// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
namespace System.Text.Json.Serialization
{
    /// <summary>
    /// When placed on a type, indicates that the type should be serialized polymorphically.
    /// </summary>
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Interface, AllowMultiple = false, Inherited = false)]
    public sealed class JsonPolymorphicAttribute : JsonAttribute
    {
        /// <summary>
        /// Gets or sets a custom type discriminator property name for the polymorphic type.
        /// Uses the default '$type' property name if left unset.
        /// </summary>
        public string? TypeDiscriminatorPropertyName { get; set; }
 
        /// <summary>
        /// Gets or sets the behavior when serializing an undeclared derived runtime type.
        /// </summary>
        public JsonUnknownDerivedTypeHandling UnknownDerivedTypeHandling { get; set; }
 
        /// <summary>
        /// When set to <see langword="true"/>, instructs the deserializer to ignore any
        /// unrecognized type discriminator id's and reverts to the contract of the base type.
        /// Otherwise, it will fail the deserialization.
        /// </summary>
        public bool IgnoreUnrecognizedTypeDiscriminators { get; set; }
    }
}