Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Map / ViewGeneration / Validation / BasicCellRelation.cs / 1305376 / BasicCellRelation.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved.Bharani1729 // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System.Collections.Generic; using System.Data.Mapping.ViewGeneration.Structures; using System.Text; using System.Diagnostics; using System.Data.Common.Utils; using System.Data.Metadata.Edm; namespace System.Data.Mapping.ViewGeneration.Validation { using BasicSchemaConstraints = SchemaConstraints; // This class represents a relation signature that lists all scalar // slots for the join tree in cell query (before projection) internal class BasicCellRelation : CellRelation { #region Constructor // effects: Creates a basic cell relation for query internal BasicCellRelation(CellQuery cellQuery, ViewCellRelation viewCellRelation, IEnumerable slots) : base(viewCellRelation.CellNumber) { m_cellQuery = cellQuery; m_slots = new List (slots); Debug.Assert(m_slots.Count > 0, "Cell relation with not even an exent?"); m_viewCellRelation = viewCellRelation; } #endregion #region Fields private CellQuery m_cellQuery; private List m_slots; private ViewCellRelation m_viewCellRelation; // The viewcellrelation // corresponding to this basiccellrelation #endregion #region Properties internal ViewCellRelation ViewCellRelation { get { return m_viewCellRelation; } } #endregion #region Key Constraints Methods // effects: Modifies constraints to contain the key constraints that // are present in this relation internal void PopulateKeyConstraints(BasicSchemaConstraints constraints) { Debug.Assert(this == m_cellQuery.BasicCellRelation, "Cellquery does not point to the correct BasicCellRelation?"); Debug.Assert(m_cellQuery.Extent is EntitySet || m_cellQuery.Extent is AssociationSet, "Top level extents handled is currently entityset or association set"); if (m_cellQuery.Extent is EntitySet) { PopulateKeyConstraintsForEntitySet(constraints); } else { PopulateKeyConstraintsForRelationshipSet(constraints); } } // requires: this to correspond to a cell relation for an entityset (m_cellQuery.Extent) // effects: Adds any key constraints present in this to constraints private void PopulateKeyConstraintsForEntitySet(BasicSchemaConstraints constraints) { MemberPath prefix = new MemberPath(m_cellQuery.Extent); EntityType entityType = (EntityType)m_cellQuery.Extent.ElementType; // Get all the keys for the entity type and create the key constraints List keys = ExtentKey.GetKeysForEntityType(prefix, entityType); AddKeyConstraints(keys, constraints); } // requires: this to correspond to a cell relation for an association set (m_cellQuery.Extent) // effects: Adds any key constraints present in this relation in // constraints private void PopulateKeyConstraintsForRelationshipSet(BasicSchemaConstraints constraints) { AssociationSet relationshipSet = m_cellQuery.Extent as AssociationSet; // Gather all members of all keys // CHANGE_[....]_FEATURE_KEYS: assume that an Entity has exactly one key. Otherwise we // have to take a cross-product of all keys // Keep track of all the key members for the association in a set // so that if no end corresponds to a key, we use all the members // to form the key Set associationKeyMembers = new Set (MemberPath.EqualityComparer); bool hasAnEndThatFormsKey = false; // Determine the keys of each end. If the end forms a key, add it // as a key to the set foreach (AssociationSetEnd end in relationshipSet.AssociationSetEnds) { AssociationEndMember endMember = end.CorrespondingAssociationEndMember; MemberPath prefix = new MemberPath(relationshipSet, endMember); List keys = ExtentKey.GetKeysForEntityType(prefix, end.EntitySet.ElementType); Debug.Assert(keys.Count > 0, "No keys for entity?"); Debug.Assert(keys.Count == 1, "Currently, we only support primary keys"); if (MetadataHelper.DoesEndFormKey(relationshipSet, endMember)) { // This end has is a key end AddKeyConstraints(keys, constraints); hasAnEndThatFormsKey = true; } // Add the members of the (only) key to associationKey associationKeyMembers.AddRange(keys[0].KeyFields); } // If an end forms a key then that key implies the full key if (false == hasAnEndThatFormsKey) { // No end is a key -- take all the end members and make a key // based on that ExtentKey key = new ExtentKey(associationKeyMembers); ExtentKey[] keys = new ExtentKey[] { key }; AddKeyConstraints(keys, constraints); } } // effects: Given keys for this relation, adds one key constraint for // each key present in keys private void AddKeyConstraints(IEnumerable keys, BasicSchemaConstraints constraints) { foreach (ExtentKey key in keys) { // If the key is being projected, only then do we add the key constraint List keySlots = MemberProjectedSlot.GetSlots(m_slots, key.KeyFields); if (keySlots != null) { BasicKeyConstraint keyConstraint = new BasicKeyConstraint(this, keySlots); constraints.Add(keyConstraint); } } } #endregion #region Comparer/String Methods protected override int GetHash() { // Note: Using CLR-Hashcode return m_cellQuery.GetHashCode(); // We need not hash the slots, etc - cellQuery should give us enough // differentiation and land the relation into the same bucket } internal override void ToCompactString(StringBuilder builder) { builder.Append("BasicRel: "); // Just print the extent name from slot 0 StringUtil.FormatStringBuilder(builder, "{0}", m_slots[0]); } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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