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62 lines
2.0 KiB
JavaScript
62 lines
2.0 KiB
JavaScript
/*****************************************************************************
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* Open MCT, Copyright (c) 2014-2016, 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 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 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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define([], function () {
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var NULL_PATH;
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function Path(item, path) {
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this.item = item;
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this.parent = path || NULL_PATH;
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}
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Path.prototype.matches = function (path) {
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return (this.item === path.head()) && this.parent.matches(path.path());
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};
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Path.prototype.head = function () {
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return this.item;
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};
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Path.prototype.depth = function () {
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return 1 + this.parent.depth();
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};
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Path.prototype.tail = function () {
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return this.parent;
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};
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Path.prototype.append = function (item) {
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return new Path(item, this);
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};
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NULL_PATH = new Path(undefined, undefined);
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NULL_PATH.parent = NULL_PATH;
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NULL_PATH.depth = function () {
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return 0;
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};
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NULL_PATH.matches = function (path) {
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return path.depth() === 0;
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};
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return Path;
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});
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