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  • Why can final object be modified?

    - by Matt McCormick
    I came across the following code in a code base I am working on: public final class ConfigurationService { private static final ConfigurationService INSTANCE = new ConfigurationService(); private List providers; private ConfigurationService() { providers = new ArrayList(); } public static void addProvider(ConfigurationProvider provider) { INSTANCE.providers.add(provider); } ... INSTANCE is declared as final. Why can objects be added to INSTANCE? Shouldn't that invalidate the use of final. (It doesn't). I'm assuming the answer has to do something with pointers and memory but would like to know for sure.

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  • navigateToUrl AS3 is not opening a web browser

    - by Ronnie
    I have a textField on my stage named 'adBuy', which when clicked I want to open up my browser with the defined in URL request. However when I click on the 'adBuy' textField on my SWF it opens Coda, the piece of software I'm using to write this small piece of code? I am puzzled. Here is my code: adBuy.defaultTextFormat = adFormat; adBuy.textColor = 0xFF65CB; adBuy.x = 640; adBuy.y = 455; adBuy.text = "Buy Now"; parent.addChild(adBuy); adBuy.addEventListener(MouseEvent.CLICK, buyAdvert); var request:URLRequest = new URLRequest("http://www.google.co.uk"); function buyAdvert(event:MouseEvent):void { navigateToURL(request, "_blank"); trace("link clicked"); } Is there an error in my code, or is this a common problem for which there is an answer?

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  • How do people prove the correctness of Computer Vision methods?

    - by solvingPuzzles
    I'd like to pose a few abstract questions about computer vision research. I haven't quite been able to answer these questions by searching the web and reading papers. How does someone know whether a computer vision algorithm is correct? How do we define "correct" in the context of computer vision? Do formal proofs play a role in understanding the correctness of computer vision algorithms? A bit of background: I'm about to start my PhD in Computer Science. I enjoy designing fast parallel algorithms and proving the correctness of these algorithms. I've also used OpenCV from some class projects, though I don't have much formal training in computer vision. I've been approached by a potential thesis advisor who works on designing faster and more scalable algorithms for computer vision (e.g. fast image segmentation). I'm trying to understand the common practices in solving computer vision problems.

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  • Linking to an Apache License 2.0 library and distributing with proprietary application

    - by atnakjp
    Hi all, I've read through "Apache License, Version 2.0" but my interpretation was in slightly different to an answer given in a related question so was hoping for some clarification. Supposing I created an application that linked to a library that was licensed under the license in question, my interpretation for doing what's required is: I don't need to do anything special to the application itself because it's considered neither "Work" nor "Derivative Works". When distributing the library alongside the application, I need to include a copy of the license. Any installer that contains the library would be considered "Derivative Works" and therefore I would need to show the attribution notices contained in "NOTICE" (if one exists) in one of its screens. If I were to distribute everything in a zip file instead, I would need to put the same attribution notices in a text file that I distribute alongside the file. Does this sound about right? Cheers,

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  • Workaround for the Mono PrivateFontCollection.AddFontFile bug

    - by CommuSoft
    When I call the PrivateFontCollection.AddFontFile method in Mono.net It always returns a standard font-family. This bug has already been reported on several websites, but as far as I know without a way to solve it. The bug itself isn't fixed in the Mono-libraries yet. Is there any workaround for it? EDIT: As a reaction on henchman's answer I will post the code: PrivateFontCollection pfc = new PrivateFontCollection(); pfc.AddFontFile("myFontFamily.ttf"); myFontFamily = pfc.Families[0x00]; Font myFont = new Font(myFontFamily,14.0f); I know this code will work fine on the Microsoft.Net framework, but when executing on Mono, it just gives a standard font-family (I think it is Arial) with the name of myFontFamily.ttf

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  • How to add a another value to a key in python

    - by Nanowatt
    First I'm sorry this might be a dumb question but I'm trying to self learn python and I can't find the answer to my question. I want to make a phonebook and I need to add an email to an already existing name. That name has already a phone number attached. I have this first code: phonebook = {} phonebook ['ana'] = '12345' phonebook ['maria']= '23456' , '[email protected]' def add_contact(): name = raw_input ("Please enter a name:") number = raw_input ("Please enter a number:") phonebook[name] = number Then I wanted to add an email to the name "ana" for example: ana: 12345, [email protected]. I created this code but instead of addend a new value (the email), it just changes the old one, removing the number: def add_email(): name = raw_input("Please enter a name:") email = raw_input("Please enter an email:") phonebook[name] = email I tried .append() too but it didn't work. Can you help me? And I'm sorry if the code is bad, I'm just trying to learn and I'm a bit noob yet :)

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  • Create a helper or something for haml with ruby on rails

    - by Lisinge
    Hello, i am using haml with my rails application and i have a question how the easiest way to insert this haml code into a html file: <div clas="holder"> <div class=top"></div> <div class="content"> Content into the div goes here </div> <div class="bottom"></div> </div> And i want to use it in my haml document like this: %html %head %body Maybee some content here. %content_box #I want to get the code i wrote inserted here Content that goes in the content_box like news or stuff %body I hope you understand what i want to acomplish here. And if there is a easier way to do it please answer how. Thanks!

