SqlMultiplexer.cs source code in C# .NET

                        
Code:
                         / 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DLinq / Dlinq / SqlClient / Query / SqlMultiplexer.cs / 1305376 / SqlMultiplexer.cs
                        

                        
                            using System; 
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Data.Linq;
 
namespace System.Data.Linq.SqlClient {
 
    // convert multiset & element expressions into separate queries 

    internal class SqlMultiplexer { 
        Visitor visitor;

        internal enum Options {
            None, 
            EnableBigJoin
        } 
 
        internal SqlMultiplexer(Options options, IEnumerable parentParameters, SqlFactory sqlFactory) {
            this.visitor = new Visitor(options, parentParameters, sqlFactory); 
        }

        internal SqlNode Multiplex(SqlNode node) {
            return this.visitor.Visit(node); 
        }
 
        class Visitor : SqlVisitor { 
            Options options;
            SqlFactory sql; 
            SqlSelect outerSelect;
            bool hasBigJoin;
            bool canJoin;
            bool isTopLevel; 
            IEnumerable parentParameters;
 
            internal Visitor(Options options, IEnumerable parentParameters, SqlFactory sqlFactory) { 
                this.options = options;
                this.sql = sqlFactory; 
                this.canJoin = true;
                this.isTopLevel = true;
                this.parentParameters = parentParameters;
            } 

            internal override SqlExpression VisitMultiset(SqlSubSelect sms) { 
                // allow one big-join per query? 
                if ((this.options & Options.EnableBigJoin) != 0 &&
                    !this.hasBigJoin && this.canJoin && this.isTopLevel && this.outerSelect != null 
                    && !MultisetChecker.HasMultiset(sms.Select.Selection)
                    && BigJoinChecker.CanBigJoin(sms.Select)) {

                    sms.Select = this.VisitSelect(sms.Select); 

                    SqlAlias alias = new SqlAlias(sms.Select); 
                    SqlJoin join = new SqlJoin(SqlJoinType.OuterApply, this.outerSelect.From, alias, null, sms.SourceExpression); 
                    this.outerSelect.From = join;
                    this.outerSelect.OrderingType = SqlOrderingType.Always; 

                    // make joined expression
                    SqlExpression expr = (SqlExpression)SqlDuplicator.Copy(sms.Select.Selection);
 
                    // make count expression
                    SqlSelect copySelect = (SqlSelect)SqlDuplicator.Copy(sms.Select); 
                    SqlAlias copyAlias = new SqlAlias(copySelect); 
                    SqlSelect countSelect = new SqlSelect(sql.Unary(SqlNodeType.Count, null, sms.SourceExpression), copyAlias, sms.SourceExpression);
                    countSelect.OrderingType = SqlOrderingType.Never; 
                    SqlExpression count = sql.SubSelect(SqlNodeType.ScalarSubSelect, countSelect);

                    // make joined collection
                    SqlJoinedCollection jc = new SqlJoinedCollection(sms.ClrType, sms.SqlType, expr, count, sms.SourceExpression); 
                    this.hasBigJoin = true;
                    return jc; 
                } 
                else {
                    return QueryExtractor.Extract(sms, this.parentParameters); 
                }
            }

            internal override SqlExpression VisitElement(SqlSubSelect elem) { 
                return QueryExtractor.Extract(elem, this.parentParameters);
            } 
 
            internal override SqlExpression VisitScalarSubSelect(SqlSubSelect ss) {
                bool saveIsTopLevel = this.isTopLevel; 
                this.isTopLevel = false;
                bool saveCanJoin = this.canJoin;
                this.canJoin = false;
                try { 
                    return base.VisitScalarSubSelect(ss);
                } 
                finally { 
                    this.isTopLevel = saveIsTopLevel;
                    this.canJoin = saveCanJoin; 
                }
            }

            internal override SqlExpression VisitExists(SqlSubSelect ss) { 
                bool saveIsTopLevel = this.isTopLevel;
                this.isTopLevel = false; 
                bool saveCanJoin = this.canJoin; 
                this.canJoin = false;
                try { 
                    return base.VisitExists(ss);
                }
                finally {
                    this.isTopLevel = saveIsTopLevel; 
                    this.canJoin = saveCanJoin;
                } 
            } 

            internal override SqlSelect VisitSelect(SqlSelect select) { 
                SqlSelect saveSelect = this.outerSelect;
                this.outerSelect = select;

