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  • Java generic function for performing calculations on integer, on double?

    - by Daniel
    Is this possible? Surely if you passed in a double, any sort of function implementation code which casts an object to an Integer would not be able to work unless the cast 'Integer' was specifically used? I have a function like: public static void increment(Object o){ Integer one = (Integer)o; system.out.println(one++); } I cant see how this could be made generic for a double? I tried public static <E> void increment(E obj){ E one = (E)o; system.out.println(one++); } but it didn't like it?

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  • Getting a java collection of objects in Alphabetical order

    - by MichaelMcCabe
    I have a question that I dont really know where to start. So I thought i'd ask it here. Basically, I have a drop down with names in it. I want these names to be in alphabetical order. Populating the drop down happens as follows; I query a database and pull down an Id and Name, make a object called "UserList", and set the name and id variables with what I get back. I then add this object to an ArrayList. I do this over and over. I then convert this collection to an array, and pass it to my JSP page using session.setAttribute("userList", UserList); I then populate the drop down as below. <c:forEach items="${usersCompanysList}" var="c" > There probably is a simple answer but how to I sort these names?

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  • What do you do when you hate programming?

    - by Vimvq1987
    Don't know where to ask this question. It's likely to be closed, I know. I got a hard work. Tried to code, tried to search, tried to ask. Got nothing. It make me terribly tired, and some way, I feel that in this moment, I hate programming. Some said that hard works improve yourself, yes, but not impossible-works. Is there sometimes that you hate programming? Is there sometimes that you feel so tired of writing code? How do you overcome those times?

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  • Binding one dependency property to another

    - by Gregory Dodd
    I have a custom Tab Control that I have created, but I am having an issue. I have an Editable TextBox as part of the custom TabControl View. <Controls:EditableTextControl x:Name="PageTypeName" Style="{StaticResource ResourceKey={x:Type Controls:EditableTextControl}}" Grid.Row="0" TabIndex="0" Uid="0" AutomationProperties.AutomationId="PageTypeNameTextBox" AutomationProperties.Name="PageTypeName" Visibility="{Binding ElementName=PageTabControl,Path=ShowPageType}"> <Controls:EditableTextControl.ContextMenu> <ContextMenu x:Name="TabContextMenu"> <MenuItem Header="Rename Page Type" Command="{Binding Path=PlacementTarget.EnterEditMode, RelativeSource={RelativeSource AncestorType=ContextMenu}}" AutomationProperties.AutomationId="RenamePageTypeMenuItem" AutomationProperties.Name="RenamePageType"/> <MenuItem Header="Delete Page Type" Command="{Binding Path=PageTypeDeletedCommand}" AutomationProperties.AutomationId="DeletePageTypeMenuItem" AutomationProperties.Name="DeletePageType"/> </ContextMenu> </Controls:EditableTextControl.ContextMenu> <Controls:EditableTextControl.Content> <!--<Binding Path="CurrentPageTypeViewModel.Name" Mode="TwoWay"/>--> <Binding ElementName="PageTabControl" Path="CurrentPageTypeName" Mode ="TwoWay"/> </Controls:EditableTextControl.Content> </Controls:EditableTextControl> In the Content section I am binding to a Dependency Prop called CurrentPageTypeName. This Depedency prop is part of this custom Tab Control. public static DependencyProperty CurrentPageTypeNameProperty = DependencyProperty.Register("CurrentPageTypeName", typeof(object), typeof(TabControlView)); public object CurrentPageTypeName { get { return GetValue(CurrentPageTypeNameProperty) as object; } set { SetValue(CurrentPageTypeNameProperty, value); } } In another view, where I am using the custom TabControl I then bind my property, with the actual name value, to CurrentPageTypeName property as seen below: <Views:TabControlView Grid.Row="0" Name="RunPageTabControl" TabItemsSource="{Binding RunPageTypeViewModels}" SelectedTab="{Binding Converter={StaticResource debugConverter}}" CurrentPageTypeName="{Binding Path=RunPageName, Mode=TwoWay}" TabContentTemplateSelector="{StaticResource tabItemTemplateSelector}" SelectedIndex="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}, Path=DataContext.SelectedTabIndex}" ShowPageType="Hidden" > <!--<Views:TabControlView.TabContentTemplate> <DataTemplate DataType="{x:Type ViewModels:RunPageTypeViewModel}"> <RunViews:RunPageTypeView/> </DataTemplate> </Views:TabControlView.TabContentTemplate>--> </Views:TabControlView> My problem is that nothing seems to be happening. It is grabbing its Content from the Itemsource, and not from my chained Dependency props. Is what I am trying even possible? If so, what have I done wrong. Thanks for looking.

