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  • singleton vs factory?

    - by fayer
    i've got 3 Log classes that all implements iLog interface: DatabaseLog FileLog ScreenLog there can only be one instance of them. initially i though of using single pattern for each class but then i thought why not use a factory for instantiation instead, cause then i wont have to create single pattern for each one of them and for all future Log classes. and maybe someone would want them as multiple objects in the future. so my questions is: should i use factory or singleton pattern here?

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  • stdout and stderr character encoding

    - by Muhammad alaa
    i working on a c++ string library that have main 4 classes that deals with ASCII, UTF8, UTF16, UTF32 strings, every class has Print function that format an input string and print the result to stdout or stderr. my problem is i don't know what is the default character encoding for those streams. for now my classes work in windows, later i'll add support for mac and linux so if you know anything about those stream encoding i'll appreciate it. thank you.

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  • Jython and python modules

    - by Geo
    I've just started using the PythonInterpreter from within my Java classes, and it works great! However, if I try to include python modules (re, HTMLParser, etc.), I'm receiving the following exception (for re): Exception in thread "main" Traceback (innermost last): File "", line 1, in ? ImportError: no module named re How could I make the classes from the jython jar "see" the modules python has available?

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  • Function doesn't work, but it must work

    - by Artem
    private void Main_OnLayoutUpdated(object sender, EventArgs e) { label1.Content = Classes.Global.X.ToString(); Classes.Global.PositionChanged(this); } PositionChanged writes to X new x-position of window. It works, but as soon as I delete label1 it stops working. No errors.

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  • Best way to manipulate XML in .NET

    - by Juan Manuel Formoso
    I need to manipulate an existing XML document, and create a new one from it, removing a few nodes and attributes, and perhaps adding new ones, what would be the best group of classes to accomplish this? There are a lot of .NET classes for XML manipulation, and I'm not sure what would be the optimal way to do it.

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  • GWT 1.4 TO 2.0 UiBinder

    - by manu sinha
    Hi I am upgrading a project with around 60 java classes, from 1.4 to 2.0 . Apart from replacing deprecated functions, adding generics, will converting the whole project into UI Binder approach i.e. XML and Corresponding working Java classes, be recommended. Or shall i go on adding new UI requirments using Ui Binder and leaving the existing code as it is?

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  • Connecting to two databases

    - by Pankaj Khurana
    Hi, I have an application in which i want to authenticate a user from a first database & manage other activities from another database. I have created two classes.An object of the classes is defined in a file $objdb1=new db1(),$objdb2=new db2(); But when i try to call $objdb1-fn(). It searches from the $objdb2 & is showing table1 doesnot exists? Can you help me on this? Regards, Pankaj

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  • Ndepend CQL to find methods of certain types using particular framework assembly

    - by icelava
    In order to check if types not derived from certain base classes are using a low-level framework assembly, the following query can be used. SELECT TYPES WHERE IsDirectlyUsing "ASSEMBLY:Framework.Data" AND !(DeriveFrom "App.BaseTypes.BusinessFacadeBase" OR DeriveFrom "App.BaseTypes.BusinessComponentBase" OR DeriveFrom "App.BaseTypes.DataAccessComponentBase") Now I wish to drill down further to see which methods from those classes are actually doing so. But the thing is if I change the query target from TYPES to METHODS then DeriveFrom is not going to apply. How can these criteria be preserved?

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  • Automated testing in Android development

    - by Sara
    I have an ordinary project with JUnit tests that are connected to the classes in my Android Project. I want my server to run some JUnit tests in my testproject everytime I commit my code from my Android Project. Is there a best practise to do this? So far I only managed to run the tests when they are a part of a while the JUnit tests and Android classes are separated into 2 different projects, since JUnit runs on JVM and Android in an emulator on DVM (Dalvik Virtual Machine).

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  • jena ontology api

    - by laknath27
    i'm new to jena and protege.i did some stuff with these. i have some problems:: 1) Do i need to use sparql query to get the ontology classes,subclasses,property and values? or can do it with owl-api? can u show me the way? 2) how to get the data property values? 3) how to i load the ontology that define in my local machine and access the classes ? thanks:::

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  • save the text on coreData

    - by Siva
    Hi I am new iphone development. In my app, i am using two textfield and i want to save the text on the dada base which is entered in textfield then i want to display it. Here i am using CoreData base. I am feeling difficult to understand all classes on the coreData base. Here i am created view based application. What are the classes required to achieve that and is there any sample and idea?.

