@nyteshade/lattice-legacy

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class="page-title">GQLEnum.js</h1> <section> <article> <pre class="prettyprint source linenums"><code>/** @namespace GQLInterface @flow */ import { GQLBase } from './GQLBase' import { GraphQLEnumType, parse } from 'graphql' import { Getters } from './decorators/ModelProperties' import { LatticeLogs as ll } from './utils' /* Internal Symbol referring to real accessor to GQLBase model object */ const _MODEL_KEY = Symbol.for('data-model-contents-value'); /* Internal Symbol referring to the static object containing a proxy handler */ const _PROXY_HANDLER = Symbol.for('internal-base-proxy-handler') /* Internal Symbol property referring to the mapping of values on the GQLEnum */ const ENUMS = Symbol(); /** * GraphQL Enum types can be a bit picky when it comes to how scalar types * equate to enum values. Lattice makes this easier by allowing you to specify * a value or the key when your enum has a value other than the key; GraphQL * does not allow this by default. * * Further more, when instantiating a GQLEnum type, you can pass a string or * value matching the enum key or value or you can pass an object with key of * value and the value being either the enum key or value. If any of those * things match, then your `instance.value` will equate to the enum's key. If, * on the other hand, your supplied values do not match then `instance.value` * will be `null`. * * @class GQLEnum */ @Getters('symbol') export class GQLEnum extends GQLBase { constructor(enumValueOrKey: ?Object, requestData: ?Object) { super({}, requestData) const Class = this.constructor const enums = Class.enums; let symbol; let enumVK: (Object | string | null) = enumValueOrKey || null // @ComputedType symbol = enums[enumVK] || enumVK && enums[enumVK.value] || null Object.assign(this.getModel(), { name: symbol ? symbol.name : null, value: symbol ? symbol.value : null, symbol: symbol ? symbol : null }) } /** * Retrieves the actual symbol stored name property from the internal * model object for this enum instance. That is a mouthfull, but it * basically means that if your enum is something like: * * ``` * enum Person { TALL, SHORT } * ``` * * and you create an instance using any of the following * * ``` * p = new Person('TALL') * p = new Person(valueFor('TALL')) * p = new Person({value: 'TALL'}) * ``` * * that your response to `p.name` will equate to `TALL`. * * @method ⬇︎⠀name * @memberof GQLEnum * @return {mixed} typically a String but any valid type supplied */ get name(): mixed { const name = this.getModel().name return ( name !== undefined && name !== null && name !== NaN ) ? name : null; } /** * Much like the `.name` getter, the `.value` getter will typically * retreive the name of the enum key you are requesting. In rare cases * where you have defined values that differ from the name, the `.value` * getter will retrieve that custom value from the `.value` property on * the symbol in question. * * This should do the right thing even if you instantiated the instance * using the name. * * @memberof GQLEnum * @method ⬇︎⠀value * @return {mixed} the value of the enum type; this in all likihood should * be a String or potentially an object */ get value(): mixed { const value = this.getModel().value return ( value !== undefined && value !== null && value !== NaN ) ? value : null; } /** * Determines the default type targeted by this GQLBase class. Any * type will technically be valid but only will trigger special behavior * * @memberof GQLEnum * @method ⬇︎⠀GQL_TYPE * @static * @const * * @return {Function} a type, such as `GraphQLObjectType` or * `GraphQLInterfaceType` */ static get GQL_TYPE(): Function { return GraphQLEnumType; } /** * Each instance of GQLEnum must specify a map of keys and values. If this * method returns null or is not defined, the value of the enum will match * the name of the enum as per the reference implementation. * * Example: * ``` * static get values(): ?Object { * const { valueOf } = this; * * return { * NAME: valueOf(value) * } * } * ``` * * @method ⬇︎⠀values * @memberof GQLEnum * @static * * @return {Object|Null} an object mapping with each key mapping to an object * possessing at least a value field, which in turn maps to the desired value */ static get values(): Object { return {}; } /** * Shorthand method to generate a GraphQLEnumValueDefinition implementation * object. Use this