MetadataArtifactLoader.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Metadata / MetadataArtifactLoader.cs / 1305376 / MetadataArtifactLoader.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.Data.Entity;
using System.Data.Metadata;
using System.Runtime.Versioning; 

 
namespace System.Data.Metadata.Edm 
{
    ///  
    /// This is the base class for the resource metadata artifact loader; derived
    /// classes enacpsulate a single resource as well as collections of resources,
    /// along the lines of the Composite pattern.
    ///  
    internal abstract class MetadataArtifactLoader
    { 
        protected readonly static string resPathPrefix    = @"res://"; 
        protected readonly static string resPathSeparator = @"/";
        protected readonly static string altPathSeparator = @"\"; 
        protected readonly static string wildcard         = @"*";

        /// 
        /// Read-only access to the resource/file path 
        /// 
        public abstract string Path{ get; } 
        public abstract void CollectFilePermissionPaths(List paths, DataSpace spaceToGet); 

        ///  
        /// This enum is used to indicate the level of extension check to be perfoemed
        /// on a metadata URI.
        /// 
        public enum ExtensionCheck 
        {
            ///  
            /// Do not perform any extension check 
            /// 
            None = 0, 

            /// 
            /// Check the extension against a specific value
            ///  
            Specific,
 
            ///  
            /// Check the extension against the set of acceptable extensions
            ///  
            All
        }

        [ResourceExposure(ResourceScope.Machine)] //Exposes the file name which is a Machine resource 
        [ResourceConsumption(ResourceScope.Machine)] //For Create method call. But the path is not created in this method.
        public static MetadataArtifactLoader Create(string path, 
                                                    ExtensionCheck extensionCheck, 
                                                    string validExtension,
                                                    ICollection uriRegistry) 
        {
            return Create(path, extensionCheck, validExtension, uriRegistry, new DefaultAssemblyResolver());
        }
        ///  
        /// Factory method to create an artifact loader. This is where an appropriate
        /// subclass of MetadataArtifactLoader is created, depending on the kind of 
        /// resource it will encapsulate. 
        /// 
        /// The path to the resource(s) to be loaded 
        /// Any URI extension checks to perform
        /// A specific extension for an artifact resource
        /// The global registry of URIs
        ///  
        /// A concrete instance of an artifact loader.
        [ResourceExposure(ResourceScope.Machine)] //Exposes the file name which is a Machine resource 
        [ResourceConsumption(ResourceScope.Machine)] //For CheckArtifactExtension method call. But the path is not created in this method. 
        internal static MetadataArtifactLoader Create(string path,
                                                    ExtensionCheck extensionCheck, 
                                                    string validExtension,
                                                    ICollection uriRegistry,
                                                    MetadataArtifactAssemblyResolver resolver)
        { 
            Debug.Assert(path != null);
            Debug.Assert(resolver != null); 
 
            // res:// -based artifacts
            // 
            if (MetadataArtifactLoader.PathStartsWithResPrefix(path))
            {
                return MetadataArtifactLoaderCompositeResource.CreateResourceLoader(path, extensionCheck, validExtension, uriRegistry, resolver);
            } 

            // Files and Folders 
            // 
            string normalizedPath = MetadataArtifactLoader.NormalizeFilePaths(path);
            if (Directory.Exists(normalizedPath)) 
            {
                return new MetadataArtifactLoaderCompositeFile(normalizedPath, uriRegistry);
            }
            else if (File.Exists(normalizedPath)) 
            {
                switch (extensionCheck) 
                { 
                    case ExtensionCheck.Specific:
                        CheckArtifactExtension(normalizedPath, validExtension); 
                        break;

                    case ExtensionCheck.All:
                        if (!MetadataArtifactLoader.IsValidArtifact(normalizedPath)) 
                        {
                            throw EntityUtil.Metadata(Strings.InvalidMetadataPath); 
                        } 
                        break;
                } 

                return new MetadataArtifactLoaderFile(normalizedPath, uriRegistry);
            }
 
            throw EntityUtil.Metadata(Strings.InvalidMetadataPath);
        } 
 
        /// 
        /// Factory method to create an aggregating artifact loader, one that encapsulates 
        /// multiple collections.
        /// 
        /// The list of collections to be aggregated
        /// A concrete instance of an artifact loader. 
        public static MetadataArtifactLoader Create(List allCollections)
        { 
            return new MetadataArtifactLoaderComposite(allCollections); 
        }
 
