all files / montage/core/ enum.js

75.76% Statements 25/33
60% Branches 18/30
87.5% Functions 7/8
75.76% Lines 25/33
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/**
 * @module montage/core/enum
 * @requires montage/core/core
 * @requires montage/core/logger
 */
var Montage = require("./core").Montage,
    logger = require("./logger").logger("enum");
 
/**
 * @class Enum
 * @extends Montage
 */
exports.Enum = Montage.specialize( /** @lends Enum# */ {
 
    _value: {
        value: 0
    },
 
    _members: {
        value: null
    },
 
    members: {
        get: function () {
            return this._members || (this._members = Object.keys(this));
        }
    },
 
    /**
     * @function
     * @returns itself
     */
    init : {
        value: function () {
            this._logErrorIfAlreadySeal();
            return this;
        }
    },
 
    /**
     * @function
     * @returns {Object} Object.seal(this)
     */
    initWithMembers : {
        value: function () {
            Iif (this._logErrorIfAlreadySeal()) {
                return this;
            }
 
            this._addMembers(arguments);
 
            return Object.seal(this);
        }
    },
 
 
    /**
     * @function
     * @param {Array.<string>} array of keys.
     * @param {Array} array of values.
     * @returns {Object} Object.seal(this)
     */
    initWithMembersAndValues : {
        value: function (members, values) {
            Eif (Array.isArray(members) && Array.isArray(values)) {
                Eif (members.length === values.length) {
                    Iif (this._logErrorIfAlreadySeal()) {
                        return this;
                    }
 
                    this._addMembers(members, values);
 
                } else {
                    throw new Error("the number of members must equal to the number of values");
                }
            }
 
            return Object.seal(this);
        }
    },
 
 
    /**
     * @function
     * @param {string} member The member to be added.
     * @param value
     */
    addMember : {
        value: function (member, value) {
            Eif (typeof this[member] === "undefined") {
                Object.defineProperty(this, member, {
                    writable: false,
                    configurable: false,
                    enumerable: true,
                    value: value !== void 0 && value !== null ? value : this._value++
                });
            }
        }
    },
 
    /**
     * @function
     * @returns {Object} this, but sealed
     */
    seal : {
        value: function () {
            Eif (!Object.isSealed(this)) {
                return Object.seal(this);
            }
        }
    },
 
 
    _logErrorIfAlreadySeal: {
        value: function () {
            Iif (Object.isSealed(this)) {
                logger.error(this, "Object is sealed");
 
                return true;
            }
 
            return false;
        }
    },
 
    _addMembers: {
        value: function (members, values) {
            var member, i, value;
 
            for (i = 0; typeof (member = members[i]) !== "undefined"; i++) {
                Eif (member !== null) {
                    if (values) {
                        value = values[i];
 
                        Iif (value === void 0 && value === null) {
                            throw new Error("A value of an enumeration cannot be null or undefined")
                        }
                    }
 
                    this.addMember(member, value);
                } else {
                    logger.error(this, "Member at index " + i + " is null");
                }
            }
        }
    },
 
});