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JsonObjectTypeExtensions.cs
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JsonObjectTypeExtensions.cs
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using System;
using System.Globalization;
using System.Text.Json;
using HotChocolate.Resolvers;
using HotChocolate.Types.Descriptors.Definitions;
namespace HotChocolate.Types;
/// <summary>
/// Provides <see cref="IObjectFieldDescriptor"/> extensions to handle JSON objects.
/// </summary>
public static class JsonObjectTypeExtensions
{
/// <summary>
/// Specifies that this field will be resolved from the JsonElement representing the instance
/// of this type.
/// </summary>
/// <param name="descriptor">
/// The <see cref="IObjectFieldDescriptor"/> representing the field configuration.
/// </param>
/// <param name="propertyName">
/// If specified this name will be used as the property name to get the field data from.
/// </param>
/// <returns>
/// Returns the <see cref="IObjectFieldDescriptor"/> for configuration chaining.
/// </returns>
public static IObjectFieldDescriptor FromJson(
this IObjectFieldDescriptor descriptor,
string? propertyName = null)
{
if (descriptor is null)
{
throw new ArgumentNullException(nameof(descriptor));
}
descriptor
.Extend()
.OnBeforeCompletion(
(ctx, def) =>
{
propertyName ??= def.Name;
var type = ctx.GetType<IType>(def.Type!);
var namedType = type.NamedType();
if (type.IsListType())
{
throw ThrowHelper.CannotInferTypeFromJsonObj(ctx.Type.Name);
}
if (namedType is ScalarType scalarType)
{
InferResolver(ctx.Type, def, scalarType, propertyName);
return;
}
throw ThrowHelper.CannotInferTypeFromJsonObj(ctx.Type.Name);
});
return descriptor;
}
/// <summary>
/// Specifies that this field will be resolved from the JsonElement representing the instance
/// of this type.
/// </summary>
/// <param name="descriptor">
/// The <see cref="IObjectFieldDescriptor"/> representing the field configuration.
/// </param>
/// <param name="resolve">
/// A resolver that will be applied to the JsonElement representing the instance of this type.
/// </param>
/// <returns>
/// Returns the <see cref="IObjectFieldDescriptor"/> for configuration chaining.
/// </returns>
public static IObjectFieldDescriptor FromJson<TResult>(
this IObjectFieldDescriptor descriptor,
Func<JsonElement, TResult> resolve)
{
if (descriptor is null)
{
throw new ArgumentNullException(nameof(descriptor));
}
if (resolve is null)
{
throw new ArgumentNullException(nameof(resolve));
}
descriptor
.Extend()
.OnBeforeCreate(
def =>
{
def.ResultType = typeof(TResult);
def.PureResolver = ctx => resolve(ctx.Parent<JsonElement>());
});
return descriptor;
}
internal static void InferResolver(
ITypeSystemObject type,
ObjectFieldDefinition def,
ScalarType scalarType,
string propertyName)
{
switch (scalarType.Name)
{
case ScalarNames.ID:
case ScalarNames.String:
def.PureResolver = ctx => ctx.GetProperty(propertyName)?.GetString();
return;
case ScalarNames.Boolean:
def.PureResolver = ctx =>
{
var property = ctx.GetProperty(propertyName);
return property is null or { ValueKind: JsonValueKind.Null }
? null
: property.Value.GetBoolean();
};
return;
case ScalarNames.Short:
def.PureResolver = ctx =>
{
var property = ctx.GetProperty(propertyName);
return property is null or { ValueKind: JsonValueKind.Null }
? null
: property.Value.GetInt16();
};
return;
case ScalarNames.Int:
def.PureResolver = ctx =>
{
var property = ctx.GetProperty(propertyName);
return property is null or { ValueKind: JsonValueKind.Null }
? null
: property.Value.GetInt32();
};
return;
case ScalarNames.Long:
def.PureResolver = ctx =>
{
var property = ctx.GetProperty(propertyName);
return property is null or { ValueKind: JsonValueKind.Null }
? null
: property.Value.GetUInt64();
};
return;
case ScalarNames.Float:
def.PureResolver = ctx =>
{
var property = ctx.GetProperty(propertyName);
return property is null or { ValueKind: JsonValueKind.Null }
? null
: property.Value.GetDouble();
};
return;
case ScalarNames.Decimal:
def.PureResolver = ctx =>
{
var property = ctx.GetProperty(propertyName);
return property is null or { ValueKind: JsonValueKind.Null }
? null
: property.Value.GetDecimal();
};
return;
case ScalarNames.URL:
def.PureResolver = ctx =>
{
var property = ctx.GetProperty(propertyName);
if (property is null or { ValueKind: JsonValueKind.Null })
{
return null;
}
return new Uri(property.Value.GetString()!);
};
return;
case ScalarNames.UUID:
def.PureResolver = ctx =>
{
var property = ctx.GetProperty(propertyName);
return property is null or { ValueKind: JsonValueKind.Null }
? null
: property.Value.GetGuid();
};
return;
case ScalarNames.Byte:
def.PureResolver = ctx =>
{
var property = ctx.GetProperty(propertyName);
return property is null or { ValueKind: JsonValueKind.Null }
? null
: property.Value.GetByte();
};
return;
case ScalarNames.ByteArray:
def.PureResolver = ctx =>
{
var property = ctx.GetProperty(propertyName);
return property is null or { ValueKind: JsonValueKind.Null }
? null
: property.Value.GetBytesFromBase64();
};
return;
case ScalarNames.Date:
def.PureResolver = ctx =>
{
var property = ctx.GetProperty(propertyName);
if (property is null or { ValueKind: JsonValueKind.Null })
{
return null;
}
return DateTime.Parse(
property.Value.GetString()!,
CultureInfo.InvariantCulture,
DateTimeStyles.AssumeUniversal);
};
return;
case ScalarNames.DateTime:
def.PureResolver = ctx =>
{
var property = ctx.GetProperty(propertyName);
return property is null or { ValueKind: JsonValueKind.Null }
? null
: property.Value.GetDateTimeOffset();
};
return;
default:
throw ThrowHelper.CannotInferTypeFromJsonObj(type.Name);
}
}
private static JsonElement? GetProperty(this IPureResolverContext context, string propertyName)
=> context.Parent<JsonElement>().TryGetProperty(propertyName, out var element)
? element
: null;
}