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  • Firefox all but freezes during large file upload; Ajax progress bar infeasible; IE6 works fine

    - by Sean
    I want to provide a progress bar for my users who upload very large files. I did some reading and implemented what should be a pretty straightforward solution: I have a <form> element that contains an file input element; its target is set to the ID of a hidden iframe. On the server side, there's some Spring magic that attaches an object to the user's session; the progress of the upload can be queried from this object. After submitting the form, I start a repeating Ajax call using setInterval that queries the server for the percent-complete using the aforementioned session object. The call repeats every half-second, skipping the Ajax call if the previous call has not yet completed. I use the data from the call to update the width of an onscreen element. When the server call reports that the upload is complete, I clear the interval timer. I created a 100-megabyte file and uploaded it using my interface. This is using Firefox 3.6.3. What I found is that although the upload takes 20-25 seconds, the progress bar doesn't get updated until the very end. Moreover, the entire browser is basically frozen until the upload completes. I assumed that my method must be flawed, but I tried the same page using IE6, and was utterly amazed when it behaved as I had designed it to--the progress bar got updated every half second, and the whole upload only took about 15 seconds, much faster than Firefox. I don't have many add-ons installed, but I tried disabling Firebug and restarting my browser. This marginally improved the performance--I got perhaps a single additional progress bar update mid-upload--but still far from acceptable. Can anyone tell me what I can do to bring Firefox's performance up to the level of IE6? Ugh, I can't believe I actually typed that. EDIT: I just tried uploading a large file from a Firefox 3.6.3 browser on a different machine than the one that's running my web server, and it worked fine. Huh.

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  • does overload operator-> a compile time action?

    - by Brent
    when I tried to compile the code: struct S { void func2() {} }; class O { public: inline S* operator->() const; private: S* ses; }; inline S* O::operator->() const { return ses; } int main() { O object; object->func(); return 0; } there is a compile error reported: D:\code>g++ operatorp.cpp -S -o operatorp.exe operatorp.cpp: In function `int main()': operatorp.cpp:27: error: 'struct S' has no member named 'func' it seems that invoke the overloaded function of "operator-" is done during compile time? I'd add "-S" option for compile only.

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  • Request/Response objects

    - by Dan
    I'm planning on using CXF's rest implementation. I'm thinking of simply annotating my entity classes with jaxb annotations, such as @XmlRootElement, in order to create response objects. The benefit being avoidance of code duplication. As for the (client) request object, which will be used by a separate web app, I'm thinking of 'copying' the entity classes, removing the orm annotations, and adding jaxb annotations. Based on the above: Are there any dangers of creating request/response objects from entity classes? My entity classes contain relational properties, if I were to annotate them with @XmlRootElement, how can I stop the relational properties from being added (or considered apart of) to the response object? Is there a better/easier way to create request objects rather than copying the entity classes, removing/adding annotations?

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  • .NET grouping forms so that pulling up the primary form shows all other forms?

    - by toasteroven
    I have an app that can open up some other forms at the user's request, and they're set to not show in the taskbar. The problem is, if one of the secondary windows becomes hidden by another app, switching to the primary window only brings that form to the forefront. Is there a good way to "group" the forms so that giving any of them focus brings the whole group to the front? I tried calling BringToFront() on each form in the primary form's Activated event, but that also gives the secondary forms focus, making it impossible to interact with the primary form.

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  • Is there a "concise" way to do namespacing in JavaScript?

    - by olliej
    I've frequently encountered sites that put all of their javascript inside a "namespace" structure along the lines of namespaces = { com : { example: { example.com's data} } But setting this up safely with respect to other namespaced frameworks seems to require a relatively hefty amount of code (defined as 2 lines). I was wondering whether anyone knows of a concise way to do this? and whether there's a relatively standard/consistent way to structure it? eg. is the "com" namespace directly attached to the global object, or is it attached through a namespace object? [Edit: whoops, obviously {com = { ... } } wouldn't accomplish anything close to what i intended, thanks to Shog9 for pointing that out. :D]

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  • Pulling .live() functionality out of jQuery

    - by Daniel
    I am writing a Firefox Add-On that currently is depending on jQuery for the following things: Selectors Animations A special .live("focus") hail-mary event-catching maneuver that happens to work with jQuery 1.4.2 (but not 1.4.4) jQuery isn't well suited for functioning inside XUL, and it's a miracle we've gotten this far with it. We're trying to remove the jQuery requirements, the first two are easy (animations are simple, and we can use .querySelector() instead of jQuery), but the .live has proven impossible to do on our own. I've tried reading the source code, but I haven't been able to piece it apart. What is the jQuery .live function doing? There's clearly a lot more going on than document.addEventListener("focus"/"focusin",function_to_pick_apart_events). What else is going on here?

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  • Is it possible to use the values method for a HashMap if the values are ArrayLists?

