MetadataUtil.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntityDesign / Design / System / Data / Entity / Design / Common / MetadataUtil.cs / 1305376 / MetadataUtil.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  	 [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System; 
using System.Collections.Generic;
using System.Text;
using System.Data.Metadata.Edm;
using System.Xml; 
using System.Data.Common;
using System.Reflection; 
using System.IO; 
using System.Diagnostics;
using System.Collections; 
using System.Globalization;
using System.Linq;

namespace System.Data.Entity.Design.Common 
{
    internal static class MetadataUtil 
    { 
        private const string s_defaultDelimiter = ", ";
 
        internal static bool IsStoreType(GlobalItem item)
        {
            return item.DataSpace == DataSpace.SSpace;
        } 

        internal static DbProviderServices GetProviderServices(DbProviderFactory factory) 
        { 
            EDesignUtil.CheckArgumentNull(factory, "factory");
 
            IServiceProvider serviceProvider = factory as IServiceProvider;
            if (serviceProvider == null)
            {
                throw MetadataUtil.ProviderIncompatible(System.Data.Entity.Design.Strings.EntityClient_DoesNotImplementIServiceProvider( 
                    factory.GetType().ToString()));
            } 
 
            DbProviderServices providerServices = serviceProvider.GetService(typeof(DbProviderServices)) as DbProviderServices;
            if (providerServices == null) 
            {
                throw MetadataUtil.ProviderIncompatible(
                    System.Data.Entity.Design.Strings.EntityClient_ReturnedNullOnProviderMethod(
                        "GetService", 
                        factory.GetType().ToString()));
            } 
            return providerServices; 
        }
 
        static internal ProviderIncompatibleException ProviderIncompatible(string error)
        {
            ProviderIncompatibleException e = new ProviderIncompatibleException(error);
            return e; 
        }
 
        ///  
        /// Check if all the SchemaErrors have the serverity of SchemaErrorSeverity.Warning
        ///  
        /// 
        /// 
        internal static bool CheckIfAllErrorsAreWarnings(IList schemaErrors)
        { 
            int length = schemaErrors.Count;
            for (int i = 0; i < length; ++i) 
            { 
                EdmSchemaError error = schemaErrors[i];
                if (error.Severity != EdmSchemaErrorSeverity.Warning) 
                {
                    return false;
                }
            } 
            return true;
        } 
 
        /// 
        ///   This private static method checks a string to make sure that it is not empty. 
        ///   Comparing with String.Empty is not sufficient since a string with nothing
        ///   but white space isn't considered "empty" by that rationale.
        /// 
        internal static bool IsNullOrEmptyOrWhiteSpace(string value) 
        {
            return IsNullOrEmptyOrWhiteSpace(value, 0); 
        } 

        internal static bool IsNullOrEmptyOrWhiteSpace(string value, int offset) 
        {
            // don't use Trim(), which will copy the string, which may be large, just to test for emptyness
            //return String.IsNullOrEmpty(value) || String.IsNullOrEmpty(value.Trim());
            if (null != value) 
            {
                for (int i = offset; i < value.Length; ++i) 
                { 
                    if (!Char.IsWhiteSpace(value[i]))
                    { 
                        return false;
                    }
                }
            } 
            return true;
        } 
 
        // separate implementation from IsNullOrEmptyOrWhiteSpace(string, int) because that one will
        // pick up the jit optimization to avoid boundary checks and the this won't is unknown (most likely not) 
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")] // referenced by System.Data.Entity.Design.dll
        internal static bool IsNullOrEmptyOrWhiteSpace(string value, int offset, int length)
        {
            // don't use Trim(), which will copy the string, which may be large, just to test for emptyness 
            //return String.IsNullOrEmpty(value) || String.IsNullOrEmpty(value.Trim());
            if (null != value) 
            { 
                length = Math.Min(value.Length, length);
                for (int i = offset; i < length; ++i) 
                {
                    if (!Char.IsWhiteSpace(value[i]))
                    {
                        return false; 
                    }
                } 
            } 
            return true;
        } 

        internal static string MembersToCommaSeparatedString(IEnumerable members)
        {
            StringBuilder builder = new StringBuilder(); 
            builder.Append("{");
            MetadataUtil.ToCommaSeparatedString(builder, members); 
            builder.Append("}"); 
            return builder.ToString();
        } 

        internal static void ToCommaSeparatedString(StringBuilder builder, IEnumerable list)
        {
            ToSeparatedStringPrivate(builder, list, s_defaultDelimiter, string.Empty, false); 
        }
 
        // effects: Converts the list to a list of strings, sorts its (if 
        // toSort is true) and then converts to a string separated by
        // "separator" with "nullValue" used for null values. 
        private static void ToSeparatedStringPrivate(StringBuilder stringBuilder, IEnumerable list, string separator,
                                                     string nullValue, bool toSort)
        {
            if (null == list) 
            {
                return; 
            } 
            bool isFirst = true;
            // Get the list of strings first 
            List elementStrings = new List();
            foreach (object element in list)
            {
                string str; 
                // Get the element or its default null value
                if (element == null) 
                { 
                    str = nullValue;
                } 
                else
                {
                    str = FormatInvariant("{0}", element);
                } 
                elementStrings.Add(str);
            } 
 
            if (toSort == true)
            { 
                // Sort the list
                elementStrings.Sort(StringComparer.Ordinal);
            }
 
