Datalayer T4 template for use with Generic Save (MVC 5)

Datalayer T4 template

/// T4 file to generate some basic methods for a datalayer class. I like to keep Entity Framework inside of the Datalayer only and leave a fairly simple set of methods exposed outside of it.
///Works with my Generic save class

<#@ template language="C#" debug="false" hostspecific="true"  compilerOptions="/langversion:6" #>
<#@ assembly name="System.Data.Entity" #>
<#@ assembly name="System.Data.Entity.Design" #>
<#@ import namespace="System.Text.RegularExpressions" #>
<#@ include file="EF6.Utility.CS.ttinclude"#>
<#@ import namespace="System.Data.Entity.Design" #>
<#@ import namespace="System.Data.Entity.Design.PluralizationServices" #>
<#@ output extension=".cs"#>
<#
const string inputFile = @"YourModel.edmx";
var textTransform = DynamicTextTransformation.Create(this);
var code = new CodeGenerationTools(this);
var ef = new MetadataTools(this);
var typeMapper = new TypeMapper(code, ef, textTransform.Errors);
var    fileManager = EntityFrameworkTemplateFileManager.Create(this);
var itemCollection = new EdmMetadataLoader(textTransform.Host, textTransform.Errors).CreateEdmItemCollection(inputFile);
var codeStringGenerator = new CodeStringGenerator(code, typeMapper, ef);
if (!typeMapper.VerifyCaseInsensitiveTypeUniqueness(typeMapper.GetAllGlobalItems(itemCollection), inputFile)){ return string.Empty;}
WriteHeader(codeStringGenerator, fileManager);
foreach (var entity in typeMapper.GetItemsToGenerate<EntityType>(itemCollection))
{
    fileManager.StartNewFile(entity.Name + ".cs");
    BeginNamespace(code);
#>
<#=codeStringGenerator.UsingDirectives(inHeader: false)#>using System.Linq;
using System.Threading.Tasks;
    
    <#=Accessibility.ForType(entity)#> <#=code.SpaceAfter(code.AbstractOption(entity))#>partial class <#=code.Escape(entity)#> : ICrud
{
<#
    var propertiesWithDefaultValues = typeMapper.GetPropertiesWithDefaultValues(entity);
    var collectionNavigationProperties = typeMapper.GetCollectionNavigationProperties(entity);
    var complexProperties = typeMapper.GetComplexProperties(entity);
    string pkname = "";
     foreach (var edmProperty in  typeMapper.GetSimpleProperties(entity))
     {
        if(ef.IsKey(edmProperty)) pkname = edmProperty.Name    ;
     }
    if (propertiesWithDefaultValues.Any() || collectionNavigationProperties.Any() || complexProperties.Any())
    {
#>
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
    public <#=code.Escape(entity)#>()
    {
    
<#
        foreach (var edmProperty in propertiesWithDefaultValues)
        {
#>
        this.<#=code.Escape(edmProperty)#> = <#=typeMapper.CreateLiteral(edmProperty.DefaultValue)#>;
<#
        }
        foreach (var navigationProperty in collectionNavigationProperties)
        {
#>
        this.<#=code.Escape(navigationProperty)#> = new HashSet<<#=typeMapper.GetTypeName(navigationProperty.ToEndMember.GetEntityType())#>>();
<#
        }
        foreach (var complexProperty in complexProperties)
        {
#>
        this.<#=code.Escape(complexProperty)#> = new <#=typeMapper.GetTypeName(complexProperty.TypeUsage)#>();
<#
        }
#>
    }
    
