JoinTreeSlot.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / ndp / fx / src / DataEntity / System / Data / Map / ViewGeneration / Structures / JoinTreeSlot.cs / 2 / JoinTreeSlot.cs
                        

                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System.Collections.Generic; 
using System.Text;
using System.Diagnostics;
using System.Data.Common.Utils;
using System.Data.Metadata.Edm; 
using System.Data.Mapping.ViewGeneration.CqlGeneration;
using System.Data.Mapping.ViewGeneration.Utils; 
 
namespace System.Data.Mapping.ViewGeneration.Structures {
 
    // A wrapper around JoinTreeNode that allows nodes to be stored as
    // ProjectedSlots
    internal class JoinTreeSlot : ProjectedSlot {
        #region Constructor 
        // effects: Creates a projected slot that references the relevant
        // jointree node (i.e., 
        internal JoinTreeSlot(JoinTreeNode node)  { 
            m_node = node;
        } 
        #endregion

        #region Fields
        // A comparer object for comparing jointree slots by MemberPaths 
        internal static readonly IEqualityComparer
                      SpecificEqualityComparer = new JoinTreeSlotEqualityComparer(); 
        private JoinTreeNode m_node; // The node that the var corresponds to 
        #endregion
 
        #region Properties
        // effects: Returns the join tree node corresponding to this variable
        internal JoinTreeNode JoinTreeNode {
            get { return m_node; } 
        }
 
        // effects: Returns the full metadata path from the root extent to 
        // this node, e.g., Person.Adrs.zip
        internal MemberPath MemberPath { 
            get { return m_node.MemberPath; }
        }
        #endregion
 
        #region Methods
        internal override StringBuilder AsCql(StringBuilder builder, MemberPath outputMember, 
                                              string blockAlias, int indentLevel) { 
            // Note: One might be tempted to use the Debug.Assert below; but
            // it is wrong: for query views, path is in SSpace and slotType 
            // is in CSpace since you are going from SSpace to CSpace
            // Debug.Assert(MemberPath.MemberType.Equals(slotType), "Type mismatch
            // of expected slot and member slot");
 
            // MemberPath's member type must be compatible with the outputMember Type.
            // Mapping must have already checked for this and hence we need to assert here. 
            // Today we can't put the debug assert since we require to access internal property 
            // in metadata and entitymapper is using this code, and hence fails to compile. Once
            // the entitymapper code is fixed to use the API's we can put this assert back 
            // CHANEG_[....]_


 
            // If memberpath's type and the outputmember type do not match,
            // we have to cast. We assume that the mapping loader has already 
            // checked that the casts are ok and emitted warnings 
            TypeUsage memberPathStoreTypeUsage = Helper.GetModelTypeUsage(MemberPath.LastMember);
            TypeUsage outputMemberStoreTypeUsage = Helper.GetModelTypeUsage(outputMember.LastMember); 

            if (false == memberPathStoreTypeUsage.EdmType.Equals(outputMemberStoreTypeUsage.EdmType)) {
                builder.Append("CAST(");
                MemberPath.AsCql(builder, blockAlias); 
                builder.Append(" AS ");
                CqlWriter.AppendEscapedTypeName(builder, outputMemberStoreTypeUsage.EdmType); 
                builder.Append(')'); 
            } else {
                MemberPath.AsCql(builder, blockAlias); 
            }
            return builder;
        }
 
        // effects: Given a slot and the new mapping, returns the
        // corresponding new slot 
        internal override ProjectedSlot RemapSlot(Dictionary remap) { 
            JoinTreeNode remappedNode = remap[JoinTreeNode];
            return new JoinTreeSlot(remappedNode); 
        }

        internal override void ToCompactString(StringBuilder builder) {
            m_node.ToCompactString(builder); 
        }
 
        internal string ToUserString() { 
            return m_node.MemberPath.PathToString(false);
        } 

        protected override bool IsEqualTo(ProjectedSlot right) {
            JoinTreeSlot rightSlot = right as JoinTreeSlot;
            if (rightSlot == null) { 
                return false;
            } 
            // We want equality of the paths 
            return MemberPath.EqualityComparer.Equals(m_node.MemberPath, rightSlot.m_node.MemberPath);
        } 

        protected override int GetHash() {
            return MemberPath.EqualityComparer.GetHashCode(m_node.MemberPath);
        } 
        #endregion
 