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  • Python importing

    - by Algorist
    Hi, If I have a file myfile.py, which imports Class1 from file.py and file.py contains imports to different classes in file2.py, file3.py, file4.py. In my myfile.py, can I access these classes or do I need to again import file2.py, file3.py etc... My question is whether python automatically add all the imports included in the file I imported, and can I use them automatically. Thank you. Bala

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  • How to Access a decendant object's internal method in C#

    - by Giovanni Galbo
    I'm trying to access a method that is marked as internal in the parent class (in its own assembly) in an object that inherits from the same parent. Let me explain what I'm trying to do... I want to create Service classes that return IEnumberable with an underlying List to non-Service classes (e.g. the UI) and optionally return an IEnumerable with an underlying IQueryable to other services. I wrote some sample code to demonstrate what I'm trying to accomplish, shown below. The example is not real life, so please remember that when commenting. All services would inherit from something like this (only relevant code shown): public class ServiceBase<T> { protected readonly ObjectContext _context; protected string _setName = String.Empty; public ServiceBase(ObjectContext context) { _context = context; } public IEnumerable<T> GetAll() { return GetAll(false); } //These are not the correct access modifiers.. I want something //that is accessible to children classes AND between descendant classes internal protected IEnumerable<T> GetAll(bool returnQueryable) { var query = _context.CreateQuery<T>(GetSetName()); if(returnQueryable) { return query; } else { return query.ToList(); } } private string GetSetName() { //Some code... return _setName; } } Inherited services would look like this: public class EmployeeService : ServiceBase<Employees> { public EmployeeService(ObjectContext context) : base(context) { } } public class DepartmentService : ServiceBase<Departments> { private readonly EmployeeService _employeeService; public DepartmentService(ObjectContext context, EmployeeService employeeService) : base(context) { _employeeService = employeeService; } public IList<Departments> DoSomethingWithEmployees(string lastName) { //won't work because method with this signature is not visible to this class var emps = _employeeService.GetAll(true); //more code... } } Because the parent class lives is reusable, it would live in a different assembly than the child services. With GetAll(bool returnQueryable) being marked internal, the children would not be able to see each other's GetAll(bool) method, just the public GetAll() method. I know that I can add a new internal GetAll method to each service (or perhaps an intermediary parent class within the same assembly) so that each child service within the assembly can see each other's method; but it seems unnecessary since the functionality is already available in the parent class. For example: internal IEnumerable<Employees> GetAll(bool returnIQueryable) { return base.GetAll(returnIQueryable); } Essentially what I want is for services to be able to access other service methods as IQueryable so that they can further refine the uncommitted results, while everyone else gets plain old lists. Any ideas?

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  • Why "menus" unit is finalized too early?

