49 lines
1.9 KiB
C#
49 lines
1.9 KiB
C#
using System;
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using System.Threading.Tasks;
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using Microsoft.Extensions.Logging;
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namespace MaddoShared;
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/// <summary>
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/// Dynamically resolves the concrete IImageCreator implementation at call time
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/// based on current PicSettings.ImageCreatorProvider.
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/// </summary>
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public class ImageCreatorMapper : IImageCreator
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{
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private readonly IServiceProvider _sp;
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private readonly PicSettings _settings;
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private readonly ILogger<ImageCreatorMapper> _logger;
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public ImageCreatorMapper(IServiceProvider sp, PicSettings settings, ILogger<ImageCreatorMapper> logger)
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{
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_sp = sp ?? throw new ArgumentNullException(nameof(sp));
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_settings = settings ?? throw new ArgumentNullException(nameof(settings));
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_logger = logger;
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}
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public Task CreateImageAsync(ImageState imgState, System.Drawing.Image logo)
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{
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var provider = (_settings.ImageCreatorProvider ?? "Sharp").Trim();
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_logger?.LogDebug("Resolving IImageCreator for provider '{Provider}'", provider);
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return provider.Equals("ALTERNATE", StringComparison.OrdinalIgnoreCase)
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? ResolveAndCall<ImageCreatorImageSharp>(imgState, logo)
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: ResolveAndCall<ImageCreatorGDI>(imgState, logo);
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}
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private Task ResolveAndCall<T>(ImageState imgState, System.Drawing.Image logo) where T : IImageCreator
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{
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// Resolve the concrete implementation and forward the call
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var impl = (IImageCreator)_sp.GetService(typeof(T));
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if (impl is null)
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{
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_logger?.LogWarning("Requested image creator {Type} is not registered. Falling back to ImageCreatorGDI.", typeof(T).Name);
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impl = (IImageCreator)_sp.GetService(typeof(ImageCreatorGDI));
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}
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if (impl is null)
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throw new InvalidOperationException("No IImageCreator implementation is registered.");
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return impl.CreateImageAsync(imgState, logo);
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}
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}
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