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CSharpEntityTypeGenerator.cs
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CSharpEntityTypeGenerator.cs
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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using JetBrains.Annotations;
using Microsoft.EntityFrameworkCore.Design;
using Microsoft.EntityFrameworkCore.Design.Internal;
using Microsoft.EntityFrameworkCore.Internal;
using Microsoft.EntityFrameworkCore.Metadata;
using Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal;
using Microsoft.EntityFrameworkCore.Metadata.Internal;
using Microsoft.EntityFrameworkCore.Utilities;
namespace Microsoft.EntityFrameworkCore.Scaffolding.Internal
{
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
public class CSharpEntityTypeGenerator : ICSharpEntityTypeGenerator
{
private readonly ICSharpHelper _code;
private IndentedStringBuilder _sb;
private bool _useDataAnnotations;
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
public CSharpEntityTypeGenerator(
[NotNull] ICSharpHelper cSharpHelper)
{
Check.NotNull(cSharpHelper, nameof(cSharpHelper));
_code = cSharpHelper;
}
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
public virtual string WriteCode(IEntityType entityType, string @namespace, bool useDataAnnotations)
{
Check.NotNull(entityType, nameof(entityType));
Check.NotNull(@namespace, nameof(@namespace));
_sb = new IndentedStringBuilder();
_useDataAnnotations = useDataAnnotations;
_sb.AppendLine("using System;");
_sb.AppendLine("using System.Collections.Generic;");
if (_useDataAnnotations)
{
_sb.AppendLine("using System.ComponentModel.DataAnnotations;");
_sb.AppendLine("using System.ComponentModel.DataAnnotations.Schema;");
}
foreach (var ns in entityType.GetProperties()
.SelectMany(p => p.ClrType.GetNamespaces())
.Where(ns => ns != "System" && ns != "System.Collections.Generic")
.Distinct()
.OrderBy(x => x, new NamespaceComparer()))
{
_sb.AppendLine($"using {ns};");
}
_sb.AppendLine();
_sb.AppendLine($"namespace {@namespace}");
_sb.AppendLine("{");
using (_sb.Indent())
{
GenerateClass(entityType);
}
_sb.AppendLine("}");
return _sb.ToString();
}
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
protected virtual void GenerateClass(
[NotNull] IEntityType entityType)
{
Check.NotNull(entityType, nameof(entityType));
if (_useDataAnnotations)
{
GenerateEntityTypeDataAnnotations(entityType);
}
_sb.AppendLine($"public partial class {entityType.Name}");
_sb.AppendLine("{");
using (_sb.Indent())
{
GenerateConstructor(entityType);
GenerateProperties(entityType);
GenerateNavigationProperties(entityType);
}
_sb.AppendLine("}");
}
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
protected virtual void GenerateEntityTypeDataAnnotations(
[NotNull] IEntityType entityType)
{
Check.NotNull(entityType, nameof(entityType));
GenerateTableAttribute(entityType);
}
private void GenerateTableAttribute(IEntityType entityType)
{
var tableName = entityType.Relational().TableName;
var schema = entityType.Relational().Schema;
var defaultSchema = entityType.Model.Relational().DefaultSchema;
var schemaParameterNeeded = schema != null && schema != defaultSchema;
var tableAttributeNeeded = schemaParameterNeeded || tableName != null && tableName != entityType.Scaffolding().DbSetName;
if (tableAttributeNeeded)
{
var tableAttribute = new AttributeWriter(nameof(TableAttribute));
tableAttribute.AddParameter(_code.Literal(tableName));
if (schemaParameterNeeded)
{
tableAttribute.AddParameter($"{nameof(TableAttribute.Schema)} = {_code.Literal(schema)}");
}
_sb.AppendLine(tableAttribute.ToString());
}
}
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
protected virtual void GenerateConstructor(
[NotNull] IEntityType entityType)
{
Check.NotNull(entityType, nameof(entityType));
var collectionNavigations = entityType.GetNavigations().Where(n => n.IsCollection()).ToList();
if (collectionNavigations.Count > 0)
{
_sb.AppendLine($"public {entityType.Name}()");
_sb.AppendLine("{");
using (_sb.Indent())
{
foreach (var navigation in collectionNavigations)
{
_sb.AppendLine($"{navigation.Name} = new HashSet<{navigation.GetTargetType().Name}>();");
}
}
_sb.AppendLine("}");
_sb.AppendLine();
}
}
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
protected virtual void GenerateProperties(
[NotNull] IEntityType entityType)
{
Check.NotNull(entityType, nameof(entityType));
foreach (var property in entityType.GetProperties().OrderBy(p => p.Scaffolding().ColumnOrdinal))
{
if (_useDataAnnotations)
{
GeneratePropertyDataAnnotations(property);
}
_sb.AppendLine($"public {_code.Reference(property.ClrType)} {property.Name} {{ get; set; }}");
}
}
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