    - by Denman
    I'm stuck trying to get something to work in an assignment. I have a HashMap<Integer, ArrayList<Object>> called sharedLocks and I want to check whether a certain value can be found in any ArrayList in the HashMap. The following code obviously wouldn't work because Object[] can't be cast to ArrayList[], but it is a demonstration of the general functionality that I want. ArrayList[] values = (ArrayList[]) sharedLocks.values().toArray(); boolean valueExists = false; for (int i = 0; i < values.length; i++) { if (values[i].contains(accessedObject)) { valueExists = true; } } Is there a way for me to check every ArrayList in the HashMap for a certain value? I'm not sure how to use the values method for HashMaps in this case. Any help would be much appreciated.

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  • how does selenium webdriver upload files to the browser?

    - by justspamjustin
    I am a javascript/java developer and I have been trying to figure out how the selenium webdriver automation framework uploads files from the file system. It is impossible to set a file input via javascript because it is a security violation. Yet somehow webdriver is able to do this with the following command: driver.setFileDetector(new LocalFileDetector()); WebElement upload = driver.findElement(By.id("myfile")); upload.sendKeys("/Users/sso/the/local/path/to/darkbulb.jpg"); driver.findElement(By.id("submit")).click(); So they are setting the value by sending keys to it? I don't get it. I have looked through the source code found here: http://code.google.com/p/selenium/source/checkout I am still not able to find where they do this. Edit: My question is not how to do this with selenium, but how did the selenium developers make this possible? How did they get around the security restrictions in javascript? How are they uploading the file?

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  • Core Data-Linking one-to-many relationships

    - by Stelmate
    I have a one-to-many relationship where each department has many employees. When I create a new employee object I just link it to the parent department manually by setting the property to the instance of the department I have fetched from my fetch request. However, this seems to be improper because when I try to access the set of employees from the department by simply accessing the .employees property on my department object instance it returns a 0 count. Isn't the fault suppose to fire once I access a property? Am I linking my parent/child objects incorrectly?

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  • living column in instruments

    - by dubbeat
    In the context of allocations what exactly does the living column mean? Does it mean the number of times an object was created or does it mean how many instances of an object there is? I ask because I'm testing going in and out of a view. When I enter the view I create a class "myClass". When I exit the view I nil "myClass" and release it. If I go in and out of the view 6 times for example the living column in instruments for "myClass" says 6. Is this normal or is it not being released properly?

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  • A generic list of generics

    - by SnOrfus
    I'm trying to store a list of generic objects in a generic list, but I'm having difficulty declaring it. My object looks like: public class Field<T> { public string Name { get; set; } public string Description { get; set; } public T Value { get; set; } /* ... */ } I'd like to create a list of these. My problem is that each object in the list can have a separate type, so that the populated list could contain something like this: { Field<DateTime>, Field<int>, Field<double>, Field<DateTime> } So how do I declare that? List<Field<?>> (I'd like to stay as typesafe as possible, so I don't want to use an ArrayList).

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  • How do I reference a pointer from a different class?

    - by Justagruvn
    First off, I despise singletons with a passion. Though I should probably be trying to use one, I just don't want to. I want to create a data class (that is instantiated only once by a view controller on loading), and then using a different class, message the crap out of that data instance until it is brimming with so much data, it smiles. So, how do I do that? I made a pointer to the instance of the data class when I instantiated it. I'm now over in a separate view controller, action occurs, and I want to update the initial data object. I think I need to reference that object by way of pointer, but I have no idea how to do that. Yes, I've set properties and getters and setters, which seem to work, but only in the initial view controller class. Peace Love applesauce.

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  • TDBGrid columns design time or run time?

    - by Mawg
    I am using TDBGrid for the first time. I didn't even notice the Columns property in the object inspector and everything went just fine: the grid was filled. Then I saw the Columns property and tried it. When I use the object insector to add items to the Columns property of the grid, they do not all of them show up at run time. To me, it looks like the FieldName property is important. It looks like it is correct, but there are no values in some columns. If I leave this property blank (no columns at all) it seems that the control populates it itself at run time and I do see all the columns. I could live with that. When I set column titles at run time it works, but setting column width does not.

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  • Call inner function of jQuery-Plugin-function?

    - by faileN
    Hello Everyone, I've written an jQuery-Plugin, which I want to use as Object. So I declared some functions within the plugin, which I want to call from any other location, just like an object with methods. Is that even possible? To keep it simple: (function( $ ){ $.fn.myPlugin = function(){ // Here I want methods... function foo() { // do something... } } })(jQuery); Then I want to call the inner function from outside the plugin like: $.myPlugin.foo(); But that doesn't seem to work. So is it even possible? Or are there any other solutions? I don't want to use an normal unrelated jQuery-Class for this purpose. Because this plugin should work together with some other jQuery-Plugins. Thank you

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  • C++: Is there a way to limit access to certain methods to certain classes without exposing other pri

    - by dadads
    I have a class with a protected method Zig::punt() and I only want it to be accessible to the class "Avocado". In C++, you'll normally do this using the "friend Avocado" specifier, but this will cause all of the other variables to become accessible to "Avocado" class; I don't want this because this breaks encapsulation. Is what I want impossible, or does there already exist an obscure trick out there that I can use to achieve what I want? Or possibly alternative class design patterns that'll achieve the same thing? Thanks in advance for any ideas!

