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Add auto input object graph type and builder extensions
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,158 @@ | ||
| using System; | ||
| using System.Collections; | ||
| using System.Collections.Generic; | ||
| using System.ComponentModel; | ||
| using System.Linq; | ||
| using System.Reflection; | ||
| using System.Text; | ||
| using GraphQL.Types; | ||
|
|
||
| namespace GraphQL.DI | ||
| { | ||
| /// <summary> | ||
| /// An automatically-generated graph type for public properties on the specified input model. | ||
| /// </summary> | ||
| public class AutoInputObjectGraphType<TSourceType> : InputObjectGraphType<TSourceType> | ||
| { | ||
| private const string ORIGINAL_EXPRESSION_PROPERTY_NAME = nameof(ORIGINAL_EXPRESSION_PROPERTY_NAME); | ||
|
|
||
| /// <summary> | ||
| /// Creates a GraphQL type from <typeparamref name="TSourceType"/>. | ||
| /// </summary> | ||
| public AutoInputObjectGraphType() | ||
| { | ||
| foreach (var property in GetRegisteredProperties()) { | ||
| var fieldType = ProcessProperty(property); | ||
| if (fieldType != null) | ||
| AddField(fieldType); | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Returns a list of properties that should have fields created for them. | ||
| /// </summary> | ||
| protected virtual IEnumerable<PropertyInfo> GetRegisteredProperties() | ||
| => typeof(TSourceType).GetProperties(BindingFlags.Public | BindingFlags.Instance); | ||
|
|
||
| /// <summary> | ||
| /// Processes the specified property and returns a <see cref="FieldType"/> | ||
| /// </summary> | ||
| /// <param name="property"></param> | ||
| /// <returns></returns> | ||
| protected virtual FieldType? ProcessProperty(PropertyInfo property) | ||
| { | ||
| //get the field name | ||
| string fieldName = property.Name; | ||
| var fieldNameAttribute = property.GetCustomAttribute<NameAttribute>(); | ||
| if (fieldNameAttribute != null) { | ||
| fieldName = fieldNameAttribute.Name; | ||
| } | ||
| if (fieldName == null) | ||
| return null; //ignore field if set to null | ||
|
|
||
| //determine the graphtype of the field | ||
| var graphTypeAttribute = property.GetCustomAttribute<GraphTypeAttribute>(); | ||
| Type? graphType = graphTypeAttribute?.Type; | ||
| //infer the graphtype if it is not specified | ||
| if (graphType == null) { | ||
| graphType = InferGraphType(ApplyAttributes(GetTypeInformation(property))); | ||
| } | ||
| //load the description | ||
| string? description = property.GetCustomAttribute<DescriptionAttribute>()?.Description; | ||
| //load the deprecation reason | ||
| string? obsoleteDescription = property.GetCustomAttribute<ObsoleteAttribute>()?.Message; | ||
| //load the default value | ||
| object? defaultValue = property.GetCustomAttribute<DefaultValueAttribute>()?.Value; | ||
| //create the field | ||
| var fieldType = new FieldType() { | ||
| Type = graphType, | ||
| Name = fieldName, | ||
| Description = description, | ||
| DeprecationReason = obsoleteDescription, | ||
| DefaultValue = defaultValue, | ||
| }; | ||
| //set name of property | ||
| fieldType.WithMetadata(ORIGINAL_EXPRESSION_PROPERTY_NAME, property.Name); | ||
| //load the metadata | ||
| foreach (var metaAttribute in property.GetCustomAttributes<MetadataAttribute>()) | ||
| fieldType.WithMetadata(metaAttribute.Key, metaAttribute.Value); | ||
| //return the field | ||
| return fieldType; | ||
| } | ||
|
|
||
| /// <inheritdoc cref="ReflectionExtensions.GetNullabilityInformation(ParameterInfo)"/> | ||
| protected virtual IEnumerable<(Type Type, Nullability Nullable)> GetNullabilityInformation(PropertyInfo parameter) | ||
| { | ||
| return parameter.GetNullabilityInformation(); | ||
| } | ||
|
|
||
| private static readonly Type[] _listTypes = new Type[] { | ||
| typeof(IEnumerable<>), | ||
| typeof(IList<>), | ||
| typeof(List<>), | ||
| typeof(ICollection<>), | ||
| typeof(IReadOnlyCollection<>), | ||
| typeof(IReadOnlyList<>), | ||
| typeof(HashSet<>), | ||
| typeof(ISet<>), | ||
| }; | ||
|
|
||
| /// <summary> | ||
| /// Analyzes a property and returns a <see cref="TypeInformation"/> | ||
| /// struct containing type information necessary to select a graph type. | ||
| /// </summary> | ||
| protected virtual TypeInformation GetTypeInformation(PropertyInfo propertyInfo) | ||
| { | ||
| var isList = false; | ||
| var isNullableList = false; | ||
| var typeTree = GetNullabilityInformation(propertyInfo); | ||
| foreach (var type in typeTree) { | ||
| if (type.Type.IsArray) { | ||
| //unwrap type and mark as list | ||
| isList = true; | ||
| isNullableList = type.Nullable != Nullability.NonNullable; | ||
| continue; | ||
| } | ||
| if (type.Type.IsGenericType) { | ||
| var g = type.Type.GetGenericTypeDefinition(); | ||
| if (_listTypes.Contains(g)) { | ||
| //unwrap type and mark as list | ||
| isList = true; | ||
| isNullableList = type.Nullable != Nullability.NonNullable; | ||
| continue; | ||
| } | ||
| } | ||
| if (type.Type == typeof(IEnumerable) || type.Type == typeof(ICollection)) { | ||
| //assume list of nullable object | ||
| isList = true; | ||
| isNullableList = type.Nullable != Nullability.NonNullable; | ||
| break; | ||
| } | ||
| //found match | ||
| var nullable = type.Nullable != Nullability.NonNullable; | ||
| return new TypeInformation(propertyInfo, true, type.Type, nullable, isList, isNullableList, null); | ||
| } | ||
| //unknown type | ||
| if (isList) | ||
| isNullableList = true; | ||
| return new TypeInformation(propertyInfo, true, typeof(object), true, isList, isNullableList, null); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Apply <see cref="RequiredAttribute"/>, <see cref="OptionalAttribute"/>, <see cref="RequiredListAttribute"/>, | ||
| /// <see cref="OptionalListAttribute"/>, <see cref="IdAttribute"/> and <see cref="DIGraphAttribute"/> over | ||
| /// the supplied <see cref="TypeInformation"/>. | ||
| /// Override this method to enforce specific graph types for specific CLR types, or to implement custom | ||
| /// attributes to change graph type selection behavior. | ||
| /// </summary> | ||
| protected virtual TypeInformation ApplyAttributes(TypeInformation typeInformation) | ||
| => typeInformation.ApplyAttributes(typeInformation.MemberInfo); | ||
|
|
||
| /// <summary> | ||
| /// Returns a GraphQL input type for a specified CLR type | ||
| /// </summary> | ||
| protected virtual Type InferGraphType(TypeInformation typeInformation) | ||
| => typeInformation.InferGraphType(); | ||
|
|
||
| } | ||
| } |
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