openmct/src/plugins/charts/BarGraphCompositionPolicy.js

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 * Open MCT, Copyright (c) 2014-2021, 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.
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 * http://www.apache.org/licenses/LICENSE-2.0.
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 * License for the specific language governing permissions and limitations
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import { BAR_GRAPH_KEY } from './BarGraphConstants';

export default function BarGraphCompositionPolicy(openmct) {
    function hasRange(metadata) {
        const rangeValues = metadata.valuesForHints(['range']);

        return rangeValues.length > 0;
    }

    function hasBarGraphTelemetry(domainObject) {
        if (!openmct.telemetry.isTelemetryObject(domainObject)) {
            return false;
        }

        let metadata = openmct.telemetry.getMetadata(domainObject);

        return metadata.values().length > 0 && hasRange(metadata);
    }

    return {
        allow: function (parent, child) {
            if ((parent.type === BAR_GRAPH_KEY)
                && (hasBarGraphTelemetry(child) === false)
            ) {
                return false;
            }

            return true;
        }
    };
}