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  • LSP vs OCP / Liskov Substitution VS Open Close

    - by Kolyunya
    I am trying to understand the SOLID principles of OOP and I've come to the conclusion that LSP and OCP have some similarities (if not to say more). the open/closed principle states "software entities (classes, modules, functions, etc.) should be open for extension, but closed for modification". LSP in simple words states that any instance of Foo can be replaced with any instance of Bar which is derived from Foo and the program will work the same very way. I'm not a pro OOP programmer, but it seems to me that LSP is only possible if Bar, derived from Foo does not change anything in it but only extends it. That means that in particular program LSP is true only when OCP is true and OCP is true only if LSP is true. That means that they are equal. Correct me if I'm wrong. I really want to understand these ideas. Great thanks for an answer.

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  • February OTN Member Offers

    - by Cassandra Clark
    This month we have a lot of NEW book discounts and another from Oracle Store. See full list below or go right to OTN Member Discount Page to get codes. Books Discounts - Apress Offers - 25% off eBooks bought @ apress.com. Book of the Month - Pro Oracle Database 11g Administration. Pearson - 35% off and free shipping in US C# 4.0 Unleashed Multicore Application Programming Oracle Press - 40% off and sample chapters of following titles. Oracle Streams 11g Data Replication JavaFX, A Beginner's Guide Oracle CRM on Demand Embedded Analytics Oracle CRM On Demand Combined Analyses Packt Publishing - 20% off print and 45% off ebook of below Oracle APEX titles. Oracle APEX 4.0 Cookbook Oracle Application Express 4.0 with Ext JS Oracle Application Express 3.2 - The Essentials and More Oracle Application Express Forms Converter Manning - 40% off all formats of books below: • The Joy of Clojure • Specification by Example  Manning is also offering a book excerpt and 42% off all formats of the following titles: • Portlets in Action • Tuscany SCA in Action                                                                   Oracle Store - OTN Member Exclusive: 15% off Oracle Open Office Enterprise Edition at Oracle Store To get discount codes please visit the OTN Member Discount Page.

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  • Island Generation Library

    - by thatguy
    Can anyone recommend a tile map generator (written in Java is a plus), where one can control some land types? For example: islands, large continents, singe large continent, archipelago, etc. I've been reading through many posts on the subject, it almost seems like many are just rolling their own. Before creating my own, I'm wondering if there's already an open source implementation that I might not be finding. If not, it seems like using Perlin Noise is a popular choice. Some articles I've been reading: http://simblob.blogspot.com/2010/01/simple-map-generation.html Generate islands/continents with simplex noise https://sites.google.com/site/minecraftlandgenerator/

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  • Community Programming

    - by James Hill
    Background I just began working for a religious non-profit organization. As with most non-profits, the organization is resource-poor and has no IT department to speak of. In my two months here I've received 20 requests for websites, apps, and internal automation. Many of these 20 requests have merit and would benefit the organization. I'm a .net web developer and as such the open source community is relatively foreign to me... Question For the sake of this question, lets say I'm talking about building a single, large, website. Does software (web based, hopefully) exist that would allow me to post requirements and assets (graphics and CSS) for a site, and then invite programmers to participate in the sites development? As a simple example, I could post the requirements and data for the about us page and an individual would indicate that they could/would fulfill the requirement. Upon completion, they could upload the new source code to the shared repository (github).

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  • cannot open ubuntu software center

    - by success
    I deleted some unnecessary icon themes and now my application icons are changed. I cannot open Ubuntu software center also.... the following message is displayed.... success@user-pc:~$ software-center 2012-09-12 22:24:52,048 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None' 2012-09-12 22:24:52,055 - softwarecenter.db.database - INFO - open() database: path=None use_axi=True use_agent=True Traceback (most recent call last): File "/usr/bin/software-center", line 142, in <module> app = SoftwareCenterAppGtk3(datadir, xapian_base_path, options, args) File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 387, in __init__ self.datadir) File "/usr/share/software-center/softwarecenter/ui/gtk3/panes/historypane.py", line 78, in __init__ self._get_emblems(self.icons) File "/usr/share/software-center/softwarecenter/ui/gtk3/panes/historypane.py", line 192, in _get_emblems pb = icons.load_icon(emblem, self.ICON_SIZE, 0) File "/usr/lib/python2.7/dist-packages/gi/types.py", line 43, in function return info.invoke(*args, **kwargs) gi._glib.GError: Icon 'package-install' not present in theme I also tried the following code to change the icon but no didnt work.... gksu gedit /usr/share/applications/ubuntu-software-center.desktop

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  • What is the best Video Conference integrated solution for Us? [closed]

    - by Andrei B
    we are trying to integrate a simple Video Conferencing (open source) solution into our existing application which is written in C++ and it runs on Linux. I am currently looking at using Ekiga (formely known as GnomeMeeting) or Homer Conferencing (short: Homer). My plan is to "integrate" an existing Video Conferencing client into our existing software. Please give me recommendation on which 3rd party application or library to use to add video conferencing feature to our application. PS: Please don't close this question. I asked it on StackOverflow and it got closed, so where am I supposed to ask this question? If not here, then whats the point of asking lol.

