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  • .NET EventHandlers - Generic or no?

    - by Chris Marasti-Georg
    Every time I start in deep in a C# project, I end up with lots of events that really just need to pass a single item. I stick with the EventHandler/EventArgs practice, but what I like to do is have something like: public delegate void EventHandler<T>(object src, EventArgs<T> args); public class EventArgs<T>: EventArgs { private T item; public EventArgs(T item) { this.item = item; } public T Item { get { return item; } } } Later, I can have my public event EventHandler<Foo> FooChanged; public event EventHandler<Bar> BarChanged; However, it seems that the standard for .NET is to create a new delegate and EventArgs subclass for each type of event. Is there something wrong with my generic approach? EDIT: The reason for this post is that I just re-created this in a new project, and wanted to make sure it was ok. Actually, I was re-creating it as I posted. I found that there is a generic EventHandler<TEventArgs, so you don't need to create the generic delegate, but you still need the generic EventArgs<T class, because TEventArgs: EventArgs. Another EDIT: One downside (to me) of the built-in solution is the extra verbosity: public event EventHandler<EventArgs<Foo>> FooChanged; vs. public event EventHandler<Foo> FooChanged; It can be a pain for clients to register for your events though, because the System namespace is imported by default, so they have to manually seek out your namespace, even with a fancy tool like Resharper... Anyone have any ideas pertaining to that?

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  • Are PyArg_ParseTuple() "s" format specifiers useful in Python 3.x C API?

    - by Craig McQueen
    I'm trying to write a Python C extension that processes byte strings, and I have something basically working for Python 2.x and Python 3.x. For the Python 2.x code, near the start of my function, I currently have a line: if (!PyArg_ParseTuple(args, "s#:in_bytes", &src_ptr, &src_len)) ... I notice that the s# format specifier accepts both Unicode strings and byte strings. I really just want it to accept byte strings and reject Unicode. For Python 2.x, this might be "good enough"--the standard hashlib seems to do the same, accepting Unicode as well as byte strings. However, Python 3.x is meant to clean up the Unicode/byte string mess and not let the two be interchangeable. So, I'm surprised to find that in Python 3.x, the s format specifiers for PyArg_ParseTuple() still seem to accept Unicode and provide a "default encoded string version" of the Unicode. This seems to go against the principles of Python 3.x, making the s format specifiers unusable in practice. Is my analysis correct, or am I missing something? Looking at the implementation for hashlib for Python 3.x (e.g. see md5module.c, function MD5_update() and its use of GET_BUFFER_VIEW_OR_ERROUT() macro) I see that it avoids the s format specifiers, and just takes a generic object (O specifier) and then does various explicit type checks using the GET_BUFFER_VIEW_OR_ERROUT() macro. Is this what we have to do?

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  • Lucene HTMLFormatter skipping last character

    - by Midhat
    I have this simple Lucene search code (Modified from http://www.lucenetutorial.com/lucene-in-5-minutes.html) class Program { static void Main(string[] args) { StandardAnalyzer analyzer = new StandardAnalyzer(); Directory index = new RAMDirectory(); IndexWriter w = new IndexWriter(index, analyzer, true, IndexWriter.MaxFieldLength.UNLIMITED); addDoc(w, "Table 1 <table> content </table>"); addDoc(w, "Table 2"); addDoc(w, "<table> content </table>"); addDoc(w, "The Art of Computer Science"); w.Close(); String querystr = "table"; Query q = new QueryParser("title", analyzer).Parse(querystr); Lucene.Net.Search.IndexSearcher searcher = new Lucene.Net.Search.IndexSearcher(index); Hits hitsFound = searcher.Search(q); SimpleHTMLFormatter formatter = new SimpleHTMLFormatter("*", "*"); Highlighter highlighter = null; highlighter = new Highlighter(formatter, new QueryScorer(searcher.Rewrite(q))); for (int i = 0; i < hitsFound.Length(); i++) { Console.WriteLine(highlighter.GetBestFragment(analyzer, "title", hitsFound.Doc(i).Get("title"))); // Console.WriteLine(hitsFound.Doc(i).Get("title")); } Console.ReadKey(); } private static void addDoc(IndexWriter w, String value) { Document doc = new Document(); doc.Add(new Field("title", value, Field.Store.YES, Field.Index.ANALYZED)); w.AddDocument(doc); } } The highlighted results always seem to skip the closing '' of my last table tag. Any suggestions?

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  • Grails - Simple hasMany Problem - How does 'save' work?

