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• Create subdomains via C-Panel or via domain registrar?

  - by cybergeek654

  I am a novice, so excuse me if it sounds dummy. I read a few similar questions on this topic here but they did not answer my question. I have a personal website, hosted with C-panel control panel. Via C-panel I can easily create new subdomains and I do not need to apply any DNS settings or so. And the subdomian is good to go immediately and are working fine. I have unlimited subdomains option. When I check my DNS management control panel in my domain registrar's site, there is no record associated with my subdomains. Now I want to buy a new domain name from 1and1, and have it as an add-on domain in my prevouse host. 1and1 say they only allow 5 subdomains. What does this mean? Can not I create unlimited subdomains under my new domain name, just as I do for my old domain? How does C-panel create and manage subdomains that there is nothing about it in my DNS control panel? Thanks for your help

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• When choosing a domain does including your brand affect SEO performance?

  - by bpeterson76

  I've been asked to build a "landing page" for a local branch of an international corporation. While the corporation has a well-established domain name, the local office wants to use a unique, separate url that will be easy for them to relay to clients. However, the corporation is considered a category leader, so the local office is also concerned about the importance to carrying over the company's brand to the URL. Questions that have arisen: From an SEO perspective, is there a benefit to including the brand name in the URL? Would it be more beneficial to buy a domain that relates generically to the INDUSTRY as opposed to the specific brand name? Would the benefits of an easy-to-remember, short domain outweigh any SEO benefits that might be gained by a longer, brand-specific domain?

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• Are there any services that sell 'packs' of domain names?

  - by DC_

  Are there any services that sell 'packs' of domain names? What I'm looking for is a service that will allow me to buy, for example, 50 random domain names. I don't care what the names are, they could be kjsgadkj286.mobi for all I care. Does anything like this exist? I am not interested in registering them myself. I thought that maybe domain squatters or someone similar might have leftover worthless names they want to get rid of.

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• The Message Queuing service failed to join the computer's domain 'DOMAIN' Error 0xc00e0025

  - by SimonGoldstone

  Struggling to get MSMQ installed in Domain Integration mode on Windows 2012 (Azure). So far, I've provisioned a brand new Windows Server 2012 (R2) machine on the Azure platform and installed the Active Directory role and promoted the machine to a domain controller. Once the AD was in place, I then added the MSMQ feature, along with the Directory Integration add on. However, it will not install in AD integration mode. It will only work in Workgroup mode. I can verify this by running the following powershell command: New-MSMQQueue -name Queue1 -queuetype Public When I run this command, I get the following error: New-MsmqQueue : A workgroup installation computer does not support the operation. The event viewer reveals to errors in the Application log: 1. The Message Queuing service failed to join the computer's domain 'DOMAIN'. Error 0xc00e0025: 2. Message Queuing was unable to create the msmq (MSMQ Configuration) object in Active Directory Domain Services. Error c00e0025h: I'm struggling here. Any advice?

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• Mod_rewrite display subdomain.domain.com and call domain.com/subdomain/ for SSL

  - by Jeff H.

  I have a website secured by a standard SSL certificate, securing a few different shops under different subdirectories. Ex. domain.com/shop1/ The shops are also accessible via a subdomain e.g. shop1.domain.com. What I'm trying to accomplish: display shop1.domain.com to the user, while keeping all of the actual server calls as domain.com/shop1, so that the secure pages will continue to work properly. (Not sure if I'm using the proper language, exactly, I hope my point is clear.) To be clear: my SSL is working fine, and I don't need help with that, and I don't need or want to purchase a UCC cert. It can't be that difficult for anyone with experience with Apache. (I've spent 3 hours trying to learn about mod_rewrite. It's just not clicking.) I'm on a GoDaddy secure shared server, so please keep in mind that I'm not able to reset the server or anything.

