private TranslateResult Translate(Expression expression)
{
var projection = expression as ProjectionExpression;
var subQuery = expression as SubQueryProjection;
var groupQuery = expression as GroupingProjection;
if (groupQuery != null)
{
throw new TabularException("Can't Return groups from group by you must use aggregates, or retrieve the complete table and run groupng in Linq to objects");
////var query = new TabularGroupByRewriter(groupQuery).Rewrite();
////return Translate(query);
}
if (subQuery != null)
{
projection = subQuery.Projection;
}
expression = TabularEvaluator.PartialEval(expression);
var binder = new TabularQueryBinder(this);
var boundExpression = binder.Bind(expression);
var orders = binder.OrderByColumns;
if (projection == null && subQuery == null)
{
if (boundExpression is ProjectionExpression)
{
projection = (ProjectionExpression)boundExpression;
}
else
{
return(Translate(boundExpression));
}
}
if (projection == null)
{
throw new TabularException("Could not translate");
}
string commandText = new TabularQueryFormatter().Format(projection.Source, orders);
LambdaExpression projector = new ProjectionBuilder().Build(projection.Projector);
return
(new TranslateResult
{
CommandText = commandText,
Projector = projector
});
}
/// <summary>
/// Initializes a new instance of the <see cref="TableFactory"/> class.
/// </summary>
/// <param name="binder">reference for the binder object</param>
public TableFactory(TabularQueryBinder binder)
{
_binder = binder;
}
/// <summary>
/// Initializes a new instance of the <see cref="ColumnExpressionFactory"/> class.
/// </summary>
/// <param name="binder">parent binder object</param>
public ColumnExpressionFactory(TabularQueryBinder binder)
{
_binder = binder;
}
/// <summary>
/// Initializes a new instance of the <see cref="AllExpressionFactory"/> class.
/// </summary>
/// <param name="binder">parent binder reference</param>
public AllExpressionFactory(TabularQueryBinder binder)
{
_binder = binder;
}