// Copyright 2009-2022 Josh Close
// This file is a part of CsvHelper and is dual licensed under MS-PL and Apache 2.0.
// See LICENSE.txt for details or visit http://www.opensource.org/licenses/ms-pl.html for MS-PL and http://opensource.org/licenses/Apache-2.0 for Apache 2.0.
// https://github.com/JoshClose/CsvHelper
using System;

namespace CsvHelper.Configuration.Attributes
{
	/// <summary>
	/// The string values used to represent null when converting.
	/// </summary>
	[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false, Inherited = true)]
	public class NullValuesAttribute : Attribute, IMemberMapper, IParameterMapper
	{
		/// <summary>
		/// Gets the null values.
		/// </summary>
		public string[] NullValues { get; private set; }

		/// <summary>
		/// The string values used to represent null when converting.
		/// </summary>
		/// <param name="nullValue">The null values.</param>
		public NullValuesAttribute(string nullValue)
		{
			NullValues = new string[] { nullValue };
		}

		/// <summary>
		/// The string values used to represent null when converting.
		/// </summary>
		/// <param name="nullValues">The null values.</param>
		public NullValuesAttribute(params string[] nullValues)
		{
			NullValues = nullValues;
		}

		/// <inheritdoc />
		public void ApplyTo(MemberMap memberMap)
		{
			memberMap.Data.TypeConverterOptions.NullValues.Clear();
			memberMap.Data.TypeConverterOptions.NullValues.AddRange(NullValues);
		}

		/// <inheritdoc />
		public void ApplyTo(ParameterMap parameterMap)
		{
			parameterMap.Data.TypeConverterOptions.NullValues.Clear();
			parameterMap.Data.TypeConverterOptions.NullValues.AddRange(NullValues);
		}
	}
}