#region Apache Notice
/*****************************************************************************
 * $Revision: 374175 $
 * $LastChangedDate$
 * $LastChangedBy$
 * 
 * iBATIS.NET Data Mapper
 * Copyright (C) 2008/2005 - The Apache Software Foundation
 *  
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 ********************************************************************************/
#endregion

using System;
using System.Data;
using Apache.Ibatis.DataMapper.Model.ResultMapping;
using Apache.Ibatis.DataMapper.Scope;
using Apache.Ibatis.DataMapper.TypeHandlers;

namespace Apache.Ibatis.DataMapper.MappedStatements.PropertyStrategy
{
	/// <summary>
	/// <see cref="IPropertyStrategy"/> implementation when no 'select' or
	/// 'resultMapping' attribute exists on a <see cref="ResultProperty"/>.
	/// </summary>
    public sealed class DefaultStrategy : IPropertyStrategy
	{
		#region IPropertyStrategy members

		///<summary>
		/// Sets value of the specified <see cref="ResultProperty"/> on the target object
		/// when the 'select' and 'resultMap' attributes 
		/// on the <see cref="ResultProperty"/> are empties.
		/// </summary>
		/// <param name="request">The request.</param>
		/// <param name="resultMap">The result map.</param>
		/// <param name="mapping">The ResultProperty.</param>
		/// <param name="target">The target.</param>
		/// <param name="reader">The reader.</param>
		/// <param name="keys">The keys</param>
		public void Set(RequestScope request, IResultMap resultMap, 
			ResultProperty mapping, ref object target, IDataReader reader, object keys)
		{
            object obj = Get(request, resultMap, mapping, ref target, reader);
            resultMap.SetValueOfProperty(ref target, mapping, obj);
		}

        /// <summary>
        /// Gets the value of the specified <see cref="ResultProperty"/> that must be set on the target object.
        /// </summary>
        /// <param name="request">The request.</param>
        /// <param name="resultMap">The result map.</param>
        /// <param name="mapping">The mapping.</param>
        /// <param name="reader">The reader.</param>
        /// <param name="target">The target object</param>
        public object Get(RequestScope request, IResultMap resultMap, ResultProperty mapping, ref object target, IDataReader reader)
        {
            if (mapping.TypeHandler == null ||mapping.TypeHandler is UnknownTypeHandler) // Find the TypeHandler
            {
                lock (mapping)
                {
                    if (mapping.TypeHandler == null || mapping.TypeHandler is UnknownTypeHandler)
                    {
                        int columnIndex = 0;
                        if (mapping.ColumnIndex == ResultProperty.UNKNOWN_COLUMN_INDEX)
                        {
                            columnIndex = reader.GetOrdinal(mapping.ColumnName);
                        }
                        else
                        {
                            columnIndex = mapping.ColumnIndex;
                        }
                        Type systemType = reader.GetFieldType(columnIndex);

                        mapping.TypeHandler = request.DataExchangeFactory.TypeHandlerFactory.GetTypeHandler(systemType);
                    }
                }
            }

            object dataBaseValue = mapping.GetDataBaseValue(reader);
            request.IsRowDataFound = request.IsRowDataFound || (dataBaseValue != null);
            return dataBaseValue;
        }

		#endregion
	}
}