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  • Returning an anonymous class that uses a final primitive. How does it work?

    - by Tim P
    Hi, I was wondering if someone could explain how the following code works: public interface Result { public int getCount(); public List<Thing> getThings(); } class SomeClass { ... public Result getThingResult() { final List<Thing> things = .. populated from something. final int count = 5; return new Result { @Override public int getCount() { return count; } @Override public List<Thing> getThings(); return things; } } } ... } Where do the primitive int , List reference and List instance get stored in memory? It can't be on the stack.. so where? Is there a difference between how references and primitives are handled in this situation? Thanks a bunch, Tim P.

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  • iPhone Internationalization. What is the simplest workflow for me?

    - by dugla
    Hello, I am wising up and getting my internationalization act together. Right off the bat I am a bit swamped by all the docs Apple provides so I was wondering of someone could sketch a workflow for my situation. Before I begin, I browsed some Apple example code and noticed this NIB file - MainWindow.xib - in the Resources folder: This clearly has something to do with internationalization/localization. Could someone please explain how this is created and where in the workflow it happens? My app is fundamentally an imaging app with a few labels that I currently programmatically internationalize using NSLocalizedString(...). If I set all my labels programmatically and wrap all my strings with NSLocalizedString(...) can I completely ignore the NIB issues? Thanks in advance, Doug

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  • User account design and security...

    - by espinet
    Before I begin, I am using Ruby on Rails and the Devise gem for user authentication. Hi, I was doing some research about account security and I found a blog post about the topic awhile ago but I can no longer find it again. I read something about when making a login system you should have 1 model for User, this contains a user's username, encrypted password, and email. You should also have a model for a user's Account. This contains everything else. A User has an Account. I don't know if I'm explaining this correctly since I haven't seen the blog post for several months and I lost my bookmark. Could someone explain how and why I should or shouldn't do this. My application deals with money so I need to cover my bases with security. Thanks.

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  • CSS button not styling

    - by o-logn
    Hey, I must be missing something obvious, but can someone explain what I'm doing wrong with my CSS? I would like all buttons to have a certain format, except a few. I was expecting to use CssClass in order to override the few that should be different, but they all seem to use the standard one. My CSS: .btn { border:none; background-color:red; } input[type="submit"] { border: 2px solid black; background-color:green; } All the buttons take the second value (green background, with a border). However, I have this button: <asp:Button ID="btnAdd" CssClass="btn" runat="server" Text="Add" /> I was expecting this to have no border, and a red background, but it's the same as every other button. Any ideas what I'm doing wrong? Thanks

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  • mysql query performance help

    - by Stefano
    Hi I have a quite large table storing words contained in email messages mysql> explain t_message_words; +----------------+---------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------------+---------+------+-----+---------+----------------+ | mwr_key | int(11) | NO | PRI | NULL | auto_increment | | mwr_message_id | int(11) | NO | MUL | NULL | | | mwr_word_id | int(11) | NO | MUL | NULL | | | mwr_count | int(11) | NO | | 0 | | +----------------+---------+------+-----+---------+----------------+ table contains about 100M rows mwr_message_id is a FK to messages table mwr_word_id is a FK to words table mwr_count is the number of occurrencies of word mwr_word_id in message mwr_message_id To calculate most used words, I use the following query SELECT SUM(mwr_count) AS word_count, mwr_word_id FROM t_message_words GROUP BY mwr_word_id ORDER BY word_count DESC LIMIT 100; that runs almost forever (more than half an hour on the test server) mysql> show processlist; +----+------+----------------+--------+---------+------+----------------------+----------------------------------------------------- | Id | User | Host | db | Command | Time | State | Info +----+------+----------------+--------+---------+------+----------------------+----------------------------------------------------- processlist | 41 | root | localhost:3148 | tst_db | Query | 1955 | Copying to tmp table | SELECT SUM(mwr_count) AS word_count, mwr_word_id FROM t_message_words GROUP BY mwr_word_id | +----+------+----------------+--------+---------+------+----------------------+----------------------------------------------------- 3 rows in set (0.00 sec) Is there anything I can do to "speed up" the query (apart from adding more ram, more cpu, faster disks)? thank you in advance stefano

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  • Alternatives to javascript function-based iteration (e.g. jQuery.each())

    - by Colin
    I've been watching Google Tech Talks' Speed Up Your Javascript and in talking about loops, the speaker mentions to stay away from function-based iterations such as jQuery.each() (among others, at about 24:05 in the video). He briefly explains why to avoid them which makes sense, but admittedly I don't quite understand what an alternative would be. Say, in the case I want to iterate through a column of table cells and use the value to manipulate the adjacent cell's value (just a quick example). Can anyone explain and give an example of an alternative to function-based iteration?