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  • .Net friendly, local, key-value pair, replicatable datastore

    - by Brad Mathews
    I am looking for a key/value type datastore with very specific requirements. Anyone know anything that will work? Needs to be a component of some sort. No additional installation needed. The datastore needs to be on the local hard drive. I am using VB.Net for a desktop app running Windows XP through 7 so it needs to callable by that environment. It needs to replicatable. If I have four copies of my app running on the network, each local copy of the datastore needs to replicate with the others. As close to real time as possible. The first three are easy, I can do that with ADO.Net out of the box. The last one, replication, is the one I do not have answer to. Does such an animal exist? Thanks, Brad

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  • How to show/open/bringToFront a Window that is inside the MainMenu.xib File?

    - by 0SX
    This is a stupid question that I should be able to answer myself but I can't seem to get it to work. I have a window inside my MainMenu.xib file that I want to show or bring to front. Right now I have it visible at launch and it works but if I close it with orderOut: and do another instance of it, buttons quit working. How can I reopen the same window that the NSApplication launched at the beginning of the app? I've spent 2+ days trying to figure a way to make it work but no luck. I've even tried to split the window out to it's own xib file but when I do that my methods from the appDelegate fail to respond/work. Any help would be much appreciated. I feel stupid for even asking such a simplistic question. lol Thanks.

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  • Acquiring Table Lock in Database - Interview Question

    - by harigm
    One of my interview Questions, if multiple users across the world are accessing the application, in which it uses a Table which has a Primary Key as Auto Increment Field. The Question how can you prevent the other user getting the Same Primary key when the other user is executing? My answer was I will obtain the Lock on the table and I will make the user to wait Until that user is released with the Primary key. But the Question How do you acquire the Table lock programmatically and implement this? If there are 1000 users coming every minute to the application, if you explicity hold the lock on the table, then the application will become slower? How do you manage this? Please suggest the possible answers for the above question

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  • Real time web services

    - by daliz
    Hi everybody, I have a little (maybe the answer could require a book) question about web services and server side programming. But first, a little preamble. Recently we have seen new kind of applications & games using some kind of real-time interaction with a database, or more generally, with other users. I'm talking about shared drawing canvas, games like this , or simple chats, or the Android app "a World of Photo", where in real time you see who is online, to share your photos, etc. Now my question: Are all these apps based on classic TCP client/server architectures or is there a way to make them in a simpler way, like a web platform like LAMP? What I'm asking, in other words is: Can PHP+MySQL (or JSP, or RoR, or any other server language) provide a way to make online users communicate in real time and share data? Is there a way to do that without the ugly and heavy mechanism of temporary tables? Thank you! I hope I've been clear.

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  • Operating system for visualization app in 6 monitors

    - by Federico
    Hi. I have to plan the development for an application with these major requirements: Show different graphical data and animations in 6 monitors, in fullscreen mode. The hardware to be used is a PC with 3 NVIDIA GeForce 9800 GX2 cards. I have some expertise working with OpenGL, but never with more than one monitor. I have the (some limited) freedom to choose an operating system for the application. My options are: Windows XP, Windows Vista, Windows 7, Ubuntu 8.04/10.04. I would like to know, if you have some expertise or knowledge in the multi-monitor application development field, what is the recommended operating system for this kind of application? And, do I need any software other than the operating system and the NVIDIA drivers to be able to use the 6 monitors in fullscreen, showing different things in each one of them? Any comment/answer will be really appreciated. Thanks in advance! Federico

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  • Get children count via HQL

    - by Thomas Lötzer
    Hi, I have a one-to-many mapping between a parent entity and child entities. Now I need to find the number of children associated with each parent for a list of parents. I am trying to do this with HQL but I am not sure how I can get the list of parents in there. Also, I don't know how I can return the entity itself and not just its ID. My current HQL query is: select new map(parent.id as parentId, count(*) as childCount) from Parent parent left join parent.children children group by parent.id but this only returns the ID and does not filter on specific parents. EDIT Based on Pascal's answer I have modified the query to select new map(parent as parent, count(elements(parent.children)) as childCount) from Parent parent group by parent That does work, but is prohibitively slow: 30 seconds instead of 400 ms on the same database.

