/// <summary>
/// Gets an <see cref="IStreamedDataInfo"/> object describing the data streaming out of this <see cref="QueryModel"/>. If a query ends with
/// the <see cref="SelectClause"/>, this corresponds to <see cref="Clauses.SelectClause.GetOutputDataInfo"/>. If a query has
/// <see cref="QueryModel.ResultOperators"/>, the data is further modified by those operators.
/// </summary>
/// <returns>Gets a <see cref="IStreamedDataInfo"/> object describing the data streaming out of this <see cref="QueryModel"/>.</returns>
/// <remarks>
/// The data streamed from a <see cref="QueryModel"/> is often of type <see cref="IQueryable{T}"/> instantiated
/// with a specific item type, unless the
/// query ends with a <see cref="ResultOperatorBase"/>. For example, if the query ends with a <see cref="CountResultOperator"/>, the
/// result type will be <see cref="int"/>.
/// </remarks>
/// <exception cref="InvalidOperationException">
/// The <see cref="ResultTypeOverride"/> is not compatible with the calculated <see cref="IStreamedDataInfo"/> calculated from the <see cref="ResultOperators"/>.
/// </exception>
public IStreamedDataInfo GetOutputDataInfo()
{
var outputDataInfo = ResultOperators
.Aggregate((IStreamedDataInfo)SelectClause.GetOutputDataInfo(), (current, resultOperator) => resultOperator.GetOutputDataInfo(current));
if (ResultTypeOverride == null)
{
return(outputDataInfo);
}
try
{
return(outputDataInfo.AdjustDataType(ResultTypeOverride));
}
catch (Exception ex)
{
var resultTypeOverride = ResultTypeOverride;
ResultTypeOverride = null;
throw new InvalidOperationException(
string.Format(
"The query model's result type cannot be changed to '{0}'. The result type may only be overridden and set to values compatible with the ResultOperators' current data type ('{1}').",
resultTypeOverride,
outputDataInfo.DataType),
ex);
}
}
/// <summary>
/// Gets an <see cref="IStreamedDataInfo"/> object describing the data streaming out of this <see cref="QueryModel"/>. If a query ends with
/// the <see cref="SelectClause"/>, this corresponds to <see cref="Clauses.SelectClause.GetOutputDataInfo"/>. If a query has
/// <see cref="QueryModel.ResultOperators"/>, the data is further modified by those operators.
/// </summary>
/// <returns>Gets a <see cref="IStreamedDataInfo"/> object describing the data streaming out of this <see cref="QueryModel"/>.</returns>
/// <remarks>
/// The data streamed from a <see cref="QueryModel"/> is often of type <see cref="IQueryable{T}"/> instantiated
/// with a specific item type, unless the
/// query ends with a <see cref="ResultOperatorBase"/>. For example, if the query ends with a <see cref="CountResultOperator"/>, the
/// result type will be <see cref="int"/>.
/// </remarks>
public IStreamedDataInfo GetOutputDataInfo()
{
var outputDataInfo = ResultOperators
.Aggregate((IStreamedDataInfo)SelectClause.GetOutputDataInfo(), (current, resultOperator) => resultOperator.GetOutputDataInfo(current));
if (ResultTypeOverride != null)
{
return(outputDataInfo.AdjustDataType(ResultTypeOverride));
}
else
{
return(outputDataInfo);
}
}