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  • Where to advertise small open-source projects

    - by Saif Bechan
    I am searching for a good recourse where I can advertise my open source project. I have made a web-development framework which I want to make available to download, and I want to target a large audience. It is an open source project so I make no money off of it, so I do not really want to pay for advertisement. I already pay for the server where the website runs, and I have spent a lot of time developing it. I opened account on various search engines webmaster tools, so people can find it on there. I have also made a video-sharing account where I uploaded a few tutorials. This can accumulate some traffic also. Can someone recommend any more places to get your work spread.

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  • Wine pollutes "Open With" application list

    - by Yi Jiang
    The dialog box in question here is the one you get with the context menu option "open with other applications". Wine seems to have inserted more than a dozen or so entries for each application I install, which makes it a pain to find the correct application: What can I do to remove the duplicates? Update: Neither of the two solutions really work. The bug is interesting, but the symptoms does not match my problem (I'm not having problem with uninstalling applications, but rather the things that are inserted after installing them), and with the other one, all references to the Wine application are removed, which actually makes the problem worse (although it may be an acceptable solution if nothing else can be found). So this is still an open question; any takers?

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  • Isn't GPL enough to make a software free as in free speech?

    - by user61852
    I have read people rebutting the fact that a certain software is free as in free speech, even when it is licensed under GPL. Some say Java isn't free because to obtain a professional certification you must get it from Oracle. Some say Java JDK is not free to re-distribute. Some people even say the openJDK is not free or open. But Java is officially GPL. Doesn't GPL explicitly mean you are free to re-distribute ? Isn't GPL enough to make a software free as in free speech ? How can Java be both GPL and not-free as in free speech ? Is there is any license that trully makes a software free beyond any possible subjetive point of view? EDIT: These question is not about names or trademarks, it's about the code.

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  • Exporting XNA class library as a DLL file

    - by Will Bagley
    I have downloaded an open source project that I intend to use with my current game. The download came with all the class files from the original project as well as a pre-compiled DLL file representing the project. I was able to easily link this DLL with my current project and get it working just fine, no problems there. The problem I now have is that I want to make a couple of changes to the original libraries (extend its functionality a bit to better suit my needs) and re-export the class library as a DLL again, but I have no clue how to do this. Is there some simple way in VS where I can just take the class library and export/compile it as a DLL file again or is there more to it than that? This seems like something that should be pretty simple but my efforts to find an answer have so far come up with nothing. Thanks in advance.

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  • VLC unable to open MRL

    - by faizal
    I am trying to play a VCD using : /usr/bin/vlc vcd:// But i get the error below : VLC media player 2.1.4 Rincewind (revision 2.1.4-0-g2a072be) [0x14ec1c8] main interface error: no suitable interface module [0x1486118] main libvlc error: interface "globalhotkeys,none" initialization failed [0x1486118] main libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface. [0x7f815c0009b8] main input error: open of `vcd://' failed [0x7f815c0009b8] main input error: Your input can't be opened [0x7f815c0009b8] main input error: VLC is unable to open the MRL 'vcd://'. Check the log for details. Any way to resolve this ?

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  • Lending epub files for limited time to users

    - by JP Hellemons
    I am looking for components to build a digital library who lends people epub (ebooks) for about a week. It's like a digital version of the offline old public library. Now I have found several flash (pdf) file streaming solutions. But that would require an active internet link. And like the public library, you are able to take your books to the beach or pool on holiday abroad where you have no connection. So streaming is no option. The other file restriction method I have found was DRM, but that would require a really expensive license of Adobe Content Server 4 which is not suitable for my little hobby project. But it seems that adobe content server and Adobe Digital Editions is the only option at the moment. Or are there open source alternatives?

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  • La plateforme open source équivalente à .NET présente MonoDevelop 2.4, un environnement de développe

    Mise à jour du 18.06.2010 par Katleen La plateforme open source équivalente à .NET présente MonoDevelop 2.4, un environnement de développement accompagné de nouveautés Le projet Mono est un clone open source de la plateforme .NET de Microsoft. Son responsable, Miguel de Icaza, a annoncé il y a quelques heures l'arrivée de l'environnement de développement MonoDevelop 2.4, compatible avec Linux, Windows et Mac OS X. De nombreuses nouveautés en profitent pour faire leur entrée, parmis lesquelles : un moteur de navigation pour les fichiers, classes et méthodes ; de nouvelles fonctions d'autocomplétion ; une barre de recherche refondue ; une meilleure gestion des erreurs, etc. Le design a l...