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  • Why are alloc and init called separately in Objective-C?

    - by André Hoffmann
    Note: I'm relatively new to Objective-C and am coming from Java and PHP. Could someone explain to me why I always have to first allocate and then initialize an instance? Couldn't this be done in the init methods like this: + (MyClass*)init { MyClass *instance = [MyClass alloc]; [instance setFoo:@"bla"]; return instance; } + (MyClass*)initWithString:(NSString*)text { MyClass *instance = [MyClass init]; [instance setFoo:text]; return instance; } ... Is this just a relict from the old C days or is there something that I'm not seeing? I know this isn't a problem as I could as well always call alloc and init, but since it's a bit tedious I'd like to at least know why I'm doing it. I'm liking the expressiveness of the language so far, but this is something that I want to fully understand in order to think the Objective-C way. Thank you!

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  • Check if hydrated doctrine result is NULL

    - by iggnition
    Hi, I'm trying to check if a result in my DQL is NULL. I got the following DQL query: $q = self::createQuery("l") ->select('i.*, s.aantal, m.naam, c.cat_naam, a.app_id') ->from('InstalledBase i, i.Spare s, i.Apparaat a, a.Categorie c, a.Merk m') ->execute(); return $q; Now i want to check if the s.aantal is NULL so i do: if(is_null($installedbase->Spare->spare_id)) when the variable is NOT null everything works, but when it is actually NULL i get a E notice message: Notice: Trying to get property of non-object in \installedbase\templates\_index.php on line 29 It does see that it is null though because the if condition is executed. Weird thing is i'm doing the exact same thing on another page where it works no problem. But i must be doing something wrong or stupid since those messages generally don't show for nothing. So can anybody explain this to me? :)

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  • How is conversion of float/double to int handled in printf?

    - by Sandip
    Consider this program int main() { float f = 11.22; double d = 44.55; int i,j; i = f; //cast float to int j = d; //cast double to int printf("i = %d, j = %d, f = %d, d = %d", i,j,f,d); //This prints the following: // i = 11, j = 44, f = -536870912, d = 1076261027 return 0; } Can someone explain why the casting from double/float to int works correctly in the first case, and does not work when done in printf? This program was compiled on gcc-4.1.2 on 32-bit linux machine.

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  • How to Render Partial View into a String

    - by DaveDev
    Hi all, I have the following code: public ActionResult SomeAction() { return new JsonpResult { Data = new { Widget = "some partial html for the widget" } }; } I'd like to modify it so that I could have public ActionResult SomeAction() { // will render HTML that I can pass to the JSONP result to return. var partial = RenderPartial(viewModel); return new JsonpResult { Data = new { Widget = partial } }; } is this possible? Could somebody explain how? note, I edited the question before posting the solution.

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  • Maven copy project output into other project resources

    - by Thomas
    There are two projects: 1) applet project that outputs jar file 2) web app project that should host the jar file. After (1) finished building, the applet jar file should be copied into the webapp folder of (2). The purpose is that (2) will host the applet (1) on the Internet. A lot of examples explain how to use another project as a library dependency. Other examples, show how to use ant plugin to copy files. I am unsure on how to properly set this up, so that 'mvn install' on the parent project will do the copying at the right time.

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  • How to add data manually in core data entity

    - by pankaj
    Hi I am working on core data for the first time. I have just created an entity and attributes for that entity. I want to add some data inside the entity(u can say i want to add data in a table), earlier i when i was using sqlite, i would add data using terminal. But here in core data i am not able to find a place where i can manually add data. I just want to add data in entity and display it in a UITableView. I have gone through the the documentation of core data but it does not explain how to add data manually although it explains how i can add it programmiticaly but i dont need to do it programically. I want to do it manually. Thanks in advance

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  • android: having two listviews in two listactivities didn't work

