Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Metadata / CacheForPrimitiveTypes.cs / 1305376 / CacheForPrimitiveTypes.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Collections.ObjectModel; using System.Data.EntityModel; using System.Diagnostics; using System.Text; using System.Xml.Serialization; using System.Xml; using System.Xml.Schema; using System.IO; using System.Data.Common; using System.Globalization; namespace System.Data.Metadata.Edm { internal class CacheForPrimitiveTypes { #region Fields // The primitive type kind is a list of enum which the EDM model // Every specific instantiation of the model should map their // primitive types to the edm primitive types. // In this class, primitive type is to be cached // Key for the cache: primitive type kind // Value for the cache: List. A list is used because there an be multiple types mapping to the // same primitive type kind. For example, sqlserver has multiple string types. private List [] _primitiveTypeMap = new List [EdmConstants.NumPrimitiveTypes]; #endregion #region Methods /// /// Add the given primitive type to the primitive type cache /// /// The primitive type to add internal void Add(PrimitiveType type) { // Get to the list ListprimitiveTypes = EntityUtil.CheckArgumentOutOfRange(_primitiveTypeMap, (int)type.PrimitiveTypeKind, "primitiveTypeKind"); // If there isn't a list for the given model type, create one and add it if (primitiveTypes == null) { primitiveTypes = new List (); primitiveTypes.Add(type); _primitiveTypeMap[(int)type.PrimitiveTypeKind] = primitiveTypes; } else { primitiveTypes.Add(type); } } /// /// Try and get the mapped type for the given primitiveTypeKind in the given dataspace /// /// The primitive type kind of the primitive type to retrieve /// The facets to use in picking the primitive type /// The resulting type ///Whether a type was retrieved or not internal bool TryGetType(PrimitiveTypeKind primitiveTypeKind, IEnumerablefacets, out PrimitiveType type) { type = null; // Now, see if we have any types for this model type, if so, loop through to find the best matching one List primitiveTypes = EntityUtil.CheckArgumentOutOfRange(_primitiveTypeMap, (int)primitiveTypeKind, "primitiveTypeKind"); if ((null != primitiveTypes) && (0 < primitiveTypes.Count)) { if (primitiveTypes.Count == 1) { type = primitiveTypes[0]; return true; } if (facets == null) { FacetDescription[] facetDescriptions = EdmProviderManifest.GetInitialFacetDescriptions(primitiveTypeKind); if (facetDescriptions == null) { type = primitiveTypes[0]; return true; } Debug.Assert(facetDescriptions.Length > 0); facets = CacheForPrimitiveTypes.CreateInitialFacets(facetDescriptions); } Debug.Assert(type == null, "type must be null here"); bool isMaxLengthSentinel = false; // Create a dictionary of facets for easy lookup foreach (Facet facet in facets) { if ((primitiveTypeKind == PrimitiveTypeKind.String || primitiveTypeKind == PrimitiveTypeKind.Binary) && facet.Value != null && facet.Name == EdmProviderManifest.MaxLengthFacetName && Helper.IsUnboundedFacetValue(facet)) { // MaxLength has the sentinel value. So this facet need not be added. isMaxLengthSentinel = true; continue; } } int maxLength = 0; // Find a primitive type with the matching constraint foreach (PrimitiveType primitiveType in primitiveTypes) { if (isMaxLengthSentinel) { if (type == null) { type = primitiveType; maxLength = Helper.GetFacet(primitiveType.FacetDescriptions, EdmProviderManifest.MaxLengthFacetName).MaxValue.Value; } else { int newMaxLength = Helper.GetFacet(primitiveType.FacetDescriptions, EdmProviderManifest.MaxLengthFacetName).MaxValue.Value; if (newMaxLength > maxLength) { type = primitiveType; maxLength = newMaxLength; } } } else { type = primitiveType; break; } } Debug.Assert(type != null); return true; } return false; } private static Facet[] CreateInitialFacets(FacetDescription[] facetDescriptions) { Debug.Assert(facetDescriptions != null && facetDescriptions.Length > 0); Facet[] facets = new Facet[facetDescriptions.Length]; for (int i = 0; i < facetDescriptions.Length; ++i) { switch (facetDescriptions[i].FacetName) { case DbProviderManifest.MaxLengthFacetName: facets[i] = Facet.Create(facetDescriptions[i], TypeUsage.DefaultMaxLengthFacetValue); break; case DbProviderManifest.UnicodeFacetName: facets[i] = Facet.Create(facetDescriptions[i], TypeUsage.DefaultUnicodeFacetValue); break; case DbProviderManifest.FixedLengthFacetName: facets[i] = Facet.Create(facetDescriptions[i], TypeUsage.DefaultFixedLengthFacetValue); break; case DbProviderManifest.PrecisionFacetName: facets[i] = Facet.Create(facetDescriptions[i], TypeUsage.DefaultPrecisionFacetValue); break; case DbProviderManifest.ScaleFacetName: facets[i] = Facet.Create(facetDescriptions[i], TypeUsage.DefaultScaleFacetValue); break; default: Debug.Assert(false, "Unexpected facet"); break; } } return facets; } /// /// Get the list of the primitive types for the given dataspace /// ///internal System.Collections.ObjectModel.ReadOnlyCollection GetTypes() { List primitiveTypes = new List (); foreach (List types in _primitiveTypeMap) { if (null != types) { primitiveTypes.AddRange(types); } } return primitiveTypes.AsReadOnly(); } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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