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• Sending email from an alternative domain to protect my "core" domain from spam filters

  - by Jack7890

  I run a website (seatgeek.com) that sends a lot of transactional email to users--account updates, alerts, etc. It's important to us that our domain remains clean in the eyes of spam filters. We'd like to roll out an email marketing campaign. It's nothing particularly spammy, but this would be the first time we ever emailed to people who hadn't expressly asked to receive email from us. It's to market a new product we built to a specific niche of professionals. In order to protect our domain in the eyes of spam filters, we're considering sending the marketing email from an alternative domain. The alternative domain is an alternative landing page we sometimes use for this new product. Is there any way this could backfire on us? Does it seem like a particularly poor idea?

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• HTTPS in sub domain redirects to main domain

  - by Amitabh

  We recently bought a wildcard certificate and installed it for a domain. It works fine for the main domain but seems to not work at all for any sub domains. Whats happening is we can access the sub domains fine on HTTP, but whenever we try HTTPS for the same sub domain url we are redirected back to the main domain. So if I put up a test folder "httpstest" in a sub domain with a index.html file in it, the following happens mysubdomain.mywebsite.com/httpstest/index.html or mysubdomain.mywebsite.com/httpstest/ works perfectly fine with http:// but mysubdomain.mywebsite.com/httpstest/ or mysubdomain.mywebsite.com/httpstest/index.html does not work with https:// and redirects to the main domain.Any help on this is greatly appreciated. The site is not the main site used for setting up the VPS. It was added from WHM. Environment: We are on a Linux VPS. Cpanel 11.30.6 , Apache 2.2.22, PHP 5.3.13 The Virtualhost entry looks like: <VirtualHost xx.xx.xxx.xx:443> ServerName my-own-website.com ServerAlias www.my-own-website.com DocumentRoot /home/amitabh/public_html ServerAdmin [email protected] UseCanonicalName Off CustomLog /usr/local/apache/domlogs/my-own-website.com combined CustomLog /usr/local/apache/domlogs/my-own-website.com-bytes_log "%{%s}t %I .\n%{%s}t %O ." ## User amitabh # Needed for Cpanel::ApacheConf <IfModule mod_suphp.c> suPHP_UserGroup amitabh amitabh </IfModule> <IfModule !mod_disable_suexec.c> SuexecUserGroup amitabh amitabh </IfModule> ScriptAlias /cgi-bin/ /home/amitabh/public_html/cgi-bin/ SSLEngine on SSLCertificateFile /etc/ssl/certs/my-own-website.com.crt SSLCertificateKeyFile /etc/ssl/private/my-own-website.com.key SSLCACertificateFile /etc/ssl/certs/my-own-website.com.cabundle CustomLog /usr/local/apache/domlogs/my-own-website.com-ssl_log combined SetEnvIf User-Agent ".*MSIE.*" nokeepalive ssl-unclean-shutdown <Directory "/home/amitabh/public_html/cgi-bin"> SSLOptions +StdEnvVars </Directory> # To customize this VirtualHost use an include file at the following location # Include "/usr/local/apache/conf/userdata/ssl/2/amitabh/my-own-website.com/*.conf" </VirtualHost>` I guess I messed up the formatting big time. Any help on formatting and on the issue is great appreciated. Thank you. Update: I could not update the formatting here. I posted the same question in a linux forum . I will really appreciate any pointer on it.

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• JS closures - Passing a function to a child, how should the shared object be accessed