        /// 
        /// Helper method that wraps a list of file paths in MetadataArtifactLoader instances.
        /// 
        /// The list of file paths to wrap 
        /// An acceptable extension for the file
        /// An instance of MetadataArtifactLoader 
        [ResourceExposure(ResourceScope.Machine)] //Exposes the file names which are a Machine resource 
        [ResourceConsumption(ResourceScope.Machine)] //For CreateCompositeFromFilePaths method call. But the path is not created in this method.
        public static MetadataArtifactLoader CreateCompositeFromFilePaths(IEnumerable filePaths, string validExtension) 
        {
            Debug.Assert(!string.IsNullOrEmpty(validExtension));

            return CreateCompositeFromFilePaths(filePaths, validExtension, new DefaultAssemblyResolver()); 
        }
 
        [ResourceExposure(ResourceScope.Machine)] //Exposes the file names which are a Machine resource 
        [ResourceConsumption(ResourceScope.Machine)] //For Create method call. But the paths are not created in this method.
        internal static MetadataArtifactLoader CreateCompositeFromFilePaths(IEnumerable filePaths, string validExtension, MetadataArtifactAssemblyResolver resolver) 
        {
            ExtensionCheck extensionCheck;
            if (string.IsNullOrEmpty(validExtension))
            { 
                extensionCheck = ExtensionCheck.All;
            } 
            else 
            {
                extensionCheck = ExtensionCheck.Specific; 
            }

            List loaders = new List();
 
            // The following set is used to remove duplicate paths from the incoming array
            HashSet uriRegistry = new HashSet(StringComparer.OrdinalIgnoreCase); 
 
            foreach(string path in filePaths)
            { 
                if (string.IsNullOrEmpty(path))
                {
                    throw EntityUtil.Metadata(System.Data.Entity.Strings.NotValidInputPath,
                                              EntityUtil.CollectionParameterElementIsNullOrEmpty("filePaths")); 
                }
 
                string trimedPath = path.Trim(); 
                if (trimedPath.Length > 0)
                { 
                    loaders.Add(MetadataArtifactLoader.Create(
                                            trimedPath,
                                            extensionCheck,
                                            validExtension, 
                                            uriRegistry,
                                            resolver) 
                                        ); 
                }
            } 

            return MetadataArtifactLoader.Create(loaders);
        }
 
        /// 
        /// Helper method that wraps a collection of XmlReader objects in MetadataArtifactLoader 
        /// instances. 
        /// 
        /// The collection of XmlReader objects to wrap 
        /// An instance of MetadataArtifactLoader
        public static MetadataArtifactLoader CreateCompositeFromXmlReaders(IEnumerable xmlReaders)
        {
            List loaders = new List(); 

            foreach (XmlReader reader in xmlReaders) 
            { 
                if (reader == null)
                { 
                    throw EntityUtil.CollectionParameterElementIsNull("xmlReaders");
                }

                loaders.Add(new MetadataArtifactLoaderXmlReaderWrapper(reader)); 
            }
 
            return MetadataArtifactLoader.Create(loaders); 
        }
 
        /// 
        /// If the path doesn't have the right extension, throw
        /// 
        /// The path to the resource 
        /// 
        internal static void CheckArtifactExtension(string path, string validExtension) 
        { 
            Debug.Assert(!string.IsNullOrEmpty(path));
            Debug.Assert(!string.IsNullOrEmpty(validExtension)); 

            string extension = GetExtension(path);
            if (!extension.Equals(validExtension, StringComparison.OrdinalIgnoreCase))
            { 
                throw EntityUtil.Metadata(Strings.InvalidFileExtension(path, extension, validExtension));
            } 
        } 

        ///  
        /// Get paths to all artifacts, in the original, unexpanded form
        /// 
        /// A List of strings identifying paths to all resources
        public virtual List GetOriginalPaths() 
        {
            return new List(new string[] { Path }); 
        } 