                // big-joins may need to lift PK's out for default ordering, so don't allow big-join if we see these 
                this.canJoin &= select.GroupBy.Count == 0 && select.Top == null && !select.IsDistinct;
 
                bool saveIsTopLevel = this.isTopLevel; 
                this.isTopLevel = false;
 
                select = this.VisitSelectCore(select);

                this.isTopLevel = saveIsTopLevel;
                select.Selection = this.VisitExpression(select.Selection); 

                this.isTopLevel = saveIsTopLevel; 
                this.outerSelect = saveSelect; 

                if (select.IsDistinct && HierarchyChecker.HasHierarchy(select.Selection)) { 
                    // distinct across heirarchy is a NO-OP
                    select.IsDistinct = false;
                }
                return select; 
            }
 
            internal override SqlNode VisitUnion(SqlUnion su) { 
                this.canJoin = false;
                return base.VisitUnion(su); 
            }

            internal override SqlExpression VisitClientCase(SqlClientCase c) {
                bool saveCanJoin = this.canJoin; 
                this.canJoin = false;
                try { 
                    return base.VisitClientCase(c); 
                }
                finally { 
                    this.canJoin = saveCanJoin;
                }
            }
 
            internal override SqlExpression VisitSimpleCase(SqlSimpleCase c) {
                bool saveCanJoin = this.canJoin; 
                this.canJoin = false; 
                try {
                    return base.VisitSimpleCase(c); 
                }
                finally {
                    this.canJoin = saveCanJoin;
                } 
            }
 
            internal override SqlExpression VisitSearchedCase(SqlSearchedCase c) { 
                bool saveCanJoin = this.canJoin;
                this.canJoin = false; 
                try {
                    return base.VisitSearchedCase(c);
                }
                finally { 
                    this.canJoin = saveCanJoin;
                } 
            } 

            internal override SqlExpression VisitTypeCase(SqlTypeCase tc) { 
                bool saveCanJoin = this.canJoin;
                this.canJoin = false;
                try {
                    return base.VisitTypeCase(tc); 
                }
                finally { 
                    this.canJoin = saveCanJoin; 
                }
            } 

            internal override SqlExpression VisitOptionalValue(SqlOptionalValue sov) {
                bool saveCanJoin = this.canJoin;
                this.canJoin = false; 
                try {
                    return base.VisitOptionalValue(sov); 
                } 
                finally {
                    this.canJoin = saveCanJoin; 
                }
            }

            internal override SqlUserQuery VisitUserQuery(SqlUserQuery suq) { 
                this.canJoin = false;
                return base.VisitUserQuery(suq); 
            } 
        }
    } 

    internal class QueryExtractor {

        internal static SqlClientQuery Extract(SqlSubSelect subquery, IEnumerable parentParameters) { 
            SqlClientQuery cq = new SqlClientQuery(subquery);
            if (parentParameters != null) { 
                cq.Parameters.AddRange(parentParameters); 
            }
            Visitor v = new Visitor(cq.Arguments, cq.Parameters); 
            cq.Query = (SqlSubSelect)v.Visit(subquery);
            return cq;
        }
 
        class Visitor : SqlDuplicator.DuplicatingVisitor {
            List externals; 
            List parameters; 

            internal Visitor(List externals, List parameters) 
                : base(true) {
                this.externals = externals;
                this.parameters = parameters;
            } 

            internal override SqlExpression VisitColumnRef(SqlColumnRef cref) { 
                SqlExpression result = base.VisitColumnRef(cref); 
                if (result == cref) { // must be external
                    return ExtractParameter(result); 
                }
                return result;
            }
 
            internal override SqlExpression VisitUserColumn(SqlUserColumn suc) {
                SqlExpression result = base.VisitUserColumn(suc); 
                if (result == suc) { // must be external 
                    return ExtractParameter(result);
                } 
                return result;
            }