for building and customizing your `values` key/value * object in your child classes. * * @memberof GQLEnum * @method valueFor * @static * * @param {mixed} value any nonstandard value you wish your enum to have * @param {String} deprecationReason an optional reason to deprecate an enum * @param {String} description a non Lattice standard way to write a comment * @return {Object} an object that conforms to the GraphQLEnumValueDefinition * defined here http://graphql.org/graphql-js/type/#graphqlenumtype */ static valueFor( value: mixed, deprecationReason: ?string, description: ?string ): Object { const result: Object = { value } if (deprecationReason) { result.deprecationReason = deprecationReason } if (description) { result.description = description } return result; } /** * For easier use within JavaScript, the static enums method provides a * Symbol backed solution for each of the enums defined. Each `Symbol` * instance is wrapped in Object so as to allow some additional properties * to be written to it. * * @memberof GQLEnum * @method ⬇︎⠀enums * @static * * @return {Array<Symbol>} an array of modified Symbols for each enum * variation defined. */ static get enums(): Array<Symbol> { // @ComputedType if (!this[ENUMS]) { const map: Map<*,*> = new Map(); const ast = parse((this.SCHEMA: any)); const array = new Proxy([], GQLEnum.GenerateEnumsProxyHandler(map)); const values = this.values || {}; let astValues: Array<any>; try { // TODO: $FlowFixMe astValues = ast.definitions[0].values; } catch (error) { ll.error('Unable to discern the values from your enums SCHEMA') ll.error(error) throw error; } // Walk the AST for the class' schema and extract the names (same as // values when specified in GraphQL SDL) and build an object the has // the actual defined value and the AST generated name/value. for (let enumDef of astValues) { let defKey = enumDef.name.value; let symObj: Object = Object(Symbol.for(defKey)); symObj.value = (values[defKey] && values[defKey].value) || defKey; symObj.name = defKey symObj.sym = symObj.valueOf() map.set(symObj.name, symObj) map.set(symObj.value, symObj) // This bit of logic allows us to look into the "enums" property and // get the generated Object wrapped Symbol with keys and values by // supplying either a key or value. array.push(symObj) } // @ComputedType this[ENUMS] = array; } // @ComputedType return this[ENUMS]; } /** * Due to the complexity of being able to access both the keys and values * properly for an enum type, a Map is used as the backing store. The handler * returned by this method is to be passed to a Proxy. * * @method GQLEnum#GenerateEnumsProxyHandler * @static * * @param {Map} map the map containing the key<->value and * value<->key mappings; the true storage backing the array in question. * @return {Object} */ static GenerateEnumsProxyHandler(map: Map<*, *>) { return { /** * Get handler for the Map backed Array Proxy * * @memberof! GQLEnum * @method get * * @param {mixed} obj the object targeted by the Proxy * @param {string} key `key` of the value being requested * @return {mixed} the `value` being requested */ get(obj, key) { if (map.has(key)) { return map.get(key) } return obj[key] }, /** * Set handler for the Map backed Array Proxy. * * @memberof! GQLEnum * @method set * * @param {mixed} obj the object the Proxy is targeting * @param {string} key a string `key` being set * @param {mixed} value the `value` being assigned to `key` */ set(obj, key, value) { if (isFinite(key) && value instanceof Symbol) { map.set(value.name, value) map.set(value.value, value) } // Some accessor on the receiving array obj[key] = value; // Arrays return length when pushing. Assume value as return // otherwise. ¯\_(ツ)_/¯ return isFinite(key) ? obj.length : obj[key]; } } } /** @inheritdoc */ static apiDocs(): Object { const { DOC_CLASS, DOC_FIELDS, joinLines } = this; return { [DOC_CLASS]: joinLines` GQLEnums allow the definition of enum types with description fields and values other than a 1:1 mapping of their types and their type names. If you are reading this, the implementor likely did not contribute comments for their type. ` } } } </code></pre> </article> </section> </div> <footer> Generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.5.5</a> on Sat Feb 17 2018 00:27:31 GMT-0800 (PST) using the Minami theme. </footer> <script>prettyPrint();</script> <script src="scripts/linenumber.js"></script> </body> </html>