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  • Bind a java class as a closure into a groovy-script

    - by chrsk
    Is it possible to bind a closure written in java into a groovy-script. Is there an interface or something to implement so i can provide a closure? Something like this? public class Example implements Closure { public void closure(Object... args) { System.out.println(args[0]); } } Bind this into the groovyscript. Binding binding = new Binding(); binding.put("example", new Example()); groovyScriptEngine.run("foo.groovy", binding) and use it in the foo.groovy like this: example("Hello World")

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  • Epoch is not epoch if do a new Date(0L). Why ?

    - by Antoine Claval
    My problem is pretty straigtforward explained : if i do this : public class Main { public static void main(String[] args) throws Exception { Date d = new Date(0L ); System.out.println(d); } } I get the following output : Thu Jan 01 01:00:00 CET 1970 According to the doc, i was expecting : Thu Jan 01 00:00:00 CET 1970 I would like was going wrong... EDIT : Indeed, i read the doc too fast. I sould have Thu Jan 01 00:00:00 GMT 1970 So, how can i force the use of GMT, and ignore all local time ?

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  • Java - Collections.binarySearch with PriorityQueue?

    - by msr
    Hello, Can I use Collections.binarySearch() method to search elements in a PriorityQueue? Otherwise, how can I apply search algorithms to a PriorityQueue? I have this (class Evento implements Comparable): public class PriorityQueueCAP extends PriorityQueue<Evento>{ // (...) public void removeEventos(Evento evento){ Collections.binarySearch(this, evento); // ERROR! } } And I got this error: "The method binarySearch(List, T) in the type Collections is not applicable for the arguments (PriorityQueueCAP, Evento)" Why? Thanks in advance!

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  • Custom Windows Forms Control not exporting functions, not showing in tools list, showing as Text

    - by flavour404
    Hi, I have written a very simple control. C# Visual Studio 2008. Its output should be, and is a dll. I have added a reference to the dll within the project that I intend to use it with. The msdn article about how to write a control states that it should appear in the 'Add reference / projects' list, which it doesn't but I simply navigated to it under the 'browse' tab, went to the /bin folder and added the reference that way. I dragged it over to my toolbox, but it shows up as a 'Text:xhair_tool' and when i try and add it to a form, it won't, so what have I done wrong? It was created as a 'Windows forms control' project. It should export the one method which is 'Target' which return an array, as shown below. using System; using System.Collections.Generic; using System.ComponentModel; using System.Drawing; using System.Data; using System.Text; using System.Windows.Forms; namespace xhair_tool { public partial class xhair : UserControl { public xhair() { InitializeComponent(); } private void xhair_Load(object sender, EventArgs e) { } protected override void OnPaint(PaintEventArgs e) { Graphics g = e.Graphics; Pen pen = new Pen(Color.Black, 1); SolidBrush redBrush = new SolidBrush(Color.Red); g.DrawLine(pen, 8, 0, 8, 7); g.DrawLine(pen, 8, 9, 8, 16); g.DrawLine(pen, 0, 8, 7, 8); g.DrawLine(pen, 9, 8, 16, 8); //ControlPaint.DrawReversibleLine(start, end, backColor) } /// <summary> /// Returns the point at the center of the crosshair /// </summary> /// <returns>int[x,y]</returns> public int[] Target { get { int[] _xy = new int[2]; _xy[0] = this.Left + 8; _xy[1] = this.Top + 8; return _xy; } } } } Thanks, R.

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  • Java add leading zeros to a number....