        #region Helper methods 
        // requires: prefix corresponds to an entity set or an association end
        // effects: Given the prefix, determines the slots in "slots" 
        // that correspond to the entity key for the entity set or the
        // association set end. Returns the list of slots.  Returns null if
        // even one of the key slots is not present in slots
        internal static List GetKeySlots(IEnumerable slots, MemberPath prefix) { 
            // Get the entity type of the hosted end or entity set
            EntitySet entitySet = prefix.EntitySet; 
 
            List keys = ExtentKey.GetKeysForEntityType(prefix, entitySet.ElementType);
            Debug.Assert(keys.Count > 0, "No keys for entity?"); 
            Debug.Assert(keys.Count == 1, "Currently, we only support primary keys");
            // Get the slots for the key
            List keySlots = GetSlots(slots, keys[0].KeyFields);
            return keySlots; 
        }
 
        // effects: Searches for members in slots and returns the 
        // corresponding slots in the same order as present in
        // members. Returns null if even one member is not present in slots 
        internal static List GetSlots(IEnumerable slots, IEnumerable members) {
            List result = new List();
            foreach (MemberPath member in members) {
                JoinTreeSlot slot = GetSlotForMember(Helpers.AsSuperTypeList(slots), member); 
                if (slot == null) {
                    return null; 
                } 
                result.Add(slot);
            } 
            return result;
        }

        // effects: Searches for member in slots and returns the corresponding slot 
        // If none is found, returns null
        internal static JoinTreeSlot GetSlotForMember(IEnumerable slots, MemberPath member) { 
            foreach (JoinTreeSlot slot in slots) { 
                if (MemberPath.EqualityComparer.Equals(slot.MemberPath, member)) {
                    return slot; 
                }
            }
            return null;
        } 
        #endregion
 
        #region JoinTreeSlot Comparer classes 
        // summary: Two JoinTreeSlots are equal when their MemberPaths are equal (JoinTreeSlot.IsEqualTo returns true)
        internal class JoinTreeSlotEqualityComparer : IEqualityComparer { 
            // effects: Returns true if left and right are semantically equivalent
            public bool Equals(JoinTreeSlot left, JoinTreeSlot right) {
                return ProjectedSlot.EqualityComparer.Equals(left, right);
            } 

            public int GetHashCode(JoinTreeSlot key) { 
                return ProjectedSlot.EqualityComparer.GetHashCode(key); 
            }
        } 

        #endregion
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System.Collections.Generic; 
using System.Text;
using System.Diagnostics;
using System.Data.Common.Utils;
using System.Data.Metadata.Edm; 
using System.Data.Mapping.ViewGeneration.CqlGeneration;
using System.Data.Mapping.ViewGeneration.Utils; 
 
namespace System.Data.Mapping.ViewGeneration.Structures {
 
    // A wrapper around JoinTreeNode that allows nodes to be stored as
    // ProjectedSlots
    internal class JoinTreeSlot : ProjectedSlot {
        #region Constructor 
        // effects: Creates a projected slot that references the relevant
        // jointree node (i.e., 
        internal JoinTreeSlot(JoinTreeNode node)  { 
            m_node = node;
        } 
        #endregion

        #region Fields
        // A comparer object for comparing jointree slots by MemberPaths 
        internal static readonly IEqualityComparer
                      SpecificEqualityComparer = new JoinTreeSlotEqualityComparer(); 
        private JoinTreeNode m_node; // The node that the var corresponds to 
        #endregion
 
        #region Properties
        // effects: Returns the join tree node corresponding to this variable
        internal JoinTreeNode JoinTreeNode {
            get { return m_node; } 
        }
 
        // effects: Returns the full metadata path from the root extent to 
        // this node, e.g., Person.Adrs.zip
        internal MemberPath MemberPath { 
            get { return m_node.MemberPath; }
        }
        #endregion
 
        #region Methods
        internal override StringBuilder AsCql(StringBuilder builder, MemberPath outputMember, 
                                              string blockAlias, int indentLevel) { 
            // Note: One might be tempted to use the Debug.Assert below; but
            // it is wrong: for query views, path is in SSpace and slotType 
            // is in CSpace since you are going from SSpace to CSpace
            // Debug.Assert(MemberPath.MemberType.Equals(slotType), "Type mismatch
            // of expected slot and member slot");
 
            // MemberPath's member type must be compatible with the outputMember Type.
            // Mapping must have already checked for this and hence we need to assert here. 
            // Today we can't put the debug assert since we require to access internal property 
            // in metadata and entitymapper is using this code, and hence fails to compile. Once
            // the entitymapper code is fixed to use the API's we can put this assert back 
            // CHANEG_[....]_