<#
    }
    CultureInfo ci = new CultureInfo("en-uk");
    PluralizationService ps = PluralizationService.CreateService(ci);
    string tableName = ps.Pluralize(entity.Name).Replace("Status", "Statuses");
    #>
        public static <#=entity.Name #> Find(int id) => _find(db => db.<#=tableName #>.Where(v => v.<#=pkname #> == id).FirstOrDefault());
        private static <#=entity.Name #> _find(Func<ModelEntities, <#=entity.Name #>> work) => work(new ModelEntities());
        public static async Task<<#=entity.Name #>> FindAsync(int? id) => await (new ModelEntities()).<#=tableName #>.FindAsync(id);
        public static List<<#=entity.Name #>> <#=entity.Name #>List() =>  (new ModelEntities()).<#=tableName #>.ToList();
        public static async Task<List<<#=entity.Name #>>> <#=entity.Name #>ListAsync() => await new Task<List<<#=entity.Name #>>>(() => (new ModelEntities()).<#=tableName #>.ToList());
<#
    var simpleProperties = typeMapper.GetSimpleProperties(entity);
    if (simpleProperties.Any())
    {
     foreach (var edmProperty in simpleProperties)
        {
#>
        <#=codeStringGenerator.Property(edmProperty)#>
<#
        }
    }
    if (complexProperties.Any())
    {
#>
<#
  foreach(var complexProperty in complexProperties)
        {
#>
        <#=codeStringGenerator.Property(complexProperty)#>
<#
        }
    }
    var navigationProperties = typeMapper.GetNavigationProperties(entity);
    if (navigationProperties.Any())
    {
#>
<#
        foreach (var navigationProperty in navigationProperties)
        {
            if (navigationProperty.ToEndMember.RelationshipMultiplicity == RelationshipMultiplicity.Many)
            {
#>
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
<#
            }
#>
        <#=codeStringGenerator.NavigationProperty(navigationProperty)#>
<#
        }
    }
#>
}
<#
    EndNamespace(code);
}
foreach (var complex in typeMapper.GetItemsToGenerate<ComplexType>(itemCollection))
{
    fileManager.StartNewFile(complex.Name + ".cs");
    BeginNamespace(code);
#>
<#=codeStringGenerator.UsingDirectives(inHeader: false, includeCollections: false)#>
<#=Accessibility.ForType(complex)#> partial class <#=code.Escape(complex)#>
{
<#
    var complexProperties = typeMapper.GetComplexProperties(complex);
    var propertiesWithDefaultValues = typeMapper.GetPropertiesWithDefaultValues(complex);
    if (propertiesWithDefaultValues.Any() || complexProperties.Any())
    {
#>
        public <#=code.Escape(complex)#>()
    {
<#
        foreach (var edmProperty in propertiesWithDefaultValues)
        {
#>
        this.<#=code.Escape(edmProperty)#> = <#=typeMapper.CreateLiteral(edmProperty.DefaultValue)#>;
<#
        }
        foreach (var complexProperty in complexProperties)
        {
#>
        this.<#=code.Escape(complexProperty)#> = new <#=typeMapper.GetTypeName(complexProperty.TypeUsage)#>();
<#
        }
#>
    }
<#
    }
    var simpleProperties = typeMapper.GetSimpleProperties(complex);
    if (simpleProperties.Any())
    {
        foreach(var edmProperty in simpleProperties)
        {
#>
        <#=codeStringGenerator.Property(edmProperty)#>
<#
        }
    }
    if (complexProperties.Any())
    {
#>
<#
        foreach(var edmProperty in complexProperties)
        {
#>
    <#=codeStringGenerator.Property(edmProperty)#>
    
<#
        }
    }
#>
}
<#
    EndNamespace(code);
}
foreach (var enumType in typeMapper.GetEnumItemsToGenerate(itemCollection))
{
    fileManager.StartNewFile(enumType.Name + ".cs");
    BeginNamespace(code);
#>
<#=codeStringGenerator.UsingDirectives(inHeader: false, includeCollections: false)#>
<#
    if (typeMapper.EnumIsFlags(enumType))
    {
#>
[Flags]
<#
    }
#>
<#=codeStringGenerator.EnumOpening(enumType)#>
{
<#
    var foundOne = false;
    
