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Interface.js
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Interface.js
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/*
---
name: Interface
description: Interfaces for Class to ensure certain properties are defined.
authors: Christoph Pojer (@cpojer), Luis Merino (@Rendez)
license: MIT-style license.
requires: [Core/Type, Core/Class]
provides: Interface
...
*/
(function(context){
this.Interface = new Type('Interface', function(object){
if (object.Implements){
Array.from(object.Implements).each(function(item){
Object.append(this, item);
}, this);
delete object.Implements;
}
return Object.append(this, object);
});
Class.Mutators.initialize = function(fn){
return this.prototype.Interface ? function(){
var result = fn.apply(this, arguments);
if (!this.Interface) return result;
var interfaces = Array.from(this.Interface);
for (var i = 0; i < interfaces.length; i++){
var iface = interfaces[i];
for (var key in iface){
if (key.charAt(0) == '$') continue; // Skip Internal
if (!(key in this)) throw new Error('Instance does not implement "' + key + '"');
var item = this[key],
object = iface[key];
if (object == null) continue;
var type = typeOf(item),
oType = typeOf(object);
// Needs to be same datatype OR instance of the provided object
if (type != oType && !instanceOf(item, object)){
var proto = object.prototype,
name = (proto && proto.$family) ? proto.$family().capitalize() : object.displayName;
throw new Error('Property "' + key + '" is implemented but not an instance of ' + (name ? '"' + name + '"' : 'the expected type'));
}
if (oType == 'function' && item.$origin.length < object.length)
throw new Error('Property "' + key + '" does not implement at least ' + object.length + ' parameter' + (object.length != 1 ? 's' : ''));
}
}
return result;
} : fn;
};
}).call(typeof exports != 'undefined' ? exports : this);