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  • Is there anything wrong with my Factory class?

    - by Alex
    class PieceFactory { @SuppressWarnings("rawtypes") public Piece createPiece(String pieceType) throws Throwable{ Class pieceClass = Class.forName(pieceType); Piece piece = (Piece) pieceClass.newInstance(); return piece; } } I'm not all used to handling exceptions yet therefore I'm just throwing them, but everywhere I use a method that uses this factory it tells me I have to throw exceptions like throwable. For example, in one of my classes I have a method that instantiates a lot of objects using the method that uses the factory. I can use the method in that class by just throwing the exception, however it won't work if I try to pass a reference to that class to another class and then use the method from there. Then it forces me to try catch the exception. I probably don't need a factory but it seemed interesting and I'd like to try to use patterns. The reason I created the factory was that I have 6 subclasses of Piece and I wan't to use a method to instantiate them by passing the type of subclass I want as an argument to the method.

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  • What is the best solution to do Reporting on Object data for .NET ?

    - by Peter Fox
    Hi, Our projects are using objects as the data source to reports. Our business layer is returning single objects or IEnumerable. Our reports (quite complex) need to display value-type properties of the object, and its related objects. Typical case would be, from a List, display a master report with category data, then a subreport with data for each Product inside each Category, then a subreport for each Part of each Product, and so on. Reporting from the database is not an option for us. We have tried so far - Reporting Services : works but have to mess around with the XML definition of the report to define the datasource classes, very hard to work with if you use an object datasource, architecturally not too clean - Telerik Reports : quite nice (esp., nice architecture) but seems to have problems with complex reports (master/sub), does not give great paging control, rumored to have performance/crash problems (immature product). Does anyone know a good reporting solution that can be integrated in an ASP.NET application and works well with objects as datasources ?

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  • NHibernate bag is always null

    - by Neville Chinan
    I have set up my mapping file and classes as suggested by many articles class A { ... IList BBag {get;set;} ... } class B { ... A aObject {get;set;} ... } <class name="A">...<bag name="BBag" table="B" inverse="true" lazy="false"><key column="A_ID" /><one-to-many class="B" /></bag>... <class name="B">...<many-to-one name="aObject" class="A" column="A_ID" />... I added a set of A's to the A table and a set of B's to the B table, all the data is stored as expected. However if I try and access aInstance.BBag.Count I get a null reference exception. I think I missing some key knowledge on how an bag gets instantiated. Thanks

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  • Invoke Maven-Module build from intellij

    - by Roman
    Hi All I was wondering if someone knows a way to invoke a specific maven module build from IntelliJ that will also build ( or use already compiled classes ) from depended modules. So for instance if I would like to build the module "Model" in the picture and only it , it seems reasonable for me to click the package step on it. But what is actually does it invokes the mvn package step inside this specific module rather than "mvn -am -pl module-name" from the root module , which also builds all the dependencies. So is there something that I just don't know ?

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  • Rails Cache Sweeper and Model Callback Firing

    - by Topher Fangio
    Hey guys, I have the following classes: class Vigil < ActiveRecord::Base after_update :do_something_cool private def do_something_cool # Sweet code here end end class NewsFeedObserver < ActionController::Caching::Sweeper observe Vigil def after_update # Create a news feed entry end end Everything works as expected. The after_update in the sweeper requires that the do_something_cool method in the model has finished before it can run properly. The problem is that the after_update in the sweeper is being called before (or perhaps at the same time as) the do_something_cool callback and it's causing problems. Does anyone know how to force the after_update in the sweeper to fire after the model callback? Is there better way to achieve this?

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  • Can a CWinApp be placed in a DLL?

    - by jmucchiello
    I'm updating some legacy apps to Visual Studio 10 and am in linker hell. All of these DLLs derive classes from CWinApp and use AfxGetApp() to get access to the object. When I link the DLLs I get unresolved externals that look like global static objects that would get pulled in by a normal app's main(): Shell.lib(SHELL.obj) : error LNK2001: unresolved external symbol "public: static struct CRuntimeClass const CException::classCException" (?classCException@CException@@2UCRuntimeClass@@B) Shell.lib(SHELL.obj) : error LNK2001: unresolved external symbol "public: static struct CRuntimeClass const CFrameWnd::classCFrameWnd" (?classCFrameWnd@CFrameWnd@@2UCRuntimeClass@@B) Shell.lib(SHELL.obj) : error LNK2001: unresolved external symbol "public: static class CRect const CFrameWnd::rectDefault" (?rectDefault@CFrameWnd@@2VCRect@@B) My current combination of ignore default libraries and additional libraries (the method you can easily google to find the answer to linker hell) is: msvcprtd.lib,mfc100d.lib,mfcs100d.lib,libcmtd.lib When I add nafxcwd.lib (the mfc library), these three external symbols resolve but I end up with a bunch of other duplicate symbols (requiring the use of /FORCE:MULTIPLE) and in end __argc and __argv become unresolved. So the basic question is: Can you link a DLL containing a CWinApp in VS10? How do you setup the linker to do it?

