VarInfo.cs source code in C# .NET

                        Code:
                         / Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / ndp / fx / src / DataEntity / System / Data / Query / PlanCompiler / VarInfo.cs / 1 / VarInfo.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....], [....]
//--------------------------------------------------------------------- 
 
using System;
using System.Collections.Generic; 
//using System.Diagnostics; // Please use PlanCompiler.Assert instead of Debug.Assert in this class...
using System.Globalization;

using System.Data.Common; 
using md = System.Data.Metadata.Edm;
using System.Data.Query.InternalTrees; 
using System.Data.Query.PlanCompiler; 

namespace System.Data.Query.PlanCompiler { 

    /// 
    /// Information about a Var and its replacement
    ///  
    internal abstract class VarInfo {
 
        ///  
        /// Does this VarInfo represent a structured type
        ///  
        internal virtual bool IsStructuredType { get { return false; } }

        /// 
        /// Does this VarInfo represent a collection type 
        /// 
        internal virtual bool IsCollectionType { get { return false; } } 
 
        /// 
        /// Get the list of new Vars introduced by this VarInfo 
        /// 
        internal virtual List NewVars { get { return null; } }
    }
 
    /// 
    /// Represents information about a collection typed Var. 
    /// Each such Var is replaced by a Var with a new "mapped" type - the "mapped" type 
    /// is simply a collection type where the element type has been "mapped"
    ///  
    internal class CollectionVarInfo : VarInfo {
        private List m_newVars; // always a singleton list

        ///  
        /// Create a CollectionVarInfo
        ///  
        ///  
        internal CollectionVarInfo(Var newVar) {
            m_newVars = new List(); 
            m_newVars.Add(newVar);
        }

        ///  
        /// Get the newVar
        ///  
        internal Var NewVar { get { return m_newVars[0]; } } 

        ///  
        /// This is for a collection-type Var
        /// 
        internal override bool IsCollectionType { get { return true; } }
 
        /// 
        /// Get the list of all NewVars - just one really 
        ///  
        internal override List NewVars { get { return m_newVars; } }
    } 

    /// 
    /// The StructuredVarInfo class contains information about a structured type Var
    /// and how it can be replaced. This is targeted towards Vars of complex/record/ 
    /// entity/ref types, and the goal is to replace all such Vars in this module.
    ///  
    internal class StructuredVarInfo : VarInfo { 

        private Dictionary m_propertyToVarMap; 
        List m_newVars;
        List m_newProperties;
        md.RowType m_newType;
        md.TypeUsage m_newTypeUsage; 

        ///  
        /// Constructor 
        /// 
        /// new "flat" record type corresponding to the Var's datatype 
        /// List of vars to replace current Var
        /// List of properties in the "flat" record type
        internal StructuredVarInfo(md.RowType newType, List newVars, List newTypeProperties) {
            PlanCompiler.Assert(newVars.Count == newTypeProperties.Count, "count mismatch"); 
            // I see a few places where this is legal
            // PlanCompiler.Assert(newVars.Count > 0, "0 vars?"); 
            m_newVars = newVars; 
            m_newProperties = newTypeProperties;
            m_newType = newType; 
            m_newTypeUsage = md.TypeUsage.Create(newType);
        }

        ///  
        /// This VarInfo represents a structured type
        ///  
        internal override bool IsStructuredType { get { return true; } } 

        ///  
        /// The NewVars property of the VarInfo is a list of the corresponding
        /// "scalar" Vars that can be used to replace the current Var. This is
        /// mainly intended for use by other RelOps that maintain lists of Vars
        /// - for example, the "Vars" property of ProjectOp and other similar 
        /// locations.
        ///  
        internal override List NewVars { get { return m_newVars; } } 

        ///  
        /// The Fields property is matched 1-1 with the NewVars property, and
        /// specifies the properties of the record type corresponding to the
        /// original VarType
        ///  
        internal List Fields { get { return m_newProperties; } }
 
        ///  
        /// Get the Var corresponding to a specific property
        ///  
        /// the requested property
        /// the corresponding Var
        /// true, if the Var was found
        internal bool TryGetVar(md.EdmProperty p, out Var v) { 
            if (m_propertyToVarMap == null) {
                InitPropertyToVarMap(); 
            } 
            return m_propertyToVarMap.TryGetValue(p, out v);
        } 

        /// 
        /// The NewType property describes the new "flattened" record type
        /// that is a replacement for the original type of the Var 
        /// 
        internal md.RowType NewType { get { return m_newType; } } 
 
