galaeth-draft/Galaeth.DAL/Infrastructure/FallbackTypeMapper.cs

using System.Reflection;
using Dapper;

namespace Galaeth.DAL.Infrastructure;

/// <summary>
/// Fallback type mapper.
/// </summary>
public class FallbackTypeMapper : SqlMapper.ITypeMap
{
    private readonly IEnumerable<SqlMapper.ITypeMap> _mappers;

    /// <summary>
    /// Initializes a new instance of the <see cref="FallbackTypeMapper"/> class.
    /// </summary>
    /// <param name="mappers">Collection of <see cref="SqlMapper.ITypeMap"/>.</param>
    public FallbackTypeMapper(IEnumerable<SqlMapper.ITypeMap> mappers)
    {
        _mappers = mappers;
    }

    /// <summary>
    /// Find constructor.
    /// </summary>
    /// <param name="names">Collection of names.</param>
    /// <param name="types">Collection of types.</param>
    /// <returns>Instance of <see cref="ConstructorInfo"/>.</returns>
    public ConstructorInfo FindConstructor(string[] names, Type[] types)
    {
        foreach (var mapper in _mappers)
        {
            try
            {
                var result = mapper.FindConstructor(names, types);
                if (result != null)
                {
                    return result;
                }
            }
            catch
            {
                // Do nothing
            }
        }

        return null;
    }

    /// <summary>
    /// Find explicit constructor.
    /// </summary>
    /// <returns>Instance of <see cref="ConstructorInfo"/>.</returns>
    public ConstructorInfo FindExplicitConstructor()
    {
        return null;
    }

    /// <summary>
    /// Get constructor paramter map.
    /// </summary>
    /// <param name="constructor">Instance of <see cref="ConstructorInfo"/>.</param>
    /// <param name="columnName">Column name.</param>
    /// <returns>Instance of <see cref="SqlMapper.IMemberMap"/>.</returns>
    public SqlMapper.IMemberMap GetConstructorParameter(ConstructorInfo constructor, string columnName)
    {
        foreach (var mapper in _mappers)
        {
            try
            {
                var result = mapper.GetConstructorParameter(constructor, columnName);
                if (result != null)
                {
                    return result;
                }
            }
            catch
            {
                // Do nothing.
            }
        }

        return null;
    }

    /// <summary>
    /// Get member.
    /// </summary>
    /// <param name="columnName">Column name.</param>
    /// <returns>Instance of <see cref="SqlMapper.IMemberMap"/>.</returns>
    public SqlMapper.IMemberMap GetMember(string columnName)
    {
        foreach (var mapper in _mappers)
        {
            try
            {
                var result = mapper.GetMember(columnName);
                if (result != null)
                {
                    return result;
                }
            }
            catch
            {
                // Do nothing.
            }
        }

        return null;
    }
}