relpropertyhelper.cs source code in C# .NET

                        Code:
                         / Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / ndp / fx / src / DataEntity / System / Data / Query / InternalTrees / relpropertyhelper.cs / 1 / relpropertyhelper.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....], [....]
//--------------------------------------------------------------------- 
 
using System;
using System.Collections.Generic; 
using System.Globalization;
using System.Diagnostics;
using System.Data.Common;
using System.Data.Metadata.Edm; 

namespace System.Data.Query.InternalTrees 
{ 

    ///  
    /// A "Rel" property is best thought of as a collocated reference (aka foreign key).
    /// Any entity may have zero or more rel-properties carried along with it (purely
    /// as a means to optimize for common relationship traversal scenarios)
    /// 
    /// Although the definition is lax here, we only deal with RelProperties that
    /// are one-ended (ie) the target multiplicity is at most One. 
    /// 
    /// Consider for example, an Order entity with a (N:1) Order-Customer relationship. The Customer ref
    /// will be treated as a rel property for the Order entity. 
    /// Similarly, the OrderLine entity may have an Order ref rel property (assuming that there was
    /// a N:1 relationship between OrderLine and Order)
    /// 
    internal sealed class RelProperty 
    {
        #region private state 
        private readonly RelationshipType m_relationshipType; 
        private readonly RelationshipEndMember m_fromEnd;
        private readonly RelationshipEndMember m_toEnd; 
        #endregion

        #region constructors
        internal RelProperty(RelationshipType relationshipType, RelationshipEndMember fromEnd, RelationshipEndMember toEnd) 
        {
            m_relationshipType = relationshipType; 
            m_fromEnd = fromEnd; 
            m_toEnd = toEnd;
        } 
        #endregion

        #region public APIs
        ///  
        /// The relationship
        ///  
        public RelationshipType Relationship { get { return m_relationshipType; } } 

        ///  
        /// The source end of the relationship
        /// 
        public RelationshipEndMember FromEnd { get { return m_fromEnd; } }
 
        /// 
        /// the target end of the relationship 
        ///  
        public RelationshipEndMember ToEnd { get { return m_toEnd; } }
 
        /// 
        /// Our definition of equality
        /// 
        ///  
        /// 
        public override bool Equals(object obj) 
        { 
            RelProperty other = obj as RelProperty;
            return (other != null && 
                this.Relationship.EdmEquals(other.Relationship) &&
                this.FromEnd.EdmEquals(other.FromEnd) &&
                this.ToEnd.EdmEquals(other.ToEnd));
        } 

        ///  
        /// our hash code 
        /// 
        ///  
        public override int GetHashCode()
        {
            return this.ToEnd.Identity.GetHashCode();
        } 

        ///  
        /// String form 
        /// 
        ///  
        [DebuggerNonUserCode]
        public override string ToString()
        {
            return m_relationshipType.ToString() + ":" + 
                m_fromEnd.ToString() + ":" +
                m_toEnd.ToString(); 
        } 

        #endregion 
    }

    /// 
    /// A helper class for all rel-properties 
    /// 
    internal sealed class RelPropertyHelper 
    { 
        #region private state
        private Dictionary> _relPropertyMap; 
        private HashSet _interestingRelProperties;
        #endregion

        #region private methods 
        /// 
        /// Add the rel property induced by the specified relationship, (if the target 
        /// end has a multiplicity of one) 
        /// We only keep track of rel-properties that are "interesting"
        ///  
        /// the association relationship
        /// source end of the relationship traversal
        /// target end of the traversal
        private void AddRelProperty(AssociationType associationType, 
            AssociationEndMember fromEnd, AssociationEndMember toEnd)
        { 
            if (toEnd.RelationshipMultiplicity == RelationshipMultiplicity.Many) 
            {
                return; 
            }
            RelProperty prop = new RelProperty(associationType, fromEnd, toEnd);
            if (_interestingRelProperties == null ||
                !_interestingRelProperties.Contains(prop)) 
            {
                return; 
            } 

            EntityTypeBase entityType = (EntityTypeBase)((RefType)fromEnd.TypeUsage.EdmType).ElementType; 
            List propList;
            if (!_relPropertyMap.TryGetValue(entityType, out propList))
            {
                propList = new List(); 
                _relPropertyMap[entityType] = propList;
            } 
            propList.Add(prop); 
        }
 
