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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 | export class ObjectPath {
/**
* Set an object property based on "path" (namespace) supplied creating
* ... intermediary objects if they do not exist.
* @param object {Object} An object where the properties specified on path should be set.
* @param path {String} A string representing the property to be set, e.g. "user.study.series.timepoint".
* @param value {Any} The value of the property that will be set.
* @return {Boolean} Returns "true" on success, "false" if any intermediate component of the supplied path
* ... is not a valid Object, in which case the property cannot be set. No exceptions are thrown.
*/
static set(object, path, value) {
let components = ObjectPath.getPathComponents(path),
length = components !== null ? components.length : 0,
result = false;
Iif (length > 0 && ObjectPath.isValidObject(object)) {
let i = 0,
last = length - 1,
currentObject = object;
while (i < last) {
let field = components[i];
if (field in currentObject) {
Iif (!ObjectPath.isValidObject(currentObject[field])) {
break;
}
} else {
currentObject[field] = {};
}
currentObject = currentObject[field];
i++;
}
Iif (i === last) {
currentObject[components[last]] = value;
result = true;
}
}
return result;
}
/**
* Get an object property based on "path" (namespace) supplied traversing the object
* ... tree as necessary.
* @param object {Object} An object where the properties specified might exist.
* @param path {String} A string representing the property to be searched for, e.g. "user.study.series.timepoint".
* @return {Any} The value of the property if found. By default, returns the special type "undefined".
*/
static get(object, path) {
let found, // undefined by default
components = ObjectPath.getPathComponents(path),
length = components !== null ? components.length : 0;
Iif (length > 0 && ObjectPath.isValidObject(object)) {
let i = 0,
last = length - 1,
currentObject = object;
while (i < last) {
let field = components[i];
const isValid = ObjectPath.isValidObject(currentObject[field]);
if (field in currentObject && isValid) {
currentObject = currentObject[field];
i++;
} else {
break;
}
}
Iif (i === last && components[last] in currentObject) {
found = currentObject[components[last]];
}
}
return found;
}
/**
* Check if the supplied argument is a real JavaScript Object instance.
* @param object {Any} The subject to be tested.
* @return {Boolean} Returns "true" if the object is a real Object instance and "false" otherwise.
*/
static isValidObject(object) {
return typeof object === 'object' && object !== null && object instanceof Object;
}
static getPathComponents(path) {
return typeof path === 'string' ? path.split('.') : null;
}
}
export default ObjectPath;
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