    - by Yang
    I guess my previous question wasn't clear enough (http://stackoverflow.com/questions/2549585/android-failed-to-setcontentview-when-switching-to-listactivity), so I explain as follows. In my app I have two listactivities which uses two different listviews: public class Activity1 extends ListActivity { @Override public void onCreate(Bundle savedInstanceState) { try{ super.onCreate(savedInstanceState); setContentView(R.layout.listview1); } public class Activity2 extends ListActivity { @Override public void onCreate(Bundle savedInstanceState) { try{ super.onCreate(savedInstanceState); setContentView(R.layout.listview2); } } As required by android, listview must have an ID which is exactly "@android:id/list". If I set the listview in both listview1 and listview2 with the same ID, then they will end up using the same format of listview, which is not what I want. But if I set one of the IDs to be sth like "@+id/listview2", android gave me the error: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list' How do I handle this dilema?

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  • Track pageviews in Google Analytics on partial url of Grails application

    - by Pieter van Gent
    For my Grails application I want to set up Google Analytics to track only "partial" url's. I 'll explain: a typical Grails url consists of the following parts: domain + application-name + controller + action + id e.g. www.mydomain.com/myapp/controller/action/12345 As far as I understand for Google Analytics the page to be tracked is identified by the entire url. For my purpose I'm not interested in the id part of the url: I want to know which actions have been performed, but I need not know for which id the action was executed. And of course I would like a generic solution, because I have multiple controllers and multiple actions... Maybe some kind of filter stating "I want to track pages 3 levels deep (/myapp/controller/action)" would do? Or a filter stating "exclude everything from url after the last /"? Any help would be much appreciated. Kind regards, Pieter

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  • Why would I do an inner join on a non-distinct field?

    - by froadie
    I just came across a query that does an inner join on a non-distinct field. I've never seen this before and I'm a little confused about this usage. Something like: SELECT distinct all, my, stuff FROM myTable INNER JOIN myOtherTable ON myTable.nonDistinctField = myOtherTable.nonDistinctField (WHERE some filters here...) I'm not quite sure what my question is or how to phrase it, or why exactly this confuses me, but I was wondering if anyone could explain why someone would need to do an inner join on a non-distinct field and then select only distinct values...? Is there ever a legitimate use of an inner join on a non-distinct field? What would be the purpose? And if there's is a legitimate reason for such a query, can you give examples of where it would be used?

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  • How to use a DHT for a social trading environment

    - by Lirik
    I'm trying to understand if a DHT can be used to solve a problem I'm working on: I have a trading environment where professional option traders can get an increase in their risk limit by requesting that fellow traders lend them some of their risk limit. The lending trader will can either search for traders with certain risk parameters which are part of every trader's profile, i.e. Greeks, or the lending trader can subscribe to requests from certain traders. I want this environment to be scalable and decentralized, but I don't know how traders can search for specific profile parameters when the data is contained in a DHT. Could anybody explain how this can be done?

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  • How do i use RVM w/ Hudson CI server on Debian?

    - by JoshReedSchramm
    I'm trying to setup an automated "build" server for my rails projects using Hudson CI. SO far it's able to run specs and do metrics on the code but I have 2 different projects dependent on 2 different versions of ruby. So i'm trying to use RVM to run multiple copies of ruby then switch back and forth in a pre-build step. I found a couple posts like this one that try and explain how to make this work, but I'm not running a startup script for hudson, it starts on boot which is how it worked out of the box when i installed it via the debian instructions. The problem seems to be that even though hudson runs under the "hudson" account and that account has rvm installed (and working) when it tries to run a shell based prebuild step to call rvm switch 1.8.7 it fails with the error "rvm: command not found" Not sure what I'm doing wrong. Hudson is using SH as its shell but i also tried using bash. no luck. Has anyone gotten this working before in this setup?

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  • Mac OS X bluetooth programming sample ?

    - by tuttu47
    Hi, I am trying to develop an application using bluetooth in my MAC mini. However, after searching all over net, all that I could find was the "Bluetooth Device Access Guide" from apple, and not a single sample program ! Is any sample code for this available ? I will also explain what I am trying to do in my program, so that if any of you can help me.... I want pair my iPhone with my MAC programmatically over the PAN profile, and then send data (streams) both-ways. I paired them manually, and I was successfully able to transfer data. I just want to do that programmatically ! Any help would be appreciated ...

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  • How to force oracle to use index range scan?

