101 lines
3.3 KiB
C#
101 lines
3.3 KiB
C#
using System.Collections.Concurrent;
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using System.Diagnostics.CodeAnalysis;
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using AcDream.Content;
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using AcDream.Content.Pak;
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using DatReaderWriter.DBObjs;
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namespace AcDream.App.Composition;
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/// <summary>
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/// Resolves Setup presentation metadata only when the immutable prepared
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/// catalog proves that the source DID is a Setup. Ordinary GfxObj IDs never
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/// reach the DAT deserializer, so absence is ordinary control flow rather
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/// than an exception.
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/// </summary>
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internal sealed class PreparedSetupResolver
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{
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private readonly IPreparedAssetSource _preparedAssets;
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private readonly Func<uint, Setup?> _loadSetup;
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private readonly Action<string> _diagnostic;
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private readonly ConcurrentDictionary<uint, byte> _diagnosed = new();
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public PreparedSetupResolver(
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IPreparedAssetSource preparedAssets,
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Func<uint, Setup?> loadSetup,
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Action<string> diagnostic)
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{
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_preparedAssets = preparedAssets
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?? throw new ArgumentNullException(nameof(preparedAssets));
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_loadSetup = loadSetup
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?? throw new ArgumentNullException(nameof(loadSetup));
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_diagnostic = diagnostic
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?? throw new ArgumentNullException(nameof(diagnostic));
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}
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public bool TryResolve(
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uint sourceId,
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[NotNullWhen(true)] out Setup? setup)
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{
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PreparedAssetPresence presence =
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_preparedAssets.Probe(PakAssetType.SetupMesh, sourceId);
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if (presence == PreparedAssetPresence.Missing)
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{
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setup = null;
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return false;
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}
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if (presence == PreparedAssetPresence.Corrupt)
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{
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throw new InvalidDataException(
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$"Prepared Setup entry 0x{sourceId:X8} is corrupt; " +
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"activation cannot safely infer presentation metadata.");
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}
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try
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{
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setup = _loadSetup(sourceId);
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if (setup is not null)
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return true;
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DiagnoseOnce(
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sourceId,
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$"Prepared Setup entry 0x{sourceId:X8} exists but its " +
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"matching DAT record could not be loaded; activation skipped.");
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return false;
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}
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catch (InvalidDataException ex)
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{
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return DiagnoseCorruptData(sourceId, ex, out setup);
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}
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catch (EndOfStreamException ex)
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{
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return DiagnoseCorruptData(sourceId, ex, out setup);
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}
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catch (ArgumentOutOfRangeException ex)
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{
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// DatReaderWriter's verified malformed-record failure:
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// QualifiedDataId<T>.Unpack / Setup.Unpack can surface an
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// ArgumentOutOfRangeException for invalid record contents.
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return DiagnoseCorruptData(sourceId, ex, out setup);
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}
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}
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private bool DiagnoseCorruptData(
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uint sourceId,
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Exception exception,
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out Setup? setup)
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{
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setup = null;
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DiagnoseOnce(
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sourceId,
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$"Setup DAT record 0x{sourceId:X8} is malformed " +
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$"({exception.GetType().Name}: {exception.Message}); " +
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"activation skipped.");
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return false;
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}
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private void DiagnoseOnce(uint sourceId, string message)
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{
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if (_diagnosed.TryAdd(sourceId, 0))
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_diagnostic(message);
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}
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}
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