bepin/BepInEx/ConfigWrapper.cs

using System;
using System.ComponentModel;
using BepInEx.Logging;

namespace BepInEx
{
	public interface IConfigConverter<T>
	{
		string ConvertToString(T value);
		T ConvertFromString(string str);
	}

	public class ConfigWrapper<T>
	{
		private readonly Func<string, T> _strToObj;
		private readonly Func<T, string> _objToStr;
		private readonly string _defaultStr;
		private readonly T _default;
		private T _lastValue;
		private bool _lastValueSet;

		public string Key { get; protected set; }

		public string Section { get; protected set; }

		public T Value
		{
			get { return GetValue(); }
			set { SetValue(value); }
		}

		public ConfigWrapper(string key, T @default = default(T))
		{
			var cvt = TypeDescriptor.GetConverter(typeof(T));

			if (!cvt.CanConvertFrom(typeof(string)))
				throw new ArgumentException("Default TypeConverter can't convert from String");

			if (!cvt.CanConvertTo(typeof(string)))
				throw new ArgumentException("Default TypeConverter can't convert to String");

			_strToObj = (str) => (T)cvt.ConvertFromInvariantString(str);
			_objToStr = (obj) => cvt.ConvertToInvariantString(obj);

			_defaultStr = _objToStr(@default);
			_default = @default;
			Key = key;
		}

		public ConfigWrapper(string key, Func<string, T> strToObj, Func<T, string> objToStr, T @default = default(T))
		{
			if (objToStr == null)
				throw new ArgumentNullException("objToStr");

			if (strToObj == null)
				throw new ArgumentNullException("strToObj");

			_strToObj = strToObj;
			_objToStr = objToStr;

			_defaultStr = _objToStr(@default);
			Key = key;
		}

		public ConfigWrapper(string key, IConfigConverter<T> converter, T @default = default(T))
			: this(key, converter.ConvertFromString, converter.ConvertToString, @default) { }


		public ConfigWrapper(string key, BaseUnityPlugin plugin, T @default = default(T))
			: this(key, @default)
		{
			Section = MetadataHelper.GetMetadata(plugin).GUID;
		}

		public ConfigWrapper(string key, BaseUnityPlugin plugin, Func<string, T> strToObj, Func<T, string> objToStr, T @default = default(T))
			: this(key, strToObj, objToStr, @default)
		{
			Section = MetadataHelper.GetMetadata(plugin).GUID;
		}

		public ConfigWrapper(string key, BaseUnityPlugin plugin, IConfigConverter<T> converter, T @default = default(T))
			: this(key, converter.ConvertFromString, converter.ConvertToString, @default)
		{
			Section = MetadataHelper.GetMetadata(plugin).GUID;
		}

		public ConfigWrapper(string key, string section, T @default = default(T))
			: this(key, @default)
		{
			Section = section;
		}

		public ConfigWrapper(string key, string section, Func<string, T> strToObj, Func<T, string> objToStr, T @default = default(T))
			: this(key, strToObj, objToStr, @default)
		{
			Section = section;
		}

		public ConfigWrapper(string key, string section, IConfigConverter<T> converter, T @default = default(T))
			: this(key, converter.ConvertFromString, converter.ConvertToString, @default)
		{
			Section = section;
		}

		protected virtual bool GetKeyExists()
		{
			return Config.HasEntry(Key, Section);
		}

		protected virtual T GetValue()
		{
			try
			{
				var strVal = Config.GetEntry(Key, _defaultStr, Section);
				var obj = _strToObj(strVal);

				// Always update in case config was changed from outside
				_lastValue = obj;
				_lastValueSet = true;

				return obj;
			}
			catch (Exception ex)
			{
				Logger.Log(LogLevel.Error, "ConfigWrapper Get Converter Exception: " + ex.Message);
				return _default;
			}
		}

		protected virtual void SetValue(T value)
		{
			try
			{
				// Always write just in case config was changed from outside
				var strVal = _objToStr(value);
				Config.SetEntry(Key, strVal, Section);

				if (_lastValueSet && Equals(_lastValue, value))
					return;

				_lastValue = value;
				_lastValueSet = true;

				OnSettingChanged();
			}
			catch (Exception ex)
			{
				Logger.Log(LogLevel.Error, "ConfigWrapper Set Converter Exception: " + ex.Message);
			}
		}

		public void Clear()
		{
			Config.UnsetEntry(Key, Section);

			_lastValueSet = false;
			OnSettingChanged();
		}

		/// <summary>
		/// Fired when the setting is changed. Does not detect changes made outside from this object.
		/// </summary>
		public event EventHandler SettingChanged;

		private void OnSettingChanged()
		{
			SettingChanged?.Invoke(this, EventArgs.Empty);
		}
	}
}