  - by slicedtoad

  I have a design and am wondering what the appropriate way to access variables is. I'll demonstrate with this example since I can't seem to describe it better than the title. Term is an object representing a bunch of time data (a repeating duration of time defined by a bunch of attributes) Term has some print functionality but does not implement the print functions itself, rather they are passed in as anonymous functions by the parent. This would be similar to how shaders can be passed to a renderer rather than defined by the renderer. A container (let's call it Box) has a Schedule object that can understand and use Term objects. Box creates Term objects and passes them to Schedule as required. Box also defines the print functions stored in Term. A print function usually takes an argument and uses it to return a string based on that argument and Term's internal data. Sometime the print function could also use data stored in Schedule, though. I'm calling this data shared. So, the question is, what is the best way to access this shared data. I have a lot of options since JS has closures and I'm not familiar enough to know if I should be using them or avoiding them in this case. Options: Create a local "reference" (term used lightly) to the shared data (data is not a primitive) when defining the print function by accessing the shared data through Schedule from Box. Example: var schedule = function(){ var sched = Schedule(); var t1 = Term( function(x){ // Term.print() return (x + sched.data).format(); }); }; Bind it to Term explicitly. (Pass it in Term's constructor or something). Or bind it in Sched after Box passes it. And then access it as an attribute of Term. Pass it in at the same time x is passed to the print function, (from sched). This is the most familiar way for my but it doesn't feel right given JS's closure ability. Do something weird like bind some context and arguments to print. I'm hoping the correct answer isn't purely subjective. If it is, then I guess the answer is just "do whatever works". But I feel like there are some significant differences between the approaches that could have a large impact when stretched beyond my small example.

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• 1 domain.. 2 server and 2 applications

  - by basit.

  i have a site like twitter.com on server one and on server two i have forum, which path is like domain.com/forum on server one i wanted to implement wild card dns and put main domain on it. but on server two i wanted to keep forum separate, i cant give sub-domain forum.domain.com, because all its links are already put in search engines and link back to domain.com/forum. so i was wondering, how can i put domain and wild card dns on server one and still able to give path on server 2 for domain.com/forum (as sub-folder). any ideas? do you think htaccess can do that job? if yes, then how?

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• Accessing resources on localhost using domain credentials

  - by jas

  I'm trying to set up Team Foundation Server 2010, Sharepoint Server 2010 and Report Server 2008R2. I apologize for how long my question/problem is but I'm really lost on where to even look so am being as descriptive as possible in hopes that I'm making sense. The goal: Since developers can be inside or outside the firewall there needs to be a single http point of entry to TFS that works regardless of which side of the firewall you are and needs to work with external access to SharePoint and Report Server. Meaning we have it set up in DNS so buildserver.mydomain.com: points to the build service box which contains all of the services listed at the top of this post and specific services are defined/located by the port number. This is working great on every machine inside and out except for from the build server itself. All services must be able to work using external URLs. If I use http:// buildserver.mydomain.com:4800/tfs (the external URL) from my notebook which is behind the firewall I'm able to login with my domain credentials as expected. If the other developer points to the same URL from their home which isn't on the domain they are also able to login using their domain credentials. However if I am directly on buildserver and call SharePoint, TFS or Reporting Server from (i.e. http:// buildserver.mydomain.com:4800) itself using the external URL, I am prompted for a username and password. Entering my domain credentials results in another prompt to enter my credentials again. It will prompt three times regardless of which credentials are used (I have rights as a domain admin) and then after the third prompt directs me to a blank white page as though access was denied. There are no errors displayed on the page and nothing ends up in the event viewer. From buildserver if i use just the host name (the internal URL), then I'm prompted a single time for credentials and it works. i.e. http:// buildserver:4800/tfs works from the server itself. The behavior is identical for any service requiring authentication. Meaning from the box itself Sharepoint Central Admin, SharePoint WebApp, TFS, TFS Web Access, Report Server and Report Manager all fail using the external URL but will succeed if called using the interal URL. So the problem comes into play when configuring all of the services to work together. The only way to configure TFS is locally from the server which means I must point to the internal reporting server url (http:// buildserver:4800/reports and reportServer respectively instead of http:// buildserver.domainname.com:4800 like they need to be) since external URLs aren't working from itself. If I configure TFS to use the internal URL for Report Server then creating team projects or working in the SharePoint site for the team project fails for anyone not inside the domain since their machines have no idea who http:// buildserver:/reports even is or how to resolve them. I have configured Sharepoint with Alternate Access Mappings as well as set up Report Server to listen for external URLs. The external URLs simply aren't working when called from the server itself. I hope this makes sense. Thanks for taking the time to read this rather verbose plea for help.