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  • A regex for version number parsing

    - by ajborley
    Hi, I have a version number of the following form: version.release.modification where version, release and modification are either a set of digits or the '*' wildcard character. Additionally, any of these numbers (and any preceding .) may be missing. So the following are valid and parse as: 1.23.456 = version 1, release 23, modification 456 1.23 = version 1, release 23, any modification 1.23.* = version 1, release 23, any modification 1.* = version 1, any release, any modification 1 = version 1, any release, any modification * = any version, any release, any modification But these are not valid: *.12 *123.1 12* 12.*.34 Can anyone provide me a not-too-complex regex to validate and retrieve the release, version and modification numbers? Many thanks! Thanks for all the responses! This is ace :) Based on OneByOne's answer (which looked the simplest to me), I added some non-capturing groups (the '(?:' parts - thanks to VonC for introducing me to non-capturing groups!), so the groups that do capture only contain the digits or * character. ^(?:(\d+)\.)?(?:(\d+)\.)?(\*|\d+)$ Many thanks to everyone!

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  • Wordpress: Create a customized role / user

    - by Mestika
    Hi, I’m farely new to Wordpress but are working on putting a page together which has a very simple purpose. I’m creating it for a customer with little or none IT experience so I want to create a user he can use to login and edit his pages – and nothing more. No settings, no comments, no posts, no links, no nothing, just create, delete and edit pages and maybe edit his own profile or at least his E-mail and password. I can see that wordpress has some predefined roles for users but none of them completely does what I want and they either has to little or to many rights. I’ve been looking at the wordpress page http://codex.wordpress.org/Roles_and_Capabilities but can’t seem to get a clear answer. Is it in any way possible for me to create my own user role (e.g. customer) where I can set the rights I want for him? Thanks Sincerely Mestika

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  • What programming technique / practice done by you was ahead of its time?

    - by Binoj Antony
    I once built a very good web application in ASP (classic) back in 2001 and extensively used XmlHttpRequest object in it. (I was lucky that the clients were only using IE, and only IE supported this object at that time). Then later when people started talking about AJAX in 2005, It felt good to have used something ahead (or early) of its time. Well, maybe this does not qualify to be listed as something done ahead of its time. Which programming technology/technique/practice have you done that was ahead of this time. One story per answer please. The title for this question taken from an opposite question here.

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  • LIKE operator with $variable

    - by skarama
    This is my first question here and I hope it is simple enough to get a quick answer! Basically, I have the following code: $variable = curPageURL(); $query = 'SELECT * FROM `tablename` WHERE `columnname` LIKE '$variable' ; If I echo the $variable, it prints the current page's url( which is a javascript on my page) Ultimately, what I want, is to be able to make a search for which the search-term is the current page's url, with wildcards before and after. I am not sure if this is possible at all, or if I simply have a syntax error, because I get no errors, simply no result! I tried : $query = 'SELECT * FROM `tablename` WHERE `columnname` LIKE '"echo $variable" ' ; But again, I'm probably missing or using a misplaced ' " ; etc. Please tell me what I'm doing wrong!

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  • Mysql SELECT nested query, very complicated?

    - by smartbear
    Okay, first following are my tables: Table house: id | items_id | 1 | 1,5,10,20 | Table items: id | room_name | refer 1 | kitchen | 3 5 | room1 | 10 Table kitchen: id | detail_name | refer 3 | spoon | 4 5 | fork | 10 Table spoon: id | name | color | price | quantity_available | 4 | spoon_a | white | 50 | 100 | 5 | spoon_b | black | 30 | 200 | How to do a nested select statement, where I want to select id, name, color, price and quantity_available column, from the each value inside the 'items_id' column in 'house' table? This is very challenging!! EDIT: after read robin's answer Table house: id | items_id | house1 | 1 | house1 | 5 | house1 | 10 | house2 | 20 | If this it the house table, how to do the nested, join, or whatever select statement??

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  • Processing incoming email

    - by Mike Schots
    How do I programmatically read an incoming email with .NET. I need a method to take the content of email message (in this case XML) on a POP server and read it into my application. Ideally this could be solved by: .NET code that I can run as a background task on my webserver to process the email. A service that can POST the contents of the email to my webserver. Although I'm open to other options. EDIT: Copied from the "non-answer": Currently, we're looking at using the email accounts our hosting company provides. Our own mail server could potentially be an option, but its something the we'd need to contact the host about.

