87 lines
3.2 KiB
JavaScript
87 lines
3.2 KiB
JavaScript
/*****************************************************************************
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* Open MCT Web, Copyright (c) 2014-2015, United States Government
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* as represented by the Administrator of the National Aeronautics and Space
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* Administration. All rights reserved.
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*
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* Open MCT Web is licensed under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0.
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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* Open MCT Web includes source code licensed under additional open source
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* licenses. See the Open Source Licenses file (LICENSES.md) included with
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* this source code distribution or the Licensing information page available
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* at runtime from the About dialog for additional information.
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*****************************************************************************/
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/*global define*/
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define(
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[],
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function () {
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"use strict";
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/**
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* A policy that will test whether a given object OR all of its
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* support historical telemetry
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*/
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function ConductorPolicy($q) {
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this.$q = $q;
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}
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function fastPromise(value) {
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return {
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then: function (callback) {
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return fastPromise(callback(value));
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}
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}
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}
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function and(array) {
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return array.reduce(function (previous, next) {
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return previous && next;
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}, true);
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}
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function or(array) {
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return array.reduce(function (previous, next) {
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return previous || next;
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}, false);
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}
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/**
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* @param {DomainObject} candidate
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* @returns {Promise} a promise resolved with true if the object
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* supports historical telemetry
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*/
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ConductorPolicy.prototype.allow = function (candidate) {
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var self = this;
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//Does the object itself allow the time conductor?
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if (candidate.hasCapability('telemetry') && candidate.getCapability('telemetry').getMetadata().historical) {
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return fastPromise(true);
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} else {
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//If not, do all of its constituents allow time conductor?
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if (candidate.hasCapability('composition')) {
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return candidate.useCapability('composition').then(function (composition) {
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if (composition.length === 0 ) {
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return fastPromise(false);
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} else {
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return self.$q.all(composition.map(self.allow.bind(self))).then(or);
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}
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});
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} else {
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//if no, hide time conductor
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return fastPromise(false);
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}
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}
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};
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return ConductorPolicy;
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}
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); |