    - by user69514
    I need to return a string in the form xxx-xxxx where xxx is a number and xxxx is another number, however when i have leading zeros they disappear. I'm trying number formatter, but it's not working. public String toString(){ NumberFormat nf3 = new DecimalFormat("#000"); NumberFormat nf4 = new DecimalFormat("#0000"); if( areaCode != 0) return nf3.format(areaCode) + "-" + nf3.format(exchangeCode) + "-" + nf4.format(number); else return exchangeCode + "-" + number; } } I figured it out: public String toString(){ NumberFormat nf3 = new DecimalFormat("000"); NumberFormat nf4 = new DecimalFormat("0000"); if( areaCode != 0) //myFormat.format(new Integer(someValue)); return nf3.format(new Integer(areaCode)) + "-" + nf3.format(new Integer(exchangeCode)) + "-" + nf4.format(new Integer(number)); else return nf3.format(new Integer(exchangeCode)) + "-" + nf4.format(new Integer(number)); }

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  • Some more multitasking java issues

    - by owca
    I had a task to write simple game simulating two players picking up 1-3 matches one after another until the pile is gone. I managed to do it for computer choosing random value of matches but now I'd like to go further and allow humans to play the game. Here's what I already have : http://paste.pocoo.org/show/200660/ Class Player is a computer player, and PlayerMan should be human being. Problem is, that thread of PlayerMan should wait until proper value of matches is given but I cannot make it work this way. When I type the values it sometimes catches them and decrease amount of matches but that's not exactly what I was up to :) Logics is : I check the value of current player. If it corresponds to this of the thread currently active I use scanner to catch the amount of matches. Else I wait one second (I know it's kinda harsh solution, but I have no other idea how to do it). Class Shared keeps the value of current player, and also amount of matches. By the way, is there any way I can make Player and Shared attributes private instead of public and still make the code work ? CONSOLE and INPUT-DIALOG is just for choosing way of inserting values. class PlayerMan extends Player{ static final int CONSOLE=0; static final int INPUT_DIALOG=1; private int input; public PlayerMan(String name, Shared data, int c){ super(name, data); input = c; } @Override public void run(){ Scanner scanner = new Scanner(System.in); int n = 0; System.out.println("Matches on table: "+data.matchesAmount); System.out.println("which: "+data.which); System.out.println("number: "+number); while(data.matchesAmount != 0){ if(number == data.which){ System.out.println("Choose amount of matches (from 1 to 3): "); n = scanner.nextInt(); if(data.matchesAmount == 1){ System.out.println("There's only 1 match left !"); while(n != 1){ n = scanner.nextInt(); } } else{ do{ n = scanner.nextInt(); } while(n <= 1 && n >= 3); } data.matchesAmount = data.matchesAmount - n; System.out.println(" "+ name+" takes "+n+" matches."); if(number != 0){ data.which = 0; } else{ data.which = 1; } } else{ try { Thread.sleep(1000); } catch(InterruptedException exc) { System.out.println("End of thread."); return; } } System.out.println("Matches on table: "+data.matchesAmount); } if(data.matchesAmount == 0){ System.out.println("Winner is player: "+name); stop(); } } }

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  • Nexus: removing repository

    - by David
    Hi, I accidently removed a hosted snapshot repository from Nexus containing a few artifacts needed by other developers on my team. Fine, I'll be able to recreate it fairly easy, but when I tried to add the repository again with the same name as the one I removed, the "Upload Artifact" tab did not show. I tried to clean the cache and reindex the public and public snapshot repos, but that didn't help. I also tried setting an alternative storage path by entering an alternative path on "Override Local Storage Location", same result. Will I have to create a brand new repository with a different name and change all repository reference in my projects? Thanks, David

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  • What does this error states in asp.net-mvc?

    - by Pandiya Chendur
    I have repository class in asp.net mvc which has this, public Material GetMaterial(int id) { return db.Materials.SingleOrDefault(m => m.Mat_id == id); } And my controller has this for details action result, ConstructionRepository consRepository = new ConstructionRepository(); public ActionResult Details(int id) { Material material = consRepository.GetMaterial(id); return View(); } But why i get this error, The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ActionResult Details(Int32)' in 'CrMVC.Controllers.MaterialsController'. To make a parameter optional its type should be either a reference type or a Nullable type. Parameter name: parameters Any suggestion...

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  • How long does it take to iterate through a long loop?