    foreach (MetadataItem member in typeMapper.GetEnumMembers(enumType))
    {
        foundOne = true;
#>
    <#=code.Escape(typeMapper.GetEnumMemberName(member))#> = <#=typeMapper.GetEnumMemberValue(member)#>,
<#
    }
    if (foundOne)
    {
        this.GenerationEnvironment.Remove(this.GenerationEnvironment.Length - 3, 1);
    }
#>
}
<#
    EndNamespace(code);
}
fileManager.Process();
#>
<#+
public void WriteHeader(CodeStringGenerator codeStringGenerator, EntityFrameworkTemplateFileManager fileManager)
{
    fileManager.StartHeader();
#>
//------------------------------------------------------------------------------
// <auto-generated>
// <#=CodeGenerationTools.GetResourceString("Template_GeneratedCodeCommentLine1")#>
//
// <#=CodeGenerationTools.GetResourceString("Template_GeneratedCodeCommentLine2")#>
// <#=CodeGenerationTools.GetResourceString("Template_GeneratedCodeCommentLine3")#>
// </auto-generated>
//------------------------------------------------------------------------------
<#=codeStringGenerator.UsingDirectives(inHeader: true)#>
<#+
    fileManager.EndBlock();
}
public void BeginNamespace(CodeGenerationTools code)
{
    var codeNamespace = code.VsNamespaceSuggestion();
    if (!String.IsNullOrEmpty(codeNamespace))
    {
#>
namespace <#=code.EscapeNamespace(codeNamespace)#>
{
<#+
        PushIndent("    ");
    }
}
public void EndNamespace(CodeGenerationTools code)
{
    if (!String.IsNullOrEmpty(code.VsNamespaceSuggestion()))
    {
        PopIndent();
#>
}
<#+
    }
}
public const string TemplateId = "CSharp_DbContext_Types_EF6";
public class CodeStringGenerator
{
    private readonly CodeGenerationTools _code;
    private readonly TypeMapper _typeMapper;
    private readonly MetadataTools _ef;
    public CodeStringGenerator(CodeGenerationTools code, TypeMapper typeMapper, MetadataTools ef)
    {
        ArgumentNotNull(code, "code");
        ArgumentNotNull(typeMapper, "typeMapper");
        ArgumentNotNull(ef, "ef");
        _code = code;
        _typeMapper = typeMapper;
        _ef = ef;
     }
public string Property(EdmProperty edmProperty)
    {
        //New code for generating attributes. Largely original by now :P
        var dataTypeAtt = GetDataTypeAttribute(edmProperty);
        string RequiredAttr = (!edmProperty.Nullable) ? "[Required(ErrorMessage=\"" +  FixName(_code.Escape(edmProperty))   + " is required\")]\n            " : "";        
        string MaxLenAttr = "";
        foreach (Facet facet in edmProperty.TypeUsage.Facets)
        {
            if (facet.Name == "MaxLength" && facet.Value != null && facet.IsUnbounded == false) MaxLenAttr = "[StringLength(" + facet.Value + ")]\n            ";
        }
        string DataTypeAttr =  (dataTypeAtt != String.Empty) ? dataTypeAtt + "\n            " : "";  
        
        if (_ef.IsKey(edmProperty)) {
            return string.Format(
            CultureInfo.InvariantCulture,
            "{6}{7}{8}{0} {1} {2} {{ {3}get; {4}set ; }} \n            int ICrud.ID {{ {3}get {{ return {5}; }} {4}set {{this.{5} = value ;}} }}",  
            Accessibility.ForProperty(edmProperty),
            _typeMapper.GetTypeName(edmProperty.TypeUsage),
            _code.Escape(edmProperty),
            _code.SpaceAfter(Accessibility.ForGetter(edmProperty)),
            _code.SpaceAfter(Accessibility.ForSetter(edmProperty)),
            edmProperty.Name,
            RequiredAttr,
            MaxLenAttr,
            DataTypeAttr);
                      
        } else {return string.Format(
            CultureInfo.InvariantCulture,
            "{5}{6}{7}{0} {1} {2} {{ {3}get; {4}set; }}",
            Accessibility.ForProperty(edmProperty),
            _typeMapper.GetTypeName(edmProperty.TypeUsage),
            _code.Escape(edmProperty),
            _code.SpaceAfter(Accessibility.ForGetter(edmProperty)),
            _code.SpaceAfter(Accessibility.ForSetter(edmProperty)),
            RequiredAttr,
            MaxLenAttr,
            DataTypeAttr);}       
    }
    public string NavigationProperty(NavigationProperty navProp)
    {
        var endType = _typeMapper.GetTypeName(navProp.ToEndMember.GetEntityType());
        return string.Format(
            CultureInfo.InvariantCulture,
            "{0} {1} {2} {{ {3}get; {4}set; }}",
            AccessibilityAndVirtual(Accessibility.ForNavigationProperty(navProp)),
            navProp.ToEndMember.RelationshipMultiplicity == RelationshipMultiplicity.Many ? ("ICollection<" + endType + ">") : endType,
            _code.Escape(navProp),
            _code.SpaceAfter(Accessibility.ForGetter(navProp)),
            _code.SpaceAfter(Accessibility.ForSetter(navProp)));
    }
    
