A methodology that enables a system to be modeled as a set of objects that can be controlled and manipulated in a modular manner
0
votes
2answers
185 views
Without using Singletons, what is a good way to manage a global resource?
Unlike many libraries SDL and OpenGL are designed to provide global resources; you can access them at any time from any class. There are justifications for this: They are written in C, meant to be ...
0
votes
1answer
89 views
Should “magic” getter functions be used for dynamically calculated values or just existing properties?
For example, if I had a Customer class and wanted to get all orders by them. Would it be better to do:
class Customer{
public function getOrders(){
return results from db query
}
}
...
0
votes
3answers
161 views
Can the circle-ellipse problem be solved by reversing the relationship?
Having Circle extend Ellipse breaks the Liskov Substition Principle, because it modifies a postcondition: namely, you can set X and Y independently to draw an ellipse, but X must always equal Y for ...
-2
votes
3answers
159 views
Is it possible to have private or protected objects in Java? Or are all objects considered public?
Is it possible to have private objects? For example, when you instantiate an object (classType object1 = new classType()), can that be private or protected or is it always public?
0
votes
1answer
58 views
How do you write super() in the UML format?Is it correct to write super(parameter: type): return type in the UML methods section?
Suppose you write a subclass that extends to a certain class and in that subclass, you use the super() method for your constructor.
Would you write "super(parameter: type): return type" in the UML?
2
votes
1answer
192 views
For Object Oriented Programming purists, are @annotations heresy?
Philosophical Question:
An issue that occurred to me is that especially when using frameworks like Spring or Hibernate ( which are everywhere in industry), we have annotate everything.
This is ...
-2
votes
2answers
42 views
How to allow Object creation of a class on only particular classes in PHP?
In PHP, let there be four classes A, B, C, and D. None of them inherits the other. They are all independent classes. Now, I want only B and C to be able to create Objects of the class A. D Should not ...
5
votes
4answers
220 views
Rule of thumb for deciding which class a method belongs to
For example, imagine a website which stores results about a certain sport or game, which has a typical "season" structure, such that there's both a Player and a Season class. To retrieve a player's ...
0
votes
1answer
42 views
Design patterns for ERP software with clients and web service
I'll will make ERP software for managing data for business activities. The solution must have two big parts: a WPF application for all the clients and an ASP MVC Web API application for all the ...
5
votes
3answers
301 views
Best practices for using public, protected, private?
Is it fair to say that it is good practice to default everything to private up front when coding something?
And then only upgrade it to protected if a subclass needs it, or public if another class ...
0
votes
1answer
61 views
How to store state data when the data is related to another entity?
In order to increase the parallel-ability of my objects, I try to make them read-only and include only data that naturally belong to the entity. I have
class Object { ... };
class Processor {
...
4
votes
3answers
326 views
Should every object know how to present/draw themselves?
David West in his book Object Thinking (chapter 10, section 1, sub-section 2) proposed that in an ideal OO environment, every objects should be capable of presenting themselves upon request; be it to ...
1
vote
2answers
73 views
Is it good design to log something related to an object from the callee?
I am designing a class whose object is instaniated with a user idn which creates a pdf with that user specific details. It should log something depending on success or failure which can be determined ...
0
votes
5answers
240 views
Is there a better way to debug while avoiding getters/setters?
I'm thinking about how to debug better without using Getters/Setters. If it helps, I program using xcode.
Many answers in Stack Exchange have argued against Getters/Setters for lack of encapsulation ...
4
votes
1answer
42 views
Logging multiple objects for various reasons, then grouping by that reason
I'm having trouble cleaning up my code, and was wondering if there was any sort of pattern that I'm not aware of that can help me in this situation.
I need to process a list of objects in various ...
3
votes
2answers
187 views
Using MVC style, where is the best place to put SQL functionality?
I am wondering about best practices here.
MVC (Model - View - Controller) patterns involve separating components of your program that model the data, manipulate those models, and display those ...
-2
votes
0answers
41 views
API Wrappers: Should I return Objects or arrays? Or maybe there is no difference?