    - by Carl Rosenberger
    On a modern 64-Bit machine, how long do you think it takes to iterate through all the positive long numbers? Below is a code snippet in Java to demonstrate the idea. Without running the code yourself, how long do you think this code is going to run? How long will similar code run in other programming languages? public class LongLoop { public static void main(String[] args) { long startTime = System.currentTimeMillis(); for (long i = 0; i < Long.MAX_VALUE; i++) { // do nothing, just loop } long stopTime = System.currentTimeMillis(); long duration = stopTime - startTime; System.out.println("Time taken: " + duration + " milliseconds"); } }

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  • Problem applying data annotation in asp.net mvc2

    - by Fraz Sundal
    Im facing problem when trying to apply data annotation. In my case im passing FormCollection in controller [HttpPost] public ActionResult Create(string Button, FormCollection collection) { if (ModelState.IsValid) { } else { } } and in ModelState.IsValid condition always have true value. Although i have left some blank fields in View. Also EnableClientValidation() is also applied in View for client side validation but its not working. what may be the problem

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  • Dynamic Linq help, different errors depending on object passed as parameter?

    - by sah302
    I have an entityDao that is inherbited by everyone of my objectDaos. I am using Dynamic Linq and trying to get some generic queries to work. I have the following code in my generic method in my EntityDao : public abstract class EntityDao<ImplementationType> where ImplementationType : Entity { public ImplementationType getOneByValueOfProperty(string getProperty, object getValue){ ImplementationType entity = null; if (getProperty != null && getValue != null) { LCFDataContext lcfdatacontext = new LCFDataContext(); //Generic LINQ Query Here entity = lcfdatacontext.GetTable<ImplementationType>().Where(getProperty + " =@0", getValue).FirstOrDefault(); //.Where(getProperty & "==" & CStr(getValue)) } //lcfdatacontext.SubmitChanges() //lcfdatacontext.Dispose() return entity; } }         Then I do the following method call in a unit test (all my objectDaos inherit entityDao): [Test] public void getOneByValueOfProperty() { Accomplishment result = accomplishmentDao.getOneByValueOfProperty("AccomplishmentType.Name", "Publication"); Assert.IsNotNull(result); } The above passes (AccomplishmentType has a relationship to accomplishment) Accomplishment result = accomplishmentDao.getOneByValueOfProperty("Description", "Can you hear me now?"); Accomplishment result = accomplishmentDao.getOneByValueOfProperty("LocalId", 4); Both of the above work Accomplishment result = accomplishmentDao.getOneByValueOfProperty("Id", New Guid("95457751-97d9-44b5-8f80-59fc2d170a4c"))       Does not work and says the following: Operator '=' incompatible with operand types 'Guid' and 'Guid Why is this happening? Guid's can't be compared? I tried == as well but same error. What's even moreso confusing is that every example of Dynamic Linq I have seen simply usings strings whether using the parameterized where predicate or this one I have commented out: //.Where(getProperty & "==" & CStr(getValue)) With or without the Cstr, many datatypes don't work with this format. I tried setting the getValue to a string instead of an object as well, but then I just get different errors (such as a multiword string would stop comparison after the first word). What am I missing to make this work with GUIDs and/or any data type? Ideally I would like to be able to just pass in a string for getValue (as I have seen for every other dynamic LINQ example) instead of the object and have it work regardless of the data Type of the column.

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  • who do you admire in a scientific/technical field [closed]

    - by Tshepang
    This off-topic item refers to people with major achievements in fields such as engineering, science, and mathematics. Here's my picks: Eric Drexler for his work on molecular nanotech. His book, Engines of Creations, is mind-blowing. Robert Freitas for his work on molecular nanotech. The breadth of his multi-volume book, Nanomedicine, is impressive. Richard Stallman for promoting Free Software.

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  • Why can final object be modified?

