TekH
bc273c7f4f
- Add MergePdfsCommand.cs (Vertical Slice pattern) - Command: IRequest<byte[]> with PdfStreams + PageRanges properties - Handler: Calls IPdfProcessor.MergePdfsAsync, uses primary constructor - Validator: Validates minimum 2 PDFs, page ranges count matches PDF count - All 3 classes in single file (Command/Handler/Validator merged)
54 lines
1.6 KiB
C#
54 lines
1.6 KiB
C#
using DocumentOperator.Application.Common.Interfaces;
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using FluentValidation;
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using MediatR;
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namespace DocumentOperator.Application.MergePdfs;
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/// <summary>
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/// Command to merge multiple PDF documents into a single PDF.
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/// </summary>
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public record MergePdfsCommand : IRequest<byte[]>
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{
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/// <summary>
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/// PDF streams to merge. Minimum 2 required. Each must be at Position=0.
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/// </summary>
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public required IReadOnlyList<Stream> PdfStreams { get; init; }
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/// <summary>
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/// Optional page ranges per PDF (null = all pages).
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/// Format: "1-3,5" means pages 1, 2, 3, and 5.
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/// If provided, array length must match PdfStreams length.
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/// </summary>
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public IReadOnlyList<string?>? PageRanges { get; init; }
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}
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/// <summary>
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/// Handler for MergePdfsCommand.
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/// Delegates PDF merge operation to infrastructure layer.
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/// </summary>
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public class MergePdfsCommandHandler(IPdfProcessor pdfProcessor)
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: IRequestHandler<MergePdfsCommand, byte[]>
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{
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public async Task<byte[]> Handle(MergePdfsCommand request, CancellationToken cancellationToken)
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{
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return await pdfProcessor.MergePdfsAsync(request.PdfStreams, request.PageRanges);
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}
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}
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/// <summary>
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/// Validator for MergePdfsCommand.
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/// </summary>
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public class MergePdfsCommandValidator : AbstractValidator<MergePdfsCommand>
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{
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public MergePdfsCommandValidator()
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{
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RuleFor(x => x.PdfStreams)
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.NotNull()
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.WithMessage("PDF streams are required");
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RuleFor(x => x.PdfStreams)
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.Must(streams => streams != null && streams.Count >= 2)
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.WithMessage("At least 2 PDF files are required for merging");
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}
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}
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