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ModelMetadata.cs
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ModelMetadata.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.Linq;
using System.Reflection;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata;
using System.Collections.Generic;
namespace Microsoft.VisualStudio.Web.CodeGeneration.EntityFrameworkCore
{
// ToDo: This takes depedency on EF, that will conflict with
// app's EF dependency
public class ModelMetadata : IModelMetadata
{
private IPropertyMetadata[] _properties;
private IPropertyMetadata[] _primaryKeys;
private INavigationMetadata[] _navigations;
//Todo: Perhaps move the constructor to something line MetadataReader?
public ModelMetadata(IEntityType entityType, Type dbContextType)
{
if (entityType == null)
{
throw new ArgumentNullException(nameof(entityType));
}
if (dbContextType == null)
{
throw new ArgumentNullException(nameof(dbContextType));
}
EntityType = entityType;
DbContexType = dbContextType;
EntitySetName = GetEntitySetName(DbContexType, EntityType.ClrType);
}
public Type ModelType
{
get
{
return EntityType.ClrType;
}
}
public IEntityType EntityType { get; private set; }
public Type DbContexType { get; private set; }
public string EntitySetName { get; private set; }
public IPropertyMetadata[] Properties
{
get
{
if (_properties == null)
{
_properties = GetSortedProperties(EntityType);
}
return _properties;
}
}
/// <summary>
/// Sort properties according to reflection order.
/// </summary>
/// <param name="entityType"></param>
/// <returns></returns>
private IPropertyMetadata[] GetSortedProperties(IEntityType entityType)
{
if(entityType == null)
{
throw new ArgumentNullException(nameof(entityType));
}
var properties = new Dictionary<string, IPropertyMetadata>();
var entityProperties = entityType.GetProperties()
.Where(p => !p.IsShadowProperty)
.Select(p => p.ToPropertyMetadata(DbContexType));
foreach(var p in entityProperties)
{
properties.Add(p.PropertyName, p);
}
var reflectedProperties = entityType.ClrType.GetProperties();
var sortedProperties = new IPropertyMetadata[entityProperties.Count()];
int i = 0;
foreach(var r in reflectedProperties)
{
if(properties.ContainsKey(r.Name))
{
sortedProperties[i++] = properties[r.Name];
}
}
return sortedProperties;
}
public IPropertyMetadata[] PrimaryKeys
{
get
{
if (_primaryKeys == null)
{
var primaryKey = EntityType.FindPrimaryKey();
if (primaryKey == null)
{
throw new InvalidOperationException(MessageStrings.PrimaryKeyNotFound);
}
_primaryKeys = primaryKey
.Properties
.Select(p => p.ToPropertyMetadata(DbContexType))
.ToArray();
}
return _primaryKeys;
}
}
/// <summary>
/// Only navigations that are dependent and has all properties defined
/// in code (non-shadow properties) are returned as part of this.
/// Typically this is used to create code for drop down lists
/// to choose values from principal entity.
/// </summary>
public INavigationMetadata[] Navigations
{
get
{
if (_navigations == null)
{
_navigations = EntityType.GetNavigations()
.Where(n => n.IsDependentToPrincipal() == true && n.ForeignKey.Properties.All(p => !p.IsShadowProperty))
.Select(n => new NavigationMetadata(n, DbContexType))
.ToArray();
}
return _navigations;
}
}
internal static string GetEntitySetName(Type dbContextType, Type modelType)
{
if (dbContextType == null)
{
throw new ArgumentNullException(nameof(dbContextType));
}
if (modelType == null)
{
throw new ArgumentNullException(nameof(modelType));
}
Type dbSetType = typeof(DbSet<>).MakeGenericType(modelType);
var prop = dbContextType.GetRuntimeProperties()
.Where(pi => pi.PropertyType == dbSetType)
.FirstOrDefault();
if (prop != null)
{
return prop.Name;
}
else
{
//Fallback to this or throw?
return "Set<" + modelType.Name + ">()";
}
}
}
}