feat(dcl): OPC UA A&C field mapper (Task 11 part 1 — pure, unit-tested)

2026-05-29 16:13:02 -04:00
parent d3b3d15018
commit 1fbb814daa
2 changed files with 110 additions and 0 deletions
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+using ZB.MOM.WW.ScadaBridge.Commons.Types.Alarms;
+using ZB.MOM.WW.ScadaBridge.Commons.Types.Enums;
+
+namespace ZB.MOM.WW.ScadaBridge.DataConnectionLayer.Adapters;
+
+/// <summary>
+/// Pure mapping helpers turning OPC UA Alarms &amp; Conditions event fields into the
+/// protocol-neutral <see cref="AlarmConditionState"/> / transition shape. Kept
+/// free of any OPC UA SDK types so it is unit-testable without a live server;
+/// the SDK field extraction lives in <c>RealOpcUaClient</c> and is exercised by
+/// the live smoke test (Task 28).
+/// </summary>
+public static class OpcUaAlarmMapper
+{
+    /// <summary>Clamps an OPC UA severity (1–1000, sometimes out of range) to the unified 0–1000 scale.</summary>
+    public static int NormalizeSeverity(int severity) => Math.Clamp(severity, 0, 1000);
+
+    /// <summary>Builds an <see cref="AlarmConditionState"/> from the orthogonal A&amp;C sub-states.</summary>
+    public static AlarmConditionState BuildCondition(
+        bool active, bool acked, bool? confirmed, AlarmShelveState shelve, bool suppressed, int severity) =>
+        new(Active: active, Acknowledged: acked, Confirmed: confirmed,
+            Shelve: shelve, Suppressed: suppressed, Severity: NormalizeSeverity(severity));
+
+    /// <summary>
+    /// Derives the transition kind from the change in active/acked sub-states.
+    /// Acknowledgement takes precedence over an active/inactive edge when both
+    /// change in the same event; an unchanged event is reported as a StateChange.
+    /// </summary>
+    public static AlarmTransitionKind DeriveKind(bool prevAcked, bool nowAcked, bool prevActive, bool nowActive)
+    {
+        if (!prevAcked && nowAcked)
+            return AlarmTransitionKind.Acknowledge;
+        if (!prevActive && nowActive)
+            return AlarmTransitionKind.Raise;
+        if (prevActive && !nowActive)
+            return AlarmTransitionKind.Clear;
+        if (prevActive && nowActive)
+            return AlarmTransitionKind.Retrigger;
+        return AlarmTransitionKind.StateChange;
+    }
+
+    /// <summary>Maps the OPC UA ShelvingState current-state node name to the shelve enum.</summary>
+    public static AlarmShelveState MapShelve(string? shelvingStateName) => shelvingStateName switch
+    {
+        "OneShotShelved" => AlarmShelveState.OneShotShelved,
+        "TimedShelved" => AlarmShelveState.TimedShelved,
+        // OPC UA does not expose a distinct "permanent" shelve; treat any other
+        // shelved name as one-shot and "Unshelved"/null as unshelved.
+        null or "Unshelved" => AlarmShelveState.Unshelved,
+        _ => AlarmShelveState.OneShotShelved
+    };
+}