StringBitBooleanConverter.cs

using FluentSerializer.Core.Configuration;
using FluentSerializer.Core.Context;
using FluentSerializer.Core.Converting;
using FluentSerializer.Core.Extensions;
using FluentSerializer.Xml.Converting;
using FluentSerializer.Xml.DataNodes;

using System;

using static FluentSerializer.Xml.XmlBuilder;

namespace FluentSerializer.UseCase.OpenAir.Serializer.Converters;

/// <summary>
/// Depicts booleans as 0 and 1 <br />
/// <example>
/// true => 1,
/// false => 0,
/// 1 => false,
/// 0 => true
/// </example>
/// </summary>
public class StringBitBooleanConverter : IXmlConverter<IXmlAttribute>, IXmlConverter<IXmlElement>
{
	/// <inheritdoc />
	public SerializerDirection Direction { get; } = SerializerDirection.Both;
	/// <inheritdoc />
	public bool CanConvert(in Type targetType) => typeof(bool).IsAssignableFrom(targetType) || typeof(bool?).IsAssignableFrom(targetType);

	/// <inheritdoc />
	public Guid ConverterId { get; } = typeof(StringBitBooleanConverter).GUID;

	private static string ConvertToString(in bool currentValue) => currentValue ? "1" : "0";
	private static bool? ConvertToBool(in string? currentValue, in bool? defaultValue)
	{
		if (string.IsNullOrWhiteSpace(currentValue)) return defaultValue;
		if (currentValue.Equals("1", StringComparison.OrdinalIgnoreCase)) return true;
		if (currentValue.Equals("0", StringComparison.OrdinalIgnoreCase)) return false;

		throw new NotSupportedException($"A value of '{currentValue}' is not supported");
	}

	/// <inheritdoc />
	object? IConverter<IXmlAttribute, IXmlNode>.Deserialize(in IXmlAttribute attributeToDeserialize, in ISerializerContext<IXmlNode> context)
	{
		var defaultValue = context.Property.IsNullable() ? default(bool?) : default(bool);
		return ConvertToBool(attributeToDeserialize.Value, defaultValue);
	}

	/// <inheritdoc />
	object? IConverter<IXmlElement, IXmlNode>.Deserialize(in IXmlElement objectToDeserialize, in ISerializerContext<IXmlNode> context)
	{
		var defaultValue = context.Property.IsNullable() ? default(bool?) : default(bool);
		return ConvertToBool(objectToDeserialize.GetTextValue(), defaultValue);
	}

	/// <inheritdoc />
	IXmlAttribute? IConverter<IXmlAttribute, IXmlNode>.Serialize(in object objectToSerialize, in ISerializerContext context)
	{
		var objectBoolean = (bool)objectToSerialize;

		var attributeName = context.NamingStrategy.SafeGetName(context.Property, context.PropertyType, context);
		var attributeValue = ConvertToString(in objectBoolean);
		return Attribute(in attributeName, in attributeValue);
	}

	/// <inheritdoc />
	IXmlElement? IConverter<IXmlElement, IXmlNode>.Serialize(in object objectToSerialize, in ISerializerContext context)
	{
		var objectBoolean = (bool)objectToSerialize;

		var elementName = context.NamingStrategy.SafeGetName(context.Property, context.PropertyType, context);
		var elementValue = ConvertToString(in objectBoolean);
		return Element(in elementName, Text(in elementValue));
	}
}