Joseph Doherty
44 lines
1.9 KiB
C#
44 lines
1.9 KiB
C#
using ZB.MOM.WW.MxGateway.Server.Galaxy;
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namespace ZB.MOM.WW.MxGateway.Server.Sessions;
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/// <summary>
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/// Rewrites a bare MXAccess attribute address to its writable array form by appending the
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/// trailing <c>[]</c> suffix when Galaxy Repository metadata reports the attribute as an array.
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/// MXAccess requires the <c>[]</c> suffix on the AddItem address for an array attribute to be
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/// writable; the bare name registers a read-only-ish handle. This is best-effort: when metadata
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/// is cold, the address is unknown, or the attribute is not an array, the address is returned
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/// unchanged and no exception is thrown.
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/// </summary>
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public sealed class ArrayAddressNormalizer(IGalaxyHierarchyCache cache)
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{
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private const string ArraySuffix = "[]";
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/// <summary>
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/// Returns <paramref name="address"/> with a trailing <c>[]</c> appended when Galaxy metadata
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/// reports it as an array attribute; otherwise returns it unchanged. Never throws.
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/// </summary>
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/// <param name="address">The MXAccess attribute address to normalize.</param>
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/// <returns>The normalized address, or the original address when no rewrite applies.</returns>
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public string Normalize(string address)
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{
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if (string.IsNullOrWhiteSpace(address))
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{
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return address;
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}
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if (address.EndsWith(ArraySuffix, StringComparison.Ordinal))
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{
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return address;
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}
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// Galaxy SQL keys array attributes by their suffixed FullTagReference (e.g. "Obj.Arr[]"),
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// so probe for the suffixed form to decide whether the bare name is an array.
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string suffixed = address + ArraySuffix;
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return cache.Current.Index.TagsByAddress.TryGetValue(suffixed, out GalaxyTagLookup? lookup)
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&& lookup.Attribute?.IsArray == true
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? suffixed
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: address;
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}
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}
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