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href="GQLBase.html#%25E2%258C%25BE%25E2%25A0%2580setModel">⌾⠀setModel</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="GQLBase.html#%25E2%25AC%2586%25EF%25B8%258E%25E2%25A0%2580requestData">⬆︎⠀requestData</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="GQLBase.html#%25E2%25AC%2587%25EF%25B8%258E%25E2%25A0%2580requestData">⬇︎⠀requestData</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="GQLBase.html#~deleteProperty">deleteProperty</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="GQLBase.html#~set">set</a></span></li><li class="nav-heading"><span class="nav-item-type type-class">C</span><span class="nav-item-name"><a href="GQLBase.%25E2%258E%2586%25E2%25A0%2580constructor.html">⎆⠀constructor</a></span></li><li class="nav-heading"><span class="nav-item-type type-class">C</span><span class="nav-item-name"><a href="GQLEnum.html">GQLEnum</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="GQLEnum.html#..get">.get</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="GQLEnum.html#..set">.set</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="GQLEnum.html#.valueFor">valueFor</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="GQLEnum.html#.%25E2%25AC%2587%25EF%25B8%258E%25E2%25A0%2580enums">⬇︎⠀enums</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="GQLEnum.html#.%25E2%25AC%2587%25EF%25B8%258E%25E2%25A0%2580name">⬇︎⠀name</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="GQLEnum.html#.%25E2%25AC%2587%25EF%25B8%258E%25E2%25A0%2580value">⬇︎⠀value</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="GQLEnum.html#.%25E2%25AC%2587%25EF%25B8%258E%25E2%25A0%2580values">⬇︎⠀values</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="GQLEnum.html#GenerateEnumsProxyHandler">GenerateEnumsProxyHandler</a></span></li><li class="nav-heading"><span class="nav-item-type type-class">C</span><span class="nav-item-name"><a href="GQLExpressMiddleware.html">GQLExpressMiddleware</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a 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type-function">F</span><span class="nav-item-name"><a href="ModuleParser.html#%25E2%258C%25BE%25E2%25A0%2580parseSync">⌾⠀parseSync</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="ModuleParser.html#~%25E2%258C%25BE%25E2%25A0%2580walk">⌾⠀walk</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="ModuleParser.html#~%25E2%258C%25BE%25E2%25A0%2580walkSync">⌾⠀walkSync</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="ModuleParser.html#~%25E2%258E%2586%25E2%25A0%2580constructor">⎆⠀constructor</a></span></li><li class="nav-heading"><span class="nav-item-type type-class">C</span><span class="nav-item-name"><a href="ModuleParser.exports.ModuleParser.html">exports.ModuleParser</a></span></li><li class="nav-heading"><span class="nav-item-type type-class">C</span><span class="nav-item-name"><a href="SchemaUtils.html">SchemaUtils</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SchemaUtils.html#.%25E2%258C%25BE%25E2%25A0%2580createMergedRoot">⌾⠀createMergedRoot</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SchemaUtils.html#.%25E2%258C%25BE%25E2%25A0%2580injectComments">⌾⠀injectComments</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SchemaUtils.html#.%25E2%258C%25BE%25E2%25A0%2580injectEnums">⌾⠀injectEnums</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SchemaUtils.html#.%25E2%258C%25BE%25E2%25A0%2580injectInterfaceResolvers">⌾⠀injectInterfaceResolvers</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SchemaUtils.html#.%25E2%258C%25BE%25E2%25A0%2580injectScalars">⌾⠀injectScalars</a></span></li><li class="nav-heading"><span class="nav-item-type type-class">C</span><span class="nav-item-name"><a href="SyntaxTree.html">SyntaxTree</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#.%25E2%258C%25BE%25E2%25A0%2580EmptyDocument">⌾⠀EmptyDocument</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#.%25E2%258C%25BE%25E2%25A0%2580EmptyMutation">⌾⠀EmptyMutation</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#.%25E2%258C%25BE%25E2%25A0%2580EmptyQuery">⌾⠀EmptyQuery</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#.%25E2%258C%25BE%25E2%25A0%2580findDefinition">⌾⠀findDefinition</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#.%25E2%258C%25BE%25E2%25A0%2580findField">⌾⠀findField</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#.%25E2%258C%25BE%25E2%25A0%2580findInASTArrayByNameValue">⌾⠀findInASTArrayByNameValue</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#.%25E2%258C%25BE%25E2%25A0%2580from">⌾⠀from</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#.%25E2%258C%25BE%25E2%25A0%2580fromAST">⌾⠀fromAST</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#.%25E2%258C%25BE%25E2%25A0%2580fromSchema">⌾⠀fromSchema</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#.%25E2%258E%2586%25E2%25A0%2580constructor">⎆⠀constructor</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#%25E2%258C%25BE%25E2%25A0%2580appendDefinitions">⌾⠀appendDefinitions</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#%25E2%258C%25BE%25E2%25A0%2580consumeDefinition">⌾⠀consumeDefinition</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#%25E2%258C%25BE%25E2%25A0%2580find">⌾⠀find</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a 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  <h1 class="page-title">GQLEnum.js</h1>
  