        ///  
        /// Get paths to artifacts for a specific DataSpace, in the original, unexpanded
        /// form
        /// 
        /// The DataSpace for the artifacts of interest 
        /// A List of strings identifying paths to all artifacts for a specific DataSpace
        public virtual List GetOriginalPaths(DataSpace spaceToGet) 
        { 
            List list = new List();
            if (MetadataArtifactLoader.IsArtifactOfDataSpace(Path, spaceToGet)) 
            {
                list.Add(Path);
            }
            return list; 
        }
 
        public virtual bool IsComposite 
        {
            get 
            {
                return false;
            }
        } 
        /// 
        /// Get paths to all artifacts 
        ///  
        /// A List of strings identifying paths to all resources
        public abstract List GetPaths(); 

        /// 
        /// 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 abstract List GetPaths(DataSpace spaceToGet); 

        public List GetReaders() 
        {
            return GetReaders(null);
        }
        ///  
        /// Get XmlReaders for all resources
        ///  
        /// A List of XmlReaders for all resources 
        public abstract List GetReaders(Dictionary sourceDictionary);
 
        /// 
        /// Get XmlReaders for a specific DataSpace.
        /// 
        /// The DataSpace for the artifacts of interest 
        /// A List of XmlReader object
        public abstract List CreateReaders(DataSpace spaceToGet); 
 
        /// 
        /// Helper method to determine whether a given path to a resource 
        /// starts with the "res://" prefix.
        /// 
        /// The resource path to test.
        /// true if the path represents a resource location 
        internal static bool PathStartsWithResPrefix(string path)
        { 
            return path.StartsWith(MetadataArtifactLoader.resPathPrefix, StringComparison.OrdinalIgnoreCase); 
        }
 
        /// 
        /// Helper method to determine whether a resource identifies a C-Space
        /// artifact.
        ///  
        /// The resource path
        /// true if the resource identifies a C-Space artifact 
        protected static bool IsCSpaceArtifact(string resource) 
        {
            Debug.Assert(!string.IsNullOrEmpty(resource)); 

            string extn = GetExtension(resource);
            if (!string.IsNullOrEmpty(extn))
            { 
                return string.Compare(extn, XmlConstants.CSpaceSchemaExtension, StringComparison.OrdinalIgnoreCase) == 0;
            } 
            return false; 
        }
 
        /// 
        /// Helper method to determine whether a resource identifies an S-Space
        /// artifact.
        ///  
        /// The resource path
        /// true if the resource identifies an S-Space artifact 
        protected static bool IsSSpaceArtifact(string resource) 
        {
            Debug.Assert(!string.IsNullOrEmpty(resource)); 

            string extn = GetExtension(resource);
            if (!string.IsNullOrEmpty(extn))
            { 
                return string.Compare(extn, XmlConstants.SSpaceSchemaExtension, StringComparison.OrdinalIgnoreCase) == 0;
            } 
            return false; 
        }
 
        /// 
        /// Helper method to determine whether a resource identifies a CS-Space
        /// artifact.
        ///  
        /// The resource path
        /// true if the resource identifies a CS-Space artifact 
        protected static bool IsCSSpaceArtifact(string resource) 
        {
            Debug.Assert(!string.IsNullOrEmpty(resource)); 

            string extn = GetExtension(resource);
            if (!string.IsNullOrEmpty(extn))
            { 
                return string.Compare(extn, XmlConstants.CSSpaceSchemaExtension, StringComparison.OrdinalIgnoreCase) == 0;
            } 
            return false; 
        }
 
        // don't use Path.GetExtension because it is ok for the resource
        // name to have characters in it that would be illegal in a path (ie '<' is illegal in a path)
        // and when they do, Path.GetExtension throws and ArgumentException
        private static string GetExtension(string resource) 
        {
            if(String.IsNullOrEmpty(resource)) 
                return string.Empty; 

            int pos = resource.LastIndexOf('.'); 
            if (pos < 0)
                return string.Empty;

            return resource.Substring(pos); 
        }
 
 
        /// 
        /// Helper method to determine whether a resource identifies a valid artifact. 
        /// 
        /// The resource path
        /// true if the resource identifies a valid artifact
        internal static bool IsValidArtifact(string resource) 
        {
            Debug.Assert(!string.IsNullOrEmpty(resource)); 
 
            string extn = GetExtension(resource);
            if (!string.IsNullOrEmpty(extn)) 
            {
                return (
                    string.Compare(extn, XmlConstants.CSpaceSchemaExtension, StringComparison.OrdinalIgnoreCase) == 0 ||
                    string.Compare(extn, XmlConstants.SSpaceSchemaExtension, StringComparison.OrdinalIgnoreCase) == 0 || 
                    string.Compare(extn, XmlConstants.CSSpaceSchemaExtension, StringComparison.OrdinalIgnoreCase) == 0
                ); 
            } 
            return false;
        } 