    public string AccessibilityAndVirtual(string accessibility) => accessibility + (accessibility != "private" ? " virtual" : "");
        
    public string EntityClassOpening(EntityType entity)
    {
        return string.Format(
            CultureInfo.InvariantCulture,
            "{0} {1}partial class {2}{3}",
            Accessibility.ForType(entity),
            _code.SpaceAfter(_code.AbstractOption(entity)),
            _code.Escape(entity),
            _code.StringBefore(" : ", _typeMapper.GetTypeName(entity.BaseType)));
    }
    
    public string EnumOpening(SimpleType enumType)
    {
        return string.Format(
            CultureInfo.InvariantCulture,
            "{0} enum {1} : {2}",
            Accessibility.ForType(enumType),
            _code.Escape(enumType),
            _code.Escape(_typeMapper.UnderlyingClrType(enumType)));
        }
    
    public void WriteFunctionParameters(EdmFunction edmFunction, Action<string, string, string, string> writeParameter)
    {
        var parameters = FunctionImportParameter.Create(edmFunction.Parameters, _code, _ef);
        foreach (var parameter in parameters.Where(p => p.NeedsLocalVariable))
        {
            var isNotNull = parameter.IsNullableOfT ? parameter.FunctionParameterName + ".HasValue" : parameter.FunctionParameterName + " != null";
            var notNullInit = "new ObjectParameter(\"" + parameter.EsqlParameterName + "\", " + parameter.FunctionParameterName + ")";
            var nullInit = "new ObjectParameter(\"" + parameter.EsqlParameterName + "\", typeof(" + TypeMapper.FixNamespaces(parameter.RawClrTypeName) + "))";
            writeParameter(parameter.LocalVariableName, isNotNull, notNullInit, nullInit);
        }
    }
    
    public string ComposableFunctionMethod(EdmFunction edmFunction, string modelNamespace)
    {
        var parameters = _typeMapper.GetParameters(edmFunction);
        
        return string.Format(
            CultureInfo.InvariantCulture,
            "{0} IQueryable<{1}> {2}({3})",
            AccessibilityAndVirtual(Accessibility.ForMethod(edmFunction)),
            _typeMapper.GetTypeName(_typeMapper.GetReturnType(edmFunction), modelNamespace),
            _code.Escape(edmFunction),
            string.Join(", ", parameters.Select(p => TypeMapper.FixNamespaces(p.FunctionParameterType) + " " + p.FunctionParameterName).ToArray()));
    }
    
    public string ComposableCreateQuery(EdmFunction edmFunction, string modelNamespace)
    {
        var parameters = _typeMapper.GetParameters(edmFunction);
        
        return string.Format(
            CultureInfo.InvariantCulture,
            "return ((IObjectContextAdapter)this).ObjectContext.CreateQuery<{0}>(\"[{1}].[{2}]({3})\"{4});",
            _typeMapper.GetTypeName(_typeMapper.GetReturnType(edmFunction), modelNamespace),
            edmFunction.NamespaceName,
            edmFunction.Name,
            string.Join(", ", parameters.Select(p => "@" + p.EsqlParameterName).ToArray()),
            _code.StringBefore(", ", string.Join(", ", parameters.Select(p => p.ExecuteParameterName).ToArray())));
    }
    
    public string FunctionMethod(EdmFunction edmFunction, string modelNamespace, bool includeMergeOption)
    {
        var parameters = _typeMapper.GetParameters(edmFunction);
        var returnType = _typeMapper.GetReturnType(edmFunction);
        var paramList = String.Join(", ", parameters.Select(p => TypeMapper.FixNamespaces(p.FunctionParameterType) + " " + p.FunctionParameterName).ToArray());
        if (includeMergeOption)  paramList = _code.StringAfter(paramList, ", ") + "MergeOption mergeOption";
        
        return string.Format(
            CultureInfo.InvariantCulture,
            "{0} {1} {2}({3})",
            AccessibilityAndVirtual(Accessibility.ForMethod(edmFunction)),
            returnType == null ? "int" : "ObjectResult<" + _typeMapper.GetTypeName(returnType, modelNamespace) + ">",
            _code.Escape(edmFunction),
            paramList);
    }
    
