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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Metadata / MetadataArtifactLoaderResource.cs / 1305376 / MetadataArtifactLoaderResource.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System.Collections.Generic; using System.Collections; using System.Diagnostics; using System.Globalization; using System.Reflection; using System.Text; using System.Xml; using System.Data.Mapping; using System.IO; using System.Security; using System.Security.Permissions; using System.Security.Cryptography; using System.Data.EntityModel.SchemaObjectModel; namespace System.Data.Metadata.Edm { ////// This class represents one resource item to be loaded from an assembly. /// internal class MetadataArtifactLoaderResource : MetadataArtifactLoader, IComparable { private readonly bool _alreadyLoaded = false; private readonly Assembly _assembly; private readonly string _resourceName; ////// Constructor - loads the resource stream /// /// The path to the resource to load /// The global registry of URIs internal MetadataArtifactLoaderResource(Assembly assembly, string resourceName, ICollectionuriRegistry) { Debug.Assert(assembly != null); Debug.Assert(resourceName != null); _assembly = assembly; _resourceName = resourceName; string tempPath = MetadataArtifactLoaderCompositeResource.CreateResPath(_assembly, _resourceName); _alreadyLoaded = uriRegistry.Contains(tempPath); if (!_alreadyLoaded) { uriRegistry.Add(tempPath); // '_alreadyLoaded' is not set because while we would like to prevent // other instances of MetadataArtifactLoaderFile that wrap the same // _path from being added to the list of paths/readers, we do want to // include this particular instance. } } public override string Path { get { return MetadataArtifactLoaderCompositeResource.CreateResPath(_assembly, _resourceName); } } /// /// Implementation of IComparable.CompareTo() /// /// The object to compare to ///0 if the loaders are "equal" (i.e., have the same _path value) public int CompareTo(object obj) { MetadataArtifactLoaderResource loader = obj as MetadataArtifactLoaderResource; if (loader != null) { return string.Compare(Path, loader.Path, StringComparison.OrdinalIgnoreCase); } Debug.Assert(false, "object is not a MetadataArtifactLoaderResource"); return -1; } ////// Equals() returns true if the objects have the same _path value /// /// The object to compare to ///true if the objects have the same _path value public override bool Equals(object obj) { return this.CompareTo(obj) == 0; } ////// GetHashCode override that defers the result to the _path member variable. /// ///public override int GetHashCode() { return Path.GetHashCode(); } public override void CollectFilePermissionPaths(List paths, DataSpace spaceToGet) { // does not apply } /// /// Get paths to artifacts for a specific DataSpace. /// /// The DataSpace for the artifacts of interest ///A List of strings identifying paths to all artifacts for a specific DataSpace public override ListGetPaths(DataSpace spaceToGet) { List list = new List (); if (!_alreadyLoaded && MetadataArtifactLoader.IsArtifactOfDataSpace(Path, spaceToGet)) { list.Add(Path); } return list; } /// /// Get paths to all artifacts /// ///A List of strings identifying paths to all resources public override ListGetPaths() { List list = new List (); if (!_alreadyLoaded) { list.Add(Path); } return list; } /// /// Create and return an XmlReader around the resource represented by this instance. /// ///A List of XmlReaders for all resources public override ListGetReaders(Dictionary sourceDictionary) { List list = new List (); if (!_alreadyLoaded) { XmlReader reader = CreateReader(); list.Add(reader); if (sourceDictionary != null) { sourceDictionary.Add(this, reader); } } return list; } private XmlReader CreateReader() { Stream stream = LoadResource(); XmlReaderSettings readerSettings = Schema.CreateEdmStandardXmlReaderSettings(); // close the stream when the xmlreader is closed // now the reader owns the stream readerSettings.CloseInput = true; // we know that we aren't reading a fragment readerSettings.ConformanceLevel = ConformanceLevel.Document; XmlReader reader = XmlReader.Create(stream, readerSettings); // cannot set the base URI because res:// URIs cause the schema parser // to choke return reader; } /// /// Create and return an XmlReader around the resource represented by this instance /// if it is of the requested DataSpace type. /// /// The DataSpace corresponding to the requested artifacts ///A List of XmlReader objects public override ListCreateReaders(DataSpace spaceToGet) { List list = new List (); if (!_alreadyLoaded) { if (MetadataArtifactLoader.IsArtifactOfDataSpace(Path, spaceToGet)) { XmlReader reader = CreateReader(); list.Add(reader); } } return list; } /// /// This method parses the path to the resource and attempts to load it. /// The method also accounts for the wildcard assembly name. /// private Stream LoadResource() { Stream resourceStream; if (TryCreateResourceStream(out resourceStream)) { return resourceStream; } throw EntityUtil.Metadata(System.Data.Entity.Strings.UnableToLoadResource); } private bool TryCreateResourceStream(out Stream resourceStream) { resourceStream = _assembly.GetManifestResourceStream(_resourceName); return resourceStream != null; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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