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using System;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Reflection;
using System.Data.Linq;
using System.Data.Linq.Provider;
using System.Linq;
namespace System.Data.Linq.SqlClient {
internal class SqlTopReducer {
internal static SqlNode Reduce(SqlNode node, SqlNodeAnnotations annotations, SqlFactory sql) {
return new Visitor(annotations, sql).Visit(node);
}
class Visitor : SqlVisitor {
SqlNodeAnnotations annotations;
SqlFactory sql;
internal Visitor(SqlNodeAnnotations annotations, SqlFactory sql) {
this.annotations = annotations;
this.sql = sql;
}
internal override SqlSelect VisitSelect(SqlSelect select) {
base.VisitSelect(select);
if (select.Top != null) {
if (select.Top.NodeType == SqlNodeType.Value) {
SqlValue val = (SqlValue)select.Top;
// convert to literal value for SQL2K compatibility
if (val.IsClientSpecified) {
select.Top = sql.Value(val.ClrType, val.SqlType, val.Value, false, val.SourceExpression);
}
}
else {
// cannot be converted to literal value. note that this select is not SQL2K compatible
this.annotations.Add(select.Top, new SqlServerCompatibilityAnnotation(Strings.SourceExpressionAnnotation(select.Top.SourceExpression), SqlProvider.ProviderMode.Sql2000));
}
}
return select;
}
}
}
}
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