    public string ExecuteFunction(EdmFunction edmFunction, string modelNamespace, bool includeMergeOption)
    {
        var parameters = _typeMapper.GetParameters(edmFunction);
        var returnType = _typeMapper.GetReturnType(edmFunction);
        var callParams = _code.StringBefore(", ", String.Join(", ", parameters.Select(p => p.ExecuteParameterName).ToArray()));
        if (includeMergeOption)
        {
            callParams = ", mergeOption" + callParams;
        }
        
        return string.Format(
            CultureInfo.InvariantCulture,
            "return ((IObjectContextAdapter)this).ObjectContext.ExecuteFunction{0}(\"{1}\"{2});",
            returnType == null ? "" : "<" + _typeMapper.GetTypeName(returnType, modelNamespace) + ">",
            edmFunction.Name,
            callParams);
    }
    
    public string DbSet(EntitySet entitySet)
    {
        return string.Format(
            CultureInfo.InvariantCulture,
            "{0} virtual DbSet<{1}> {2} {{ get; set; }}",
            Accessibility.ForReadOnlyProperty(entitySet),
            _typeMapper.GetTypeName(entitySet.ElementType),
            _code.Escape(entitySet));
    }
    public string UsingDirectives(bool inHeader, bool includeCollections = true)
    {
        return inHeader == string.IsNullOrEmpty(_code.VsNamespaceSuggestion())
            ? string.Format(
                CultureInfo.InvariantCulture,
                "{0}using System;" +
                "using System.ComponentModel.DataAnnotations;{1}" +
                "{2}",
                inHeader ? Environment.NewLine : "",
                includeCollections ? (Environment.NewLine + "using System.Collections.Generic;") : "",
                inHeader ? "" : Environment.NewLine)
            : "";
    }
    
    public string FixName(string propName)
    {
        if (propName.ToLower() != "id" && propName.ToLower().EndsWith("id")) propName = propName.Replace("Id","").Replace("ID","");    
        return Regex.Replace(propName,"([A-Z])"," $1",RegexOptions.Compiled).Trim();
    }
    public string GetDataTypeAttribute(EdmProperty property)
    {
        var propLower = property.Name.ToLower();
        if (_ef.ClrType(property.TypeUsage) == typeof(System.DateTime))    return "[DataType(DataType.DateTime)]";
        if (propLower.Contains("phone")) return "[DataType(DataType.PhoneNumber)]";
        if (propLower.Contains("html")) return "[DataType(DataType.Html)]";
        if (propLower.Contains("email")) return "[DataType(DataType.EmailAddress)]";
        if (propLower.Contains("url"))        return "[DataType(DataType.Url)]";
        return String.Empty;
    }        
   
}
public class TypeMapper
{
    private const string ExternalTypeNameAttributeName = @"http://schemas.microsoft.com/ado/2006/04/codegeneration:ExternalTypeName";;
    private readonly System.Collections.IList _errors;
    private readonly CodeGenerationTools _code;
    private readonly MetadataTools _ef;
    public TypeMapper(CodeGenerationTools code, MetadataTools ef, System.Collections.IList errors)
    {
        ArgumentNotNull(code, "code");
        ArgumentNotNull(ef, "ef");
        ArgumentNotNull(errors, "errors");
        _code = code;
        _ef = ef;
        _errors = errors;
    }
    public static string FixNamespaces(string typeName)=>  typeName.Replace("System.Data.Spatial.", "System.Data.Entity.Spatial.");
    
    public string GetTypeName(TypeUsage typeUsage)=>  typeUsage == null ? null : GetTypeName(typeUsage.EdmType, _ef.IsNullable(typeUsage), modelNamespace: null);
    
    public string GetTypeName(EdmType edmType)=> GetTypeName(edmType, isNullable: null, modelNamespace: null);
    public string GetTypeName(TypeUsage typeUsage, string modelNamespace)=> typeUsage == null ? null : GetTypeName(typeUsage.EdmType, _ef.IsNullable(typeUsage), modelNamespace);
  