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  • Copying a Polymorphic object in C++

    - by doron
    I have base-class Base from which is derived Derived1, Derived2 and Derived3. I have constructed an instance for one of the the derived classes which I store as Base* a. I now need to make a deep copy of the object which I will store as Base* b. As far as I know, the normal way of copying a class is to use copy constructors and to overload operator=. However since I don't know whether a is of type Derived1, Derived2 or Derived3, I cannot think of a way of using either the copy constructor or operator=. The only way I can think of to cleanly make this work is to implement something like: class Base { public: virtual Base* Clone() = 0; }; and the implement Clone in in the derived class as in: class Derivedn : public Base { public: Base* Clone() { Derived1* ret = new Derived1; copy all the data members } }; Java tends to use Clone quite a bit is there more of a C++ way of doing this?

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  • building a web application in eclipse

    - by Noona
    As a concluding assignment for the technologies taught in a data management course, we have to write a web application using the technologies taught throughout the course, this mostly includes xhtml, css, JSP, servelets, JDBC, AJAX, webservices. the project will eventually be deployed using tomcat. we are given the option of choosing the technologies that we see fit. since this is my first time developing a web application I am having some uncertainties about where to start, so for example now I am writing the object classes that will be used in the database and implementing the operations that will be performed on the database, but I am not sure about how to make these operations available to a client through the website, I mean I think I have to write a servlet through which I can extract the request parameters and set the response accordingly, but I would still like a more specific overview of what I am going to do, so if someone can link me to a tutorial with an example that makes use of these technologies while illustrating the stages of the design so that I can see how all these things are linked together in a web project. thanks

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  • Do I need to force the GAC to reload an assembly? Is this possible?

    - by Ben McCormack
    I've added types to my .NET classes that I'm using for COM interop. To get it to work with my VB6 application, I unregistered the DLL and re-registered it (using regasm). I then uninstalled and reinstalled it to the GAC (using gacutil). The types are showing up in the VB6 object explorer, but when I run the application in the VB6 IDE, it breaks on the line that instantiates the new types with the error: Automation Errror - The System cannot find the file specified. I thought this odd since I had already updated the GAC, so I uninstalled the dll from the GAC and got the exact same error, which seems to indicate that the older version of the dll is already in memory and needs to be "reloaded" so that the newer DLL is in memory. Is this possible, and if so, what do I need to do?

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  • Open source configuration framework for ASP.NET - does one exist?

    - by Jon
    We currently have an old product written in classic asp and are about to re-write parts in ASP.NET. One big problem is that much of the cutomer-specifics within the system are hard coded. We want to split this out for specific customers by storing data in the database. Is there a quick an easy open source framework which allows me to set up some quick tables and simple UIs to allow me to change configuration items? We have 6-7 modules, and it would be nice to have the ability to have system admins gain access to a configuration area where they can set-up settings in a tabbed UI format, settings could also be set-up to allow dropdown, fields, numbers etc. The items could then be accessed via classes in C#/vb for use within the operational parts of the system. If not, I'm suprised and it might even be a good basis for a new open source project.

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  • Ruby on Rails: Unit Testing non activerecord models and still load fixtures

    - by Vaibhav Gumashta
    I may be missing something but I am stuck in this scenario: I have a non activerecord model, which I want to test. I have derived its test case class from: Test::Unit::TestCase. However, the test case class for the model, uses within itself, other activerecord model classes and I want to load fixtures for them. My problem is that the fixtures class method is available only when I subclass the test case class from ActiveSupport::TestCase (it is defined within ActiveRecord::TestFixtures which gets included in ActiveSupport::TestCase). Any help, coz running the tests gives me the error: undefined method "fixtures" (which is understandable) and in case I derive my test case class from ActiveSupport::TestCase it complains that there is no corresponding DB table. Also, I don't want to create a dummy table for backing my model class. Thanks a ton!

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  • Ruby get inheriting class

    - by Brian D.
    I'm working on creating my first plugin for rails. I'm still pretty new to ruby and I was wondering if its possible to get the inheriting class? For example, I'm trying to create a plugin that will allow unit testing and functional testing when you are not using migrations. What I'm trying to do is initialize a class variable named controller to be initialized to the type of controller that is being tested. If I have a base class ControllerTest: class ControllerTest < Test::Unit::TestCase attr_accessor :controller def initialize super @controller = "call function that will find the inheriting classes name and create an instance of that controller type." end end So what I'm currently stuck on is getting the name of the inheriting class. Is this possible? And if not, does anyone know another way on how I could go about implementing this? Thanks in advance.

