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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / EntityModel / SchemaObjectModel / SchemaManager.cs / 1305376 / SchemaManager.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections; using System.Collections.Generic; using System.Diagnostics; using System.Data.Metadata.Edm; using System.Data.Common.Utils; using System.Xml; using System.Data.Common; using System.Data.Entity; using System.Linq; namespace System.Data.EntityModel.SchemaObjectModel { internal delegate void AttributeValueNotification(string token, ActionaddError); internal delegate DbProviderManifest ProviderManifestNeeded(Action addError); /// /// Class responsible for parsing,validating a collection of schema /// [System.Diagnostics.DebuggerDisplay("DataModel={DataModel}")] internal class SchemaManager { #region Instance Fields // This keeps track of all the possible namespaces encountered till now. This helps in displaying the error to the // user - if the particular type is not found, we can report whether the namespace was invalid or the type with the // given name was not found in the given namespace. This also helps in validating the namespace in the using elements private readonly HashSet_namespaceLookUpTable = new HashSet (StringComparer.Ordinal); // List of all the schema types across all the schemas. This is to ensure that there is no duplicate type encountered // across schemas private readonly SchemaElementLookUpTable _schemaTypes = new SchemaElementLookUpTable (); // We want to stop parsing/resolving/validation after the first 100 errors private const int MaxErrorCount = 100; // delay loaded private DbProviderManifest _providerManifest; private PrimitiveSchema _primitiveSchema; private readonly SchemaDataModelOption _dataModel; private readonly ProviderManifestNeeded _providerManifestNeeded; private readonly AttributeValueNotification _providerNotification; private readonly AttributeValueNotification _providerManifestTokenNotification; #endregion #region Constructor private SchemaManager(SchemaDataModelOption dataModel, AttributeValueNotification providerNotification, AttributeValueNotification providerManifestTokenNotification, ProviderManifestNeeded providerManifestNeeded) { _dataModel = dataModel; _providerNotification = providerNotification; _providerManifestTokenNotification = providerManifestTokenNotification; _providerManifestNeeded = providerManifestNeeded; } #endregion #region Public Methods public static IList LoadProviderManifest(XmlReader xmlReader, string location, bool checkForSystemNamespace, out Schema schema) { IList schemaCollection = new List (1); DbProviderManifest providerManifest = checkForSystemNamespace ? EdmProviderManifest.Instance : null; IList errors = ParseAndValidate(new XmlReader[] { xmlReader }, new string[] { location }, SchemaDataModelOption.ProviderManifestModel, providerManifest, out schemaCollection); // In case of errors, there are no schema in the schema collection if (schemaCollection.Count != 0) { schema = schemaCollection[0]; } else { Debug.Assert(errors.Count != 0, "There must be some error encountered"); schema = null; } return errors; } public static void NoOpAttributeValueNotification(string attributeValue, Action addError) { } public static IList ParseAndValidate(IEnumerable xmlReaders, IEnumerable sourceFilePaths, SchemaDataModelOption dataModel, DbProviderManifest providerManifest, out IList schemaCollection) { return ParseAndValidate(xmlReaders, sourceFilePaths, dataModel, NoOpAttributeValueNotification, NoOpAttributeValueNotification, delegate(Action addError) { return providerManifest == null ? MetadataItem.EdmProviderManifest : providerManifest; }, out schemaCollection); } public static IList ParseAndValidate(IEnumerable xmlReaders, IEnumerable sourceFilePaths, SchemaDataModelOption dataModel, AttributeValueNotification providerNotification, AttributeValueNotification providerManifestTokenNotification, ProviderManifestNeeded providerManifestNeeded, out IList schemaCollection) { SchemaManager schemaManager = new SchemaManager(dataModel, providerNotification, providerManifestTokenNotification, providerManifestNeeded); var errorCollection = new List (); schemaCollection = new List (); bool errorEncountered = false; List filePathList; if (sourceFilePaths != null) { filePathList = new List (sourceFilePaths); } else { filePathList = new List (); } int index = 0; foreach (XmlReader xmlReader in xmlReaders) { string location = null; if (filePathList.Count <= index) { TryGetBaseUri(xmlReader, out location); } else { location = filePathList[index]; } Schema schema; schema = new Schema(schemaManager); var errorsForCurrentSchema = schema.Parse(xmlReader, location); CheckIsSameVersion(schema, schemaCollection, errorCollection); // If the number of errors exceeded the max error count, then return if (UpdateErrorCollectionAndCheckForMaxErrors(errorCollection, errorsForCurrentSchema, ref errorEncountered)) { return errorCollection; } // Add the schema to the collection if there are no errors. There are errors in which schema do not have any namespace. // Also if there is an error encountered in one of the schema, we do not need to add the remaining schemas since // we will never go to the resolve phase. if (!errorEncountered) { schemaCollection.Add(schema); schemaManager.AddSchema(schema); var currentSchemaVersion = schema.SchemaVersion; Debug.Assert(schemaCollection.All(s => s.SchemaVersion == currentSchemaVersion || s.SchemaVersion != XmlConstants.UndefinedVersion)); } index++; } // If there are no errors encountered in the parsing stage, we can proceed to the // parsing and validating phase if (!errorEncountered) { foreach (Schema schema in schemaCollection) { if (UpdateErrorCollectionAndCheckForMaxErrors(errorCollection, schema.Resolve(), ref errorEncountered)) { return errorCollection; } } // If there are no errors encountered in the parsing stage, we can proceed to the // parsing and validating phase if (!errorEncountered) { foreach (Schema schema in schemaCollection) { if (UpdateErrorCollectionAndCheckForMaxErrors(errorCollection, schema.ValidateSchema(), ref errorEncountered)) { return errorCollection; } } } } return errorCollection; } private static bool CheckIsSameVersion(Schema schemaToBeAdded, IEnumerable schemaCollection, List errorCollection) { if (schemaToBeAdded.SchemaVersion != XmlConstants.UndefinedVersion && schemaCollection.Count() > 0) { if (schemaCollection.Any(s => s.SchemaVersion != XmlConstants.UndefinedVersion && s.SchemaVersion != schemaToBeAdded.SchemaVersion)) { errorCollection.Add( new EdmSchemaError( Strings.CannotLoadDifferentVersionOfSchemaInTheSameItemCollection, (int)ErrorCode.CannotLoadDifferentVersionOfSchemaInTheSameItemCollection, EdmSchemaErrorSeverity.Error)); } } return true; } /// /// Add the namespace of the given schema to the namespace lookup table /// public void AddSchema(Schema schema) { Debug.Assert(schema.DataModel == _dataModel, "DataModel must match"); if (_namespaceLookUpTable.Count == 0 && schema.DataModel != SchemaDataModelOption.ProviderManifestModel) { // Add the primitive type namespace to the namespace look up table if (this.PrimitiveSchema.Namespace != null) { _namespaceLookUpTable.Add(this.PrimitiveSchema.Namespace); } } // Add the namespace to the namespaceLookUpTable. // Its okay to have multiple schemas with the same namespace _namespaceLookUpTable.Add(schema.Namespace); } ////// Resolve the type - if the type is not found, return appropriate error /// ///public bool TryResolveType(string namespaceName, string typeName, out SchemaType schemaType) { // For resolving entity container names, namespace can be null string fullyQualifiedName = String.IsNullOrEmpty(namespaceName) ? typeName : namespaceName + "." + typeName; schemaType = SchemaTypes.LookUpEquivalentKey(fullyQualifiedName); if (schemaType != null) { return true; } return false; } /// /// Returns true if this is a valid namespace name or else returns false /// public bool IsValidNamespaceName(string namespaceName) { return _namespaceLookUpTable.Contains(namespaceName); } #endregion // Public Methods #region Private Methods ////// Checks if the xml reader has base uri. If it doesn't have, it adds error, other /// returns the location from the base uri /// ///internal static bool TryGetBaseUri(XmlReader xmlReader, out string location) { string baseUri = xmlReader.BaseURI; Uri uri = null; if (!string.IsNullOrEmpty(baseUri) && Uri.TryCreate(baseUri, UriKind.Absolute, out uri) && uri.Scheme == "file") { location = Helper.GetFileNameFromUri(uri); return true; } else { location = null; return false; } } /// /// Add the given list of newErrors to the error collection. If there is a error in the new errors, /// it sets the errorEncountered to true. Returns true if the number of errors encountered is more /// than max errors /// ///private static bool UpdateErrorCollectionAndCheckForMaxErrors(List errorCollection, IList newErrors, ref bool errorEncountered) { // If we have encountered error already in one of the schemas, then we don't need to check for errors in the remaining schemas. // Just keep aggregating the errors and throw them at the end. if (!errorEncountered) { if (!MetadataHelper.CheckIfAllErrorsAreWarnings(newErrors)) { errorEncountered = true; } } // Add the new errors to the error collection errorCollection.AddRange(newErrors); if (errorEncountered && errorCollection.Where(e => e.Severity == EdmSchemaErrorSeverity.Error).Count() > MaxErrorCount) { return true; } return false; } #endregion #region Internal Properties internal SchemaElementLookUpTable SchemaTypes { get { return _schemaTypes; } } internal DbProviderManifest GetProviderManifest(Action addError) { if (_providerManifest == null) { _providerManifest = _providerManifestNeeded(addError); } return _providerManifest; } internal SchemaDataModelOption DataModel { get { return _dataModel; } } internal void EnsurePrimitiveSchemaIsLoaded() { if (_primitiveSchema == null) { _primitiveSchema = new PrimitiveSchema(this); } } internal PrimitiveSchema PrimitiveSchema { get { return _primitiveSchema; } } internal AttributeValueNotification ProviderNotification { get { return _providerNotification; } } internal AttributeValueNotification ProviderManifestTokenNotification { get { return _providerManifestTokenNotification; } } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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