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• Javascript Reference Outer Object From Inner Object

  - by Akidi

  Okay, I see a few references given for Java, but not javascript ( which hopefully you know is completely different ). So here's the code specific : function Sandbox() { var args = Array.prototype.slice.call(arguments) , callback = args.pop() , modules = (args[0] && typeof args[0] === 'string' ? args : args[0]) , i; if (!(this instanceof Sandbox)) { return new Sandbox(modules, callback); } if (!modules || modules[0] === '*') { modules = []; for (i in Sandbox.modules) { if (Sandbox.modules.hasOwnProperty(i)) { modules.push(i); } } } for (i = 0; i < modules.length; i++) { Sandbox.modules[modules[i]](this); } this.core = { 'exp': { 'classParser': function (name) { return (new RegExp("(^| )" + name + "( |$)")); }, 'getParser': /^(#|\.)?([\w\-]+)$/ }, 'typeOf': typeOf, 'hasOwnProperty': function (obj, prop) { return obj.hasOwnProperty(prop); }, 'forEach': function (arr, fn, scope) { scope = scope || config.win; for (var i = 0, j = arr.length; i < j; i++) { fn.call(scope, arr[i], i, arr); } } }; this.config = { 'win' : win, 'doc' : doc }; callback(this); } How do I access this.config.win from within this.core.forEach? Or is this not possible?

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• How to create a link to Nintex Start Workflow Page in the document set home page

  - by ybbest

  In this blog post, I’d like to show you how to create a link to start Nintex Workflow Page in the document set home page. 1. Firstly, you need to upload the latest version of jQuery to the style library of your team site. 2. Then, upload a text file to the style library for writing your own html and JavaScript 3. In the document set home page, insert a new content editor web part and link the text file you just upload. 4. Update the text file with the following content, you can download this file here. <script type="text/javascript" src="/Style%20Library/jquery-1.9.0.min.js"></script> <script type="text/javascript" src="/_layouts/sp.js"></script> <script type="text/javascript"> $(document).ready(function() { listItemId=getParameterByName("ID"); setTheWorkflowLink("YBBESTDocumentLibrary"); }); function buildWorkflowLink(webRelativeUrl,listId,itemId) { var workflowLink =webRelativeUrl+"_layouts/NintexWorkflow/StartWorkflow.aspx?list="+listId+"&ID="+itemId+"&WorkflowName=Start Approval"; return workflowLink; } function getParameterByName(name) { name = name.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]"); var regexS = "[\\?&]" + name + "=([^&#]*)"; var regex = new RegExp(regexS); var results = regex.exec(window.location.search); if(results == null){ return ""; } else{ return decodeURIComponent(results[1].replace(/\+/g, " ")); } } function setTheWorkflowLink(listName) { var SPContext = new SP.ClientContext.get_current(); web = SPContext.get_web(); list = web.get_lists().getByTitle(listName); SPContext.load(web,"ServerRelativeUrl"); SPContext.load(list, 'Title', 'Id'); SPContext.executeQueryAsync(setTheWorkflowLink_Success, setTheWorkflowLink_Fail); } function setTheWorkflowLink_Success(sender, args) { var listId = list.get_id(); var listTitle = list.get_title(); var webRelativeUrl = web.get_serverRelativeUrl(); var startWorkflowLink=buildWorkflowLink(webRelativeUrl,listId,listItemId) $("a#submitLink").attr('href',startWorkflowLink); } function setTheWorkflowLink_Fail(sender, args) { alert("There is a problem setting up the submit exam approval link"); } </script> <a href="" target="_blank" id="submitLink"><span style="font-size:14pt">Start the approval process.</span></a> 5. Save your changes and go to the document set Item, you will see the link is on the home page now. Notes: 1. You can create a link to start the workflow using the following build dynamic string configuration: {Common:WebUrl}/_layouts/NintexWorkflow/StartWorkflow.aspx?list={Common:ListID}&ID={ItemProperty:ID}&WorkflowName=workflowname. With this link you will still need to click the start button, this is standard SharePoint behaviour and cannot be altered. References: http://connect.nintex.com/forums/27143/ShowThread.aspx How to use html and JavaScript in Content Editor web part in SharePoint2010

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• Do unit tests sometimes break encapsulation?

