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• How can I use CSS pseudo-classes with GWT's UiBinder?

  - by David

  I've been using the in-line styles approach as recommended by GWT's UiBinder documentation. I'm puzzled, though, about how to use CSS pseudo-classes with UiBinder; for example, suppose I would otherwise (without UiBinder) have this CSS rule: #myLink:hover { background:blue } Can I implement that rule in UiBinder?

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• Using "class/object" MooTools-style events in jQuery

  - by Infinity

  One of the nice things about MooTools, is that it lets you easily assign/fire events to objects, for example: var playerSingleton = new (new Class({ Implements: [Events], initialize: function() {}, setVolume: function() { // do some stuff.. this.fireEvent('volumeChanged') } })); // Somewhere else... playerSingleton.addEvent('volumeChanged', function() { // do something when volume changes }); playerSingleton.setVolume(75); // bam our event fires. How would something like this be done with jQuery? I know there's .bind and .trigger, but it seems like the only way to do this is to bind/fire events to the window object: $(window).bind('volumeChanged', fn); Is there anything better than this, more like the MooTools approach? Thanks!

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• Modifying platform/frameworks/base package

  - by tareqHs

  Hi, I'm planning to modify some bits in the platform/frameworks/base project in Android Donut r2. The modifications are very small and go into java packages android.graphics and android.text (the API isn't affected). What jar libraries do I have to copy from the recompiled platform? the modifications are small and I don't want to replace the whole system.. I'm trying to replace specific jar libraries. Thank you

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• c++ vector.push_back error: request for member 'push_back'..., which is of non-class type 'vector(ch

  - by Ziplin

  I'm using Cygwin with GCC, and ultimately I want to read in a file of characters into a vector of characters, and using this code #include <fstream> #include <vector> #include <stdlib.h> using namespace std; int main (int argc, char *argv[] ) { vector<char> string1(); string1.push_back('a'); return 0; } generates this compile time error: main.cpp: In function int main(int, char**)': main.cpp:46: error: request for memberpush_back' in string1', which is of non -class typestd::vector ()()' I tried this with a vector of ints and strings as well and they had the same problem.

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• Creating Instance of a DataContract Class on the client side

  - by hgulyan

  I'm not sure, if it's right to do this, but I'd like to ask this question again ( http://stackoverflow.com/questions/2498644/creating-instance-of-a-service-side-datacontract-class-on-client-side-in-wcf ). The main question is - why there's difference between creating instance on the client side and creating it on the server side? Why there're some properties, that lose their values when you create them on the client side and pass it to service's functions? What could be the issue? Any version will be appreciated. I've written about my problem in the update part of the question in that link. Thank You. p.s. If this is against the rules, I'll delete it.

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• Java 'Prototype' pattern - new vs clone vs class.newInstance

  - by Guillaume

  In my project there are some 'Prototype' factories that create instances by cloning a final private instance. The author of those factories says that this pattern provides better performance than calling 'new' operator. Using google to get some clues about that, I've found nothing really relevant about that. Here is a small excerpt found in a javdoc from an unknown project javdoc from an unknown project Sadly, clone() is rather slower than calling new. However it is a lot faster than calling java.lang.Class.newInstance(), and somewhat faster than rolling our own "cloner" method. For me it's looking like an old best practice of the java 1.1 time. Does someone know more about this ? Is this a good practice to use that with 'modern' jvm ?

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• Spring constructor injection of SLF4J logger - how to get injection target class?

  - by disown

  I'm trying to use Spring to inject a SLF4J logger into a class like so: @Component public class Example { private final Logger logger; @Autowired public Example(final Logger logger) { this.logger = logger; } } I've found the FactoryBean class, which I've implemented. But the problem is that I cannot get any information about the injection target: public class LoggingFactoryBean implements FactoryBean<Logger> { @Override public Class<?> getObjectType() { return Logger.class; } @Override public boolean isSingleton() { return false; } @Override public Logger getObject() throws Exception { return LoggerFactory.getLogger(/* how do I get a hold of the target class (Example.class) here? */); } } Is FactoryBean even the right way to go? When using picocontainers factory injection, you get the Type of the target passed in. In guice it is a bit trickier. But how do you accomplish this in Spring?

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• How would I best address this object type heirachy? Some kind of enum heirarchy?