    public string GetTypeName(EdmType edmType, string modelNamespace)=> GetTypeName(edmType, isNullable: null, modelNamespace: modelNamespace);
    public string GetTypeName(EdmType edmType, bool? isNullable, string modelNamespace)
    {
        if (edmType == null)
        {
            return null;
        }
        var collectionType = edmType as CollectionType;
        if (collectionType != null)
        {
            return String.Format(CultureInfo.InvariantCulture, "ICollection<{0}>", GetTypeName(collectionType.TypeUsage, modelNamespace));
        }
        var typeName = _code.Escape(edmType.MetadataProperties
                                .Where(p => p.Name == ExternalTypeNameAttributeName)
                                .Select(p => (string)p.Value)
                                .FirstOrDefault())
            ?? (modelNamespace != null && edmType.NamespaceName != modelNamespace ?
                _code.CreateFullName(_code.EscapeNamespace(edmType.NamespaceName), _code.Escape(edmType)) :
                _code.Escape(edmType));
        if (edmType is StructuralType)
        {
            return typeName;
        }
        if (edmType is SimpleType)
        {
            var clrType = UnderlyingClrType(edmType);
            if (!IsEnumType(edmType))
            {
                typeName = _code.Escape(clrType);
            }
            typeName = FixNamespaces(typeName);
            return clrType.IsValueType && isNullable == true ?
                String.Format(CultureInfo.InvariantCulture, "Nullable<{0}>", typeName) :
                typeName;
        }
        throw new ArgumentException("edmType");
    }
    
    public Type UnderlyingClrType(EdmType edmType)
    {
        ArgumentNotNull(edmType, "edmType");
        var primitiveType = edmType as PrimitiveType;
        if (primitiveType != null)
        {
            return primitiveType.ClrEquivalentType;
        }
        if (IsEnumType(edmType))
        {
            return GetEnumUnderlyingType(edmType).ClrEquivalentType;
        }
        return typeof(object);
    }
    
    public object GetEnumMemberValue(MetadataItem enumMember)
    {
        ArgumentNotNull(enumMember, "enumMember");
        
        var valueProperty = enumMember.GetType().GetProperty("Value");
        return valueProperty == null ? null : valueProperty.GetValue(enumMember, null);
    }
    
    public string GetEnumMemberName(MetadataItem enumMember)
    {
        ArgumentNotNull(enumMember, "enumMember");
        
        var nameProperty = enumMember.GetType().GetProperty("Name");
        return nameProperty == null ? null : (string)nameProperty.GetValue(enumMember, null);
    }
    public System.Collections.IEnumerable GetEnumMembers(EdmType enumType)
    {
        ArgumentNotNull(enumType, "enumType");
        var membersProperty = enumType.GetType().GetProperty("Members");
        return membersProperty != null
            ? (System.Collections.IEnumerable)membersProperty.GetValue(enumType, null)
            : Enumerable.Empty<MetadataItem>();
    }
    
    public bool EnumIsFlags(EdmType enumType)
    {
        ArgumentNotNull(enumType, "enumType");
        
        var isFlagsProperty = enumType.GetType().GetProperty("IsFlags");
        return isFlagsProperty != null && (bool)isFlagsProperty.GetValue(enumType, null);
    }
    public bool IsEnumType(GlobalItem edmType)
    {
        ArgumentNotNull(edmType, "edmType");
        return edmType.GetType().Name == "EnumType";
    }
    public PrimitiveType GetEnumUnderlyingType(EdmType enumType)
    {
        ArgumentNotNull(enumType, "enumType");
        return (PrimitiveType)enumType.GetType().GetProperty("UnderlyingType").GetValue(enumType, null);
    }
    public string CreateLiteral(object value)
    {
        if (value == null || value.GetType() != typeof(TimeSpan)) return _code.CreateLiteral(value);
        return string.Format(CultureInfo.InvariantCulture, "new TimeSpan({0})", ((TimeSpan)value).Ticks);
    }
    
    public bool VerifyCaseInsensitiveTypeUniqueness(IEnumerable<string> types, string sourceFile)
    {
        ArgumentNotNull(types, "types");
        ArgumentNotNull(sourceFile, "sourceFile");
        
        var hash = new HashSet<string>(StringComparer.InvariantCultureIgnoreCase);
        if (types.Any(item => !hash.Add(item)))
        {
            _errors.Add(
                new CompilerError(sourceFile, -1, -1, "6023",
                    String.Format(CultureInfo.CurrentCulture, CodeGenerationTools.GetResourceString("Template_CaseInsensitiveTypeConflict"))));
            return false;
        }
        return true;
    }
    
