/
AssociativeArray.js
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/
AssociativeArray.js
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import defined from "./defined.js";
import DeveloperError from "./DeveloperError.js";
/**
* A collection of key-value pairs that is stored as a hash for easy
* lookup but also provides an array for fast iteration.
* @alias AssociativeArray
* @constructor
*/
function AssociativeArray() {
this._array = [];
this._hash = {};
}
Object.defineProperties(AssociativeArray.prototype, {
/**
* Gets the number of items in the collection.
* @memberof AssociativeArray.prototype
*
* @type {Number}
*/
length: {
get: function () {
return this._array.length;
},
},
/**
* Gets an unordered array of all values in the collection.
* This is a live array that will automatically reflect the values in the collection,
* it should not be modified directly.
* @memberof AssociativeArray.prototype
*
* @type {Array}
*/
values: {
get: function () {
return this._array;
},
},
});
/**
* Determines if the provided key is in the array.
*
* @param {String|Number} key The key to check.
* @returns {Boolean} <code>true</code> if the key is in the array, <code>false</code> otherwise.
*/
AssociativeArray.prototype.contains = function (key) {
//>>includeStart('debug', pragmas.debug);
if (typeof key !== "string" && typeof key !== "number") {
throw new DeveloperError("key is required to be a string or number.");
}
//>>includeEnd('debug');
return defined(this._hash[key]);
};
/**
* Associates the provided key with the provided value. If the key already
* exists, it is overwritten with the new value.
*
* @param {String|Number} key A unique identifier.
* @param {*} value The value to associate with the provided key.
*/
AssociativeArray.prototype.set = function (key, value) {
//>>includeStart('debug', pragmas.debug);
if (typeof key !== "string" && typeof key !== "number") {
throw new DeveloperError("key is required to be a string or number.");
}
//>>includeEnd('debug');
var oldValue = this._hash[key];
if (value !== oldValue) {
this.remove(key);
this._hash[key] = value;
this._array.push(value);
}
};
/**
* Retrieves the value associated with the provided key.
*
* @param {String|Number} key The key whose value is to be retrieved.
* @returns {*} The associated value, or undefined if the key does not exist in the collection.
*/
AssociativeArray.prototype.get = function (key) {
//>>includeStart('debug', pragmas.debug);
if (typeof key !== "string" && typeof key !== "number") {
throw new DeveloperError("key is required to be a string or number.");
}
//>>includeEnd('debug');
return this._hash[key];
};
/**
* Removes a key-value pair from the collection.
*
* @param {String|Number} key The key to be removed.
* @returns {Boolean} True if it was removed, false if the key was not in the collection.
*/
AssociativeArray.prototype.remove = function (key) {
//>>includeStart('debug', pragmas.debug);
if (defined(key) && typeof key !== "string" && typeof key !== "number") {
throw new DeveloperError("key is required to be a string or number.");
}
//>>includeEnd('debug');
var value = this._hash[key];
var hasValue = defined(value);
if (hasValue) {
var array = this._array;
array.splice(array.indexOf(value), 1);
delete this._hash[key];
}
return hasValue;
};
/**
* Clears the collection.
*/
AssociativeArray.prototype.removeAll = function () {
var array = this._array;
if (array.length > 0) {
this._hash = {};
array.length = 0;
}
};
export default AssociativeArray;