            private SqlExpression ExtractParameter(SqlExpression expr) { 
                Type clrType = expr.ClrType;
                if (expr.ClrType.IsValueType && !TypeSystem.IsNullableType(expr.ClrType)) { 
                    clrType = typeof(Nullable<>).MakeGenericType(expr.ClrType); 
                }
                this.externals.Add(expr); 
                SqlParameter sp = new SqlParameter(clrType, expr.SqlType, "@x" + (this.parameters.Count + 1), expr.SourceExpression);
                this.parameters.Add(sp);
                return sp;
            } 

            internal override SqlNode VisitLink(SqlLink link) { 
                // Don't visit the Expression/Expansion for this link. 
                // Any additional external refs in these expressions
                // should be ignored 
                SqlExpression[] exprs = new SqlExpression[link.KeyExpressions.Count];
                for (int i = 0, n = exprs.Length; i < n; i++) {
                    exprs[i] = this.VisitExpression(link.KeyExpressions[i]);
                } 
                return new SqlLink(new object(), link.RowType, link.ClrType, link.SqlType, null, link.Member, exprs, null, link.SourceExpression);
            } 
        } 
    }
 
    internal class HierarchyChecker {
        internal static bool HasHierarchy(SqlExpression expr) {
            Visitor v = new Visitor();
            v.Visit(expr); 
            return v.foundHierarchy;
        } 
 
        class Visitor : SqlVisitor {
            internal bool foundHierarchy; 

            internal override SqlExpression VisitMultiset(SqlSubSelect sms) {
                this.foundHierarchy = true;
                return sms; 
            }
 
            internal override SqlExpression VisitElement(SqlSubSelect elem) { 
                this.foundHierarchy = true;
                return elem; 
            }

            internal override SqlExpression VisitClientQuery(SqlClientQuery cq) {
                this.foundHierarchy = true; 
                return cq;
            } 
 
            internal override SqlExpression VisitExists(SqlSubSelect ss) {
                return ss; 
            }

            internal override SqlExpression VisitScalarSubSelect(SqlSubSelect ss) {
                return ss; 
            }
        } 
    } 

    internal class MultisetChecker { 
        internal static bool HasMultiset(SqlExpression expr) {
            Visitor v = new Visitor();
            v.Visit(expr);
            return v.foundMultiset; 
        }
 
        class Visitor : SqlVisitor { 
            internal bool foundMultiset;
 
            internal override SqlExpression VisitMultiset(SqlSubSelect sms) {
                this.foundMultiset = true;
                return sms;
            } 

            internal override SqlExpression VisitElement(SqlSubSelect elem) { 
                return elem; 
            }
 
            internal override SqlExpression VisitClientQuery(SqlClientQuery cq) {
                return cq;
            }
 
            internal override SqlExpression VisitExists(SqlSubSelect ss) {
                return ss; 
            } 

            internal override SqlExpression VisitScalarSubSelect(SqlSubSelect ss) { 
                return ss;
            }
        }
    } 

    internal class BigJoinChecker { 
        internal static bool CanBigJoin(SqlSelect select) { 
            Visitor v = new Visitor();
            v.Visit(select); 
            return v.canBigJoin;
        }

        class Visitor : SqlVisitor { 
            internal bool canBigJoin = true;
 
            internal override SqlExpression VisitMultiset(SqlSubSelect sms) { 
                return sms;
            } 

            internal override SqlExpression VisitElement(SqlSubSelect elem) {
                return elem;
            } 

            internal override SqlExpression VisitClientQuery(SqlClientQuery cq) { 
                return cq; 
            }
 
            internal override SqlExpression VisitExists(SqlSubSelect ss) {
                return ss;
            }
 
            internal override SqlExpression VisitScalarSubSelect(SqlSubSelect ss) {
                return ss; 
            } 

            internal override SqlSelect VisitSelect(SqlSelect select) { 
                // big-joins may need to lift PK's out for default ordering, so don't allow big-join if we see these
                this.canBigJoin &= select.GroupBy.Count == 0 && select.Top == null && !select.IsDistinct;
                if (!this.canBigJoin) {
                    return select; 
                }
                return base.VisitSelect(select); 
            } 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
using System; 
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Data.Linq;
 