        /// 
        /// Add any rel properties that are induced by the supplied relationship
        /// 
        /// the relationship 
        private void ProcessRelationship(RelationshipType relationshipType)
        { 
            AssociationType associationType = relationshipType as AssociationType; 
            if (associationType == null)
            { 
                return;
            }

            // Handle only binary associations 
            if (associationType.AssociationEndMembers.Count != 2)
            { 
                return; 
            }
 
            AssociationEndMember end0 = associationType.AssociationEndMembers[0];
            AssociationEndMember end1 = associationType.AssociationEndMembers[1];

            AddRelProperty(associationType, end0, end1); 
            AddRelProperty(associationType, end1, end0);
        } 
 
        #endregion
 
        #region constructors
        internal RelPropertyHelper(MetadataWorkspace ws, HashSet interestingRelProperties)
        {
            _relPropertyMap = new Dictionary>(); 
            _interestingRelProperties = interestingRelProperties;
 
            foreach (RelationshipType relationshipType in ws.GetItems(DataSpace.CSpace)) 
            {
                ProcessRelationship(relationshipType); 
            }
        }
        #endregion
 
        #region public APIs
 
        ///  
        /// Get the rel properties declared by this type (and *not* by any of its subtypes)
        ///  
        /// the entity type
        /// set of rel properties declared for this type
        internal IEnumerable GetDeclaredOnlyRelProperties(EntityTypeBase entityType)
        { 
            List relProperties;
            if (_relPropertyMap.TryGetValue(entityType, out relProperties)) 
            { 
                foreach (RelProperty p in relProperties)
                { 
                    yield return p;
                }
            }
            yield break; 
        }
 
        ///  
        /// Get the rel-properties of this entity and its supertypes (starting from the root)
        ///  
        /// the entity type
        /// set of rel-properties for this entity type (and its supertypes)
        internal IEnumerable GetRelProperties(EntityTypeBase entityType)
        { 
            if (entityType.BaseType != null)
            { 
                foreach (RelProperty p in GetRelProperties(entityType.BaseType as EntityTypeBase)) 
                {
                    yield return p; 
                }
            }

            foreach (RelProperty p in GetDeclaredOnlyRelProperties(entityType)) 
            {
                yield return p; 
            } 

        } 

        #endregion
    }
 
}

// 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.Globalization;
using System.Diagnostics;
using System.Data.Common;
using System.Data.Metadata.Edm; 

namespace System.Data.Query.InternalTrees 
{ 

    ///  
    /// A "Rel" property is best thought of as a collocated reference (aka foreign key).
    /// Any entity may have zero or more rel-properties carried along with it (purely
    /// as a means to optimize for common relationship traversal scenarios)
    /// 
    /// Although the definition is lax here, we only deal with RelProperties that
    /// are one-ended (ie) the target multiplicity is at most One. 
    /// 
    /// Consider for example, an Order entity with a (N:1) Order-Customer relationship. The Customer ref
    /// will be treated as a rel property for the Order entity. 
    /// Similarly, the OrderLine entity may have an Order ref rel property (assuming that there was
    /// a N:1 relationship between OrderLine and Order)
    /// 
    internal sealed class RelProperty 
    {
        #region private state 
        private readonly RelationshipType m_relationshipType; 
        private readonly RelationshipEndMember m_fromEnd;
        private readonly RelationshipEndMember m_toEnd; 
        #endregion

        #region constructors
        internal RelProperty(RelationshipType relationshipType, RelationshipEndMember fromEnd, RelationshipEndMember toEnd) 
        {
            m_relationshipType = relationshipType; 
            m_fromEnd = fromEnd; 
            m_toEnd = toEnd;
        } 
        #endregion

        #region public APIs
        ///  
        /// The relationship
        ///  
        public RelationshipType Relationship { get { return m_relationshipType; } } 

        ///  
        /// The source end of the relationship
        /// 
        public RelationshipEndMember FromEnd { get { return m_fromEnd; } }
 
        /// 
        /// the target end of the relationship 
        ///  
        public RelationshipEndMember ToEnd { get { return m_toEnd; } }
 
        /// 
        /// Our definition of equality
        /// 
        ///  
        /// 
        public override bool Equals(object obj) 
        { 
            RelProperty other = obj as RelProperty;
            return (other != null && 
                this.Relationship.EdmEquals(other.Relationship) &&
                this.FromEnd.EdmEquals(other.FromEnd) &&
                this.ToEnd.EdmEquals(other.ToEnd));
        } 

