'use strict';
const path = require('path');
const ADAPTERS = require(path.join(__dirname, './adapters/index'));
const CONTENT_ADAPTER_INTERFACE = class Adapter_Interface {
/**
* Creates an interface
* @param {Object} [options={}] A set of properties defined by keys with their allowed types as values. Each property will be required by newly constructed classes from this interface
*/
constructor (options = {}) {
this.interface = (this.interface && typeof this.interface === 'object') ? this.interface : {};
for (let key in options) {
this.interface[key] = options[key];
}
}
/**
* Constructs a new object with a prototype defined by the .adapter ensuring that instantiated class conforms to interface requirements
* @param {Object} [options={}] Values to be passed to class constructor (.adapter should be reserved for either customer class or string that matches key in ADAPTERS)
* @param {string|Function} options.adapter Required to specify type of adapter to be constructed or a class constructor that can be instantiated with new keyword
* @param {string|Function} options.responder Alias for options.adapter. If options.responder is defined options.adapter will be ignored
* @return {Object} Returns an instantiated adapter class
*/
create (options = {}) {
options.adapter = (options.responder) ? options.responder : options.adapter;
let Adapter = (typeof options.adapter === 'string') ? ADAPTERS[options.adapter] : options.adapter;
if (!Adapter) throw new Error('Could not find a corresponding adapter - for custom adapters pass the constructor as the "adapter" options');
let adapter = new Adapter(options);
let errors = [];
for (let key in this.interface) {
if (this.interface[key] !== typeof adapter[key]) errors.push(`${ key } is invalid type ${ typeof adapter[key] } and should be ${ this.interface[key] }`);
}
if (errors.length) {
let compiledErrors = errors.reduce((result, error, index) => {
if (index === errors.length - 1) result += error;
else result += `${ error }, `;
return result;
}, '');
throw new Error(compiledErrors);
}
return adapter;
}
};
module.exports = new CONTENT_ADAPTER_INTERFACE({
render: 'function',
error: 'function'
});