namespace System.Data.Linq.SqlClient {
 
    // convert multiset & element expressions into separate queries 

    internal class SqlMultiplexer { 
        Visitor visitor;

        internal enum Options {
            None, 
            EnableBigJoin
        } 
 
        internal SqlMultiplexer(Options options, IEnumerable parentParameters, SqlFactory sqlFactory) {
            this.visitor = new Visitor(options, parentParameters, sqlFactory); 
        }

        internal SqlNode Multiplex(SqlNode node) {
            return this.visitor.Visit(node); 
        }
 
        class Visitor : SqlVisitor { 
            Options options;
            SqlFactory sql; 
            SqlSelect outerSelect;
            bool hasBigJoin;
            bool canJoin;
            bool isTopLevel; 
            IEnumerable parentParameters;
 
            internal Visitor(Options options, IEnumerable parentParameters, SqlFactory sqlFactory) { 
                this.options = options;
                this.sql = sqlFactory; 
                this.canJoin = true;
                this.isTopLevel = true;
                this.parentParameters = parentParameters;
            } 

            internal override SqlExpression VisitMultiset(SqlSubSelect sms) { 
                // allow one big-join per query? 
                if ((this.options & Options.EnableBigJoin) != 0 &&
                    !this.hasBigJoin && this.canJoin && this.isTopLevel && this.outerSelect != null 
                    && !MultisetChecker.HasMultiset(sms.Select.Selection)
                    && BigJoinChecker.CanBigJoin(sms.Select)) {

                    sms.Select = this.VisitSelect(sms.Select); 

                    SqlAlias alias = new SqlAlias(sms.Select); 
                    SqlJoin join = new SqlJoin(SqlJoinType.OuterApply, this.outerSelect.From, alias, null, sms.SourceExpression); 
                    this.outerSelect.From = join;
                    this.outerSelect.OrderingType = SqlOrderingType.Always; 

                    // make joined expression
                    SqlExpression expr = (SqlExpression)SqlDuplicator.Copy(sms.Select.Selection);
 
                    // make count expression
                    SqlSelect copySelect = (SqlSelect)SqlDuplicator.Copy(sms.Select); 
                    SqlAlias copyAlias = new SqlAlias(copySelect); 
                    SqlSelect countSelect = new SqlSelect(sql.Unary(SqlNodeType.Count, null, sms.SourceExpression), copyAlias, sms.SourceExpression);
                    countSelect.OrderingType = SqlOrderingType.Never; 
                    SqlExpression count = sql.SubSelect(SqlNodeType.ScalarSubSelect, countSelect);

                    // make joined collection
                    SqlJoinedCollection jc = new SqlJoinedCollection(sms.ClrType, sms.SqlType, expr, count, sms.SourceExpression); 
                    this.hasBigJoin = true;
                    return jc; 
                } 
                else {
                    return QueryExtractor.Extract(sms, this.parentParameters); 
                }
            }

            internal override SqlExpression VisitElement(SqlSubSelect elem) { 
                return QueryExtractor.Extract(elem, this.parentParameters);
            } 
 
            internal override SqlExpression VisitScalarSubSelect(SqlSubSelect ss) {
                bool saveIsTopLevel = this.isTopLevel; 
                this.isTopLevel = false;
                bool saveCanJoin = this.canJoin;
                this.canJoin = false;
                try { 
                    return base.VisitScalarSubSelect(ss);
                } 
                finally { 
                    this.isTopLevel = saveIsTopLevel;
                    this.canJoin = saveCanJoin; 
                }
            }

            internal override SqlExpression VisitExists(SqlSubSelect ss) { 
                bool saveIsTopLevel = this.isTopLevel;
                this.isTopLevel = false; 
                bool saveCanJoin = this.canJoin; 
                this.canJoin = false;
                try { 
                    return base.VisitExists(ss);
                }
                finally {
                    this.isTopLevel = saveIsTopLevel; 
                    this.canJoin = saveCanJoin;
                } 
            } 

            internal override SqlSelect VisitSelect(SqlSelect select) { 
                SqlSelect saveSelect = this.outerSelect;
                this.outerSelect = select;