    - by Matt McCormick
    I came across the following code in a code base I am working on: public final class ConfigurationService { private static final ConfigurationService INSTANCE = new ConfigurationService(); private List providers; private ConfigurationService() { providers = new ArrayList(); } public static void addProvider(ConfigurationProvider provider) { INSTANCE.providers.add(provider); } ... INSTANCE is declared as final. Why can objects be added to INSTANCE? Shouldn't that invalidate the use of final. (It doesn't). I'm assuming the answer has to do something with pointers and memory but would like to know for sure.

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  • raising a vb6 event using interop

    - by Steve
    Hi, I have a legacy VB6 component that I've imported into VS using tlbimp.exe to generate my interop assembly. The VB6 component defines an event that allows me to pass messages within VB6. Public Event Message(ByVal iMsg As Variant, oCancel As Variant) I would really like to be able to raise this even in my C# program, but its getting imported as an event, not a delegate or something else useful. So, I can only listen, but never fire. Does anyone know how to fire an event contained within VB6? The C# event looks like [TypeLibType(16)] [ComVisible(false)] public interface __MyObj_Event { event __MyObj_MessageEventHandler Message; } I unfortunately cannot change the VB6 code. Thanks.

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  • LB_SETTABSTOPS does not appear to affect a CheckedListBox

    - by BP
    I am trying to set tab stops in a CheckedListBox in my WinForms application, but no matter what I do, it does not seem to have any effect. I have the following in the code for my form: <DllImport("user32.dll")> _ Public Sub SendMessage(ByVal hWnd As IntPtr, ByVal uMsg As Int32, ByVal wParam As Int32, ByRef lParam As Int32) End Sub Public Const LB_SETTABSTOPS As Int32 = &H192 And in the form's load method, I am doing the following, where theList is my CheckedListBox: Dim tabStops() As Integer = {40, 140, 240} Call SendMessage(theList.Handle, LB_SETTABSTOPS, tabStops.Length, tabStops(0)) theList.Refresh() And then later on, I use this in a loop, where col1 through col4 are all string values for the columns: theList.Items.Add(col1 & vbTab & col2 & vbTab & col3 & vbTab & col4) But no matter what I use for the values of tabStops, the list is formatted with standard width tab stops.

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  • Is yield break equivalent to returning Enumerable<T>.Empty from a method returning IEnumerable<T>

    - by Mike Two
    These two methods appear to behave the same to me public IEnumerable<string> GetNothing() { return Enumerable.Empty<string>(); } public IEnumerable<string> GetLessThanNothing() { yield break; } I've profiled each in test scenarios and I don't see a meaningful difference in speed, but the yield break version is slightly faster. Are there any reasons to use one over the other? Is one easier to read than the other? Is there a behavior difference that would matter to a caller?

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  • WPF Custom Control - Designer looks fine, but I get a runtime issue...

    - by myermian
    MainWindow.xaml <Window x:Class="MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:my="clr-namespace:MyStuff;assembly=MyStuff" Title="MainWindow" Height="350" Width="525"> <Grid> <TabControl Margin="5"> <TabItem Header="Start Page" /> <my:XTabItem Header="Tab 1" Image="Resources/icon1.png" /> </TabControl> </Grid> </Window> Generic.xaml <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:MyStuff" > <!-- XTabItem --> <Style TargetType="{x:Type local:XTabItem}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type local:XTabItem}"> <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}"> <StackPanel Orientation="Horizontal"> <Image Source="{Binding Path=Image, RelativeSource={RelativeSource TemplatedParent}}" Stretch="UniformToFill" MaxHeight="24" /> <TextBlock Text="{TemplateBinding Header}" /> <Button Content="X" /> </StackPanel> </Border> </ControlTemplate> </Setter.Value> </Setter> </Style> </ResourceDictionary> XTabItem.cs using System; using System.ComponentModel; using System.Windows; using System.Windows.Controls; using System.Windows.Media; namespace MyStuff { public class XTabItem : TabItem { #region Dependency Properties public static readonly DependencyProperty ImageProperty; #endregion #region Constructors / Initializer static XTabItem() { //Initialize the control as "lookless". DefaultStyleKeyProperty.OverrideMetadata(typeof(XTabItem), new FrameworkPropertyMetadata(typeof(XTabItem))); //Setup the dependency properties. ImageProperty = DependencyProperty.Register("Image", typeof(ImageSource), typeof(XTabItem), new UIPropertyMetadata(null)); } #endregion #region Custom Control Properties (Image) /// <summary> /// The image (icon) displayed by inside the tab header. /// </summary> /// <remarks>The image is specified in XAML as an absolute or relative path.</remarks> [Description("The image displayed by the button"), Category("Optional Properties")] public ImageSource Image { get { return (ImageSource)GetValue(ImageProperty); } set { SetValue(ImageProperty, value); } } #endregion } } Exception at line #9 () : XamlParseException : 'Provide value on 'System.Windows.Baml2006.TypeConverterMarkupExtension' threw an exception.' Line number '9' and line position '27'.

