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/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation. All rights reserved.
*
* This software is subject to the Microsoft Public License (Ms-PL).
* A copy of the license can be found in the license.htm file included
* in this distribution.
*
* You must not remove this notice, or any other, from this software.
*
* ***************************************************************************/
namespace System.Web.Mvc {
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Globalization;
using System.Linq;
using System.Reflection;
using System.Threading;
using System.Web.Mvc.Resources;
public delegate ModelValidator DataAnnotationsModelValidationFactory(ModelMetadata metadata, ControllerContext context, ValidationAttribute attribute);
public class DataAnnotationsModelValidatorProvider : AssociatedValidatorProvider {
private static bool _addImplicitRequiredAttributeForValueTypes = true;
private static ReaderWriterLockSlim _adaptersLock = new ReaderWriterLockSlim();
internal static DataAnnotationsModelValidationFactory DefaultAttributeFactory = DataAnnotationsModelValidator.Create;
internal static Dictionary<Type, DataAnnotationsModelValidationFactory> AttributeFactories = new Dictionary<Type, DataAnnotationsModelValidationFactory>() {
{
typeof(RangeAttribute),
(metadata, context, attribute) => new RangeAttributeAdapter(metadata, context, (RangeAttribute)attribute)
},
{
typeof(RegularExpressionAttribute),
(metadata, context, attribute) => new RegularExpressionAttributeAdapter(metadata, context, (RegularExpressionAttribute)attribute)
},
{
typeof(RequiredAttribute),
(metadata, context, attribute) => new RequiredAttributeAdapter(metadata, context, (RequiredAttribute)attribute)
},
{
typeof(StringLengthAttribute),
(metadata, context, attribute) => new StringLengthAttributeAdapter(metadata, context, (StringLengthAttribute)attribute)
},
};
public static bool AddImplicitRequiredAttributeForValueTypes {
get {
return _addImplicitRequiredAttributeForValueTypes;
}
set {
_addImplicitRequiredAttributeForValueTypes = value;
}
}
protected override IEnumerable<ModelValidator> GetValidators(ModelMetadata metadata, ControllerContext context, IEnumerable<Attribute> attributes) {
_adaptersLock.EnterReadLock();
try {
List<ModelValidator> results = new List<ModelValidator>();
if (AddImplicitRequiredAttributeForValueTypes &&
metadata.IsRequired &&
!attributes.Any(a => a is RequiredAttribute)) {
attributes = attributes.Concat(new[] { new RequiredAttribute() });
}
foreach (ValidationAttribute attribute in attributes.OfType<ValidationAttribute>()) {
DataAnnotationsModelValidationFactory factory;
if (!AttributeFactories.TryGetValue(attribute.GetType(), out factory)) {
factory = DefaultAttributeFactory;
}
results.Add(factory(metadata, context, attribute));
}
return results;
}
finally {
_adaptersLock.ExitReadLock();
}
}
public static void RegisterAdapter(Type attributeType, Type adapterType) {
ValidateAttributeType(attributeType);
ValidateAdapterType(adapterType);
ConstructorInfo constructor = GetAdapterConstructor(attributeType, adapterType);
_adaptersLock.EnterWriteLock();
try {
AttributeFactories[attributeType] = (metadata, context, attribute) => (ModelValidator)constructor.Invoke(new object[] { metadata, context, attribute });
}
finally {
_adaptersLock.ExitWriteLock();
}
}
public static void RegisterAdapterFactory(Type attributeType, DataAnnotationsModelValidationFactory factory) {
ValidateAttributeType(attributeType);
ValidateFactory(factory);
_adaptersLock.EnterWriteLock();
try {
AttributeFactories[attributeType] = factory;
}
finally {
_adaptersLock.ExitWriteLock();
}
}
public static void RegisterDefaultAdapter(Type adapterType) {
ValidateAdapterType(adapterType);
ConstructorInfo constructor = GetAdapterConstructor(typeof(ValidationAttribute), adapterType);
DefaultAttributeFactory = (metadata, context, attribute) => (ModelValidator)constructor.Invoke(new object[] { metadata, context, attribute });
}
public static void RegisterDefaultAdapterFactory(DataAnnotationsModelValidationFactory factory) {
ValidateFactory(factory);
DefaultAttributeFactory = factory;
}
// Helpers
private static ConstructorInfo GetAdapterConstructor(Type attributeType, Type adapterType) {
ConstructorInfo constructor = adapterType.GetConstructor(new[] { typeof(ModelMetadata), typeof(ControllerContext), attributeType });
if (constructor == null) {
throw new ArgumentException(
String.Format(
CultureInfo.CurrentCulture,
MvcResources.DataAnnotationsModelValidatorProvider_ConstructorRequirements,
adapterType.FullName,
typeof(ModelMetadata).FullName,
typeof(ControllerContext).FullName,
attributeType.FullName
),
"adapterType"
);
}
return constructor;
}
private static void ValidateAdapterType(Type adapterType) {
if (adapterType == null) {
throw new ArgumentNullException("adapterType");
}
if (!typeof(ModelValidator).IsAssignableFrom(adapterType)) {
throw new ArgumentException(
String.Format(
CultureInfo.CurrentCulture,
MvcResources.Common_TypeMustDriveFromType,
adapterType.FullName,
typeof(ModelValidator).FullName
),
"adapterType"
);
}
}
private static void ValidateAttributeType(Type attributeType) {
if (attributeType == null) {
throw new ArgumentNullException("attributeType");
}
if (!typeof(ValidationAttribute).IsAssignableFrom(attributeType)) {
throw new ArgumentException(
String.Format(
CultureInfo.CurrentCulture,
MvcResources.Common_TypeMustDriveFromType,
attributeType.FullName,
typeof(ValidationAttribute).FullName
),
"attributeType");
}
}
private static void ValidateFactory(DataAnnotationsModelValidationFactory factory) {
if (factory == null) {
throw new ArgumentNullException("factory");
}
}
}
}
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