        /// 
        /// This helper method accepts a resource URI and a value from the DataSpace enum
        /// and determines whether the resource identifies an artifact of that DataSpace. 
        /// 
        /// A URI to an artifact resource 
        /// A DataSpace enum value 
        /// true if the resource identifies an artifact of the specified DataSpace
        protected static bool IsArtifactOfDataSpace(string resource, DataSpace dataSpace) 
        {
            if (dataSpace == DataSpace.CSpace)
                return MetadataArtifactLoader.IsCSpaceArtifact(resource);
 
            if (dataSpace == DataSpace.SSpace)
                return MetadataArtifactLoader.IsSSpaceArtifact(resource); 
 
            if (dataSpace == DataSpace.CSSpace)
                return MetadataArtifactLoader.IsCSSpaceArtifact(resource); 

            Debug.Assert(false, "Invalid DataSpace specified.");
            return false;
        } 

        ///  
        /// Normalize a file path: 
        ///     1. Add backslashes if given a drive letter.
        ///     2. Resolve the '~' macro in a Web/ASP.NET environment. 
        ///     3. Expand the |DataDirectory| macro, if found in the argument.
        ///     4. Convert relative paths into absolute paths.
        /// 
        /// the path to normalize 
        /// The normalized file path
        [ResourceExposure(ResourceScope.Machine)] //Exposes the file name which is a Machine resource 
        [ResourceConsumption(ResourceScope.Machine)] //For Path.GetFullPath method call. But the path is not created in this method. 
        static internal string NormalizeFilePaths(string path)
        { 
            bool getFullPath = true;    // used to determine whether we need to invoke GetFullPath()

            if (!String.IsNullOrEmpty(path))
            { 
                path = path.Trim();
 
                // If the path starts with a '~' character, try to resolve it as a Web/ASP.NET 
                // application path.
                // 
                if (path.StartsWith(EdmConstants.WebHomeSymbol, StringComparison.Ordinal))
                {
                    AspProxy aspProxy = new AspProxy();
                    path = aspProxy.MapWebPath(path); 
                    getFullPath = false;
                } 
 
                if (path.Length == 2 && path[1] == System.IO.Path.VolumeSeparatorChar)
                { 
                    path = path + System.IO.Path.DirectorySeparatorChar;
                }
                else
                { 
                    // See if the path contains the |DataDirectory| macro that we need to
                    // expand. Note that ExpandDataDirectory() won't process the path unless 
                    // it begins with the macro. 
                    //
                    string datadir = null;  // this is what the macro expands to 
                    string fullPath = System.Data.Common.DbConnectionOptions.ExpandDataDirectory(
                            System.Data.EntityClient.EntityConnectionStringBuilder.MetadataParameterName,   // keyword ("Metadata")
                            path,                                                                           // value
                            ref datadir                                                                     // the expanded macro 
                        );
 
                    // ExpandDataDirectory() returns null if it doesn't find the macro in its 
                    // argument.
                    // 
                    if (fullPath != null)
                    {
                        path = fullPath;
                        getFullPath = false; 
                    }
                } 
            } 
            try
            { 
                if (getFullPath)
                {
                    path = System.IO.Path.GetFullPath(path);
                } 
            }
            catch (ArgumentException e) 
            { 
                throw EntityUtil.Metadata(System.Data.Entity.Strings.NotValidInputPath, e);
            } 
            catch (NotSupportedException e)
            {
                throw EntityUtil.Metadata(System.Data.Entity.Strings.NotValidInputPath, e);
            } 
            catch (PathTooLongException)
            { 
                throw EntityUtil.Metadata(System.Data.Entity.Strings.NotValidInputPath); 
            }
 
            return path;
        }

 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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MetadataArtifactLoader.cs source code in C# .NET

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