// Constructor.

Cobalt.Core.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.

Cobalt.Core.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 objInterface = arguments[i];
        if(objInterface.constructor !== Cobalt.Core.Interface) {
            throw new Error("Function Interface.ensureImplements expects arguments "   
              + "two and above to be instances of Interface.");
        }
        
        for(var j = 0, methodsLen = objInterface.methods.length; j < methodsLen; j++) {
            var method = objInterface.methods[j];
            if(!object[method] || typeof object[method] !== 'function') {
                throw new Error("Function Interface.ensureImplements: object " 
                  + "does not implement the " + objInterface.name 
                  + " interface. Method " + method + " was not found.");
            }
        }
    } 
};