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/**
Code copyright Dustin Diaz and Ross Harmes, Pro JavaScript Design Patterns.
**/
 
// Constructor.
var Interface = function (name, methods) {
if (arguments.length != 2) {
throw new Error("Interface constructor called with " + arguments.length + "arguments, but expected exactly 2.");
}
this.name = name;
this.methods = [];
for (var i = 0, len = methods.length; i < len; i++) {
if (typeof methods[i] !== 'string') {
throw new Error("Interface constructor expects method names to be " + "passed in as a string.");
}
this.methods.push(methods[i]);
}
};
 
 
// Static class method.
Interface.ensureImplements = function (object) {
if (arguments.length < 2) {
throw new Error("Function Interface.ensureImplements called with " + arguments.length + "arguments, but expected at least 2.");
}
for (var i = 1, len = arguments.length; i < len; i++) {
var interface = arguments[i];
if (interface.constructor !== Interface) {
throw new Error("Function Interface.ensureImplements expects arguments" + "two and above to be instances of Interface.");
}
for (var j = 0, methodsLen = interface.methods.length; j < methodsLen; j++) {
var method = interface.methods[j];
if (!object[method] || typeof object[method] !== 'function') {
throw new Error("Function Interface.ensureImplements: object " + "does not implement the " + interface.name + " interface. Method " + method + " was not found.");
}
}
}
};

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