public IEnumerable <T> ExecuteCollection <T>(QueryModel queryModel)
{
var selectQuery = HabQueryModelVisitor.GenerateSelectQuery(queryModel);
var businessObjectCollection = BORegistry.DataAccessor.BusinessObjectLoader.GetBusinessObjectCollection(selectQuery.ClassDef, selectQuery);
if (typeof(T) == selectQuery.ClassDef.ClassType)
{
return((from object obj in businessObjectCollection select(T) obj).ToList());
}
var expression = queryModel.SelectClause.Selector;
if (expression.NodeType == ExpressionType.MemberAccess)
{
var member = (MemberExpression)expression;
string name = member.Member.Name;
return(new PropertyEnumerator <T>(businessObjectCollection, name));
}
else if (expression.NodeType == ExpressionType.New)
{
var newExpression = (NewExpression)expression;
var propertyNames = newExpression.Members.Select(info => info.Name);
return(new NewEnumerator <T>(businessObjectCollection, newExpression.Constructor, propertyNames));
}
return(new List <T>());
}
private ISelectQuery _selectQuery;// = new SelectQuery();
public static ISelectQuery GenerateSelectQuery(QueryModel queryModel)
{
var visitor = new HabQueryModelVisitor();
visitor.VisitQueryModel(queryModel);
return(visitor.GetSelectQuery());
}