protected virtual void GeneratePropertyDataAnnotations(
[NotNull] IProperty property)
{
Check.NotNull(property, nameof(property));
GenerateKeyAttribute(property);
GenerateRequiredAttribute(property);
GenerateColumnAttribute(property);
GenerateMaxLengthAttribute(property);
}
private void GenerateKeyAttribute(IProperty property)
{
var key = property.AsProperty().PrimaryKey;
if (key?.Properties.Count == 1)
{
if (key is Key concreteKey
&& key.Properties.SequenceEqual(new KeyDiscoveryConvention(null).DiscoverKeyProperties(concreteKey.DeclaringEntityType, concreteKey.DeclaringEntityType.GetProperties().ToList())))
{
return;
}
if (key.Relational().Name != ConstraintNamer.GetDefaultName(key))
{
return;
}
_sb.AppendLine(new AttributeWriter(nameof(KeyAttribute)));
}
}
private void GenerateColumnAttribute(IProperty property)
{
var columnName = property.Relational().ColumnName;
var columnType = property.GetConfiguredColumnType();
var delimitedColumnName = columnName != null && columnName != property.Name ? _code.Literal(columnName) : null;
var delimitedColumnType = columnType != null ? _code.Literal(columnType) : null;
if ((delimitedColumnName ?? delimitedColumnType) != null)
{
var columnAttribute = new AttributeWriter(nameof(ColumnAttribute));
if (delimitedColumnName != null)
{
columnAttribute.AddParameter(delimitedColumnName);
}
if (delimitedColumnType != null)
{
columnAttribute.AddParameter($"{nameof(ColumnAttribute.TypeName)} = {delimitedColumnType}");
}
_sb.AppendLine(columnAttribute);
}
}
private void GenerateMaxLengthAttribute(IProperty property)
{
var maxLength = property.GetMaxLength();
if (maxLength.HasValue)
{
var lengthAttribute = new AttributeWriter(
property.ClrType == typeof(string)
? nameof(StringLengthAttribute)
: nameof(MaxLengthAttribute));
lengthAttribute.AddParameter(_code.Literal(maxLength.Value));
_sb.AppendLine(lengthAttribute.ToString());
}
}
private void GenerateRequiredAttribute(IProperty property)
{
if (!property.IsNullable
&& property.ClrType.IsNullableType()
&& !property.IsPrimaryKey())
{
_sb.AppendLine(new AttributeWriter(nameof(RequiredAttribute)).ToString());
}
}
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
protected virtual void GenerateNavigationProperties(
[NotNull] IEntityType entityType)
{
Check.NotNull(entityType, nameof(entityType));
var sortedNavigations = entityType.GetNavigations()
.OrderBy(n => n.IsDependentToPrincipal() ? 0 : 1)
.ThenBy(n => n.IsCollection() ? 1 : 0);
if (sortedNavigations.Any())
{
_sb.AppendLine();
foreach (var navigation in sortedNavigations)
{
if (_useDataAnnotations)
{
GenerateNavigationDataAnnotations(navigation);
}
var referencedTypeName = navigation.GetTargetType().Name;
var navigationType = navigation.IsCollection() ? $"ICollection<{referencedTypeName}>" : referencedTypeName;
_sb.AppendLine($"public {navigationType} {navigation.Name} {{ get; set; }}");
}
}
}
private void GenerateNavigationDataAnnotations(INavigation navigation)
{
GenerateForeignKeyAttribute(navigation);
GenerateInversePropertyAttribute(navigation);
}
private void GenerateForeignKeyAttribute(INavigation navigation)
{
if (navigation.IsDependentToPrincipal())
{
if (navigation.ForeignKey.PrincipalKey.IsPrimaryKey())
{
var foreignKeyAttribute = new AttributeWriter(nameof(ForeignKeyAttribute));
foreignKeyAttribute.AddParameter(
_code.Literal(
string.Join(",", navigation.ForeignKey.Properties.Select(p => p.Name))));
_sb.AppendLine(foreignKeyAttribute.ToString());
}
}
}
private void GenerateInversePropertyAttribute(INavigation navigation)
{
if (navigation.ForeignKey.PrincipalKey.IsPrimaryKey())
{
var inverseNavigation = navigation.FindInverse();
if (inverseNavigation != null)
{
var inversePropertyAttribute = new AttributeWriter(nameof(InversePropertyAttribute));
inversePropertyAttribute.AddParameter(_code.Literal(inverseNavigation.Name));
_sb.AppendLine(inversePropertyAttribute.ToString());
}
}
}
private class AttributeWriter
{
private readonly string _attibuteName;
private readonly List<string> _parameters = new List<string>();
public AttributeWriter([NotNull] string attributeName)
{
Check.NotEmpty(attributeName, nameof(attributeName));
_attibuteName = attributeName;
}
public void AddParameter([NotNull] string parameter)
{
Check.NotEmpty(parameter, nameof(parameter));
_parameters.Add(parameter);
}
public override string ToString()
=> "[" + (_parameters.Count == 0
? StripAttribute(_attibuteName)
: StripAttribute(_attibuteName) + "(" + string.Join(", ", _parameters) + ")") + "]";
private static string StripAttribute([NotNull] string attributeName)
=> attributeName.EndsWith("Attribute", StringComparison.Ordinal)
? attributeName.Substring(0, attributeName.Length - 9)
: attributeName;
}
}
}