  - by user1288851

  I very often hear the following: "If you want to test private methods, you'd better put that in another class and expose it." While sometimes that's the case and we have a hiding concept inside our class, other times you end up with classes that have the same attributes (or, worst, every attribute of one class become a argument on a method in the other class) and exposes functionality that is, in fact, implementation detail. Specially on TDD, when you refactor a class with public methods out of a previous tested class, that class is now part of your interface, but has no tests to it (since you refactored it, and is a implementation detail). Now, I may be not finding an obvious better answer, but if my answer is the "correct", that means that sometimes writting unit tests can break encapsulation, and divide the same responsibility into different classes. A simple example would be testing a setter method when a getter is not actually needed for anything in the real code. Please when aswering don't provide simple answers to specific cases I may have written. Rather, try to explain more of the generic case and theoretical approach. And this is neither language specific. Thanks in advance. EDIT: The answer given by Matthew Flynn was really insightful, but didn't quite answer the question. Altough he made the fair point that you either don't test private methods or extract them because they really are other concern and responsibility (or at least that was what I could understand from his answer), I think there are situations where unit testing private methods is useful. My primary example is when you have a class that has one responsibility but the output (or input) that it gives (takes) is just to complex. For example, a hashing function. There's no good way to break a hashing function apart and mantain cohesion and encapsulation. However, testing a hashing function can be really tough, since you would need to calculate by hand (you can't use code calculation to test code calculation!) the hashing, and test multiple cases where the hash changes. In that way (and this may be a question worth of its own topic) I think private method testing is the best way to handle it. Now, I'm not sure if I should ask another question, or ask it here, but are there any better way to test such complex output (input)? OBS: Please, if you think I should ask another question on that topic, leave a comment. :)

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• Is this proper OO design for C++?

