105 lines
3.0 KiB
JavaScript
105 lines
3.0 KiB
JavaScript
/*
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* basestar
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* cylonjs.com
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*
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* Copyright (c) 2013-2014 The Hybrid Group
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* Licensed under the Apache 2.0 license.
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*/
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"use strict";
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var EventEmitter = require('events').EventEmitter;
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var Utils = require('./utils');
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// Basestar is a base class to be used when writing external Cylon adaptors and
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// drivers. It provides some useful base methods and functionality
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//
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// It also extends EventEmitter, so child classes are capable of emitting events
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// for other parts of the system to handle.
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var Basestar = module.exports = function Basestar() {
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};
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Utils.subclass(Basestar, EventEmitter);
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// Public: Proxies calls from all methods in the object to a target object
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//
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// methods - array of methods to proxy
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// target - object to proxy methods to
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// source - object to proxy methods from
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// force - whether or not to overwrite existing method definitions
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//
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// Returns the klass where the methods have been proxied
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Basestar.prototype.proxyMethods = function(methods, target, source, force) {
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if (force == null) {
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force = false;
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}
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return Utils.proxyFunctionsToObject(methods, target, source, force);
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};
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// Public: Defines an event handler that proxies events from a source object
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// to a target object
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//
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// opts - object containing options:
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// - targetEventName or eventName - event that should be emitted from the
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// target
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// - target - object to proxy event to
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// - source - object to proxy event from
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// - sendUpdate - whether or not to send an 'update' event
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//
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// Returns the source
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Basestar.prototype.defineEvent = function(opts) {
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opts.sendUpdate = opts.sendUpdate || false;
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opts.targetEventName = opts.targetEventName || opts.eventName;
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opts.source.on(opts.eventName, function() {
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var args = arguments.length >= 1 ? [].slice.call(arguments, 0) : [];
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args.unshift(opts.targetEventName);
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opts.target.emit.apply(opts.target, args);
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if (opts.sendUpdate) {
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args.unshift('update');
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opts.target.emit.apply(opts.target, args);
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}
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});
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return opts.source;
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};
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// Public: Creates an event handler that proxies events from an adaptor's
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// 'connector' (reference to whatever module is actually talking to the hw)
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// to the adaptor's associated connection.
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//
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// opts - hash of opts to be passed to defineEvent()
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//
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// Returns this.connector
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Basestar.prototype.defineAdaptorEvent = function(opts) {
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if (typeof opts === 'string') {
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opts = { eventName: opts };
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}
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opts['source'] = this.connector;
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opts['target'] = this.connection;
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return this.defineEvent(opts);
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};
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// Public: Creates an event handler that proxies events from an device's
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// 'connector' (reference to whatever module is actually talking to the hw)
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// to the device's associated connection.
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//
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// opts - hash of opts to be passed to defineEvent()
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//
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// Returns this.connection
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Basestar.prototype.defineDriverEvent = function(opts) {
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if (typeof opts === 'string') {
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opts = { eventName: opts };
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}
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opts['source'] = this.connection;
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opts['target'] = this.device;
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return this.defineEvent(opts);
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};
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