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  • Calculating Percentiles (Ruby).

    - by zxcvbnm
    My code is based on the methods described here and here. def fraction?(number) number - number.truncate end def percentile(param_array, percentage) another_array = param_array.to_a.sort r = percentage.to_f * (param_array.size.to_f - 1) + 1 if r <= 1 then return another_array[0] elsif r >= another_array.size then return another_array[another_array.size - 1] end ir = r.truncate another_array[ir] + fraction?((another_array[ir].to_f - another_array[ir - 1].to_f).abs) end Example usage: test_array = [95.1772, 95.1567, 95.1937, 95.1959, 95.1442, 95.061, 95.1591, 95.1195, 95.1065, 95.0925, 95.199, 95.1682] test_values = [0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0] test_values.each do |value| puts value.to_s + ": " + percentile(test_array, value).to_s end Output: 0.0: 95.061 0.1: 95.1205 0.2: 95.1325 0.3: 95.1689 0.4: 95.1692 0.5: 95.1615 0.6: 95.1773 0.7: 95.1862 0.8: 95.2102 0.9: 95.1981 1.0: 95.199 The problem here is that the 80th percentile is higher than the 90th and the 100th. However, as far as I can tell my implementation is as described, and it returns the right answer for the example given (0.9). Is there an error in my code I'm not seeing? Or is there a better way to do this?

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  • How to set the base path in IIS 7 hosting a WCF application?

    - by curiouscoder
    I've been fighting my way through the process of migrating a (previously self-hosted) WCF application to IIS7 (I've never used IIS before and I realise that this is a very simplistic question but I failed to google/SO the answer so far). My service is hosted at http://xxx.xxx.xxx.xxx/SampleWebsite/Service.svc but when I access it with ?wsdl all the references that should read http://xxx.xxx.xxx.xxx/ are actually set to the window machine's local network name (i.e. http://localpc3/). I've tried using the WCF tool to add the external IP address to the base address section under the service I'm configuring as well as a number of setting inside IIS but I can't seem to track down the correct place. Where do I set this? IIS manager, web.config, somewhere else?

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  • Windows Media Center 6 Development on Vista

    - by Clever Human
    I have two development machines -- one is Windows 7, the other is Windows Vista. Depending on where I am in my house is which machine I use. I am writing a Windows Media Center 6 (which ships as part of Windows 7) application. I installed the WMC6 SDK on my Windows 7 machine with no issues. However, when I try and install it on my Vista machine, I am told the WMC6 SDK cannot be installed on Vista. So my questions are: How can I develop a WMC6 app on Vista? If I use the Vista version of the SDK (WMC5.3 SDK) will I be able to edit / compile and test the same application from each machine. I imagine the answer to the second question is "no" because the API changed between those two versions. So can I only work on this application from my Windows 7 machine? That really sucks if it is true!

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  • C String literals: Where do they go?

    - by Chris Cooper
    I have read a lot of posts about "string literals" on SO, most of which have been about best-practices, or where the literal is NOT located in memory. I am interested in where the string DOES get allocated/stored, etc. I did find one intriguing answer here, saying: Defining a string inline actually embeds the data in the program itself and cannot be changed (some compilers allow this by a smart trick, don't bother). but, it had to do with C++, not to mention that it says not to bother. I am bothering. =D So my question is, again, where and how is my string literal kept? Why should I not try to alter it? Does the implementation vary by platform? Does anyone care to elaborate on the "smart trick?" Thanks for any explanations.

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  • Silverlight 4 Out-of-browser application into the browser ?

    - by Niklaos
    Hi guys, I just lost 5 hours looking for a answer which i haven't been able to find :p First, I'd like to force a trusted application (i need to access the file system) to display into the browser. Based on what i found on google a trusted application must be installed and launched as a desktop application (also called out-of-browser application). So, i want to have an installed application on the client side but meanwhile, the user must also be able to start this same application into a browser window when he goes on my web site. Is this possible ? Second, I'd like to give to the user the possibility to start the application from the browser. To be clear be the application is installed on the client computer but i want a button on my web site which starts the desktop application. How can i do that ? Thanks

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  • iPhone App Minus App Store?

    - by Dan Walker
    I've been looking into iPhone development, but I've been having problems coming up with the answer to a certain question. If I create an application on my Mac, is there any way I can get it to run on an iPhone without going through the app store? It doesn't matter if the iPhone has to be jailbroken, as long as I can still run an application created using the official SDK. For reasons I won't get into, I can't have this program going through the app store. Thanks for any help you can give!

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