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  • "Notre système rendra tous les programmes open-source", déclarent des chercheurs de l'Université de

    "Notre système rendra tous les programmes open-source", déclarent des chercheurs de l'Université de Washington Une équipe de chercheurs travaillant à l'Université de Washington a développé un système qui rendrait tous les programmes open source et personnalisables, sans exception. James Fogarty, professeur assistant de sciences de l'informatique, en dévoile plus sur le projet. "Microsoft et Apple n'ouvriront jamais tous leurs produits. Mais toutes leurs créations se traduisent en pixels sur un écran et, si on peut modifier ces pixels, alors on peut changer le comportement visible du programme", explique-t-il. Son approche prévoit de pirater l'apparence pour personnaliser l'interfac...

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  • How to open a MIB file in tkmib?

    - by l0b0
    I've tried to open several MIB files in tkmib without success. For example: $ sudo apt-get install tkmib $ wget http://www.mibsearch.com/vendors/Compaq/download/CPQHLTH-MIB $ tkmib CPQHLTH-MIB Click "walk", then you should get an error message like this: setting opts getaddrinfo: CPQHLTH-MIB No address associated with hostname error:snmp_new_session: Couldn't open SNMP session at /usr/lib/perl5/SNMP.pm line 475. unable to create session at /usr/lib/perl5/SNMP.pm line 547. Tk::Error: Can't call method "getnext" on unblessed reference at /usr/bin/tkmib line 506. main::snmpwalk at /usr/bin/tkmib line 506 Tk callback for .frame5.button2 Tk::__ANON__ at /usr/lib/perl5/Tk.pm line 250 Tk::Button::butUp at /usr/lib/perl5/Tk/Button.pm line 175 <ButtonRelease-1> (command bound to event) As I'm completely new to SNMP and MIB files, and man tkmib is sparse to say the least, what do I actually need to do to be able to work with this file?

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  • Would you make your website's source code public?

    - by Karpie
    Back story: My best friend is a self-taught coder for a community art site, written in PHP. Some time ago he mentioned he wanted to make the source code of the site public, to which my response was total horror - surely it was going to be full of security holes waiting to be found, and it was going to lead to hacking and errors on a huge scale. He never ended up doing it. Current story: I'm starting development of a community website built in Rails, and for ease of use I was going to use Github for version control. Then I realized it was pretty much exactly the same thing as my friend making his source code public - which made me stop and think. Would you make your website's completely-custom source code public? Or is this a case of open source gone too far? (note: I don't think this applies to people who run things like Wordpress. Or does it?)

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  • Google Chrome Won't Open

    - by Mike Strand
    When I try to open Google Chrome from the launcher, nothing seems to happen. (this is a new phenomenon, it used to work). I'm on Ubuntu 13.04. When I try to open via the terminal with either $ google-chrome $ google-chrome --incognito I get, ":FATAL:zygote_host_impl_linux.cc(138)] The SUID sandbox helper binary was found, but is not configured correctly. Rather than run without sandboxing I'm aborting now. You need to make sure that /opt/google/chrome/chrome-sandbox is owned by root and has mode 4755." Any help would be appreciated.

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  • Is making my own copyright licence safe?

    - by abcd
    I've seen various open source libraries (actually I've seen it for assets as well) having a home-baked license in the following manner : SomeGuy's License:1. You can use this code freely in commercial projects and modify it as you wish, but not sell it2. If you want to sell a modified version, drop me an email first, or give credits to me Edit: The above example is ambiguous, so I am giving another one, I want to know if 3 lines of license will hold some ground: SomeGuy's License:1. You can use this code in a commercial project as a 3rd party library2. You can't sell it as a derivative work I know that such license is not polished at all, for example the Creative Commons set of licenses seem to be short, but actually have some large legal stuff underneath it, but I wonder if at least some level of protection can be gained with a hobby license like that ? My question is, could this hold any ground in the court, or would the corporative lawyers of the company X tear it apart ?

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  • php+mysql account management software?

    - by kdavis8
    I need an account system added to my website as a plugin to all of my HTML pages. The account system plugin needs to,register new users, log in current users, remove users who want to disconnect service, and manipulate all of these things via database on my web server. However, I do not know how to program in the PHP language or create and manipulate MySQL databases. I want a program that can create and manipulate the MySQL database automatically for my website and handle also PHP calls automatically. Are there any open source freeware programs out there that i can use? If so what are the names of these freeware?

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