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  • How to test silverlight behaviors using Rhino Mocks?

    - by Derek
    I have slightly adapted the custom behavior code that can be found here: http://www.reflectionit.nl/blog/default.aspx?guid=d81a8cf8-0345-48ee-bbde-84c2e3f21a25 that controls a MediaElement. I need to know how to go about testing this with Rhino Mocks e.g. how to instantiate a new ControlMediaElementAction in test code and then call the Invoke method etc. Doing something simple like this in test code: mMediaElementControlBehaviour = new ControlMediaElementAction (); gives me an exception "The type initializer for 'System.Windows.DependencyObject' throw an exception. Thinking it was the instantiation of the MediaElement, I tried this two lines of code: MediaElement mediaElementStub = MockRepository.GenerateStub(); this.Container.RegisterInstance(mediaElementStub); This gave the exception 'Can't create mocks of sealed classes' If someone can point me in the right direction, it would be apreciated. Silverlight 4, Rhino Mocks 3.5 Silverlight v2.0.50727 Thanks,

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  • Include all imports in Air application Bundle?

    - by Carlos Barbosa
    How can I import all files and classes into my AIR bundle... it must take a note that I created first a flex project, and set it's main class as Actionscript (.as) . When I build a release all my imports (org) etc.. are not included in the .AIR installer... i have checked this by installing the app and then after show package contents, notice that the diretory structure exists but it doesn't include any of other .as used as imports... import org.papervision3d.cameras.Camera3D; import org.papervision3d.materials.BitmapFileMaterial; import org.papervision3d.materials.utils.MaterialsList; import org.papervision3d.objects.DisplayObject3D;

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  • Start multiple processes of a dll in delphi

    - by Tom
    I have a "ActiveX library" project created with Delphi 2007. The library interface return XML data based on input values. This is then used by a PHP script that displays the data on a web page. This works great! The problem is that i can only run one instance of the dll process on the server. However, for security reasons, each of my customer should be able to access their own process of the dll (because the dll is always connected to only one database). Also, because of the way the delphi code is built, it doesn't support multiple threads. (It's a 100 000+ lines project using lots of singleton classes) Is there a way of starting several instances of the same dll? Is there a better way of transferring XML data from delphi to PHP? Sorry for the longish question, any help is appreciated (ps. I know the delphi code should be refactored, but this would mean 6 months of "circular reference" -hell :)

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  • How set opacity on QGraphicsItem

    - by La Chamelle
    Hello, i have a inherited from QGraphicsScene and QGraphicsItem to create my own classes. I use Qt 4.6. I want to set a specific opacity on each items of my scene. I use setOpacity : setOpacity method, but its not the result i hope. I want to have for example one item opaque and an other transparent (to see the desktop, or the other application). But if i dont set the opacity of the QGraphicsView to 0.5, i have not the transparancy. And if the QGraphicsView is set to 0.5, the item is not real opaque. What should i do ? Thanks you.

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  • how to debug java mail

    - by voipp
    My goal is to debug my programm, that uses java mail library(including javax.mail and com.sun.mail). So i decided first to download java mail sources and compile it with option -g. I go to the java mail sources and binaries , downloaded them. Somehow sources store in jar but not just zip. Ok. Then i decided to decompile jar into zip with JAD plugin in eclipse. After decompiling i receive empty directory. I downloaded jad.exe and run it , but it throwed a message : JavaClassFileParseException: Not a class file. It says it decompiles only classes, but what about jars? Is it so hard just store sources in fu** zip ???!!!!

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  • How to compile these 2 java files correctly?

    - by user198729
    I'm following the steps here, it's basically : Compile the DataSource and LiveStream classes: javac -d . DataSource.java LiveStream.java Run using JMStudio: java JMStudio screen://0,0,160,120/10 But when I compile them, got lots of errors like javax.media doesn't exist and so on. Here's the directory structure: D:\>dir 2010-06-11 22:25 <DIR> . 2010-06-11 22:25 <DIR> .. 2010-06-11 22:25 3,730 DataSource.java 2010-06-11 22:25 6,860 LiveStream.java Can someone give more detailed steps how to set up the environment correctly to compile correctly?

