using System;
using Vici.Core;

namespace Vici.CoolStorage{
  internal enum CSFieldValueState
  {
    Unread,
    Read,
    Dirty
  }

  internal class CSFieldValue
  {
    private CSFieldValueState _valueState = CSFieldValueState.Unread;
    private object _value;

    private readonly CSSchemaField  _schemaField;

    private readonly CSObject       _csObject;

    internal CSFieldValue(CSObject objectData , CSSchemaField schemaField)
    {
      _csObject = objectData;
      _schemaField = schemaField;
    }

    internal CSSchemaField SchemaField
    {
      get
      {
        return _schemaField;
      }
    }

    internal Type BaseType
    {
      get
      {
        return SchemaField.FieldType;
      }
    }

    internal void Reset()
    {
      _value = null;
      _valueState = CSFieldValueState.Unread;
    }

    internal object Value
    {
      get
      {
        if (_valueState == CSFieldValueState.Unread)
        {
          if (_csObject.DataState == CSObjectDataState.KeysLoaded)
          {
            _csObject.Read();
          }

          _csObject.ReadField(SchemaField);

        }

        return _value;
      }
      set
      {
        if (_valueState != CSFieldValueState.Dirty)
          _valueState = CSFieldValueState.Read;

        if (!Equals(value,_value))
        {
          ValueDirect = value;

          _valueState = CSFieldValueState.Dirty;
        }
      }
    }

    internal object ValueDirect
    {
      get
      {
        return _value;
      }
      set
      {
        if (value != null)
        {
          if (value is string && _schemaField.RealType == typeof(DateTime))
            _value = ((string)value).To(_schemaField.FieldType,"yyyy-MM-dd HH:mm:ss.FFFFFFF");
          else
                        _value = value.Convert(_schemaField.FieldType);
        }
          else
            _value = null;
      }
    }

    internal CSFieldValueState ValueState
    {
      get
      {
        return _valueState;
      }
      set
      {
        _valueState = value;
      }
    }

    internal bool IsDirty
    {
      get
      {
        return _valueState == CSFieldValueState.Dirty;
      }
    }

    public override string ToString()
    {
      if (_value == null)
        return null;
      else
        return _value.ToString();
    }
  }
}