 
            // If memberpath's type and the outputmember type do not match,
            // we have to cast. We assume that the mapping loader has already 
            // checked that the casts are ok and emitted warnings 
            TypeUsage memberPathStoreTypeUsage = Helper.GetModelTypeUsage(MemberPath.LastMember);
            TypeUsage outputMemberStoreTypeUsage = Helper.GetModelTypeUsage(outputMember.LastMember); 

            if (false == memberPathStoreTypeUsage.EdmType.Equals(outputMemberStoreTypeUsage.EdmType)) {
                builder.Append("CAST(");
                MemberPath.AsCql(builder, blockAlias); 
                builder.Append(" AS ");
                CqlWriter.AppendEscapedTypeName(builder, outputMemberStoreTypeUsage.EdmType); 
                builder.Append(')'); 
            } else {
                MemberPath.AsCql(builder, blockAlias); 
            }
            return builder;
        }
 
        // effects: Given a slot and the new mapping, returns the
        // corresponding new slot 
        internal override ProjectedSlot RemapSlot(Dictionary remap) { 
            JoinTreeNode remappedNode = remap[JoinTreeNode];
            return new JoinTreeSlot(remappedNode); 
        }

        internal override void ToCompactString(StringBuilder builder) {
            m_node.ToCompactString(builder); 
        }
 
        internal string ToUserString() { 
            return m_node.MemberPath.PathToString(false);
        } 

        protected override bool IsEqualTo(ProjectedSlot right) {
            JoinTreeSlot rightSlot = right as JoinTreeSlot;
            if (rightSlot == null) { 
                return false;
            } 
            // We want equality of the paths 
            return MemberPath.EqualityComparer.Equals(m_node.MemberPath, rightSlot.m_node.MemberPath);
        } 

        protected override int GetHash() {
            return MemberPath.EqualityComparer.GetHashCode(m_node.MemberPath);
        } 
        #endregion
 
        #region Helper methods 
        // requires: prefix corresponds to an entity set or an association end
        // effects: Given the prefix, determines the slots in "slots" 
        // that correspond to the entity key for the entity set or the
        // association set end. Returns the list of slots.  Returns null if
        // even one of the key slots is not present in slots
        internal static List GetKeySlots(IEnumerable slots, MemberPath prefix) { 
            // Get the entity type of the hosted end or entity set
            EntitySet entitySet = prefix.EntitySet; 
 
            List keys = ExtentKey.GetKeysForEntityType(prefix, entitySet.ElementType);
            Debug.Assert(keys.Count > 0, "No keys for entity?"); 
            Debug.Assert(keys.Count == 1, "Currently, we only support primary keys");
            // Get the slots for the key
            List keySlots = GetSlots(slots, keys[0].KeyFields);
            return keySlots; 
        }
 
        // effects: Searches for members in slots and returns the 
        // corresponding slots in the same order as present in
        // members. Returns null if even one member is not present in slots 
        internal static List GetSlots(IEnumerable slots, IEnumerable members) {
            List result = new List();
            foreach (MemberPath member in members) {
                JoinTreeSlot slot = GetSlotForMember(Helpers.AsSuperTypeList(slots), member); 
                if (slot == null) {
                    return null; 
                } 
                result.Add(slot);
            } 
            return result;
        }

        // effects: Searches for member in slots and returns the corresponding slot 
        // If none is found, returns null
        internal static JoinTreeSlot GetSlotForMember(IEnumerable slots, MemberPath member) { 
            foreach (JoinTreeSlot slot in slots) { 
                if (MemberPath.EqualityComparer.Equals(slot.MemberPath, member)) {
                    return slot; 
                }
            }
            return null;
        } 
        #endregion
 
        #region JoinTreeSlot Comparer classes 
        // summary: Two JoinTreeSlots are equal when their MemberPaths are equal (JoinTreeSlot.IsEqualTo returns true)
        internal class JoinTreeSlotEqualityComparer : IEqualityComparer { 
            // effects: Returns true if left and right are semantically equivalent
            public bool Equals(JoinTreeSlot left, JoinTreeSlot right) {
                return ProjectedSlot.EqualityComparer.Equals(left, right);
            } 

            public int GetHashCode(JoinTreeSlot key) { 
                return ProjectedSlot.EqualityComparer.GetHashCode(key); 
            }
        } 

        #endregion
    }
} 

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

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