        ///  
        /// our hash code 
        /// 
        ///  
        public override int GetHashCode()
        {
            return this.ToEnd.Identity.GetHashCode();
        } 

        ///  
        /// String form 
        /// 
        ///  
        [DebuggerNonUserCode]
        public override string ToString()
        {
            return m_relationshipType.ToString() + ":" + 
                m_fromEnd.ToString() + ":" +
                m_toEnd.ToString(); 
        } 

        #endregion 
    }

    /// 
    /// A helper class for all rel-properties 
    /// 
    internal sealed class RelPropertyHelper 
    { 
        #region private state
        private Dictionary> _relPropertyMap; 
        private HashSet _interestingRelProperties;
        #endregion

        #region private methods 
        /// 
        /// Add the rel property induced by the specified relationship, (if the target 
        /// end has a multiplicity of one) 
        /// We only keep track of rel-properties that are "interesting"
        ///  
        /// the association relationship
        /// source end of the relationship traversal
        /// target end of the traversal
        private void AddRelProperty(AssociationType associationType, 
            AssociationEndMember fromEnd, AssociationEndMember toEnd)
        { 
            if (toEnd.RelationshipMultiplicity == RelationshipMultiplicity.Many) 
            {
                return; 
            }
            RelProperty prop = new RelProperty(associationType, fromEnd, toEnd);
            if (_interestingRelProperties == null ||
                !_interestingRelProperties.Contains(prop)) 
            {
                return; 
            } 

            EntityTypeBase entityType = (EntityTypeBase)((RefType)fromEnd.TypeUsage.EdmType).ElementType; 
            List propList;
            if (!_relPropertyMap.TryGetValue(entityType, out propList))
            {
                propList = new List(); 
                _relPropertyMap[entityType] = propList;
            } 
            propList.Add(prop); 
        }
 
        /// 
        /// Add any rel properties that are induced by the supplied relationship
        /// 
        /// the relationship 
        private void ProcessRelationship(RelationshipType relationshipType)
        { 
            AssociationType associationType = relationshipType as AssociationType; 
            if (associationType == null)
            { 
                return;
            }

            // Handle only binary associations 
            if (associationType.AssociationEndMembers.Count != 2)
            { 
                return; 
            }
 
            AssociationEndMember end0 = associationType.AssociationEndMembers[0];
            AssociationEndMember end1 = associationType.AssociationEndMembers[1];

            AddRelProperty(associationType, end0, end1); 
            AddRelProperty(associationType, end1, end0);
        } 
 
        #endregion
 
        #region constructors
        internal RelPropertyHelper(MetadataWorkspace ws, HashSet interestingRelProperties)
        {
            _relPropertyMap = new Dictionary>(); 
            _interestingRelProperties = interestingRelProperties;
 
            foreach (RelationshipType relationshipType in ws.GetItems(DataSpace.CSpace)) 
            {
                ProcessRelationship(relationshipType); 
            }
        }
        #endregion
 
        #region public APIs
 
        ///  
        /// Get the rel properties declared by this type (and *not* by any of its subtypes)
        ///  
        /// the entity type
        /// set of rel properties declared for this type
        internal IEnumerable GetDeclaredOnlyRelProperties(EntityTypeBase entityType)
        { 
            List relProperties;
            if (_relPropertyMap.TryGetValue(entityType, out relProperties)) 
            { 
                foreach (RelProperty p in relProperties)
                { 
                    yield return p;
                }
            }
            yield break; 
        }
 
        ///  
        /// Get the rel-properties of this entity and its supertypes (starting from the root)
        ///  
        /// the entity type
        /// set of rel-properties for this entity type (and its supertypes)
        internal IEnumerable GetRelProperties(EntityTypeBase entityType)
        { 
            if (entityType.BaseType != null)
            { 
                foreach (RelProperty p in GetRelProperties(entityType.BaseType as EntityTypeBase)) 
                {
                    yield return p; 
                }
            }

            foreach (RelProperty p in GetDeclaredOnlyRelProperties(entityType)) 
            {
                yield return p; 
            } 

        } 

        #endregion
    }
 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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relpropertyhelper.cs source code in C# .NET

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