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• Sorting Table Cells based on data from NSArray

  - by Graeme

  Hi, I have an NSArray which contains information from an RSS feed on dogs, such as [dog types], [dog age] and [dog size]. At the moment my UITableView simply displays each cell on each dog and within the cell lists [dog types], [dog age] and [dog size]. I want to be able to allow users of my app to "sort" this data based on the dog name, dog size or dog age when they press a UIButton in the top nav-bar. I'm struggling to work out how to filter the UITableView based on these factors, so any help is appreciated. Thanks.

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• Easiest way to merge a changed list to the master list

  - by Kiran Chandrashekhar

  I have a two lists of class object : private List<IntVector> UserData = new List<IntVector>(); private List<IntVector> EditData = new List<IntVector>(); UserData is the Master List and EditData is another list which would be used to add, delete, or modify the list. One of the class memeber is CaseNo which would not change for an IntVector. I have made changes in the EditData and would like to merge the changes to the UserData. Any idea how to do it ?

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• How to normalize a URL in Java?

  - by dfrankow

  URL normalization (or URL canonicalization) is the process by which URLs are modified and standardized in a consistent manner. The goal of the normalization process is to transform a URL into a normalized or canonical URL so it is possible to determine if two syntactically different URLs are equivalent. Strategies include lowercasing, adding trailing slashes, https = http, etc. The Wikipedia page lists many. Got a favorite method of doing this in Java? Perhaps a library (Nutch?), but I'm open. Smaller and fewer dependencies is better. I'll handcode something for now and keep an eye on this question.

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• How to gradient fill a button's background?

  - by Samuh

  I have to create a colored button with gradient fill(starting from the middle of the button along Y axis). If I set the background property of the button to the color I want, I lose the rounded look and feel of a button and also the gradient fill(It looks like a TextView with a background). Also, I want this color to change when the user depresses the button. Can i specify this via selector XMLs(Color State Lists)? Any tutorials or links that can help me here is appreciated. Thanks.

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• What should I call a class that contains a sequence of states

  - by Robert P

  I have a GUI tool that manages state sequences. One component is a class that contains a set of states, your typical DFA state machine. For now, I'll call this a StateSet. However, I have another class that has a collection (possibly partially unordered) of those state sets, and lists them in a particular order. and I'm trying to come up with a good name for it - not just for internal code, but for customers to refer to it. I've got: Sequence (maybe) StateSetSet (reasonable for code, but not for customers) Any other suggestions or ideas?

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• What is the best way to save the environment from before an alarm handler goes off when the alarm do

  - by EpsilonVector

  I'm trying to implement user threads on a 2.4 Linux kernel (homework) and the trick for context switch seems to be using an alarm that goes off every x milliseconds and sends us to an alarm handler from which we can longjmp to the next thread. What I'm having difficulties with is figuring out how to save the environment to return to later. Basically I have an array of jmp_buffs, and every time a "context switch" using the alarm happens I want to save the previous context to the appropriate entry of the array and longjmp to the next one. However, just the fact that I need to do this from the event handler means that just using setjmp in the event handler won't give me exactly the kind of environment I want (as far as stack and program counter are involved) because the stack has the event handler call in it and the pc is in the event handler. I suppose I can look at the stack and alter it to fit my needs, but that feels a bit cumbersome. Another idea I had is to somehow pass the environment before the jump to event handler as a parameter to the event handler, but I can't figure out if this is possible. So I guess my question is- how do I do this right?

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• What is .htaccess RewriteRule best practice?

  - by Pablo

  Is it better to have a single RewriteRule with a bunch of RegEx or multiples Rules with fewer RegEx for the server to query? Will there be any performance differences? Heres is an example a single rule with almost all RegEx groups as optional: RewriteRule ^gallery/?([\w]+)?/?([\w]+)?/?([\d]+)?/?([\w]+)/?$ /gallery.php?$1=$2&start=$3&by=$4 [NC] Here are some of the rules lists that would replace the one above: RewriteRule ^gallery/category/([\w]+)/$ /gallery.php?category=$1& [NC] RewriteRule ^gallery/category/([\w]+)/([\d]+)/$ /gallery.php?category=$1&start=$2 [NC] RewriteRule ^gallery/category/([\w]+)/([\d]+)/([\w]+)/$ /gallery.php?category=$1&start=$2&by=$3 [NC] ... RewriteRule ^gallery/tag/([\w]+)/$ /gallery.php?category=$1& [NC] RewriteRule ^gallery/tag/([\w]+)/([\d]+)/$ /gallery.php?category=$1&start=$2 [NC] RewriteRule ^gallery/tag/([\w]+)/([\d]+)/([\w]+)/$ /gallery.php?category=$1&start=$2&by=$3 [NC] ... I'll be glad to hear your options or personal experiences.

