using System; using System.Collections; using System.Collections.Generic; using System.Linq; using System.Linq.Expressions; namespace Signum.Engine.Linq { /// <summary> /// returns the set of all aliases produced by a query source /// </summary> internal class AliasGatherer : DbExpressionVisitor { HashSet<Alias> aliases = new HashSet<Alias>(); private AliasGatherer() { } public static HashSet<Alias> Gather(Expression source) { AliasGatherer ap = new AliasGatherer(); ap.Visit(source); return ap.aliases; } protected override Expression VisitSelect(SelectExpression select) { this.aliases.Add(select.Alias); return base.VisitSelect(select); } protected override Expression VisitTable(TableExpression table) { this.aliases.Add(table.Alias); return base.VisitTable(table); } } }
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