Joseph Doherty
52 lines
2.1 KiB
C#
52 lines
2.1 KiB
C#
using ZB.MOM.WW.ScadaBridge.Commons.Types;
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using ZB.MOM.WW.ScadaBridge.Commons.Types.Enums;
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namespace ZB.MOM.WW.ScadaBridge.Transport.Serialization;
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/// <summary>
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/// Import-time normalization of attribute values to the native-typed JSON form.
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/// <para>
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/// Bundles exported before the native-typed-JSON change carry List attribute
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/// values in the old quoted-element form (e.g. <c>["10","20"]</c> for an
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/// <see cref="DataType.Int32"/> list). Already-exported bundle files can't be
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/// rewritten, so List values are normalised on import: every DTO→entity write
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/// site routes the value through <see cref="NormalizeListValue"/> so imported
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/// data lands native (<c>[10,20]</c>). The central DB normalizer remains the
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/// backstop for anything that slips through.
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/// </para>
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/// <para>
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/// Non-List attributes and null/empty values pass through unchanged. A value
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/// that fails to decode (malformed JSON / un-parseable element) is left exactly
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/// as-is so the import still succeeds — the DB normalizer is the backstop.
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/// </para>
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/// </summary>
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internal static class ImportValueNormalizer
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{
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/// <summary>
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/// Returns the native-typed JSON form of a List attribute value, or the
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/// value unchanged for non-List / null / empty / malformed inputs.
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/// </summary>
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/// <param name="value">The attribute value as carried by the bundle DTO.</param>
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/// <param name="dataType">The attribute's declared data type.</param>
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/// <param name="elementType">The List element type (null for scalars).</param>
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public static string? NormalizeListValue(string? value, DataType dataType, DataType? elementType)
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{
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if (dataType != DataType.List || string.IsNullOrEmpty(value))
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{
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return value;
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}
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try
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{
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return AttributeValueCodec.Encode(
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AttributeValueCodec.Decode(value, DataType.List, elementType));
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}
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catch (FormatException)
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{
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// Leave malformed values exactly as imported; the DB normalizer is
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// the backstop. Never abort the import for a single bad value.
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return value;
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}
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}
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}
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