ResultMapStrategy.cs :  » Persistence-Frameworks » iBATIS.NET » IBatisNet » DataMapper » MappedStatements » ArgumentStrategy » C# / CSharp Open Source

#region Apache Notice
/*****************************************************************************
 * $Revision: 374175 $
 * $LastChangedDate: 2006-04-25 19:40:27 +0200 (mar., 25 avr. 2006) $
 * $LastChangedBy: gbayon $
 * 
 * iBATIS.NET Data Mapper
 * Copyright (C) 2006/2005 - 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.Data;
using IBatisNet.DataMapper.Configuration.ResultMapping;
using IBatisNet.DataMapper.Scope;

namespace IBatisNet.DataMapper.MappedStatements.ArgumentStrategy{
  /// <summary>
  /// <see cref="IArgumentStrategy"/> implementation when a 'resultMapping' attribute exists
  /// on a <see cref="ArgumentProperty"/>.
  /// </summary>
  public sealed class ResultMapStrategy : BaseStrategy, IArgumentStrategy
  {
    #region IArgumentStrategy Members

    /// <summary>
    /// Gets the value of an argument constructor.
    /// </summary>
    /// <param name="request">The current <see cref="RequestScope"/>.</param>
    /// <param name="mapping">The <see cref="ResultProperty"/> with the argument infos.</param>
    /// <param name="reader">The current <see cref="IDataReader"/>.</param>
    /// <param name="keys">The keys</param>
    /// <returns>The paremeter value.</returns>
    public object GetValue(RequestScope request, ResultProperty mapping, 
                           ref IDataReader reader, object keys)
    {
      object[] parameters = null;
      bool isParameterFound = false;

        IResultMap resultMapping = mapping.NestedResultMap.ResolveSubMap(reader);

            if (resultMapping.Parameters.Count > 0)
      {
                parameters = new object[resultMapping.Parameters.Count];
        // Fill parameters array
                for (int index = 0; index < resultMapping.Parameters.Count; index++)
        {
                    ResultProperty property = resultMapping.Parameters[index];
                    parameters[index] = property.ArgumentStrategy.GetValue(request, property, ref reader, null);
          request.IsRowDataFound = request.IsRowDataFound || (parameters[index] != null);
          isParameterFound = isParameterFound || (parameters[index] != null);
        }
      }

      object obj = null;
      // If I have a constructor tag and all argumments values are null, the obj is null
            if (resultMapping.Parameters.Count > 0 && isParameterFound == false)
      {
        obj = null;
      }
      else
      {
                obj = resultMapping.CreateInstanceOfResult(parameters);
                if (FillObjectWithReaderAndResultMap(request, reader, resultMapping, ref obj) == false)
        {
          obj = null;
        }
      }

      return obj;
    }

    #endregion
  }
}