add a random severity

example/eventGenerator/EventLimitProvider.js

@@ -0,0 +1,88 @@
+/*****************************************************************************
+ * Open MCT, Copyright (c) 2014-2024, United States Government
+ * as represented by the Administrator of the National Aeronautics and Space
+ * Administration. All rights reserved.
+ *
+ * Open MCT is licensed under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * Open MCT includes source code licensed under additional open source
+ * licenses. See the Open Source Licenses file (LICENSES.md) included with
+ * this source code distribution or the Licensing information page available
+ * at runtime from the About dialog for additional information.
+ *****************************************************************************/
+
+export const SEVERITY_CSS = {
+  WATCH: 'is-event--yellow',
+  WARNING: 'is-event--yellow',
+  DISTRESS: 'is-event--red',
+  CRITICAL: 'is-event--red',
+  SEVERE: 'is-event--red'
+};
+
+const NOMINAL_SEVERITY = {
+  cssClass: 'is-event--no-style',
+  name: 'NOMINAL'
+};
+
+/**
+ * @typedef {Object} EvaluationResult
+ * @property {string} cssClass CSS class information
+ * @property {string} name a severity name
+ */
+export default class EventLimitProvider {
+  constructor(openmct) {
+    this.openmct = openmct;
+  }
+
+  getLimitEvaluator(domainObject) {
+    const self = this;
+
+    return {
+      /**
+       * Evaluates a telemetry datum for severity.
+       *
+       * @param {Datum} datum the telemetry datum from the historical or realtime plugin ({@link Datum})
+       * @param {object} valueMetadata metadata about the telemetry datum
+       *
+       * @returns {EvaluationResult} ({@link EvaluationResult})
+       */
+      evaluate: function (datum, valueMetadata) {
+        // prevent applying the class to the tr, only to td
+        if (!valueMetadata) {
+          return;
+        }
+
+        if (datum.severity in SEVERITY_CSS) {
+          return self.getSeverity(datum, valueMetadata);
+        }
+
+        return NOMINAL_SEVERITY;
+      }
+    };
+  }
+  getSeverity(datum, valueMetadata) {
+    if (!valueMetadata) {
+      return;
+    }
+
+    const severityValue = datum.severity;
+
+    return {
+      cssClass: SEVERITY_CSS[severityValue],
+      name: severityValue
+    };
+  }
+
+  supportsLimits(domainObject) {
+    return domainObject.type === 'eventGenerator';
+  }
+}