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  • why it throws java.lang.classCastException

    - by matin1234
    Hi this is my class and I want to sort my stack but it will throw an exception please help me thanks! public class jj { public static void main(String[] args){ Stack<Integer> s = new ImplimentingAStackUsingAnArrayOfAGivenSizeN(5); s.push(1); s.push(3); s.push(5); s.push(2); s.push(4); Collections.sort((List<Integer>) (s)); System.out.println(s); while (!s.isEmpty()) { System.out.println(s.pop()); } } } the stack traces: run: Exception in thread "main" java.lang.ClassCastException: datastructurechapter5.ImplimentingAStackUsingAnArrayOfAGivenSizeN cannot be cast to java.util.List at datastructurechapter5.jj.main(jj.java:24) `Collections.sort((List<Integer>) (s));` Java Result: 1 BUILD SUCCESSFUL (total time: 2 seconds)

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  • Static Javascript files not loaded in Express app

    - by Dave Long
    I have an express app that has a bunch of static javascript files that aren't being loaded even though they are registered in my app.js file. Even public scripts (like jQuery: http://ajax.googleapis.com/ajax/libs/jquery/1.6.3/jquery.min.js) aren't processing. I can see the script tags in the generated html, but none of the functionality runs and I can't see the files loading in the web inspector. Here is the code that I have: app.js var express = require('express') var app = module.exports = express.createServer(); // Configuration var port = process.env.PORT || 3000; app.configure(function(){ app.set('views', __dirname + '/views'); app.set('view engine', 'jade'); app.use(express.bodyParser()); app.use(express.methodOverride()); app.use(app.router); app.use(express.static(__dirname + '/public')); }); app.configure('development', function(){ app.use(express.errorHandler({ dumpExceptions: true, showStack: true })); }); app.configure('production', function(){ app.use(express.errorHandler()); }); // Routes app.get('/manage/new', function(req, res){ res.render('manage/new', { title: 'Create a new widget' }); }) app.listen(port); console.log("Express server listening on port %d in %s mode", app.address().port, app.settings.env); /views/manage/layout.jade !!! 5 html(lang="en") head title= title link(rel="stylesheet", href="/stylesheets/demo.css") link(rel="stylesheet", href="/stylesheets/jquery.qtip.css") script(type="text/javascript", href="http://ajax.googleapis.com/ajax/libs/jquery/1.6.3/jquery.min.js") body!= body script(type="text/javascript", href="/javascripts/jquery.formalize.js") script(type="text/javascript", href="/javascripts/jquery.form.js") script(type="text/javascript", href="/javascripts/jquery.qtip.js") script(type="text/javascript", href="/javascripts/formToWizard.js") script(type="text/javascript", href="/javascripts/widget.js") /views/manage/new.jade h1= title div(style="float:left;") form(action="/manage/generate", method="post", enctype="multipart/form-data", name="create-widget") .errors fieldset legend Band / Album Information fieldset legend Social Networks fieldset legend Download All of my javascript files are stored in /public/javascripts and all of my static CSS files are being served up just fine. I'm not sure what I've done wrong.