        /// 
        /// Returns the NewType wrapped in a TypeUsage 
        /// 
        internal md.TypeUsage NewTypeUsage { get { return m_newTypeUsage; } }

        ///  
        /// Initialize mapping from properties to the corresponding Var
        ///  
        private void InitPropertyToVarMap() { 
            if (m_propertyToVarMap == null) {
                m_propertyToVarMap = new Dictionary(); 
                IEnumerator newVarEnumerator = m_newVars.GetEnumerator();
                foreach (md.EdmProperty prop in m_newProperties) {
                    newVarEnumerator.MoveNext();
                    m_propertyToVarMap.Add(prop, newVarEnumerator.Current); 
                }
                newVarEnumerator.Dispose(); 
            } 
        }
    } 

    /// 
    /// The VarInfo map maintains a mapping from Vars to their corresponding VarInfo
    /// It is logically a Dictionary 
    /// 
    internal class VarInfoMap { 
        private Dictionary m_map; 

        ///  
        /// Default constructor
        /// 
        internal VarInfoMap() {
            m_map = new Dictionary(); 
        }
 
        ///  
        /// Create a new VarInfo for a structured type Var
        ///  
        /// The structured type Var
        /// "Mapped" type for v
        /// List of vars corresponding to v
        /// Flattened Properties  
        /// the VarInfo
        internal VarInfo CreateStructuredVarInfo(Var v, md.RowType newType, List newVars, List newProperties) { 
            VarInfo varInfo = new StructuredVarInfo(newType, newVars, newProperties); 
            m_map.Add(v, varInfo);
            return varInfo; 
        }

        /// 
        /// Create a VarInfo for a collection typed Var 
        /// 
        /// The collection-typed Var 
        /// the new Var 
        /// the VarInfo
        internal VarInfo CreateCollectionVarInfo(Var v, Var newVar) { 
            VarInfo varInfo = new CollectionVarInfo(newVar);
            m_map.Add(v, varInfo);
            return varInfo;
        } 

        ///  
        /// Return the VarInfo for the specified var (if one exists, of course) 
        /// 
        /// The Var 
        /// the corresponding VarInfo
        /// 
        internal bool TryGetVarInfo(Var v, out VarInfo varInfo) {
            return m_map.TryGetValue(v, out varInfo); 
        }
    } 
 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....], [....]
//--------------------------------------------------------------------- 
 
using System;
using System.Collections.Generic; 
//using System.Diagnostics; // Please use PlanCompiler.Assert instead of Debug.Assert in this class...
using System.Globalization;

using System.Data.Common; 
using md = System.Data.Metadata.Edm;
using System.Data.Query.InternalTrees; 
using System.Data.Query.PlanCompiler; 

namespace System.Data.Query.PlanCompiler { 

    /// 
    /// Information about a Var and its replacement
    ///  
    internal abstract class VarInfo {
 
        ///  
        /// Does this VarInfo represent a structured type
        ///  
        internal virtual bool IsStructuredType { get { return false; } }

        /// 
        /// Does this VarInfo represent a collection type 
        /// 
        internal virtual bool IsCollectionType { get { return false; } } 
 
        /// 
        /// Get the list of new Vars introduced by this VarInfo 
        /// 
        internal virtual List NewVars { get { return null; } }
    }
 
    /// 
    /// Represents information about a collection typed Var. 
    /// Each such Var is replaced by a Var with a new "mapped" type - the "mapped" type 
    /// is simply a collection type where the element type has been "mapped"
    ///  
    internal class CollectionVarInfo : VarInfo {
        private List m_newVars; // always a singleton list

        ///  
        /// Create a CollectionVarInfo
        ///  
        ///  
        internal CollectionVarInfo(Var newVar) {
            m_newVars = new List(); 
            m_newVars.Add(newVar);
        }

        ///  
        /// Get the newVar
        ///  
        internal Var NewVar { get { return m_newVars[0]; } } 

        ///  
        /// This is for a collection-type Var
        /// 
        internal override bool IsCollectionType { get { return true; } }
 
        /// 
        /// Get the list of all NewVars - just one really 
        ///  
        internal override List NewVars { get { return m_newVars; } }
    } 

    /// 
    /// The StructuredVarInfo class contains information about a structured type Var
    /// and how it can be replaced. This is targeted towards Vars of complex/record/ 
    /// entity/ref types, and the goal is to replace all such Vars in this module.
    ///  
    internal class StructuredVarInfo : VarInfo { 

        private Dictionary m_propertyToVarMap; 
        List m_newVars;
        List m_newProperties;
        md.RowType m_newType;
        md.TypeUsage m_newTypeUsage; 