                // big-joins may need to lift PK's out for default ordering, so don't allow big-join if we see these 
                this.canJoin &= select.GroupBy.Count == 0 && select.Top == null && !select.IsDistinct;
 
                bool saveIsTopLevel = this.isTopLevel; 
                this.isTopLevel = false;
 
                select = this.VisitSelectCore(select);

                this.isTopLevel = saveIsTopLevel;
                select.Selection = this.VisitExpression(select.Selection); 

                this.isTopLevel = saveIsTopLevel; 
                this.outerSelect = saveSelect; 

                if (select.IsDistinct && HierarchyChecker.HasHierarchy(select.Selection)) { 
                    // distinct across heirarchy is a NO-OP
                    select.IsDistinct = false;
                }
                return select; 
            }
 
            internal override SqlNode VisitUnion(SqlUnion su) { 
                this.canJoin = false;
                return base.VisitUnion(su); 
            }

            internal override SqlExpression VisitClientCase(SqlClientCase c) {
                bool saveCanJoin = this.canJoin; 
                this.canJoin = false;
                try { 
                    return base.VisitClientCase(c); 
                }
                finally { 
                    this.canJoin = saveCanJoin;
                }
            }
 
            internal override SqlExpression VisitSimpleCase(SqlSimpleCase c) {
                bool saveCanJoin = this.canJoin; 
                this.canJoin = false; 
                try {
                    return base.VisitSimpleCase(c); 
                }
                finally {
                    this.canJoin = saveCanJoin;
                } 
            }
 
            internal override SqlExpression VisitSearchedCase(SqlSearchedCase c) { 
                bool saveCanJoin = this.canJoin;
                this.canJoin = false; 
                try {
                    return base.VisitSearchedCase(c);
                }
                finally { 
                    this.canJoin = saveCanJoin;
                } 
            } 

            internal override SqlExpression VisitTypeCase(SqlTypeCase tc) { 
                bool saveCanJoin = this.canJoin;
                this.canJoin = false;
                try {
                    return base.VisitTypeCase(tc); 
                }
                finally { 
                    this.canJoin = saveCanJoin; 
                }
            } 

            internal override SqlExpression VisitOptionalValue(SqlOptionalValue sov) {
                bool saveCanJoin = this.canJoin;
                this.canJoin = false; 
                try {
                    return base.VisitOptionalValue(sov); 
                } 
                finally {
                    this.canJoin = saveCanJoin; 
                }
            }

            internal override SqlUserQuery VisitUserQuery(SqlUserQuery suq) { 
                this.canJoin = false;
                return base.VisitUserQuery(suq); 
            } 
        }
    } 

    internal class QueryExtractor {

        internal static SqlClientQuery Extract(SqlSubSelect subquery, IEnumerable parentParameters) { 
            SqlClientQuery cq = new SqlClientQuery(subquery);
            if (parentParameters != null) { 
                cq.Parameters.AddRange(parentParameters); 
            }
            Visitor v = new Visitor(cq.Arguments, cq.Parameters); 
            cq.Query = (SqlSubSelect)v.Visit(subquery);
            return cq;
        }
 
        class Visitor : SqlDuplicator.DuplicatingVisitor {
            List externals; 
            List parameters; 

            internal Visitor(List externals, List parameters) 
                : base(true) {
                this.externals = externals;
                this.parameters = parameters;
            } 

            internal override SqlExpression VisitColumnRef(SqlColumnRef cref) { 
                SqlExpression result = base.VisitColumnRef(cref); 
                if (result == cref) { // must be external
                    return ExtractParameter(result); 
                }
                return result;
            }
 
            internal override SqlExpression VisitUserColumn(SqlUserColumn suc) {
                SqlExpression result = base.VisitUserColumn(suc); 
                if (result == suc) { // must be external 
                    return ExtractParameter(result);
                } 
                return result;
            }