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• Finding a sequence in a List

  - by user113164

  I have a list of integers that I would like to search for a sequence. For example, if i have a master list: 1, 2, 3, 4, 9, 2, 39, 482, 19283, 19, 23, 1, 29 And I want to find sequence: 1, 2, 3, 4 I would like some easy way to fill a subset list with: 1, 2, 3, 4 + the next five integers in the master list And then remove the integers in the subset list from the master list so at the end of the operation, my lists would look like this: Master list: 19, 23, 1, 29 Subset list: 1, 2, 3, 4, 9, 2, 39, 482, 19283 Hope that makes sense. I'm guessing maybe linq would be good for something like this, but I've never used it before. Can anyone help?

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• C# BinarySearch breaks when inheriting from something that implements IComparable<T>?

  - by Ender

  In .NET the BinarySearch algorithm (in Lists, Arrays, etc.) appears to fail if the items you are trying to search inherit from an IComparable instead of implementing it directly: List<B> foo = new List<B>(); // B inherits from A, which implements IComparable<A> foo.Add(new B()); foo.BinarySearch(new B()); // InvalidOperationException, "Failed to compare two elements in the array." Where: public abstract class A : IComparable<A> { public int x; public int CompareTo(A other) { return x.CompareTo(other.x); } } public class B : A {} Is there a way around this? Implementing CompareTo(B other) in class B doesn't seem to work.

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• How to use Zend Cache with SimpleXML objects?

  - by Jeremy Hicks

  I'm trying to cache the user timeline of a Twitter feed using Zend_Service_Twitter which returns its results as a SimpleXML object. Unfortunately the regular serialize functions (which Zend Cache uses) don't play nice with SimpleXMl objects. I found this http://www.mail-archive.com/[email protected]/msg18133.html. So it looks like I'll need to create some kind of custom frontend for Zend Cache to be able to change the serialize function used. Anybody ever done this already or can point me where to look to start?

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• LINQ Join 2 List<T>s

  - by David Murdoch

  Preface: I don't understand what this does: o => o.ID, i => i.ID, (o, id) => o So go easy on me. :-) I have 2 lists that I need to join together: // contains ALL contacts for a customer. // Each item has a unique ID. // There are no duplicates. ContactCollection list1 = myCustomer.GetContacts(); // contains the customer contacts (in list1) relevant to a REPORT // the items in this list may have properties that differ from those in list1. /*****/// e.g.: /*****/ bool SelectedForNotification; /*****/// may be different. ContactCollection list2 = myReport.GetContacts(); I need to create a third ContactCollection that contains all of the contacts in list1 but with the properties of the items in list2, if they are there (list3.Count == list1.Count). I feel as though I'm not making any sense. So, please ask questions in the comments and I'll try to clarify.

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• Customizing error handling of JAXB unmarshall process

  - by ekeren

  Assuming I have a schema that describes a root element class Root that contains a List<Entry> where the Entry class has a required field name. Here is how it looks in code: @XmlRootElement class Root{ @XmlElement(name="entry") public List<Entry> entries = Lists.newArrayList(); } @XmlRootElement class Entry{ @XmlElement(name="name",required=true) public String name; } If I supply the following XML for unmarshalling: <root> <entry> <name>ekeren</name> </entry> <entry> </entry> </root> I have a problem because the second entry does not contain a name. So unmarshall produces null. Is there a way to customize JAXB to unmarshall a Root object that will only contain the "good" entry?

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• Recommendations for an in memory database vs thread safe data structures

  - by yx

  TLDR: What are the pros/cons of using an in-memory database vs locks and concurrent data structures? I am currently working on an application that has many (possibly remote) displays that collect live data from multiple data sources and renders them on screen in real time. One of the other developers have suggested the use of an in memory database instead of doing it the standard way our other systems behaves, which is to use concurrent hashmaps, queues, arrays, and other objects to store the graphical objects and handling them safely with locks if necessary. His argument is that the DB will lessen the need to worry about concurrency since it will handle read/write locks automatically, and also the DB will offer an easier way to structure the data into as many tables as we need instead of having create hashmaps of hashmaps of lists, etc and keeping track of it all. I do not have much DB experience myself so I am asking fellow SO users what experiences they have had and what are the pros & cons of inserting the DB into the system?

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• How can I diff against a revision of a single file using only the default Git GUI tools?

  - by Rich

  I want to view the history of a single file, and then compare a single revision from that history against the current version. On the command line, this is easy: Run: git log -- <filename> Locate the version you want to compare, Run: git diff <commitid> -- <filename> But how can this be done using only the default Git gui tools, git gui and gitk? I know of two methods using gitk, but they're both horribly clunky: Either: Select the New View option from the View menu, Type in the full path to your file into the box labelled Enter files and directories to include, one per line, Locate the version you want to compare by looking at the highlighted items in the top pane, and click on it to select it, Right-click on the current version and select Diff selected - this, Or: Select Tree in the bottom right-hand pane, Locate the file you want to look at, right-click on it, and select Highlight this only, Locate the version you want to compare by looking at the highlighted items in the top pane, and click on it to select it, Right-click on the current version and select Diff selected - this, Click on the file in the bottom right-hand pane to jump to it in the diff output, or scroll manually. Is a better method than this?

