I was working on my website written in php/mysql. When I first wrote it, it was spaghetti with lots of php embedded in html and the like - very hard to maintain. I rewrote the whole thing with a nice modular structure with OOPS, and now it is much easier to maintain and expand. But when testing the site performance using webwait and si...
Consider the task: Read a polygon from a KML file using library A Intersect it with another polygon using library B Calculate its area using library C Each library has it's own Polygon class, and they are all equivalent. Which is the best practice when using all these classes? At the moment I first wrote this question I had imp...
Hello, I've read all the books about why to create a class and things like "look for the nouns in your requirements" but it doesn't seem to be enough. My classes seem to me to be messy. I would like to know if there are some sort of metrics or something that I can compare my classes to and see if there well designed. If not, who is the ...
Hello. I have main php-file with main class. Also in this class i do require_once("func.php"); which has many useful functions for my site. Size of func.php is very big, because there is many functions for different actions on different pages. But I include it on every page, because including called by main class. What I need to d...
I have the following: var o = {f: function(fn) { fn.call(o); }}; var ob = {f: function() { o.f(function() { this.x = 2; //HERE: how can this reference ob? //ob.x = 2; }); }}; ob.f(); ob.x; // undefined o.f(fn) calls fn where this is bound to o. At HERE, I want to use this to access ob. However, when ob.f i...
I'm faced with a situation that I think can only be solved by using a ref parameter. However, this will mean changing a method to always accept a ref parameter when I only need the functionality provided by a ref parameter 5% of the time. This makes me think "whoa, crazy, must find another way". Am I being stupid? What sort of problems ...
After switching from C++ to C++ w/boost, do you think your OOD skills improved? Do you notice patterns in "Normal" C++ code that you wouldn't consider that you've switched, or do you find that it enables a more abstract design? I guess I'm really wondering if you just use it as a tool, or if you change your entire approach to OO desi...
I am implementing a Data Access Layer (DAL), which is basically a set of classes with (VB.NET) Shared functions to actually execute the database (CRUD) calls. I am trying to figure out the best place to place the calls to the DAL within the class hierarchy. Let me give an example. Suppose I have a class Customer, with only standard ID, ...
What is the advantage to have all my classes instantiated only through the Factory DP? As far as know a Factory is good when you have to choose from a list of similar objects to perform some task,let's say like translations classes (english-> franch, arab->hebrew ...) But when you have really one possible option, no reason to obscure/ab...
Can anyone think of any situation to use multiple inheritance? Every case I can think of can be solved by the method operator AnotherClass() { return this->something.anotherClass; } ...
I have been programming OO for a while. But now I feel I have reached a place where I need to understand principles and fundamentals of object oriented design and theory scientifically and deeply. What resource, especially books can you suggest? ...
I am often in a situation where I have a concept represented by an interface or class, and then I have a series of subclasses/subinterfaces which extend it. For example: A generic "DoiGraphNode" A "DoiGraphNode" representing a resource A "DoiGraphNode" representing a Java resource A "DoiGraphNode" with an associated path, etc., etc. ...
Lets say you have a class SomeClass which has its own implementation of toString(), and also has the ability to parse a new instance of itself by reading that same string. Which of these methods do you prefer, or find better to use? You can either define it as another constructor: public SomeClass(String serializedString); or you can...
So I want to build a form validation class/object in javascript. The way I see it working would be something like this: var form=new Validation(); form.addField("name","Your name","required"); form.addField("email","Email Address","is_email"); ......... form.validate(); I was thinking that the validation class would be defined someth...
If you have Class A with an instance var "foo" which has a @property/@synthesize directive, and Class B inherits from Class A, does it also need to @property/@synthesize "foo"? The reason I ask is because when I try to use Class B's "foo", the calling class says that "foo" is not something of a structured union or a member, which makes m...
I'm writing documentation for an object-oriented language, and I wonder what kind of classes would be a good example for inheritance. Some common examples: class Person { } class Employee extends Person { } Currently my favorite, but I don't like Person->Employee because 'Employee' does not exactly look like fun. class Bicycle { } c...
I have this object: function formBuddy() { var fields = new Array(); var labels = new Array(); var rules = new Array(); var count=0; this.addField = function(field, label, rule) { fields[count] = field; labels[field] = label; rules[field] = rule; count = ++count; } } Its use...
How do you choose between implementing a value object (the canonical example being an address) as an immutable object or a struct? Are there performance, semantic or any other benefits of choosing one over the other? ...
I have two table with parent child relationship and still confuse how to map it into class from tables. Simple class which encapsulate methods and not using Business Object / Value Object. The tables are category and product. When a webform list product from a category, what approach I should do? Create Category object and call GetProd...
I'm trying to wrap my head about how to properly implement an OOP design for business objects that: Have a "master list" in a database (ex. classifications) Are a part of another object as a property (i.e. object composition) but with additional properties Here is where I'm stuck on the theory. Suppose that I have a Classification ob...