    public IEnumerable<SimpleType> GetEnumItemsToGenerate(IEnumerable<GlobalItem> itemCollection) => GetItemsToGenerate<SimpleType>(itemCollection).Where(e => IsEnumType(e));
    
    public IEnumerable<T> GetItemsToGenerate<T>(IEnumerable<GlobalItem> itemCollection) where T: EdmType
    {
        return itemCollection
            .OfType<T>()
            .Where(i => !i.MetadataProperties.Any(p => p.Name == ExternalTypeNameAttributeName))
            .OrderBy(i => i.Name);
    }
    public IEnumerable<string> GetAllGlobalItems(IEnumerable<GlobalItem> itemCollection)
    {
        return itemCollection
            .Where(i => i is EntityType || i is ComplexType || i is EntityContainer || IsEnumType(i))
            .Select(g => GetGlobalItemName(g));
    }
    
    public string GetGlobalItemName(GlobalItem item) => item is EdmType ? ((EdmType)item).Name : ((EntityContainer)item).Name;
    
    public IEnumerable<EdmProperty> GetSimpleProperties(EntityType type)=>  type.Properties.Where(p => p.TypeUsage.EdmType is SimpleType && p.DeclaringType == type);
    
    public IEnumerable<EdmProperty> GetSimpleProperties(ComplexType type)=>  type.Properties.Where(p => p.TypeUsage.EdmType is SimpleType && p.DeclaringType == type);
    
    public IEnumerable<EdmProperty> GetComplexProperties(EntityType type)=> type.Properties.Where(p => p.TypeUsage.EdmType is ComplexType && p.DeclaringType == type);
    
    public IEnumerable<EdmProperty> GetComplexProperties(ComplexType type)=>  type.Properties.Where(p => p.TypeUsage.EdmType is ComplexType && p.DeclaringType == type);
    public IEnumerable<EdmProperty> GetPropertiesWithDefaultValues(EntityType type)=> type.Properties.Where(p => p.TypeUsage.EdmType is SimpleType && p.DeclaringType == type && p.DefaultValue != null);
    
    public IEnumerable<EdmProperty> GetPropertiesWithDefaultValues(ComplexType type)=> type.Properties.Where(p => p.TypeUsage.EdmType is SimpleType && p.DeclaringType == type && p.DefaultValue != null);
    public IEnumerable<NavigationProperty> GetNavigationProperties(EntityType type) => type.NavigationProperties.Where(np => np.DeclaringType == type);
        
    public IEnumerable<NavigationProperty> GetCollectionNavigationProperties(EntityType type) => type.NavigationProperties.Where(np => np.DeclaringType == type && np.ToEndMember.RelationshipMultiplicity == RelationshipMultiplicity.Many);
     
    public FunctionParameter GetReturnParameter(EdmFunction edmFunction)
    {
        ArgumentNotNull(edmFunction, "edmFunction");
        var returnParamsProperty = edmFunction.GetType().GetProperty("ReturnParameters");
        return returnParamsProperty == null
            ? edmFunction.ReturnParameter
            : ((IEnumerable<FunctionParameter>)returnParamsProperty.GetValue(edmFunction, null)).FirstOrDefault();
    }
    public bool IsComposable(EdmFunction edmFunction)
    {
        ArgumentNotNull(edmFunction, "edmFunction");
        var isComposableProperty = edmFunction.GetType().GetProperty("IsComposableAttribute");
        return isComposableProperty != null && (bool)isComposableProperty.GetValue(edmFunction, null);
    }
    public IEnumerable<FunctionImportParameter> GetParameters(EdmFunction edmFunction) => FunctionImportParameter.Create(edmFunction.Parameters, _code, _ef);
   
    public TypeUsage GetReturnType(EdmFunction edmFunction)
    {
        var returnParam = GetReturnParameter(edmFunction);
        return returnParam == null ? null : _ef.GetElementType(returnParam.TypeUsage);
    }
    
    public bool GenerateMergeOptionFunction(EdmFunction edmFunction, bool includeMergeOption)
    {
        var returnType = GetReturnType(edmFunction);
        return !includeMergeOption && returnType != null && returnType.EdmType.BuiltInTypeKind == BuiltInTypeKind.EntityType;
    }
}
public static void ArgumentNotNull<T>(T arg, string name) where T : class
{
    if (arg == null) throw new ArgumentNullException(name);
}
#>