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FilterConvention.cs
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FilterConvention.cs
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using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Reflection;
using HotChocolate.Configuration;
using HotChocolate.Internal;
using HotChocolate.Resolvers;
using HotChocolate.Types;
using HotChocolate.Types.Descriptors;
using HotChocolate.Utilities;
using static HotChocolate.Data.DataResources;
using static HotChocolate.Data.ThrowHelper;
namespace HotChocolate.Data.Filters
{
/// <summary>
/// The filter convention provides defaults for inferring filters.
/// </summary>
public class FilterConvention
: Convention<FilterConventionDefinition>
, IFilterConvention
{
private const string _typePostFix = "FilterInput";
private Action<IFilterConventionDescriptor>? _configure;
private INamingConventions _namingConventions = default!;
private IReadOnlyDictionary<int, FilterOperation> _operations = default!;
private IDictionary<Type, Type> _bindings = default!;
private IDictionary<ITypeReference, List<ConfigureFilterInputType>> _configs = default!;
private NameString _argumentName;
private IFilterProvider _provider = default!;
private ITypeInspector _typeInspector = default!;
protected FilterConvention()
{
_configure = Configure;
}
public FilterConvention(Action<IFilterConventionDescriptor> configure)
{
_configure = configure ??
throw new ArgumentNullException(nameof(configure));
}
internal new FilterConventionDefinition? Definition => base.Definition;
protected override FilterConventionDefinition CreateDefinition(
IConventionContext context)
{
if (_configure is null)
{
throw new InvalidOperationException(FilterConvention_NoConfigurationSpecified);
}
var descriptor = FilterConventionDescriptor.New(
context.DescriptorContext,
context.Scope);
_configure(descriptor);
_configure = null;
return descriptor.CreateDefinition();
}
protected virtual void Configure(IFilterConventionDescriptor descriptor)
{
}
protected override void Complete(IConventionContext context)
{
if (Definition?.Provider is null)
{
throw FilterConvention_NoProviderFound(GetType(), Definition?.Scope);
}
if (Definition.ProviderInstance is null)
{
_provider =
context.Services.GetOrCreateService<IFilterProvider>(Definition.Provider) ??
throw FilterConvention_NoProviderFound(GetType(), Definition.Scope);
}
else
{
_provider = Definition.ProviderInstance;
}
_namingConventions = context.DescriptorContext.Naming;
_operations = Definition.Operations.ToDictionary(
x => x.Id,
FilterOperation.FromDefinition);
_bindings = Definition.Bindings;
_configs = Definition.Configurations;
_argumentName = Definition.ArgumentName;
if (_provider is IFilterProviderConvention init)
{
IReadOnlyList<IFilterProviderExtension> extensions =
CollectExtensions(context.Services, Definition);
init.Initialize(context, this);
MergeExtensions(context, init, extensions);
init.Complete(context);
}
_typeInspector = context.DescriptorContext.TypeInspector;
// It is important to always call base to continue the cleanup and the disposal of the
// definition
base.Complete(context);
}
/// <inheritdoc />
public virtual NameString GetTypeName(Type runtimeType)
{
if (runtimeType is null)
{
throw new ArgumentNullException(nameof(runtimeType));
}
string name = _namingConventions.GetTypeName(runtimeType);
if (!name.EndsWith(_typePostFix, StringComparison.Ordinal))
{
name += _typePostFix;
}
return name;
}
/// <inheritdoc />
public virtual string? GetTypeDescription(Type runtimeType) =>
_namingConventions.GetTypeDescription(runtimeType, TypeKind.InputObject);
/// <inheritdoc />
public virtual NameString GetFieldName(MemberInfo member) =>
_namingConventions.GetMemberName(member, MemberKind.InputObjectField);
/// <inheritdoc />