            // Now add the strings to the stringBuilder
            foreach (string str in elementStrings) 
            { 
                if (false == isFirst)
                { 
                    stringBuilder.Append(separator);
                }
                stringBuilder.Append(str);
                isFirst = false; 
            }
        } 
 
        internal static string FormatInvariant(string format, params object[] args)
        { 
            Debug.Assert(args.Length > 0, "Formatting utilities must be called with at least one argument");
            return String.Format(CultureInfo.InvariantCulture, format, args);
        }
 
        /// 
        /// replace troublesome xml characters with equivalent entities 
        ///  
        /// text that make have characters troublesome in xml
        /// text with troublesome characters replaced with equivalent entities 
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")] // referenced by System.Data.Entity.Design.dll
        internal static string Entityize(string text)
        {
            if (string.IsNullOrEmpty(text)) 
                return "";
 
            text = text.Replace("&", "&"); 
            text = text.Replace("<", "<").Replace(">", ">");
            return text.Replace("\'", "'").Replace("\"", """); 
        }

        internal static bool TrySplitExtendedMetadataPropertyName(string name, out string xmlNamespaceUri, out string attributeName)
        { 
            int pos = name.LastIndexOf(':');
            if (pos < 0 || name.Length <= pos + 1) 
            { 
                Debug.Fail("the name is not in the form we expect");
                xmlNamespaceUri = null; 
                attributeName = null;
                return false;
            }
 
            xmlNamespaceUri = name.Substring(0, pos);
            attributeName = name.Substring(pos + 1, (name.Length - 1) - pos); 
            return true; 
        }
 
        static private readonly Type StackOverflowType = typeof(System.StackOverflowException);
        static private readonly Type OutOfMemoryType = typeof(System.OutOfMemoryException);
        static private readonly Type ThreadAbortType = typeof(System.Threading.ThreadAbortException);
        static private readonly Type NullReferenceType = typeof(System.NullReferenceException); 
        static private readonly Type AccessViolationType = typeof(System.AccessViolationException);
        static private readonly Type SecurityType = typeof(System.Security.SecurityException); 
 
        internal static bool IsCatchableExceptionType(Exception e)
        { 
            // a 'catchable' exception is defined by what it is not.
            Debug.Assert(e != null, "Unexpected null exception!");
            Type type = e.GetType();
 
            return ((type != StackOverflowType) &&
                     (type != OutOfMemoryType) && 
                     (type != ThreadAbortType) && 
                     (type != NullReferenceType) &&
                     (type != AccessViolationType) && 
                     !SecurityType.IsAssignableFrom(type));
        }

        ///  
        /// Returns the single error message from the list of errors
        ///  
        ///  
        /// 
        static internal string CombineErrorMessage(IEnumerable errors) 
        {
            Debug.Assert(errors != null);
            StringBuilder sb = new StringBuilder(System.Environment.NewLine);
            int count = 0; 
            foreach (System.Data.Metadata.Edm.EdmSchemaError error in errors)
            { 
                //Don't append a new line at the beginning of the messages 
                if ((count++) != 0)
                { 
                    sb.Append(System.Environment.NewLine);
                }
                sb.Append(error.ToString());
 
            }
            Debug.Assert(count != 0, "Empty Error List"); 
            return sb.ToString(); 
        }
 
        internal static void DisposeXmlReaders(IEnumerable xmlReaders)
        {
            Debug.Assert(xmlReaders != null);
 
            foreach (XmlReader xmlReader in xmlReaders)
            { 
                ((IDisposable)xmlReader).Dispose(); 
            }
        } 

        internal static bool IsCollectionType(GlobalItem item)
        {
            return (BuiltInTypeKind.CollectionType == item.BuiltInTypeKind); 
        }
 
        internal static bool IsComplexType(EdmType type) 
        {
            return (BuiltInTypeKind.ComplexType == type.BuiltInTypeKind); 
        }

        internal static bool IsPrimitiveType(EdmType type)
        { 
            return (BuiltInTypeKind.PrimitiveType == type.BuiltInTypeKind);
        } 
 
        internal static bool IsEntitySet(EntitySetBase entitySetBase)
        { 
            return BuiltInTypeKind.EntitySet == entitySetBase.BuiltInTypeKind;
        }

        internal static bool IsValidKeyType(Version entityFrameworkVersion, PrimitiveTypeKind kind) 
        {
            if (EntityFrameworkVersions.Version1 == entityFrameworkVersion) 
            { 
                return kind != PrimitiveTypeKind.Binary;
            } 
            else
            {
                // From V2 onwards, Binary key properties are supported
                return true; 
            }
        } 
 
        /// 
        /// determines if type is of EnumerationType. 
        /// 
        /// 
        /// 
        internal static bool IsEnumerationType(EdmType type) 
        {
            return (BuiltInTypeKind.EnumType == type.BuiltInTypeKind); 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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