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EnvelopeGenerator.Application/EmailTemplates/Queries/ReadEmailTemplateQuery.cs

@@ -0,0 +1,55 @@
+using AutoMapper;
+using MediatR;
+using EnvelopeGenerator.Application.Common.Dto;
+using DigitalData.Core.Abstraction.Application.Repository;
+using EnvelopeGenerator.Domain.Entities;
+using Microsoft.EntityFrameworkCore;
+
+namespace EnvelopeGenerator.Application.EmailTemplates.Queries.Read;
+
+/// <summary>
+/// Stellt eine Abfrage dar, um eine E-Mail-Vorlage zu lesen.
+/// Diese Klasse erbt von <see cref="EmailTemplateQuery"/>.
+/// </summary>
+public record ReadEmailTemplateQuery : EmailTemplateQuery, IRequest<EmailTemplateDto?>
+{
+}
+
+/// <summary>
+/// 
+/// </summary>
+public class ReadEmailTemplateQueryHandler : IRequestHandler<ReadEmailTemplateQuery, EmailTemplateDto?>
+{
+    private readonly IMapper _mapper;
+
+    private readonly IRepository<EmailTemplate> _repo;
+
+    /// <summary>
+    /// Initialisiert eine neue Instanz der <see cref="EmailTemplateController"/>-Klasse.
+    /// </summary>
+    /// <param name="mapper">
+    /// <param name="repo">
+    /// Die AutoMapper-Instanz, die zum Zuordnen von Objekten verwendet wird.
+    /// </param>
+    public ReadEmailTemplateQueryHandler(IMapper mapper, IRepository<EmailTemplate> repo)
+    {
+        _mapper = mapper;
+        _repo = repo;
+    }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="request"></param>
+    /// <param name="cancel"></param>
+    /// <returns></returns>
+    /// <exception cref="InvalidOperationException"></exception>
+    public async Task<EmailTemplateDto?> Handle(ReadEmailTemplateQuery request, CancellationToken cancel)
+    {
+        var query = request.Id is int id
+            ? _repo.Query.Where(temp => temp.Id == id)
+            : _repo.Query.Where(temp => temp.Name == request.Type!.ToString());
+
+        return _mapper.Map<EmailTemplateDto>(await query.FirstOrDefaultAsync(cancel));
+    }
+}