Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / EntityModel / SchemaObjectModel / SchemaLookupTable.cs / 1305376 / SchemaLookupTable.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections; using System.Collections.Generic; using System.Collections.Specialized; using System.Data; using System.Data.Metadata.Edm; using System.Diagnostics; using System.Data.Entity; namespace System.Data.EntityModel.SchemaObjectModel { ////// Reponsible for keep map from alias to namespace for a given schema. /// internal sealed class AliasResolver { #region Fields private Dictionary_aliasToNamespaceMap = new Dictionary (StringComparer.Ordinal); private List _usingElementCollection = new List (); private Schema _definingSchema; #endregion #region Public Methods /// /// Construct the LookUp table /// public AliasResolver(Schema schema) { _definingSchema = schema; // If there is an alias defined for the defining schema, // add it to the look up table if (!string.IsNullOrEmpty(schema.Alias)) { _aliasToNamespaceMap.Add(schema.Alias, schema.Namespace); } } ////// Add a ReferenceSchema to the table /// /// the ReferenceSchema to add public void Add(UsingElement usingElement) { Debug.Assert(usingElement != null, "refSchema parameter is null"); string newNamespace = usingElement.NamespaceName; string newAlias = usingElement.Alias; // Check whether the alias is a reserved keyword if (CheckForSystemNamespace(usingElement, newAlias, NameKind.Alias)) { newAlias = null; } //Check whether the namespace is a reserved keyword if (CheckForSystemNamespace(usingElement, newNamespace, NameKind.Namespace)) { newNamespace = null; } // see if the alias has already been used if (newAlias != null && _aliasToNamespaceMap.ContainsKey(newAlias)) { // it has, issue an error and make sure we don't try to add it usingElement.AddError(ErrorCode.AlreadyDefined, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.AliasNameIsAlreadyDefined(newAlias)); newAlias = null; } // Its okay if they add the same namespace twice, until they have different alias // if there's an alias, add it. if (newAlias != null) { _aliasToNamespaceMap.Add(newAlias, newNamespace); _usingElementCollection.Add(usingElement); } } ////// Get the Schema(s) a namespace or alias might refer to /// returned schemas may be null is called before or during Schema Resolution /// /// the name to look up ///array of schemas (0 length if no schemas match name public bool TryResolveAlias(string alias, out string namespaceName) { Debug.Assert(!String.IsNullOrEmpty(alias), "alias must never be null"); // Check if there is an alias defined with this name return _aliasToNamespaceMap.TryGetValue(alias, out namespaceName); } ////// Resolves all the namespace specified in the using elements in this schema /// public void ResolveNamespaces() { foreach (UsingElement usingElement in _usingElementCollection) { if (!_definingSchema.SchemaManager.IsValidNamespaceName(usingElement.NamespaceName)) { usingElement.AddError(ErrorCode.InvalidNamespaceInUsing, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.InvalidNamespaceInUsing(usingElement.NamespaceName)); } } } #endregion #region Private Methods ////// Check if the given name is a reserved keyword. if yes, add appropriate error to the refschema /// /// /// /// ///private bool CheckForSystemNamespace(UsingElement refSchema, string name, NameKind nameKind) { Debug.Assert(_definingSchema.ProviderManifest != null, "Since we don't allow using elements in provider manifest, provider manifest can never be null"); // We need to check for system namespace if (EdmItemCollection.IsSystemNamespace(_definingSchema.ProviderManifest, name)) { if (nameKind == NameKind.Alias) { refSchema.AddError(ErrorCode.CannotUseSystemNamespaceAsAlias, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.CannotUseSystemNamespaceAsAlias(name)); } else { refSchema.AddError(ErrorCode.NeedNotUseSystemNamespaceInUsing, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.NeedNotUseSystemNamespaceInUsing(name)); } return true; } return false; } #endregion #region Private Types /// /// Kind of Name /// private enum NameKind { ///It's an Alias Alias, ///It's a namespace Namespace, } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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