  - by FerretallicA

  I'm curious as to any solutions out there for addressing object heirarchies in an ORM approach (in this instance, using Entity Framework 4). I'm working through some docs on EF4 and trying to apply it to a simple inventory tracking program. The possible types for inventory to fall into are as follows: INVENTORY ITEM TYPES: Hardware PC Desktop Server Laptop Accessory Input (keyboards, scanners etc) Output (monitors, printers etc) Storage (USB sticks, tape drives etc) Communication (network cards, routers etc) Software What recommendations are there for handling enums in a situation like this? Are enums even the solution? I don't really want to have a ridiculously normalised database for such a relatively simple experiment (eg tables for InventoryType, InventorySubtype, InventoryTypeToSubtype etc). I don't really want to over-complicate my data model with each subtype being inherited even though no additional properties or methods are included (except PC types which would ideally have associated accessories and software but that's probably out of scope here). It feels like there should be a really simple, elegant solution to this but I can't put my finger on it. Any assistance or input appreciated!

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• Is there a way to call custom method of Custom Role Provider class

  - by IrfanRaza

  Hello friends, I have created my own custom role provider class "SGI_RoleProvider" and configured properly. Everything is working fine. Suppose that I have added a public method say "SayHello()", then how can i call that. Because if i am using Roles then the method is not displayed. If i am forcefully using that Roles.SayHello() then compiler gives the error. Any suggestion how can i call this. Because creating a new instance of SGI_RoleProvider is meaningless. Thanks for sharing your time.

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• wcf class implementing two operation contracts in different service contracts with same name

  - by Archie

  Hello, I have declared two service contracts as follows: [ServiceContract] public interface IContract1 { [OperationContract] double Add(int ip); } [ServiceContract] public interface IContract2 { [OperationContract] double Add(double ip); } I have a class which implements these two contracts. I have created two end points for both the contracts. But I'm not able to access the service from client code. It displays a big error when i try to update the service reference as: Metadata contains an error that cannot be resolved.... There was no endpoint listening at ... etc. I know that you can't have two OperationContracts with the same name but is it possible to have two operation contracts in different service contracts with same name but different signature? Thanks.

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• Assigning to struct in different class

  - by 4thSpace

  I have a struct in ClassA and want to assign it to the same struct in ClassB (the two structs are the same with different names). ClassA and ClassB are view controllers. Basically, I need to pass this struct to another class. However, structs don't seem to be exposed as members, which means I can't access them. Here is ClassA's struct declared in its header file: typedef struct { NSString *startDate; NSString *endDate; NSString *classId; } selectedItemsClassAStruct; selectedItemsClassAStruct selectedItemsClassA; and the same for ClassB (just with ClassA text replaced) It doesn't appear in code hints for ClassB. I see this error if I try to access it: request for member 'selectedItemsClassBStruct' in something not a structure or union How should it be done?

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• Inheriting from the web client class

  - by robUK

  Hello, C# 2008 I am not sure how much work there is to inheriting from the web client class. Currently I am using it in my project. And I can't change to anything else. The customer would like to have a timeout after a certain period of time. The web client doesn't have this. So rather than re-invent the wheel, I am thinking of inheriting from the web client and adding this property. Do you think this is a suitable solution? Could it mean more work just to add this. What is the easiest way to go about this? Many thanks,

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• Inherit from Type class of .Net

  - by Miguel Angelo

  Is there any point at all on inheriting from Type class in .Net? i.e. What could be the meaning of doing so? I am asking this because of this text in MSDN documentation: Notes to Inheritors When you inherit from Type, you must override the following members... list of members. MSDN doc for Type: http://msdn.microsoft.com/en-us/library/system.type.aspx ok, that is actually saying that anyone can inherit from Type... but they dont say why would you ever want to do that. Thanks!

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• Define 'poco'?

  - by saku

  Can someone define what exactly 'poco' means? I've encountering the term more and more often and I'm wondering is it only about plain classes or it mean something more?

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• adldap class, need to search for user in two groups

  - by Brad

  http://adldap.sourceforge.net/wiki/doku.php?id=api_user_functions#user_ingroup_username_group_recursive_null I am using the adLDAP class above to authenticate users against our ldap server. I was wondering how I could check multiple groups to see if the user belongs to either, if they belong to either. I don't know if user_ingroup($username,$group,$recursive=NULL); can handle search two different groups for the user, need help coding it to search for the user in two different groups, and as soon as it finds it in one of those, break the operation and set a variable to true. Any help is appreciated.

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• synchronized block in JSP tag class

  - by Sudhakar

  Hi, I am trying to find answer for the following ,for the past couple of days ,but couldnt find comprehensive answer Problem Statement I have a custom JSP tag class which handles a web form submission ,captures data and write it to same file in the filesystem. As all web applications,this can be triggeredsimultaneosly ,and i fear that multiple threads would be in action handling each of the submission (we all know thats how Servlet works.) CODE synchronized (this){ final String reportFileName = "testReport.csv"; File reportDir = new File( rootCsDirectory, "reports" ); if(!reportDir.isDirectory())reportDir.mkdir(); File reportFile = new File (reportDir, reportFileName); logReport(reportFile,reportContent.toString()); } ISSUE: - A File object can be opened by one thread for writing and at same time another thread might try to access and fail and throw an exception So i thought of synchronizing (on the object ) should solve the issue , but read some where that jsp engine would have pool of jsp tag objects, so i am afraid that synchronized (this) wont work and it should be changed to synchronized (this.getClass())

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• Ruby Exception or Error?