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  • Send a String[] ArrayList over Socket connection

    - by Duncan Palmer
    So i'm trying to send a String[] Array/List over an open socket connection. I currently have this code: Sending: public void sendData() { try { OutputStream socketStream = socket.getOutputStream(); ObjectOutputStream objectOutput = new ObjectOutputStream(socketStream); objectOutput.writeObject(new String[] {"Test", "Test2", "Test3"}); objectOutput.close(); socketStream.close(); } catch (Exception e) { System.out.println(e.toString()); } } Recieving: public Object readData() { try { InputStream socketStream = socket.getInputStream(); ObjectInputStream objectInput = new ObjectInputStream(new GZIPInputStream(socketStream)); Object a = objectInput.readObject(); return a; } catch(Exception e) { return null; } } After I have recieved the String array/list on the other end I want to be able to iterate through it like I would do normally so I can get the values. My current code doesn't seem to works as it returns null as the value. is this possible?

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  • Gridview SortExpression with 2 fields

    - by aron
    Hello, I have a GridView that get's its datasource from a complex object. So I'm doing the Sorting & Paging in the code behind. <asp:GridView ID="SystemsDetailList" runat="server" AllowSorting="true" AllowPaging="true" AutoGenerateColumns="False" ShowFooter="True" OnPageIndexChanging="gridView_PageIndexChanging" OnSorting="gridView_Sorting"> For an important title column I have a SortExpression with 2 fields: SortExpression="FunctionalAreaDisplayCode, EswbsDisplayCode" This in the code behind: protected void gridView_Sorting(object sender, GridViewSortEventArgs e) { BindSystemList(e.SortExpression, sortOrder); } public string sortOrder { get { if (ViewState["sortOrder"].ToString() == "desc") { ViewState["sortOrder"] = "asc"; } else { ViewState["sortOrder"] = "desc"; } return ViewState["sortOrder"].ToString(); } set { ViewState["sortOrder"] = value; } } For some reason it will keep "FunctionalAreaDisplayCode" always sorted ASC but the EswbsDisplayCode works fine as it flips between ASC and DESC correctly. and tips here? thanks!

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  • php string search - grabbing specific urls

    - by MEM
    Hello, I have this string that may contain some urls that I need to grab. For instance, if the user does: www.youtube ... or www.vimeo ... or http://www.youtube ... or HttP://WwW.viMeo I need to grab it (until he finds a space perhaps). and store it on a already created array. The need is to separate the vimeo links from the youtube ones and place each of those on the appropriate video object. I'm not sure if this is possible, I mean, if the URL coming from the browser could be used to be placed on a predefined video object. If it is, then this is the way to go (so I believe). If all this is feasible, can I have your help in order to build such a rule? Thanks in advance

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  • Communication between c++ objects.

    - by Pradyot
    This is an issue, that I have come acrosss earlier. Basically a c++ object has a member object that does some work, once the work is done , a notification needs to made to the parent. What is the most elegant solution to allow this communication. Does being in this position indicate a flaw with the design to begin with? To elaborate. class A { B member; void do_something(); } class B{ void talk_to_network(); }; void do_something() { //Conditional wait on a variable that will change when talk to network completes. //So need a way for B to inform A, that it is done. }

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  • How can i add column name in list generic?

    - by Phsika
    class MyExcelSheets { public List MyColumnNames { get; set; } } how can i add Excel data's column name in "List MyColumnNames ". it returns to me Object reference not set to an instance of an object. i want to use above class in: myexcelSheet = new MyExcelSheets(); myexcelSheet.MyColumnNames = new MyExcelSheets().MyColumnNames; foreach (DataColumn col in dTable.Columns) myexcelSheet.MyColumnNames.Add(col.ColumnName.ToString()); How can i solve it? Error: NullReferenceException

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  • Reverse Search Best Practices?

    - by edub
    I'm making an app that has a need for reverse searches. By this, I mean that users of the app will enter search parameters and save them; then, when any new objects get entered onto the system, if they match the existing search parameters that a user has saved, a notification will be sent, etc. I am having a hard time finding solutions for this type of problem. I am using Django and thinking of building the searches and pickling them using Q objects as outlined here: http://www.djangozen.com/blog/the-power-of-q The way I see it, when a new object is entered into the database, I will have to load every single saved query from the db and somehow run it against this one new object to see if it would match that search query... This doesn't seem ideal - has anyone tackled such a problem before?

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