  - by user121917

  I recently took a software processes course and this is my first time attempting OO design on my own. I am trying to follow OO design principles and C++ conventions. I attempted and gave up on MVC for this application, but I am trying to "decouple" my classes such that they can be easily unit-tested and so that I can easily change the GUI library used and/or the target OS. At this time, I have finished designing classes but have not yet started implementing methods. The function of the software is to log all packets sent and received, and display them on the screen (like WireShark, but for one local process only). The software accomplishes this by hooking the send() and recv() functions in winsock32.dll, or some other pair of analogous functions depending on what the intended Target is. The hooks add packets to SendPacketList/RecvPacketList. The GuiLogic class starts a thread which checks for new packets. When new packets are found, it utilizes the PacketFilter class to determine the formatting for the new packet, and then sends it to MainWindow, a native win32 window (with intent to later port to Qt).1 Full size image of UML class diagram Here are my classes in skeleton/header form (this is my actual code): class PacketModel { protected: std::vector<byte> data; int id; public: PacketModel(); PacketModel(byte* data, unsigned int size); PacketModel(int id, byte* data, unsigned int size); int GetLen(); bool IsValid(); //len >= sizeof(opcode_t) opcode_t GetOpcode(); byte* GetData(); //returns &(data[0]) bool GetData(byte* outdata, int maxlen); void SetData(byte* pdata, int len); int GetId(); void SetId(int id); bool ParseData(char* instr); bool StringRepr(char* outstr); byte& operator[] (const int index); }; class SendPacket : public PacketModel { protected: byte* returnAddy; public: byte* GetReturnAddy(); void SetReturnAddy(byte* addy); }; class RecvPacket : public PacketModel { protected: byte* callAddy; public: byte* GetCallAddy(); void SetCallAddy(byte* addy); }; //problem: packets may be added to list at any time by any number of threads //solution: critical section associated with each packet list class Synch { public: void Enter(); void Leave(); }; template<class PacketType> class PacketList { private: static const int MAX_STORED_PACKETS = 1000; public: static const int DEFAULT_SHOWN_PACKETS = 100; private: vector<PacketType> list; Synch synch; //wrapper for critical section public: void AddPacket(PacketType* packet); PacketType* GetPacket(int id); int TotalPackets(); }; class SendPacketList : PacketList<SendPacket> { }; class RecvPacketList : PacketList<RecvPacket> { }; class Target //one socket { bool Send(SendPacket* packet); bool Inject(RecvPacket* packet); bool InitSendHook(SendPacketList* sendList); bool InitRecvHook(RecvPacketList* recvList); }; class FilterModel { private: opcode_t opcode; int colorID; bool bFilter; char name[41]; }; class FilterFile { private: FilterModel filter; public: void Save(); void Load(); FilterModel* GetFilter(opcode_t opcode); }; class PacketFilter { private: FilterFile filters; public: bool IsFiltered(opcode_t opcode); bool GetName(opcode_t opcode, char* namestr); //return false if name does not exist COLORREF GetColor(opcode_t opcode); //return default color if no custom color }; class GuiLogic { private: SendPacketList sendList; RecvPacketList recvList; PacketFilter packetFilter; void GetPacketRepr(PacketModel* packet); void ReadNew(); void AddToWindow(); public: void Refresh(); //called from thread void GetPacketInfo(int id); //called from MainWindow }; I'm looking for a general review of my OO design, use of UML, and use of C++ features. I especially just want to know if I'm doing anything considerably wrong. From what I've read, design review is on-topic for this site (and off-topic for the Code Review site). Any sort of feedback is greatly appreciated. Thanks for reading this.

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• When modeling a virtual circuit board, what is the best design pattern to check for cycles?

  - by Wallace Brown

  To make it simple assume you have only AND and OR gates. Each has two inputs and one output. The output of two inputs can be used as an input for the next gate For example: A AND B - E C AND D - F E OR F - G Assuming an arbitrary number of gates, we want to check if the circuit ever connects back into itself at an earlier state? For example: E AND F - A This should be illegal since it creates an endless cycle. What design pattern would best be able to check for these cycles?

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• How can I move a load of zone records from a web based system to text based one?

  - by Chris Adams

  Hi there, I have a few domains with Dreamhost where I have set a load of records using their web based domain name system, and I've like to move them to another provider that lets me enter info directly as a text file for their name server, bind 9 to use. (If you're interested, I'm moving them to Gandi.net). Previously when I used a cpanel based system to do something similar, there was a tool that let me simply enter a domain name, and any available domains were automagically entered into a system, saving me typing it myself (and bringing down sites with silly typos in the process). What open source tool can I use to query a domain for all the relevant subdomains and records and list them in a format like a zone file, that I can use with other name servers?

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• Requesting feedback on my OO design

