Claunia.Encoding/Claunia.Encoding/EncodingInfo.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System;

namespace Claunia.Encoding
{
    /// <summary>
    ///     Provides basic information about an encoding.
    /// </summary>
    public sealed class EncodingInfo
    {
        bool          isSystem;
        readonly Type thisType;

        internal EncodingInfo(int  codePage, string name, string displayName, bool system = true,
                              Type internalType = null)
        {
            CodePage    = codePage;
            Name        = name;
            DisplayName = displayName;
            isSystem    = system;
            thisType    = internalType;
        }

        /// <summary>
        ///     Gets the code page identifier of the encoding.
        /// </summary>
        /// <value>The code page identifier of the encoding.</value>
        public int CodePage { get; }

        /// <summary>
        ///     Gets the name registered with the Internet Assigned Numbers Authority (IANA) for the encoding.
        /// </summary>
        /// <value>The IANA name for the encoding. For more information about the IANA, see www.iana.org.</value>
        public string Name { get; }

        /// <summary>
        ///     Gets the human-readable description of the encoding.
        /// </summary>
        /// <value>The human-readable description of the encoding.</value>
        public string DisplayName { get; }

        /// <summary>
        ///     Returns a Encoding object that corresponds to the current EncodingInfo object.
        /// </summary>
        /// <returns>
        ///     A <see cref="T:Claunia.Encoding.Encoding" /> object that corresponds to the current
        ///     <see cref="T:Claunia.Encoding.EncodingInfo" /> object.
        /// </returns>
        public Encoding GetEncoding() => (Encoding)thisType.GetConstructor(new Type[] { }).Invoke(new object[] { });

        /// <summary>
        ///     Gets a value indicating whether the specified object is equal to the current EncodingInfo object.
        /// </summary>
        /// <param name="value">An object to compare to the current <see cref="T:Claunia.Encoding.EncodingInfo" /> object.</param>
        /// <returns>
        ///     <c>true</c> if value is a <see cref="T:Claunia.Encoding.EncodingInfo" /> and is equal to the current
        ///     <see cref="T:Claunia.Encoding.EncodingInfo" />; otherwise, <c>false</c>.
        /// </returns>
        public override bool Equals(object value) => value is EncodingInfo that && CodePage == that.CodePage;

        /// <summary>
        ///     Returns the hash code for the current EncodingInfo object.
        /// </summary>
        /// <returns>A 32-bit signed integer hash code.</returns>
        public override int GetHashCode() => CodePage;
    }
}