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  • MySQL or SQL Server

    - by user203708
    I'm creating an application that I want to run on either MySQL or SQL Server (not both at the same time) I've created two PHP classes DatabaseMySQL and DatabaseSQLSVR and I'd like my application to know which database class to use based on a constant set up at install. define(DB_TYPE, "mysql"); // or "sqlsrv" I'm trying to think of the best way to handle this. My thought is to do an "if else" wherever I instantiate the database: $db = (DB_TYPE == "mysql") ? new DatabaseMySQL : new DatabaseSQLSVR; I know there has to be a better way of doing this though. Suppose I want to add a third database type later; I'll have to go and redo all my code. Yuk!! Any help would be much appreciated. Thank

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  • Java: implementation of simple commands

    - by HH
    I have created a pkg for my regular simple commands. They are non-static, to be more extensible, but somewhat more time-consuming to use because of creating object to use one. My other classes use them. $ ls *.java CpF.java IsBinary.java RmLn.java Tools.java F2S.java IsRoot.java SaveToDisk.java WordCount.java Filters.java ModRelativePaths.java SetWord.java WordNumber.java Find.java powerTools.java Sort.java Which option would you choose to use them easier? to develop a small interface like 'powerTools.java' for the pkg. to create a class with static methods for them. to add a static method to each class to stop overusing 'creating too many files' and centralising some? sthing else?

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  • Immutable Dot Net strings

    - by klork
    I usually define my string variables in vb.net as Dim f_sName as string=String.Empty f_sName = "foo" Given the immutable nature of strings in .net, is there a better way to initialize strings and deal with the "Variable 'f_sName ' is used before it has been assigned a value. A null reference exception could result at runtime." warning? Also for classes that do not have constructors which accept no arguments such as System.Net.Sockets.NetworkStream, what is the best way to define and initialize a variable of that type? All comments are highly appreciated. Thanks

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  • Partial Git deployment strategy?

    - by MatW
    I need to setup a Kohana dev environment that allows me to make full use of shared module / system classes across separate applications. Each application typically belonging to a different client. I use Git for source control, but am struggling to come up with a clean deployment method that will allow me to pull only those parts of the dev environment specific to a client / app down into that client's production environment (assuming that the client's production environment will have Git installed). Dev enviroment: - kohana - applications - clientapp1 - clientapp2 - modules - public_html - clientapp1 - clientapp2 - system - 3.0.1 - 3.0.5 Client 1's production environment: - / - applications - clientapp1 - modules - public_html - client_app1 - system - 3.0.5 Naturally, I want to have total control over each client "sub repo" as if it were an independent repo (in terms of gitignore, etc). I have seen topics that cover Git's sparse checkout feature, but it seems like it may cause a few problems down the line from a maintenance point of view, and I don't like the idea of the entire repo's metadata existing in client's production environment repo. As you can probably tell, I'm not exactly a Git poweruser, so any suggestions / wisdom are very welcome!

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  • .NET ORM and Security

    - by Sphynx
    We're going to use an ORM tool with a .NET desktop application. The tool allows creation of persistent classes. It generates all database tables automatically. In addition to other data, our system needs to store user credentials, and deliver access control. The question is, is there any possibility of access control by means of ORM, without creating the database authentication mechanisms manually? Is there any product on the market which allows this? We thought of limiting the access in the program itself, but users can easily access the database directly, and bypass the program limitations. Thanks.

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  • Howto write a class where a property can be accessed without naming it.

    - by SchlaWiener
    I have a (dump) question regarding VB/C# I often use third party classes where I can access a child object with only specifying the id or key. Example: Instead of writing: DataRow row = GetAPopulatedDataRowSomeWhere(); Object result = row.Items[1]; // DataRow has no Items property Object result = row.Items["colName"]; // Also not possible I use this code to access the members: DataRow row = GetAPopulatedDataRowSomeWhere(); Object result = row[1]; Object result = row["colName"]; Can someone tell me how a class has to look like to support this syntax? My own class has a Dictionary that I want to access this way. MyClass["key"]; // <- that's what I want MyClass.SubItems["key"]; // <- that's how I use it now

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  • How to make video in Java captured from webcam through lti-Civil CaptureDeviceStream ?

    - by i.Psi
    Can I do it only with the lti-Civil classes or I need FMJ or JMF ? do I use the actual Stream or set of captured Images from CaptureObserver? Thanks. captureStream = system.openCaptureDeviceStream(info.getDeviceID()); captureStream.setObserver(new CaptureObserver(){ public void onError(CaptureStream arg0, CaptureException arg1) { } public void onNewImage(CaptureStream streamSource, Image image) { try { imageFrame.setImage(AWTImageConverter.toBufferedImage(image)); bufferedImage = AWTImageConverter.toBufferedImage(image); } catch (Throwable t) { t.printStackTrace(); } } }); captureStream.start();

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