    - by wsb3383
    Hi, all. I have a series of extremely similar queries that I run against a table of 1.4 billion records (with indexes), the only problem is that at least 10% of those queries take 100x more time to execute than others. I ran an explain plan and noticed that the for the fast queries (roughly 90%) Oracle is using an index range scan (on my created), while on the slow one, it's using a full index scan. Is there a way to force Oracle to do a an index range scan? Thanks!

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  • Fixing warning from git

    - by japancheese
    I've been doing a workflow of making a git repository on a remote central repository, cloning that repo on my local dev machine, doing some work, and then pushing the changes back to the same repo on the remote server. However, and I believe this was after an update I did to git recently, after pushing up a change, I'm getting the following warning: Counting objects: 2724, done. Delta compression using up to 2 threads. Compressing objects: 100% (2666/2666), done. Writing objects: 100% (2723/2723), 5.90 MiB | 313 KiB/s, done. Total 2723 (delta 219), reused 0 (delta 0) warning: updating the currently checked out branch; this may cause confusion, as the index and working tree do not reflect changes that are now in HEAD. Can someone explain to me exactly what this warning means, and what I'm doing wrong in my workflow to not receive this warning?

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  • Why LINQ will work this way?

    - by Benny
    public static ArrayList GetStudentAsArrayList() { ArrayList students = new ArrayList { new Student() { RollNumber = 1,Name ="Alex " , Section = 1 ,HostelNumber=1 }, new Student() { RollNumber = 2,Name ="Jonty " , Section = 2 ,HostelNumber=2 }, }; return students; } this doesn't compile: ArrayList is not IEnumerable ArrayList lstStudents = GetStudentAsArrayList(); var res = from r in lstStudents select r; but this will compile: ArrayList lstStudents = GetStudentAsArrayList(); var res = from Student r in lstStudents select r; Can anybody explain? what's the magic here?

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  • Facing Problem with Libxml.rb

    - by Rakesh
    Hi Folks, I downloaded one of the rails app from server and tried running it.I faced an error on migration D:\Radiant\trunkrake db:migrate (in D:/Radiant/trunk) rake aborted! 126: The specified module could not be found. - D:/Radiant/trunk/config/../ven dor/plugins/libxml-ruby/lib/libxml_ruby.so I got the windows version of libxml_ruby.so and tried again. i got the error saying " libxml2.dll " not found.Then i checked the file libxml.rb ..it says the below lines . If running on Windows, then add the current directory to the PATH for the current process so it can find the pre-built libxml2 and iconv2 shared libraries (dlls). Can anybody explain me what actually this mean? Regards Rakesh S

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  • What is going on with the "return fibonacci( number-1 ) + fibonacci( number-2 )"?

    - by user1478598
    I have problem understanding what the return fibonacci( number-1 ) + fibonacci( number-2 ) does in the following program: import sys def fibonacci( number ): if( number <= 2 ): return 1 else: return fibonacci( number-1 ) + fibonacci( number-2 ) The problem is that I can't imagine how this line works: return fibonacci( number-1 ) + fibonacci( number-2 ) Does the both of the "fibonacci( number-1 )" and "fibonacci( number-2 )" being processed at the same time? or the "fibonacci( number-1 )" is the first to be processed and then the second one? I only see that processing both of them would eventually return '1' so the last result I expect to see it is a '1 + 1' = '2' I would appreciate a lot, If someone can elaborately explain the process of its calculation. I think this is a very newb question but I can't really get a picture of its process.

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  • Git pre-receive hook

    - by Ralphz
    Hi When you enable pre-receive hook for git repository: It takes no arguments, but for each ref to be updated it receives on standard input a line of the format: < old-value SP < new-value SP < ref-name LF where < old-value is the old object name stored in the ref, < new-value is the new object name to be stored in the ref and is the full name of the ref. When creating a new ref, < old-value is 40 0. Does anyone can explain me how do I examine all the files that will be changed in the repository if i allow this commit? I'd like to run that files through some scripts to check syntax and so on. Thanks.

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  • overriding protected internal with protected!

    - by Asad Butt
    This is an extension for this question asked an hour ago. We cannot modify the access modifiers, when overriding a virtual method in derived class. Consider Control class in System.Web.UI namespace public class Control : IComponent, IDisposable,... { protected internal virtual void CreateChildControls() { } . . } Now Consider This public class someClass : System.Web.UI.Control { // This should not compile but it does protected override void CreateChildControls() { } // This should compile but it does not protected internal override void CreateChildControls() { } } can any body explain this ? Thanks

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