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  <section>
      <article>
          <pre class="prettyprint source linenums"><code>/**
@namespace GQLInterface
@flow
*/
46
47import { GQLBase } from './GQLBase'
48import { GraphQLEnumType, parse } from 'graphql'
49import { Getters } from './decorators/ModelProperties'
50import { LatticeLogs as ll } from './utils'
51
52/* Internal Symbol referring to real accessor to GQLBase model object */
53const _MODEL_KEY = Symbol.for('data-model-contents-value');
54
55/* Internal Symbol referring to the static object containing a proxy handler */
56const _PROXY_HANDLER = Symbol.for('internal-base-proxy-handler')
57
58/* Internal Symbol property referring to the mapping of values on the GQLEnum */
59const ENUMS = Symbol();
60
61/**
* 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
*/
76@Getters('symbol')
77export class GQLEnum extends GQLBase {
constructor(enumValueOrKey: ?Object, requestData: ?Object) {
  super({}, requestData)
80
  const Class = this.constructor
  const enums = Class.enums;
  let symbol;
  let enumVK: (Object | string | null) = enumValueOrKey || null
85
  // @ComputedType
  symbol = enums[enumVK] || enumVK &amp;&amp; enums[enumVK.value] || null
88
  Object.assign(this.getModel(), {
    name: symbol ? symbol.name : null,
    value: symbol ? symbol.value : null,
    symbol: symbol ? symbol : null
  })
}
95
/**
 * 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
121
  return (
    name !== undefined &amp;&amp;
    name !== null &amp;&amp;
    name !== NaN
  ) ? name : null;
}
128
/**
 * 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
146
  return (
    value !== undefined &amp;&amp;
    value !== null &amp;&amp;
    value !== NaN
  ) ? value : null;
}
153
/**
 * 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;
}
169
/**
 * 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 {};
}
196
/**
 * 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 }
218
  if (deprecationReason) { result.deprecationReason = deprecationReason }
  if (description) { result.description = description }
221
  return result;
}
224
/**
 * 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&lt;Symbol>} an array of modified Symbols for each enum
 * variation defined.
 */
static get enums(): Array&lt;Symbol> {
  // @ComputedType
  if (!this[ENUMS]) {
    const map: Map&lt;*,*> = new Map();
    const ast = parse((this.SCHEMA: any));
    const array = new Proxy([], GQLEnum.GenerateEnumsProxyHandler(map));
    const values = this.values || {};
    let astValues: Array&lt;any>;
246
    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;
    }
256
    // 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));
263
      symObj.value = (values[defKey] &amp;&amp; values[defKey].value) || defKey;
      symObj.name = defKey
      symObj.sym = symObj.valueOf()
267
      map.set(symObj.name, symObj)
      map.set(symObj.value, symObj)
270
      // 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)
    }
276
    // @ComputedType
    this[ENUMS] = array;
  }
280
  // @ComputedType
  return this[ENUMS];
}
284
/**
 * 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&lt;->value and
 * value&lt;->key mappings; the true storage backing the array in question.
 * @return {Object}
 */
static GenerateEnumsProxyHandler(map: Map&lt;*, *>) {
  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)
      }
313
      return obj[key]
    },
316
    /**
     * 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) &amp;&amp; value instanceof Symbol) {
        map.set(value.name, value)
        map.set(value.value, value)
      }
332
      // Some accessor on the receiving array
      obj[key] = value;
335
      // Arrays return length when pushing. Assume value as return
      // otherwise. ¯\_(ツ)_/¯
      return isFinite(key) ? obj.length : obj[key];
    }
  }
}
342
/** @inheritdoc */
static apiDocs(): Object {
  const { DOC_CLASS, DOC_FIELDS, joinLines } = this;
346
  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.
    `
  }
}
356}
357</code></pre>
      </article>
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