            private SqlExpression ExtractParameter(SqlExpression expr) { 
                Type clrType = expr.ClrType;
                if (expr.ClrType.IsValueType && !TypeSystem.IsNullableType(expr.ClrType)) { 
                    clrType = typeof(Nullable<>).MakeGenericType(expr.ClrType); 
                }
                this.externals.Add(expr); 
                SqlParameter sp = new SqlParameter(clrType, expr.SqlType, "@x" + (this.parameters.Count + 1), expr.SourceExpression);
                this.parameters.Add(sp);
                return sp;
            } 

            internal override SqlNode VisitLink(SqlLink link) { 
                // Don't visit the Expression/Expansion for this link. 
                // Any additional external refs in these expressions
                // should be ignored 
                SqlExpression[] exprs = new SqlExpression[link.KeyExpressions.Count];
                for (int i = 0, n = exprs.Length; i < n; i++) {
                    exprs[i] = this.VisitExpression(link.KeyExpressions[i]);
                } 
                return new SqlLink(new object(), link.RowType, link.ClrType, link.SqlType, null, link.Member, exprs, null, link.SourceExpression);
            } 
        } 
    }
 
    internal class HierarchyChecker {
        internal static bool HasHierarchy(SqlExpression expr) {
            Visitor v = new Visitor();
            v.Visit(expr); 
            return v.foundHierarchy;
        } 
 
        class Visitor : SqlVisitor {
            internal bool foundHierarchy; 

            internal override SqlExpression VisitMultiset(SqlSubSelect sms) {
                this.foundHierarchy = true;
                return sms; 
            }
 
            internal override SqlExpression VisitElement(SqlSubSelect elem) { 
                this.foundHierarchy = true;
                return elem; 
            }

            internal override SqlExpression VisitClientQuery(SqlClientQuery cq) {
                this.foundHierarchy = true; 
                return cq;
            } 
 
            internal override SqlExpression VisitExists(SqlSubSelect ss) {
                return ss; 
            }

            internal override SqlExpression VisitScalarSubSelect(SqlSubSelect ss) {
                return ss; 
            }
        } 
    } 

    internal class MultisetChecker { 
        internal static bool HasMultiset(SqlExpression expr) {
            Visitor v = new Visitor();
            v.Visit(expr);
            return v.foundMultiset; 
        }
 
        class Visitor : SqlVisitor { 
            internal bool foundMultiset;
 
            internal override SqlExpression VisitMultiset(SqlSubSelect sms) {
                this.foundMultiset = true;
                return sms;
            } 

            internal override SqlExpression VisitElement(SqlSubSelect elem) { 
                return elem; 
            }
 
            internal override SqlExpression VisitClientQuery(SqlClientQuery cq) {
                return cq;
            }
 
            internal override SqlExpression VisitExists(SqlSubSelect ss) {
                return ss; 
            } 

            internal override SqlExpression VisitScalarSubSelect(SqlSubSelect ss) { 
                return ss;
            }
        }
    } 

    internal class BigJoinChecker { 
        internal static bool CanBigJoin(SqlSelect select) { 
            Visitor v = new Visitor();
            v.Visit(select); 
            return v.canBigJoin;
        }

        class Visitor : SqlVisitor { 
            internal bool canBigJoin = true;
 
            internal override SqlExpression VisitMultiset(SqlSubSelect sms) { 
                return sms;
            } 

            internal override SqlExpression VisitElement(SqlSubSelect elem) {
                return elem;
            } 

            internal override SqlExpression VisitClientQuery(SqlClientQuery cq) { 
                return cq; 
            }
 
            internal override SqlExpression VisitExists(SqlSubSelect ss) {
                return ss;
            }
 
            internal override SqlExpression VisitScalarSubSelect(SqlSubSelect ss) {
                return ss; 
            } 

            internal override SqlSelect VisitSelect(SqlSelect select) { 
                // big-joins may need to lift PK's out for default ordering, so don't allow big-join if we see these
                this.canBigJoin &= select.GroupBy.Count == 0 && select.Top == null && !select.IsDistinct;
                if (!this.canBigJoin) {
                    return select; 
                }
                return base.VisitSelect(select); 
            } 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

                        

                        

                        
                        

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