        ///  
        /// Constructor 
        /// 
        /// new "flat" record type corresponding to the Var's datatype 
        /// List of vars to replace current Var
        /// List of properties in the "flat" record type
        internal StructuredVarInfo(md.RowType newType, List newVars, List newTypeProperties) {
            PlanCompiler.Assert(newVars.Count == newTypeProperties.Count, "count mismatch"); 
            // I see a few places where this is legal
            // PlanCompiler.Assert(newVars.Count > 0, "0 vars?"); 
            m_newVars = newVars; 
            m_newProperties = newTypeProperties;
            m_newType = newType; 
            m_newTypeUsage = md.TypeUsage.Create(newType);
        }

        ///  
        /// This VarInfo represents a structured type
        ///  
        internal override bool IsStructuredType { get { return true; } } 

        ///  
        /// The NewVars property of the VarInfo is a list of the corresponding
        /// "scalar" Vars that can be used to replace the current Var. This is
        /// mainly intended for use by other RelOps that maintain lists of Vars
        /// - for example, the "Vars" property of ProjectOp and other similar 
        /// locations.
        ///  
        internal override List NewVars { get { return m_newVars; } } 

        ///  
        /// The Fields property is matched 1-1 with the NewVars property, and
        /// specifies the properties of the record type corresponding to the
        /// original VarType
        ///  
        internal List Fields { get { return m_newProperties; } }
 
        ///  
        /// Get the Var corresponding to a specific property
        ///  
        /// the requested property
        /// the corresponding Var
        /// true, if the Var was found
        internal bool TryGetVar(md.EdmProperty p, out Var v) { 
            if (m_propertyToVarMap == null) {
                InitPropertyToVarMap(); 
            } 
            return m_propertyToVarMap.TryGetValue(p, out v);
        } 

        /// 
        /// The NewType property describes the new "flattened" record type
        /// that is a replacement for the original type of the Var 
        /// 
        internal md.RowType NewType { get { return m_newType; } } 
 
        /// 
        /// Returns the NewType wrapped in a TypeUsage 
        /// 
        internal md.TypeUsage NewTypeUsage { get { return m_newTypeUsage; } }

        ///  
        /// Initialize mapping from properties to the corresponding Var
        ///  
        private void InitPropertyToVarMap() { 
            if (m_propertyToVarMap == null) {
                m_propertyToVarMap = new Dictionary(); 
                IEnumerator newVarEnumerator = m_newVars.GetEnumerator();
                foreach (md.EdmProperty prop in m_newProperties) {
                    newVarEnumerator.MoveNext();
                    m_propertyToVarMap.Add(prop, newVarEnumerator.Current); 
                }
                newVarEnumerator.Dispose(); 
            } 
        }
    } 

    /// 
    /// The VarInfo map maintains a mapping from Vars to their corresponding VarInfo
    /// It is logically a Dictionary 
    /// 
    internal class VarInfoMap { 
        private Dictionary m_map; 

        ///  
        /// Default constructor
        /// 
        internal VarInfoMap() {
            m_map = new Dictionary(); 
        }
 
        ///  
        /// Create a new VarInfo for a structured type Var
        ///  
        /// The structured type Var
        /// "Mapped" type for v
        /// List of vars corresponding to v
        /// Flattened Properties  
        /// the VarInfo
        internal VarInfo CreateStructuredVarInfo(Var v, md.RowType newType, List newVars, List newProperties) { 
            VarInfo varInfo = new StructuredVarInfo(newType, newVars, newProperties); 
            m_map.Add(v, varInfo);
            return varInfo; 
        }

        /// 
        /// Create a VarInfo for a collection typed Var 
        /// 
        /// The collection-typed Var 
        /// the new Var 
        /// the VarInfo
        internal VarInfo CreateCollectionVarInfo(Var v, Var newVar) { 
            VarInfo varInfo = new CollectionVarInfo(newVar);
            m_map.Add(v, varInfo);
            return varInfo;
        } 

        ///  
        /// Return the VarInfo for the specified var (if one exists, of course) 
        /// 
        /// The Var 
        /// the corresponding VarInfo
        /// 
        internal bool TryGetVarInfo(Var v, out VarInfo varInfo) {
            return m_map.TryGetValue(v, out varInfo); 
        }
    } 
 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
VarInfo.cs source code in C# .NET

Source code for the .NET framework in C#

Code:

Link Menu