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  • Dynamic Linq Library Help

    - by Alon
    Hi, I have the following class: public class Item { public Dictionary<string, string> Data { get; set; } } and a list of it: List<Item> items; I need to filter and order this list dynamicly using SQL-Like strings. The catch is, that I need to order it by the Data dictionary. For example: Order By Data["lastname"] or Where Data["Name"].StartsWith("a"). I thought to use the dynamic linq library, but is there any way that my clients can write without the Data[]? For example: Name.StartsWith("abc") instead of Data["Name"].StartsWith("abc") ? Thank you.

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  • Qt4: QMenuBar/QMenu doesn't show up on Mac OS X

    - by Erick
    Hello, I'm having difficulties to make a QMenuBar display a QMenu with a QAction under Mac OS X (Snow Leopard). Here is the code I'm using for creating the menu: void ClientWindow::setUpMenu () { QMenu * file = menuBar()->addMenu("&File"); QAction * quit = new QAction("&Quit", this); file->addAction(quit); connect(quit, SIGNAL(triggered()), this, SLOT(quit())); } Here is the ClientWindow class interface: class ClientWindow : public QMainWindow { public: ClientWindow (QWidget * parent = 0); void setUpMenu (); }; And here is my main() method: int main (int argc, char * argv[]) { QApplication app(argc, argv); ClientWindow window; window.setUpMenu(); window.show(); return app.exec(); } Any ideas why it wouldn't show up on the menu bar? Thank you all.

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  • Disposing of Objects with long living dependencies

    - by Ray Booysen
    public class ABC { public ABC(IEventableInstance dependency) { dependency.ANewEvent += MyEventHandler; } private void MyEventHandler(object sender, EventArgs e) { //Do Stuff } } Let us say that an instance of ABC is a long living object and that my dependency is an even longer running object. When an instance of ABC needs to be cleaned up, I have two options. One I could have a Cleanup() method to unsubscribe from the ANewEvent event or I could implement IDisposable and in the Dispose unwire the event. Now I have no control over whether the consumer will call the dispose method or even the Cleanup method should I go that route. Should I implement a Finaliser and unsubscribe then? It feels dirty but I do not want hanging instances of ABC around. Thoughts?

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  • how to add enum value to list

    - by netmajor
    I have enum: public enum SymbolWejsciowy { K1 , K2 , K3 , K4 , K5 , K6 , K7 , K8 } and I want to create list of this enum public List<SymbolWejsciowy> symbol; but in my way to add enum to List: 1. SymbolWejsciowy symbol ; symbol.Add(symbol = SymbolWejsciowy.K1); 2. symbol.Add(SymbolWejsciowy.K1); I always get Exception Object reference not set to an instance of an object. What i do wrong :/ Please help :)

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  • Cannot load JRubyEngine because org.apache.bsf.util.BSFEngineImpl not found

    - by Ceilingfish
    Hi, I'm trying to use JRuby in a custom application, and I don't seem to be able to load the JRubyEngine object. My class looks like functionally similar to this: public class ScriptEngine { private static ScriptEngine engine = new JRubyEngine(); public void run(final String script, final Map<String,Object> input) { final Bindings context = engine.createBindings(); context.putAll(input); try { engine.eval(script,context); } catch (ScriptException e) { log.error("Failed to execute script: "+getScript(),e); } } } However this fails at compilation with the complaint: [javac] Compiling 486 source files to /workspace/myProject/build/src [javac] /workspace/myProject/src/net/ceilingfish/ScriptEngine.java:31: cannot access org.apache.bsf.util.BSFEngineImpl [javac] class file for org.apache.bsf.util.BSFEngineImpl not found [javac] private static ScriptEngine engine = new JRubyEngine(); [javac] ^ [javac] 1 error Does anyone have any insights on where I can get this class from? Or if there is a better way to be instantiating a JRubyEngine object.

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