    - by Harriv
    I tested my application with FastMM and FullDebugMode turned on, since I had some shutdown problems. After solving bunch of my own problems FastMM started to complain about calling virtual method on a freed object in TPopupList. I tried to move the menus unit as early as possible in uses so that it would be finalized last, but it didn't help. Is this real problem, a bug in vcl or false alarm from FastMM? Here's the full report from FastMM: FastMM has detected an attempt to call a virtual method on a freed object. An access violation will now be raised in order to abort the current operation. Freed object class: TPopupList Virtual method: Offset +16 Virtual method address: 4714E4 The allocation number was: 220 The object was allocated by thread 0x1CC0, and the stack trace (return addresses) at the time was: 403216 [sys\system.pas][System][System.@GetMem][2654] 404A4F [sys\system.pas][System][System.TObject.NewInstance][8807] 404E16 [sys\system.pas][System][System.@ClassCreate][9472] 404A84 [sys\system.pas][System][System.TObject.Create][8822] 7F2602 [Menus.pas][Menus][Menus.Menus][4223] 40570F [sys\system.pas][System][System.InitUnits][11397] 405777 [sys\system.pas][System][System.@StartExe][11462] 40844F [SysInit.pas][SysInit][SysInit.@InitExe][663] 7F6368 [PCCSServer.dpr][PCCSServer][PCCSServer.PCCSServer][148] 7C90DCBA [ZwSetInformationThread] 7C817077 [Unknown function at RegisterWaitForInputIdle] The object was subsequently freed by thread 0x1CC0, and the stack trace (return addresses) at the time was: 403232 [sys\system.pas][System][System.@FreeMem][2699] 404A6D [sys\system.pas][System][System.TObject.FreeInstance][8813] 404E61 [sys\system.pas][System][System.@ClassDestroy][9513] 428D15 [common\Classes.pas][Classes][Classes.TList.Destroy][2914] 404AB3 [sys\system.pas][System][System.TObject.Free][8832] 472091 [Menus.pas][Menus][Menus.Finalization][4228] 4056A7 [sys\system.pas][System][System.FinalizeUnits][11256] 4056BF [sys\system.pas][System][System.FinalizeUnits][11261] 7C9032A8 [RtlConvertUlongToLargeInteger] 7C90327A [RtlConvertUlongToLargeInteger] 7C92AA0F [Unknown function at towlower] The current thread ID is 0x1CC0, and the stack trace (return addresses) leading to this error is: 4714B8 [Menus.pas][Menus][Menus.TPopupList.MainWndProc][3779] 435BB2 [common\Classes.pas][Classes][Classes.StdWndProc][11583] 7E418734 [Unknown function at GetDC] 7E418816 [Unknown function at GetDC] 7E428EA0 [Unknown function at DefWindowProcW] 7E428EEC [Unknown function at DefWindowProcW] 7C90E473 [KiUserCallbackDispatcher] 7E42B1A8 [DestroyWindow] 47CE31 [Controls.pas][Controls][Controls.TWinControl.DestroyWindowHandle][6857] 493BE4 [Forms.pas][Forms][Forms.TCustomForm.DestroyWindowHandle][4564] 4906D9 [Forms.pas][Forms][Forms.TCustomForm.Destroy][2929] Current memory dump of 256 bytes starting at pointer address 7FF9CFF0: 2C FE 82 00 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 C4 A3 2D 0C 00 00 00 00 B1 D0 F9 7F 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 C0 00 00 00 16 32 40 00 9D 5B 40 00 C8 5B 40 00 CE 82 40 00 3C 40 91 7C B0 B1 94 7C 0A 77 92 7C 84 77 92 7C 7C F0 96 7C 94 B3 94 7C 84 77 92 7C C0 1C 00 00 32 32 40 00 12 5B 40 00 EF 69 40 00 BA 20 47 00 A7 56 40 00 BF 56 40 00 A8 32 90 7C 7A 32 90 7C 0F AA 92 7C 0A 77 92 7C 84 77 92 7C C0 1C 00 00 0E 00 00 00 00 00 00 00 C7 35 65 59 2C FE 82 00 80 80 80 80 80 80 80 80 80 80 38 CA 9A A6 80 80 80 80 80 80 00 00 00 00 51 D1 F9 7F 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 C1 00 00 00 16 32 40 00 9D 5B 40 00 C8 5B 40 00 CE 82 40 00 3C 40 91 7C B0 B1 94 7C 0A 77 92 7C 84 77 92 7C 7C F0 96 7C 94 B3 94 7C 84 77 92 7C , þ ‚ . € € € € € € € € € € € € € € € € Ä £ - . . . . . ± Ð ù . . . . . . . . . . . . . . . . À . . . . 2 @ . [ @ . È [ @ . Î ‚ @ . < @ ‘ | ° ± ” | . w ’ | „ w ’ | | ð – | ” ³ ” | „ w ’ | À . . . 2 2 @ . . [ @ . ï i @ . º G . § V @ . ¿ V @ . ¨ 2 | z 2 | . ª ’ | . w ’ | „ w ’ | À . . . . . . . . . . . Ç 5 e Y , þ ‚ . € € € € € € € € € € 8 Ê š ¦ € € € € € € . . . . Q Ñ ù . . . . . . . . . . . . . . . . Á . . . . 2 @ . [ @ . È [ @ . Î ‚ @ . < @ ‘ | ° ± ” | . w ’ | „ w ’ | | ð – | ” ³ ” | „ w ’ | I'm using Delphi 2007 and FastMM 4.97.

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  • eclipse mtj - proguard : obfuscate third party jar error

    - by robinmag
    i use proguard (support in mtj plugin) to obfuscate a project that has some third party jars but i gives me errors: Your input classes appear to be inconsistent. You may need to recompile them and try again. Alternatively, you may have to specify the options '-dontskipnonpubliclibraryclasses' and/or '-dontskipnonpubliclibraryclassmembers'. It seems that proguard use the classes in JavaSE. It only happens with projects that use third party jars :( Thank you in advanced!

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  • Opt-out of copy constructor

    - by sheepsimulator
    This might be a silly question, but... I've been writing a number of classes that utilize non-copyable members. These classes are never initialized via the copy constructor in my source. When I try to compile without supplying my own copy-constructor, g++ throws out many errors about how it can't build a default copy constructor, due to the non-copyable member objects. Is there a way to tell the compiler to just not give me a copy constructor?

