// This file is part of YamlDotNet - A .NET library for YAML.
// Copyright (c) Antoine Aubry and contributors
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
// of the Software, and to permit persons to whom the Software is furnished to do
// so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

using System;
using System.Collections.Generic;

namespace YamlDotNet.Serialization
{
    /// <summary>
    /// Contains mappings between tags and types.
    /// </summary>
    public sealed class TagMappings
    {
        private readonly IDictionary<string, Type> mappings;

        /// <summary>
        /// Initializes a new instance of the <see cref="TagMappings"/> class.
        /// </summary>
        public TagMappings()
        {
            mappings = new Dictionary<string, Type>();
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="TagMappings"/> class.
        /// </summary>
        /// <param name="mappings">The mappings.</param>
        public TagMappings(IDictionary<string, Type> mappings)
        {
            this.mappings = new Dictionary<string, Type>(mappings);
        }

        /// <summary>
        /// Adds the specified tag.
        /// </summary>
        /// <param name="tag">The tag.</param>
        /// <param name="mapping">The mapping.</param>
        public void Add(string tag, Type mapping)
        {
            mappings.Add(tag, mapping);
        }

        /// <summary>
        /// Gets the mapping.
        /// </summary>
        /// <param name="tag">The tag.</param>
        /// <returns></returns>
        internal Type? GetMapping(string tag)
        {
            return mappings.TryGetValue(tag, out var mapping) ? mapping : null;
        }
    }
}