  - by Ell

  I have noticed that in the Ruby exception hierarchy, there are "errors" such as ArgumentError and there are "exceptions" such as SignalException. Is there a certain practise of naming exceptions? thanks in advance, ell.

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• F#: Define an abstract class that inherits an infterface, but does not implement it

  - by akaphenom

  I owuld like to define an abstract class that inerhits from UserControl and my own Interface IUriProvider, but doesn't implement it. The goal is to be able to define pages (for silverlight) that implement UserControl but also provide their own Uri's (and then stick them in a list / array and deal with them as a set: type IUriProvider = interface abstract member uriString: String ; abstract member Uri : unit -> System.Uri ; end type UriUserControl() as this = inherit IUriProvider with abstract member uriString: String ; inherit UserControl() Also the Uri in the definition - I would like to implement as a property getter - and am having issues with that as well. this does not compile type IUriProvider = interface abstract member uriString: String with get; end Thank you...

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• VC++ Charts using Chart X

  - by Arjun

  Hi, I'm new to drawing the chart using chartfx can you give me the meanings of teh following methods, they are kinda confusing...I did not find documentation anywhere. GetValue ( ) GetXValue ( ) PutItem() Thanks, Arjun

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• NS2, Otcl: using a variable of an owned instance within a class

  - by Hussain

  Hello all, I'm using NS2 to create some new classes in C++ and then link them to otcl. The linkage and everything works, but when I try to use the otcl variables in an object, I'm having a trouble. For example, suppose I have a class "Node" with the variable X. In the code I want to set this value and later on use it in some if-statements. Setting the variable is no problem using this code: $node1 set x 4 Now the problem I'm having is when I try to use this variable x anywhere. In C++ we could use a general variable (i.e. y) and say "y=node.x and then use y in some if-statements. I have tried to look for a method to perform the same thing in otcl, but failed. Any help is appriciated. Thanks in Advance.

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• Ambiguous Generic restriction T:class vs T:struct

  - by Maslow

  This code generates a compiler error that the member is already defined with the same parameter types. private T GetProperty<T>(Func<Settings, T> GetFunc) where T:class { try { return GetFunc(Properties.Settings.Default); } catch (Exception exception) { SettingReadException(this,exception); return null; } } private TNullable? GetProperty<TNullable>(Func<Settings, TNullable> GetFunc) where TNullable : struct { try { return GetFunc(Properties.Settings.Default); } catch (Exception ex) { SettingReadException(this, ex); return new Nullable<TNullable>(); } } Is there a clean work around?

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• Basic Java Multi-Threading Question

  - by Veered

  When an object is instantiated in Java, is it bound to the thread that instantiated in? Because when I anonymously implement an interface in one thread, and pass it to another thread to be run, all of its methods are run in the original thread. If they are bound to their creation thread, is there anyway to create an object that will run in whatever thread calls it?

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• .NET template class instance - passing a variable data type

  - by FerretallicA

  As the title suggests, I'm tyring to pass a variable data type to a template class. Something like this: frmExample = New LookupForm(Of Models.MyClass) 'Works fine Dim SelectedType As Type = InstanceOfMyClass.GetType() 'Works fine frmExample = New LookupForm(Of SelectedType) 'Ba-bow! frmExample = New LookupForm(Of InstanceOfMyClass.GetType()) 'Ba-bow! LookupForm<Models.MyClass> frmExample; Type SelectedType = InstanceOfMyClass.GetType(); frmExample = new LookupForm<SelectedType.GetType()>(); //Ba-bow frmExample = new LookupForm<(Type)SelectedType>(); //Ba-bow I'm assuming it's something to do with the template being processed at compile time but even if I'm off the mark there, it wouldn't solve my problem anyway. I can't find any relevant information on using Reflection to instance template classes either. (How) can I create an instance of a dynamically typed repository at runtime?

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• Marshal a C++ class to C#

  - by Adam Haile

  I need to access code in a native C++ DLL in some C# code but am having issues figuring out the marshaling. I've done this before with code that was straight C, but seem to have found that it's not directly possible with C++ classes. Made even more complicated by the fact that many of the classes contain virtual or inline functions. I even tried passing the headers through the PInvoke Interop Assistant, but it would choke on just about everything and not really no what to do... I'm guessing because it's not really supported. So how, if at all possible, can you use a native C++ class DLL from .NET code. If I have to use some intermediary (CLR C++?) that's fine.

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• In java what are nested classes and what do they do?

  - by David

  In java what are nested classes and what do they do?

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