26 lines
657 B
C#
26 lines
657 B
C#
using System;
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using System.Collections.Generic;
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using System.Text;
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namespace System.Data.Linq.SqlClient {
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/// <summary>
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/// Walk a tree and return the set of unique aliases it produces.
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/// </summary>
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class SqlGatherProducedAliases {
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internal static HashSet<SqlAlias> Gather(SqlNode node) {
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Gatherer g = new Gatherer();
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g.Visit(node);
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return g.Produced;
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}
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private class Gatherer : SqlVisitor {
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internal HashSet<SqlAlias> Produced = new HashSet<SqlAlias>();
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internal override SqlAlias VisitAlias(SqlAlias a) {
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Produced.Add(a);
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return base.VisitAlias(a);
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}
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}
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}
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}
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