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//---------------------------------------------------------------------
// <copyright file="MetadataArtifactLoaderResource.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//
// @owner Microsoft
// @backupOwner Microsoft
//---------------------------------------------------------------------
namespace System.Data.Metadata.Edm
{
using System.Collections.Generic;
using System.Data.EntityModel.SchemaObjectModel;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Xml;
/// <summary>
/// This class represents one resource item to be loaded from an assembly.
/// </summary>
internal class MetadataArtifactLoaderResource : MetadataArtifactLoader, IComparable
{
private readonly bool _alreadyLoaded = false;
private readonly Assembly _assembly;
private readonly string _resourceName;
/// <summary>
/// Constructor - loads the resource stream
/// </summary>
/// <param name="path">The path to the resource to load</param>
/// <param name="uriRegistry">The global registry of URIs</param>
internal MetadataArtifactLoaderResource(Assembly assembly, string resourceName, ICollection<string> uriRegistry)
{
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);
}
}
/// <summary>
/// Implementation of IComparable.CompareTo()
/// </summary>
/// <param name="obj">The object to compare to</param>
/// <returns>0 if the loaders are "equal" (i.e., have the same _path value)</returns>
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;
}
/// <summary>
/// Equals() returns true if the objects have the same _path value
/// </summary>
/// <param name="obj">The object to compare to</param>
/// <returns>true if the objects have the same _path value</returns>
public override bool Equals(object obj)
{
return this.CompareTo(obj) == 0;
}
/// <summary>
/// GetHashCode override that defers the result to the _path member variable.
/// </summary>
/// <returns></returns>
public override int GetHashCode()
{
return Path.GetHashCode();
}
public override void CollectFilePermissionPaths(List<string> paths, DataSpace spaceToGet)
{
// does not apply
}
/// <summary>
/// Get paths to artifacts for a specific DataSpace.
/// </summary>
/// <param name="spaceToGet">The DataSpace for the artifacts of interest</param>
/// <returns>A List of strings identifying paths to all artifacts for a specific DataSpace</returns>
public override List<string> GetPaths(DataSpace spaceToGet)
{
List<string> list = new List<string>();
if (!_alreadyLoaded && MetadataArtifactLoader.IsArtifactOfDataSpace(Path, spaceToGet))
{
list.Add(Path);
}
return list;
}
/// <summary>
/// Get paths to all artifacts
/// </summary>
/// <returns>A List of strings identifying paths to all resources</returns>
public override List<string> GetPaths()
{
List<string> list = new List<string>();
if (!_alreadyLoaded)
{
list.Add(Path);
}
return list;
}
/// <summary>
/// Create and return an XmlReader around the resource represented by this instance.
/// </summary>
/// <returns>A List of XmlReaders for all resources</returns>
public override List<XmlReader> GetReaders(Dictionary<MetadataArtifactLoader, XmlReader> sourceDictionary)
{
List<XmlReader> list = new List<XmlReader>();
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;
}
/// <summary>
/// Create and return an XmlReader around the resource represented by this instance
/// if it is of the requested DataSpace type.
/// </summary>
/// <param name="spaceToGet">The DataSpace corresponding to the requested artifacts</param>
/// <returns>A List of XmlReader objects</returns>
public override List<XmlReader> CreateReaders(DataSpace spaceToGet)
{
List<XmlReader> list = new List<XmlReader>();
if (!_alreadyLoaded)
{
if (MetadataArtifactLoader.IsArtifactOfDataSpace(Path, spaceToGet))
{
XmlReader reader = CreateReader();
list.Add(reader);
}
}
return list;
}
/// <summary>
/// This method parses the path to the resource and attempts to load it.
/// The method also accounts for the wildcard assembly name.
/// </summary>
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;
}
}
}
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