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  • Is there any way to find unreferenced code in Flex Builder?

    - by Andrew Aylett
    We've got several Flex projects, one of which has just been refactored. I'm wondering if there's an easy way to tell which classes and functions (if any) aren't being used any more? I've discovered that we've definitely got some unused code, because running ASDoc on the entire project reports some compilation errors which don't get reported by Flex Builder (implying that those classes aren't being used any more). I'm hoping to find a more robust and complete method, and preferably one which can work at function level too.

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  • How can arguments to variadic functions be passed by reference in PHP?

    - by outis
    Assuming it's possible, how would one pass arguments by reference to a variadic function without generating a warning in PHP? We can no longer use the '&' operator in a function call, otherwise I'd accept that (even though it would be error prone, should a coder forget it). What inspired this is are old MySQLi wrapper classes that I unearthed (these days, I'd just use PDO). The only difference between the wrappers and the MySQLi classes is the wrappers throw exceptions rather than returning FALSE. class DBException extends RuntimeException {} ... class MySQLi_throwing extends mysqli { ... function prepare($query) { $stmt = parent::prepare($query); if (!$stmt) { throw new DBException($this->error, $this->errno); } return new MySQLi_stmt_throwing($this, $query, $stmt); } } // I don't remember why I switched from extension to composition, but // it shouldn't matter for this question. class MySQLi_stmt_throwing /* extends MySQLi_stmt */ { protected $_link, $_query, $_delegate; public function __construct($link, $query, $prepared) { //parent::__construct($link, $query); $this->_link = $link; $this->_query = $query; $this->_delegate = $prepared; } function bind_param($name, &$var) { return $this->_delegate->bind_param($name, $var); } function __call($name, $args) { //$rslt = call_user_func_array(array($this, 'parent::' . $name), $args); $rslt = call_user_func_array(array($this->_delegate, $name), $args); if (False === $rslt) { throw new DBException($this->_link->error, $this->errno); } return $rslt; } } The difficulty lies in calling methods such as bind_result on the wrapper. Constant-arity functions (e.g. bind_param) can be explicitly defined, allowing for pass-by-reference. bind_result, however, needs all arguments to be pass-by-reference. If you call bind_result on an instance of MySQLi_stmt_throwing as-is, the arguments are passed by value and the binding won't take. try { $id = Null; $stmt = $db->prepare('SELECT id FROM tbl WHERE ...'); $stmt->execute() $stmt->bind_result($id); // $id is still null at this point ... } catch (DBException $exc) { ... } Since the above classes are no longer in use, this question is merely a matter of curiosity. Alternate approaches to the wrapper classes are not relevant. Defining a method with a bunch of arguments taking Null default values is not correct (what if you define 20 arguments, but the function is called with 21?). Answers don't even need to be written in terms of MySQL_stmt_throwing; it exists simply to provide a concrete example.

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  • @webservice inheritance java

    - by javamonkey79
    I am trying to build a java ee webservice that has a common base class, but the child classes are the actual @webservice classes (and expose the parent class methods as @webmethod's) Like this: public abstract class Parent { @WebMethod public void doSomething(){//...does stuff} } @WebService public class Child extends Parent {} I've tried (and have failed): - annotating the parent class as a webservice as well - making sure all parent methods are annotated with @WebMethod Is this possible, if so, how?

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  • Dependency on Spring's annotations

    - by Jacques René Mesrine
    I have annotated my classes with @Repository, @Resource, @Component, @Service annotations but these classes must run in 2 environments. The first environment is Spring 2.x based while the other has no spring at all. I'm sure the code will fail without the spring jars & I want to know ideas from you on how I can retain the annotations but still work in both environments

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  • Using MOA to classify new examples?

    - by Sam Zetoloth
    I'm trying to use the java machine learning library MOA to train on a training data stream, then predict classes for a test data stream. The first part works fine, using (for example) java -cp .:moa.jar:weka.jar -javaagent:sizeofag.jar moa.DoTask "LearnModel -l MajorityClass -s (ArffFileStream -f atrain.arff -c -1) -O amodel.moa" But then I cannot figure out how to use the trained model (amodel.moa) on another stream (atest.arff) to predict the classes. Has anyone done this before?

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  • Quartz.properties

    - by pandi-sus
    I developed an EAR using Quartz API. I have put my quartz.properties file in the classpath(WEB-INF/classes in war). Added following lines to web.xml file <context-param> <param-name>config-file</param-name> <param-value>/WEB-INF/classes/quartz.properties</param-value> </context-param> But Quartz still loads the default properties file from the quartz.jar

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