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• Many to Many DataSet Insert to Database using Stored Procedures

  - by Jonn

  I'm trying to do a many-to-many bulk insert to the database using a list of three different types of models. The only tools I can use are stored procedures and datasets. (But I can't use DataSet fills or DataAdapters, just plain ol' Stored Procedures). Is there an easy way to pass multiple values, let alone, pass three different lists and bulk insert them to a table in the database using stored procedures? (As specified in the title, the three tables are actually two tables and a third table to establish the many-to-many relationship between the two.)

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• Errors when creating a custom Querable object with MVC and Subsonic pagedlist

  - by minus4

  hiya, i have the following code but when i try and create a new IQuerable i get an error that the interface cannot be implemented, if i take away the new i get a not implemented exception, have had to jump back and work on some old ASP classic sites for past month and for the life of me i can not wake my brain up into C# mode. Could you please have a look at below and give me some clues on where i'm going wrong: The code is to create a list of priceItems, but instead of a categoryID (int) i am going to be showing the name as string. public ActionResult ViewPriceItems(int? page) { var crm = 0; page = GetPage(page); // try and create items2 IQueryable<ViewPriceItemsModel> items2 = new IQueryable<ViewPriceItemsModel>(); // the data to be paged,but unmodified var olditems = PriceItem.All().OrderBy(x => x.PriceItemID); foreach (var item in olditems) { // set category as the name not the ID for easier reading items2.Concat(new [] {new ViewPriceItemsModel {ID = item.PriceItemID, Name = item.PriceItem_Name, Category = PriceCategory.SingleOrDefault( x => x.PriceCategoryID == item.PriceItem_PriceCategory_ID).PriceCategory_Name, Display = item.PriceItems_DisplayMethod}}); } crm = olditems.Count() / MaxResultsPerPage; ViewData["numtpages"] = crm; ViewData["curtpage"] = page + 1; // return a paged result set return View(new PagedList<ViewPriceItemsModel>(items2, page ?? 0, MaxResultsPerPage)); } many thanks

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• adding an element to a list in lisp

  - by user272483

  i'm using r5rs and i just want to implement a function that returns the intersection of two given lists but i can't do that because i can npot add element to a list. here is my code. how can i fix it? i'm really a beginner in lisp, this is my first work on lisp? thx in advance.. (define list3 '()) (define (E7 list1 list2) (cond ((null? list1) list3) ((member (car list1) list2) (append list3 (list (car list1)))) ) (cond ((null? list1) list3) ((not(null? list1)) (E7 (cdr list1) list2) ) ) ) (E7 '(4 5) '(3 4))

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• XNA Music mixing real-time

  - by Adam L. S.

  I've created a "format" to store segments of music (prelude part, repeated part, ending part) and time information for these segments (offset, scored length) so I can mix it up in real-time as if it were one piece of music, while repeating the repeated part (optionally) indefinitely. This way, the segments can store decay where the next segment is played, while the previous one is finished. (I've created a player for this in Java, and used the Clip class.) I wanted this format, so I can provide a finite length music (for a jukebox feature), while I play infinite length music in-games. However, when I wanted to code a class in XNA that manages this "format" I've noticed, that there is no obvious way to play "Songs" simultaneously/overlapped. How can I do this/what is the best practice, not leaving the XNA framework? (I don't want to create infinite play-lists.)

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• How to implement arrays in an interpreter?

  - by Ray

  I have managed to write several interpreters including Tokenizing Parsing, including more complicated expressions such as ((x+y)*z)/2 Building bytecode from syntax trees Actual bytecode execution What I didn't manage: Implementation of dictionaries/lists/arrays. I always got stuck with getting multiple values into one variable. My value structure (used for all values passed around, including variables) looks like this, for example: class Value { public: ValueType type; int integerValue; string stringValue; } Works fine with integers and strings, but how could I implement arrays? (From now on with array I mean arrays in my experimental language, not in C++) How can I fit the array concept into the Value class above? Is it possible? How should I make arrays able to be passed around just as you could pass around integers and strings in my language, using the class above? Accessing array elements or memory allocation wouldn't be the problem, I just don't know how to store them.

