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by akl_gate4com

JavaScript

/**
    Code copyright Dustin Diaz and Ross Harmes, Pro JavaScript Design Patterns.
    
    Modified by Andreas Klein, Gate4 GmbH
**/

// 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 property in methods) {
          if (methods.hasOwnProperty(property)) {
            if (typeof methods[property] !== 'function') {
                throw new Error("Interface constructor expects method names to be passed in as a function.");
            } 
            var signature = /(.+)\((.*)\)/g.exec(methods[property].toString().replace(/(\s)|(\/\*.*\*\/)|(\/\/[\w\s\']*)|(\<![\-\-\s\w\>\/]*\>)/g,'')); 
            var interfaceMethodParameter = signature[2].match(/([a-zA-Z_][\w]*)/g);
              interfaceMethodParameter = interfaceMethodParameter ? interfaceMethodParameter.length : 0;
            this.methods.push({"method":property, "parameter":interfaceMethodParameter});
          }
        }
    };


// 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].method;
            var interfaceMethodParameter = interface.methods[j].parameter;
            
            if (!object[method] || typeof object[method] !== 'function') {
 ...