  - by Prog

  I'm working on an application that creates music by itself. I'm seeking feedback for my OO design so far. This question will focus on one part of the program. The application produces Tune objects, that are the final musical products. Tune is an abstract class with an abstract method play. It has two subclasses: SimpleTune and StructuredTune. SimpleTune owns a Melody and a Progression (chord sequence). It's play implementation plays these two objects simultaneously. StructuredTune owns two Tune instances. It's own play plays the two Tunes one after the other according to a pattern (currently only ABAB). Melody is an abstract class with an abstract play method. It has two subclasses: SimpleMelody and StructuredMelody. SimpleMelody is composed of an array of notes. Invoking play on it plays these notes one after the other. StructuredMelody is composed of an array of Melody objects. Invoking play on it plays these Melodyies one after the other. I think you're starting to see the pattern. Progression is also an abstract class with a play method and two subclasses: SimpleProgression and StructuredProgression, each composed differently and played differently. SimpleProgression owns an array of chords and plays them sequentially. StructuredProgression owns an array of Progressions and it's play implementation plays them sequentially. Every class has a corresponding Generator class. Tune, Melody and Progression are matched with corresponding abstract TuneGenerator, MelodyGenerator and ProgressionGenerator classes, each with an abstract generate method. For example MelodyGenerator defines an abstract Melody generate method. Each of the generators has two subclasses, Simple and Structured. So for example MelodyGenerator has a subclasses SimpleMelodyGenerator, with an implementation of generate that returns a SimpleMelody. (It's important to note that the generate methods encapsulate complex algorithms. They are more than mere factory method. For example SimpleProgressionGenerator.generate() implements an algorithm to compose a series of Chord objects, which are used to instantiate the returned SimpleProgression). Every Structured generator uses another generator internally. It is a Simple generator be default, but in special cases may be a Structured generator. Parts of this design are meant to allow the end-user through the GUI to choose what kind of music is to be created. For example the user can choose between a "simple tune" (SimpleTuneGenerator) and a "full tune" (StructuredTuneGenerator). Other parts of the system aren't subject to direct user-control. What do you think of this design from an OOD perspective? What potential problems do you see with this design? Please share with me your criticism, I'm here to learn. Apart from this, a more specific question: the "every class has a corresponding Generator class" part feels very wrong. However I'm not sure how I could design this differently and achieve the same flexibility. Any ideas?

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• Books, resources and so on about GUI architecture [on hold]

  - by Moses

  I'm making first steps in GUI programming. Earlier I've had little experience with GUI and I remember that it was kind of pain. Code was either coupled or to verbose with tons of "Listeners". It seems to me that problem in me and not in a library that I used(Swing). So, could you recommend me some books, tutorials or resources where I can find how to design gui programms? Emphasize that I'm interested in architecture and not in how to use components of some framework(which about 90% of tutorials that I've ever seen).

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• Switch vs Polymorphism when dealing with model and view

  - by Raphael Oliveira

  I can't figure out a better solution to my problem. I have a view controller that presents a list of elements. Those elements are models that can be an instance of B, C, D, etc and inherit from A. So in that view controller, each item should go to a different screen of the application and pass some data when the user select one of them. The two alternatives that comes to my mind are (please ignore the syntax, it is not a specific language) 1) switch (I know that sucks) //inside the view controller void onClickItem(int index) { A a = items.get(index); switch(a.type) { case b: B b = (B)a; go to screen X; x.v1 = b.v1; // fill X with b data x.v2 = b.v2; case c: go to screen Y; etc... } } 2) polymorphism //inside the view controller void onClickItem(int index) { A a = items.get(index); Screen s = new (a.getDestinationScreen()); //ignore the syntax s.v1 = a.v1; // fill s with information about A s.v2 = a.v2; show(s); } //inside B Class getDestinationScreen(void) { return Class(X); } //inside C Class getDestinationScreen(void) { return Class(Y); } My problem with solution 2 is that since B, C, D, etc are models, they shouldn't know about view related stuff. Or should they in that case?

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• OOD: All classes at bottom of hierarchy contain the same field

  - by My Head Hurts

  I am creating a class diagram for what I thought was a fairly simple problem. However, when I get to the bottom of the hierarchy, all of the classes only contain one field and it is the same one. This to me looks very wrong, but this field does not belong in any of the parent classes. I was wondering if there are any suggested design patterns in a situation like this? A simplified version of the class diagram can be found below. Note, fields named differently cannot belong to any other class +------------------+ | ObjectA | |------------------| | String one | | String two | | | +---------+--------+ | +---------------+----------------+ | | +--------|--------+ +--------|--------+ | ObjectAA | | ObjectAB | |-----------------| |-----------------| | String three | | String four | | | | | +--------+--------+ +--------+--------+ | | | | +--------|--------+ +--------|--------+ | ObjectAAA | | ObjectABA | |-----------------| |-----------------| | String five | | String five | | | | | +-----------------+ +-----------------+ ASCII tables drawn using http://www.asciiflow.com/