I have some 3rd party API that I'm building a wrapper around it.
The API is "...a RESTful web API, to which you POST data to, the API response is an XML or JSON output."
I wonder, should I return ...
5
votes
4answers
247 views
Why instantiate an object to a Base class rather than a specific Sub class?
For example:
URL blogFeedUrl = new URL("http://manishmaharzan.com.np/getJSON/json.json");
HttpURLConnection connection = (HttpURLConnection) blogFeedUrl.openConnection();
connection.connect();
...
1
vote
1answer
69 views
Split class into two or leave as one
I have the following class:
internal class LeaveRequest : ServiceBase
{
private const string InvalidRequestMessage = "Specified Request does not exist";
private const string ...
0
votes
3answers
67 views
What is the accepted practice for handling numeric conversions under OOP?
I am making a weather app that involves temperatures. You can change between Kelvin, Celsius, and Fahrenheit just for fun.
However, temperature figures get used all over the place in different ways. ...
-2
votes
1answer
92 views
Is there an official name for the “one object disease” anti-pattern (iterative single object operations on databases, services etc.)?
It is caused by the naive programming paradigm: focus on just a single object, do something with it, and if you have to work with many objects, you loop, iterate and traverse, repeating the operation ...
1
vote
3answers
68 views
Should I keep “redirect only” methods in my Controller?
Controller:
function indexAction()
{
if ($condition)
$this->renumPosition($id); //LINE #1
}
//Redirect only - function's sole purpose is to call another function
function ...
5
votes
1answer
88 views
Is there such a thing as a workflow pattern? or how to do a workflow properly?
(and alternatives to a workflow engine)
Problem:
I have various inputs with various attributes.
For example {name: john, country: US} and {name: Jose, country: MX}
And I have the following workflows ...
-1
votes
3answers
177 views
What to do with database foreign keys in an entity class?
I know that an attribute defines the state of an object. So, is it correct to keep attributes that don't define the state of an object of a class?
For example, I have an Employee class, which has ...
3
votes
6answers
304 views
Can we say “If a parent class never appears in my codes except in its child class, it should be composition instead of inheritance”?
I read some posts about "composition over inheritance","where to use composition/inheritance" , "Is-a relationship..." or "Liskov substitution principle" for some time, but I am not sure if I get the ...
0
votes
0answers
67 views
Should we add an extra class to this code sample
I have a shopping website which allows users to place orders. In my web application when the users click 'Create Order' i call an OrderService class which looks like the below:
public class ...
0
votes
4answers
240 views
How to convince “old” co-workers of the merits of OO for certain applications [closed]
I am working as SAP developer, where in many cases you have traditional requirements to applications (reports):
Read in some data from the database or a file
Do some magic with that data, e.g. do ...
1
vote
1answer
101 views
Alternatives to anonymous class
In the language I work with, Progress OpenEdge 11.5.1, there is nothing like anonymous classes. However, the system design would really benefit the use of such classes.
Is there some nice known way ...
2
votes
1answer
114 views
Are nested private classes considered composition?
Background
I am considering a design that includes a public API class containing many nested private classes. I am doing this for the following reasons:
Why private nesting? They will have no use ...
0
votes
2answers
134 views
Per my design requirements, does this design hierarchy seem reasonable?
Background
Construction
Note that I am using C# here, but it may not be necessary to provide input to my conceptual questions about design. Consider the following design methodology...
I work at a ...
0
votes
0answers
5 views
Setting two objects equal to each other and finding the Boolean result of it [migrated]
Calendar calendar = new GregorianCalendar(2015, 2, 1);
Calendar calendar1 = calendar;
Calendar calendar2 = (Calendar)calendar.clone();
System.out.println("calendar == calendar1 is " + (calendar == ...
0
votes
3answers
267 views
Java constructors confusion? [closed]
public class example
{
private String one;
private String two;
public example(String one, String two)
{
this.one = one;
this.two = two;
}
public static void ...
4
votes
3answers
177 views
What is the purpose of writing functions and methods? When should you make a snippet of code into a function or method?