public virtual string? GetFieldDescription(MemberInfo member) =>
_namingConventions.GetMemberDescription(member, MemberKind.InputObjectField);
/// <inheritdoc />
public virtual ExtendedTypeReference GetFieldType(MemberInfo member)
{
if (member is null)
{
throw new ArgumentNullException(nameof(member));
}
if (TryCreateFilterType(_typeInspector.GetReturnType(member, true), out Type? rt))
{
return _typeInspector.GetTypeRef(rt, TypeContext.Input, Scope);
}
throw FilterConvention_TypeOfMemberIsUnknown(member);
}
/// <inheritdoc />
public NameString GetOperationName(int operation)
{
if (_operations.TryGetValue(operation, out FilterOperation? operationConvention))
{
return operationConvention.Name;
}
throw FilterConvention_OperationNameNotFound(operation);
}
/// <inheritdoc />
public string? GetOperationDescription(int operationId)
{
if (_operations.TryGetValue(operationId, out FilterOperation? operationConvention))
{
return operationConvention.Description;
}
return null;
}
/// <inheritdoc />
public NameString GetArgumentName() => _argumentName;
/// <inheritdoc cref="IFilterConvention"/>
public void ApplyConfigurations(
ITypeReference typeReference,
IFilterInputTypeDescriptor descriptor)
{
if (_configs.TryGetValue(
typeReference,
out List<ConfigureFilterInputType>? configurations))
{
foreach (ConfigureFilterInputType configure in configurations)
{
configure(descriptor);
}
if (descriptor is FilterInputTypeDescriptor inputTypeDescriptor)
{
inputTypeDescriptor.CreateDefinition();
}
}
}
public FieldMiddleware CreateExecutor<TEntityType>() =>
_provider.CreateExecutor<TEntityType>(_argumentName);
public virtual void ConfigureField(IObjectFieldDescriptor descriptor) =>
_provider.ConfigureField(_argumentName, descriptor);
public bool TryGetHandler(
ITypeDiscoveryContext context,
IFilterInputTypeDefinition typeDefinition,
IFilterFieldDefinition fieldDefinition,
[NotNullWhen(true)] out IFilterFieldHandler? handler)
{
foreach (IFilterFieldHandler filterFieldHandler in _provider.FieldHandlers)
{
if (filterFieldHandler.CanHandle(context, typeDefinition, fieldDefinition))
{
handler = filterFieldHandler;
return true;
}
}
handler = null;
return false;
}
private bool TryCreateFilterType(
IExtendedType runtimeType,
[NotNullWhen(true)] out Type? type)
{
if (_bindings.TryGetValue(runtimeType.Source, out type))
{
return true;
}
if (runtimeType.IsArrayOrList)
{
if (runtimeType.ElementType is {} &&
TryCreateFilterType(runtimeType.ElementType, out Type? elementType))
{
type = typeof(ListFilterInput<>).MakeGenericType(elementType);
return true;
}
}
if (runtimeType.Type.IsEnum)
{
type = typeof(EnumOperationFilterInput<>).MakeGenericType(runtimeType.Source);
return true;
}
if (runtimeType.Type.IsClass)
{
type = typeof(FilterInputType<>).MakeGenericType(runtimeType.Source);
return true;
}
type = null;
return false;
}
private static IReadOnlyList<IFilterProviderExtension> CollectExtensions(
IServiceProvider serviceProvider,
FilterConventionDefinition definition)
{
List<IFilterProviderExtension> extensions = new List<IFilterProviderExtension>();
extensions.AddRange(definition.ProviderExtensions);
foreach (var extensionType in definition.ProviderExtensionsTypes)
{
if (serviceProvider.TryGetOrCreateService<IFilterProviderExtension>(
extensionType,
out var createdExtension))
{
extensions.Add(createdExtension);
}
}
return extensions;
}
private void MergeExtensions(
IConventionContext context,
IFilterProviderConvention provider,
IReadOnlyList<IFilterProviderExtension> extensions)
{
if (provider is Convention providerConvention)
{
for (var m = 0; m < extensions.Count; m++)
{
if (extensions[m] is IFilterProviderConvention extensionConvention)
{
extensionConvention.Initialize(context, this);
extensions[m].Merge(context, providerConvention);
extensionConvention.Complete(context);
}
}
}
}
}
}