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• Liskov substitution and abstract classes / strategy pattern

  - by Kolyunya

  I'm trying to follow LSP in practical programming. And I wonder if different constructors of subclasses violate it. It would be great to hear an explanation instead of just yes/no. Thanks much! P.S. If the answer is no, how do I make different strategies with different input without violating LSP? class IStrategy { public: virtual void use() = 0; }; class FooStrategy : public IStrategy { public: FooStrategy(A a, B b) { c = /* some operations with a, b */ } virtual void use() { std::cout << c; } private: C c; }; class BarStrategy : public IStrategy { public: BarStrategy(D d, E e) { f = /* some operations with d, e */ } virtual void use() { std::cout << f; } private: F f; };

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• Help migrating from VB style programming to OO programming [closed]

  - by Agent47DarkSoul

  Being a hobbyist Java developer, I quickly took on with OO programming and understood its advantages over procedural code from C, that I did in college. But I couldn't grasp VB event based code (weird, right?). Bottom-line is OOP came natural to me. Curently I work in a small development firm developing C# applications. My peers here are a bit attached to VB style programming. Most of the C# code written is VB6 event handling code in C#'s skin. I tried explaining to them OOP with its advantages but it wasn't clear to them, maybe because I have never been much of a VB programmer. So can anybody provide any resources: books, web articles on how to migrate from VB style to OO style programming ?

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• Using dot To Access Object Attribute and Proper abstraction

  - by cobie

  I have been programming in python and java for quite a number of years and one thing i find myself doing is using the setters and getters from java in python but a number of blogs seem to think using the dot notation for access is the pythonic way. What I would like to know is if using dot to access methods does not violate abstraction principle. If for example I implement an attribute as a single object and use dot notation to access, if I wanted to change the code later so that the attribute is represented by a list of objects, that would require quite some heavy lifting which violates abstraction principle.

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• Child object free movement on Parent object

  - by The415

  Just to be straightforward, I am completely new to many aspects of coding and am searching for different specs and guidelines to aid me on my journey to crafting a wonderful game in Epic Games' Unreal Engine 4. Okay, I know upon viewing this, some may have little to no clue what I mean, so I'll put it like this to explain what I mean : Imagine a third person game with a simple model of a character. Now, say I have an object as a torso of a character in a game. Now Say I have an object as a head of the character. How could I keep the head as a child of the torso, but at the same time, allow it to move with the camera angle.

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• Confused about implementing Single Responsibility Principle

  - by HichemSeeSharp

  Please bear with me if the question looks not well structured. To put you in the context of my issue: I am building an application that invoices vehicles stay duration in a parking. In addition to the stay service there are some other services. Each service has its own calculation logic. Here is an illustration (please correct me if the design is wrong): public abstract class Service { public int Id { get; set; } public bool IsActivated { get; set; } public string Name { get; set } public decimal Price { get; set; } } public class VehicleService : Service { //MTM : many to many public virtual ICollection<MTMVehicleService> Vehicles { get; set; } } public class StayService : VehicleService { } public class Vehicle { public int Id { get; set; } public string ChassisNumber { get; set; } public DateTime? EntryDate { get; set; } public DateTime? DeliveryDate { get; set; } //... public virtual ICollection<MTMVehicleService> Services{ get; set; } } Now, I am focusing on the stay service as an example: I would like to know at invoicing time which class(es) would be responsible for generating the invoice item for the service and for each vehicle? This should calculate the duration cost knowing that the duration could be invoiced partially so the like is as follows: not yet invoiced stay days * stay price per day. At this moment I have InvoiceItemsGenerator do everything but I am aware that there is a better design.

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