I have a philosophical disagreement with one of my co-workers, and I'm trying to get back to basics here. What is the purpose of a method?
In this question, consider this example. I was criticized ...
1
vote
1answer
106 views
Is a an object Necessary or can I still use a DataTable
I'm currently working on a fund project and I have it set up so I get the holdings from my database and store in in to a DataTable to process.
I've created a function where my Database results are ...
19
votes
5answers
3k views
Is it okay for a class to use its own public method?
Background
I currently have a situation where I have an object that is both transmitted and received by a device. This message has several constructs, as follows:
public void ReverseData()
public ...
0
votes
0answers
69 views
How do I replicate my object-ish style from Python into Golang?
I've been going around in circles on this for a while Googling and reading, time to ask experts.
When coding my common approach is to create a type of thing and add it to some sort of list with ...
4
votes
3answers
66 views
Using Multiple 'Sub-types' vs a larger single type?
I have a user model in an application that I'm working on, which currently uses sub-types to encapsulate properties depending on what type of user you are - I just can't help but think that this is ...
8
votes
4answers
2k views
Why would passing objects through static methods be advantageous?
Why would there be an advantage to use a static method and pass the reference to an object as a parameter rather than calling the method on an object?
To clarify what I mean, consider the following ...
3
votes
1answer
103 views
Avoiding tightly coupled class definitions in Python for has-a relationships
I have the following code:
class Car(object):
def __init__(self, my_id):
self.my_id = my_id
self.color = color
self.brand = brand
self.get_color()
...
1
vote
1answer
133 views
Is it sensible to write a wrapper to use an OO library in this procedural project?
I am writing a program using a procedural style.
At most I have some modules where the logic is present (one to retrieve data from, one to display the info, one with the saving logic, etc.), but my ...
237
votes
17answers
18k views
Why have private fields, isn't protected enough?
Is the visibility private of class fields/properties/attributes useful? In OOP, sooner or later, you are going to make a subclass of a class and in that case, it is good to understand and being able ...
9
votes
3answers
240 views
Are Python mixins an anti-pattern?
I'm fully aware that pylint and other static analysis tools are not all-knowing, and sometimes their advice must be disobeyed. (This applies for various classes of messages, not just conventions.)
...
-1
votes
1answer
130 views
Does this pattern have a name?
I have a large XML file that I extract information from.
I am extracting the information using a list of classes with a main method of the type ParsedValue[] GetValue(BigXmlFile).
This is a bit like ...
11
votes
4answers
851 views
Why is there no consistent definition of essential concepts to OOP?
I am very new to coding and a bit confused from reading\hearing different conventions from different sources:
Does Object-oriented programming have 4 or 5 concepts?
As a newcomer, I understand these ...
5
votes
1answer
428 views
Are we abusing static methods?
A couple of months ago I started working in a new project, and when going through the code it stroke me the amount of static methods used. Not only utility methods as ...
5
votes
2answers
84 views
Should Modelling Document Analysis?
I use UML
I, like most (I think), use UML as my main diagramming toolset. UML is clear and useful for representing OOP and has sufficiently diverse diagrams that there is something for whatever area ...
1
vote
2answers
181 views
Multiple instance of the same class?
I have a class named "Category" to handle all the operations and data about my categories. Now, my class is created however I need to find a way to build an object for each of the categories in my ...
1
vote
4answers
98 views
File-Directory Implementation: Does a a file have to own a reference to it's dir?
I am currently issuing a problem while forming the program-design, which is exact like a File-Directory relationship, and to ease it, I am using that as an example.
I think it is usual, that a ...
2
votes
2answers
79 views
How do I decide whether to make an Input/Output data type an array or a class?
I have some input that I send to a computational library, which processes the input and produces some output.
Question: What considerations do I take into account to help me decide whether the ...
4
votes
1answer
197 views
Do I have to stop using Dependency Injection to keep object debug printouts small?
Say I have a large object - think EntityManager of an ORM such as Doctrine, or a custom DAO object, or what have you. Object, output of which is required to be used inside a class, but the object ...