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• Give me a practical use-case of Multi-set

  - by Calm Storm

  I would like to know a few practical use-cases (if they are not related/tied to any programming language it will be better).I can associate Sets, Lists and Maps to practical use cases. For example if you wanted a glossary of a book where terms that you want are listed alphabetically and a location/page number is the value, you would use the collection TreeMap(OrderedMap which is a Map) Somehow, I can't associate MultiSets with any "practical" usecase. Does someone know of any uses? http://en.wikipedia.org/wiki/Multiset does not tell me enough :) PS: If you guys think this should be community-wiki'ed it is okay. The only reason I did not do it was "There is a clear objective way to answer this question".

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• SharePoint filtered column that only allows item to be used once

  - by Jason

  I have a WSS 3.0 site that I use for change management. There are three primary lists on it -- a bug list, an enhancement list, and a release list. The release list has two lookup columns that provide a list of bugs and enhancements that are included in that particular release. I am trying to figure out how to filter the bug and enhancement list to include only items that have not already been included in another release. All the docs and examples I have seen regarding filtered lookups deal with a query on the list itself. For my situation, and if this was a SQL query, I would need to use a LEFT JOIN to generate the list.

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• The best way to assign an immutable instance to a Collection in Java

  - by Ali

  Today I was reading through some Hibernate code and I encounter something interesting. There is a class called CollectionHelper that defines the following constant varibale: public final class CollectionHelper { public static final List EMPTY_LIST = Collections.unmodifiableList( new ArrayList(0 ) ; public static final Collection EMPTY_COLLECTION = Collections.unmodifiableCollection(new ArrayList(0) ); public static final Map EMPTY_MAP = Collections.unmodifiableMap( new HashMap(0) ); They have used these constants to initialize collections with immutable instances. Why they didn't simply use the Collections.EMPTY_LIST for initializing lists? Is there a benefit in using the following method?

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• Trouble getting Flash socket policy file to work.

  - by Alex

  Basically I'm using Flash to connect to a Java server. Despite my Java application replying to the , in the Flash debug log it lists (not sure about the order as there are lots): * Security Sandbox Violation * Connection to 192.168.1.86:4049 halted - not permitted from http://127.0.0.1:8888/Current/wander.swf Warning: Timeout on xmlsocket://192.168.1.86:4049 (at 3 seconds) while waiting for socket policy file. This should not cause any problems, but see http://www.adobe.com/go/strict_policy_files for an explanation. Error: Request for resource at xmlsocket://192.168.1.86:4049 by requestor from http://127.0.0.1:8888/Current/wander.swf is denied due to lack of policy file permissions. What I don't understand is, the server (port 4049) receives the request, outputs the policy file and then closes the connection, surely it shouldn't time out? The policy file I'm using is: <?xml version="1.0"?> <cross-domain-policy><allow-access-from domain="*" to-ports="*" /> </cross-domain-policy>

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• most popular j2ee based websites

  - by krishna

  J2EE as I understand is used to build Enterprise applications. My question is :What are the most popular public facing(internet) sites using j2ee stack. The one's that I know of are : linkedIn.com ,evite.com and sun ibm and oracle (obviously) Eclipse.org uses php, I wonder why? If you have worked on/know any other sites, can your share your experience and also the technologies used(if that's not an issue)? EDIT:It doesn't have to use the full stack. EDIT : There are quite a few ecommerce websites like bestbuy.com. I know this bcos I worked with the ATG(atg.com) ecommerce suite and their website lists their clients. Iam looking for those kind of examples and also your experience working on them. Please limit to only internet sites

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• Indentation control while developing a small python like language

  - by sap

  Hello, I'm developing a small python like language using flex, byacc (for lexical and parsing) and C++, but i have a few questions regarding scope control. just as python it uses white spaces (or tabs) for indentation, not only that but i want to implement index breaking like for instance if you type "break 2" inside a while loop that's inside another while loop it would not only break from the last one but from the first loop as well (hence the number 2 after break) and so on. example: while 1 while 1 break 2 'hello world'!! #will never reach this. "!!" outputs with a newline end 'hello world again'!! #also will never reach this. again "!!" used for cout end #after break 2 it would jump right here but since I don't have an "anti" tab character to check when a scope ends (like C for example i would just use the '}' char) i was wondering if this method would the the best: I would define a global variable, like "int tabIndex" on my yacc file that i would access in my lex file using extern. then every time i find a tab character on my lex file i would increment that variable by 1. when parsing on my yacc file if i find a "break" keyword i would decrement by the amount typed after it from the tabIndex variable, and when i reach and EOF after compiling and i get a tabIndex != 0 i would output compilation error. now the problem is, whats the best way to see if the indentation got reduced, should i read \b (backspace) chars from lex and then reduce the tabIndex variable (when the user doesn't use break)? another method to achieve this? also just another small question, i want every executable to have its starting point on the function called start() should i hardcode this onto my yacc file? sorry for the long question any help is greatly appreciated. also if someone can provide an yacc file for python would be nice as a guideline (tried looking on Google and had no luck). thanks in advance.

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