public virtual void VisitMainFromClause (MainFromClause fromClause, QueryModel queryModel)
{
ArgumentUtility.CheckNotNull ("fromClause", fromClause);
ArgumentUtility.CheckNotNull ("queryModel", queryModel);
// nothing to do here
}
/// <summary>
/// Clones this clause, registering its clone with the <paramref name="cloneContext"/>.
/// </summary>
/// <param name="cloneContext">The clones of all query source clauses are registered with this <see cref="CloneContext"/>.</param>
/// <returns>A clone of this clause.</returns>
public MainFromClause Clone (CloneContext cloneContext)
{
ArgumentUtility.CheckNotNull ("cloneContext", cloneContext);
var clone = new MainFromClause (ItemName, ItemType, FromExpression);
cloneContext.QuerySourceMapping.AddMapping (this, new QuerySourceReferenceExpression (clone));
return clone;
}
/// <summary>
/// Clones this clause, registering its clone with the <paramref name="cloneContext"/>.
/// </summary>
/// <param name="cloneContext">The clones of all query source clauses are registered with this <see cref="CloneContext"/>.</param>
/// <returns>A clone of this clause.</returns>
public MainFromClause Clone(CloneContext cloneContext)
{
ArgumentUtility.CheckNotNull("cloneContext", cloneContext);
var clone = new MainFromClause(ItemName, ItemType, FromExpression);
cloneContext.QuerySourceMapping.AddMapping(this, new QuerySourceReferenceExpression(clone));
return(clone);
}
private MainFromClause CreateMainFromClause (ClauseGenerationContext clauseGenerationContext)
{
var fromClause = new MainFromClause (
AssociatedIdentifier,
QuerySourceElementType,
ParsedExpression);
clauseGenerationContext.AddContextInfo (this, fromClause);
return fromClause;
}
public override void VisitMainFromClause (MainFromClause fromClause, QueryModel queryModel)
{
ArgumentUtility.CheckNotNull ("fromClause", fromClause);
ArgumentUtility.CheckNotNull ("queryModel", queryModel);
var subQueryExpression = fromClause.FromExpression as SubQueryExpression;
if (subQueryExpression != null)
FlattenSubQuery (subQueryExpression, fromClause, queryModel, 0);
base.VisitMainFromClause (fromClause, queryModel);
}
/// <summary>
/// Initializes a new instance of <see cref="QueryModel"/>
/// </summary>
/// <param name="mainFromClause">The <see cref="Clauses.MainFromClause"/> of the query. This is the starting point of the query, generating items
/// that are filtered and projected by the query.</param>
/// <param name="selectClause">The <see cref="SelectClause"/> of the query. This is the end point of
/// the query, it defines what is actually returned for each of the items coming from the <see cref="MainFromClause"/> and passing the
/// <see cref="BodyClauses"/>. After it, only the <see cref="ResultOperators"/> modify the result of the query.</param>
public QueryModel (MainFromClause mainFromClause, SelectClause selectClause)
{
ArgumentUtility.CheckNotNull ("mainFromClause", mainFromClause);
ArgumentUtility.CheckNotNull ("selectClause", selectClause);
_uniqueIdentifierGenerator = new UniqueIdentifierGenerator();
MainFromClause = mainFromClause;
SelectClause = selectClause;
BodyClauses = new ObservableCollection<IBodyClause>();
BodyClauses.CollectionChanged += BodyClauses_CollectionChanged;
ResultOperators = new ObservableCollection<ResultOperatorBase>();
ResultOperators.CollectionChanged += ResultOperators_CollectionChanged;
}
public override void VisitMainFromClause(MainFromClause fromClause, QueryModel queryModel)
{
if (fromClause.FromExpression as SubQueryExpression != null)
throw new Exception("MainFromClause.FromExpression cant be SubQueryExpression because group by is handle in itself clause");
string fromName = LinqUtility.ResolveCollectionName(this.Db, fromClause.ItemType);
if (fromClause.FromExpression.Type.Name == "IGrouping`2")
{
var groupByClause = LinqUtility.PriorGroupBy(ParnetModelVisitor);
var parentMVisitor = LinqUtility.FindParentModelVisitor(this);
//parentMVisitor.GroupByNameCounter++;
fromName = groupByClause[0].TranslateIntoName();
fromName = LinqUtility.ResolvePropertyName(fromName);
}
if (fromClause.FromExpression.NodeType == ExpressionType.Constant
|| fromClause.FromExpression.Type.Name == "IGrouping`2")
{
if (fromClause.FromExpression.Type.Name == "AqlQueryable`1" || fromClause.FromExpression.Type.Name == "IGrouping`2")
QueryText.AppendFormat(" for {0} in {1} ", LinqUtility.ResolvePropertyName(fromClause.ItemName), fromName);
else
{
QueryText.AppendFormat(" for {0} in ", LinqUtility.ResolvePropertyName(fromClause.ItemName));
GetAqlExpression(fromClause.FromExpression, queryModel);
}
}
else
{
QueryText.AppendFormat(" for {0} in ", LinqUtility.ResolvePropertyName(fromClause.ItemName));
GetAqlExpression(fromClause.FromExpression, queryModel);
}
base.VisitMainFromClause(fromClause, queryModel);
}
/// <summary>
/// Creates a new <see cref="QueryModel"/> that has this <see cref="QueryModel"/> as a sub-query in its <see cref="MainFromClause"/>.
/// </summary>
/// <param name="itemName">The name of the new <see cref="QueryModel"/>'s <see cref="FromClauseBase.ItemName"/>.</param>
/// <returns>A new <see cref="QueryModel"/> whose <see cref="MainFromClause"/>'s <see cref="FromClauseBase.FromExpression"/> is a
/// <see cref="SubQueryExpression"/> that holds this <see cref="QueryModel"/> instance.</returns>
public QueryModel ConvertToSubQuery (string itemName)
{
ArgumentUtility.CheckNotNullOrEmpty ("itemName", itemName);
var outputDataInfo = GetOutputDataInfo() as StreamedSequenceInfo;
if (outputDataInfo == null)
{
var message = string.Format (
"The query must return a sequence of items, but it selects a single object of type '{0}'.",
GetOutputDataInfo ().DataType);
throw new InvalidOperationException (message);
}
// from x in (sourceItemQuery)
// select x
var mainFromClause = new MainFromClause (
itemName,
outputDataInfo.ResultItemType,
new SubQueryExpression (this));
var selectClause = new SelectClause (new QuerySourceReferenceExpression (mainFromClause));
return new QueryModel (mainFromClause, selectClause);
}
