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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Metadata / MetadataArtifactLoaderXmlReaderWrapper.cs / 1305376 / MetadataArtifactLoaderXmlReaderWrapper.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System.Collections.Generic; using System.Collections; using System.Diagnostics; using System.Text; using System.Xml; using System.Security.Permissions; namespace System.Data.Metadata.Edm { ////// This class represents a wrapper around an XmlReader to be used to load metadata. /// Note that the XmlReader object isn't created here -- the wrapper simply stores /// a reference to it -- therefore we do not Close() the reader when we Dispose() /// the wrapper, i.e., Dispose() is a no-op. /// internal class MetadataArtifactLoaderXmlReaderWrapper : MetadataArtifactLoader, IComparable { private readonly XmlReader _reader = null; private readonly string _resourceUri = null; ////// Constructor - saves off the XmlReader in a private data field /// /// The path to the resource to load public MetadataArtifactLoaderXmlReaderWrapper(XmlReader xmlReader) { _reader = xmlReader; _resourceUri = xmlReader.BaseURI; } public override string Path { get { if (string.IsNullOrEmpty(this._resourceUri)) { return string.Empty; } else { return this._resourceUri; } } } ////// 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) { MetadataArtifactLoaderXmlReaderWrapper loader = obj as MetadataArtifactLoaderXmlReaderWrapper; if (loader != null) { if (Object.ReferenceEquals(this._reader, loader._reader)) { return 0; } else { return -1; } } Debug.Assert(false, "object is not a MetadataArtifactLoaderXmlReaderWrapper"); 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 _reader.GetHashCode(); } public override void CollectFilePermissionPaths(List paths, DataSpace spaceToGet) { // no op } /// /// 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 (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() { return new List (new string[] { Path }); } /// /// Get XmlReaders for all resources /// ///A List of XmlReaders for all resources public override ListGetReaders(Dictionary sourceDictionary) { List list = new List (); list.Add(this._reader); if (sourceDictionary != null) { sourceDictionary.Add(this, _reader); } return list; } /// /// 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 (MetadataArtifactLoader.IsArtifactOfDataSpace(Path, spaceToGet)) { list.Add(_reader); } return list; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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