    - by gav
    My problem is this: I want to create a grails domain instance, defining the 'Many' instances of another domain that it has. I have the actual source in a Google Code Project but the following should illustrate the problem. class Person { String name static hasMany[skills:Skill] static constraints = { id (visible:false) skills (nullable:false, blank:false) } } class Skill { String name String description static constraints = { id (visible:false) name (nullable:false, blank:false) description (nullable:false, blank:false) } } If you use this model and def scaffold for the two Controllers then you end up with a form like this that doesn't work; My own attempt to get this to work enumerates the Skills as checkboxes and looks like this; But when I save the Volunteer the skills are null! This is the code for my save method; def save = { log.info "Saving: " + params.toString() def skills = params.skills log.info "Skills: " + skills def volunteerInstance = new Volunteer(params) log.info volunteerInstance if (volunteerInstance.save(flush: true)) { flash.message = "${message(code: 'default.created.message', args: [message(code: 'volunteer.label', default: 'Volunteer'), volunteerInstance.id])}" redirect(action: "show", id: volunteerInstance.id) log.info volunteerInstance } else { render(view: "create", model: [volunteerInstance: volunteerInstance]) } } This is my log output (I have custom toString() methods); 2010-05-10 21:06:41,494 [http-8080-3] INFO bumbumtrain.VolunteerController - Saving: ["skills":["1", "2"], "name":"Ian", "_skills":["", ""], "create":"Create", "action":"save", "controller":"volunteer"] 2010-05-10 21:06:41,495 [http-8080-3] INFO bumbumtrain.VolunteerController - Skills: [1, 2] 2010-05-10 21:06:41,508 [http-8080-3] INFO bumbumtrain.VolunteerController - Volunteer[ id: null | Name: Ian | Skills [Skill[ id: 1 | Name: Carpenter ] , Skill[ id: 2 | Name: Sound Engineer ] ]] Note that in the final log line the right Skills have been picked up and are part of the object instance. When the volunteer is saved the 'Skills' are ignored and not commited to the database despite the in memory version created clearly does have the items. Is it not possible to pass the Skills at construction time? There must be a way round this? I need a single form to allow a person to register but I want to normalise the data so that I can add more skills at a later time. If you think this should 'just work' then a link to a working example would be great. Hope this makes sense, thanks in advance! Gav

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  • Connect to a site using proxy code in java

    - by Nithin
    I want to connect to as site through proxy in java.This is the code which I have written public class ConnectThroughProxy { Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("proxy ip", 8080)); public static void main(String[] args) { try{ URL url = new URL("http://www.rgagnon.com/javadetails/java-0085.html"); URLConnection connection=url.openConnection(); String encoded = new String(Base64.encode(new String("user_name:pass_word").getBytes())); connection.setDoOutput(true); connection.setRequestProperty("Proxy-Authorization","Basic "+encoded); String page=""; String line; StringBuffer tmp = new StringBuffer(); BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream())); while ((line=in.readLine()) != null){ page.concat(line + "\n"); } System.out.println(page); }catch(Exception ex){ ex.printStackTrace(); } } while trying to run this code it throws the following error java.lang.IllegalArgumentException: Illegal character(s) in message header value: Basic dXNlcl9uYW1lOnBhc3Nfd29yZA== at sun.net.www.protocol.http.HttpURLConnection.checkMessageHeader(HttpURLConnection.java:323) at sun.net.www.protocol.http.HttpURLConnection.setRequestProperty(HttpURLConnection.java:2054) at test.ConnectThroughProxy.main(ConnectThroughProxy.java:30) Any Idea how to do it.

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  • Trying to calculate the 10001st prime number in Java.

    - by user247679
    Greetings. I am doing Problem 7 from Project Euler. What I am supposed to do is calculate the 10001st prime number. (A prime number being a number that is only divisible by itself and one.) Here is my current program: public class Problem7 { public static void main(String args []){ long numberOfPrimes = 0; long number = 2; while (numberOfPrimes < 10001){ if(isPrime(number)){ numberOfPrimes++; } number++; } System.out.println("10001st prime: "+ number); } public static boolean isPrime(long N) { if (N <= 1) return false; else return Prime(N,N-1); } public static boolean Prime(long X,long Y) { if (Y == 1) return true; else if (X % Y == 0) return false; else return Prime(X, Y-1); } } It works okay with finding, say the 100th prime number, but when I enter very large numbers such as 10001 it causes a stack overflow. Does anyone know of a way to fix this? Thanks for reading my problem!

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  • Proof of library bug vs developer side application bug

    - by Paralife
    I have a problem with a specific java client library. I wont say here the problem or the name of the library because my question is a different one. Here is the situation: I have made a program that uses the library. The program is a class named 'WorkerThread' that extends Thread. To start it I have made a Main class that only contains a main() function that starts the thread and nothing else. The worker uses the library to perform comm with a server and get results. The problem appears when I want to run 2 WorkerThreads simultaneously. What I first did was to do this in the Main class: public class Main { public static void main(String args[]) { new WorkerThread().start(); // 1st thread. new WorkerThread().start(); // 2nd thread. } } When I run this, both threads produce irrational results and what is more , some results that should be received by 1st thread are received by the 2nd instead. If instead of the above, I just run 2 separate processes of one thread each, then everything works fine. Also: 1.There is no static class or method used inside WorkerThread that could cause the problem. My application consists of only the worker thread class and contains no static fields or methods 2.The library is supposed to be usable in a multithreaded environment. In my thread I just create a new instance of a library's class and then call methods on it. Nothing more. My question is this: Without knowing any details of my implementation, is the above situation and facts enough to prove that there is a bug in the library and not in my programm? Is it safe to assume that the library inside uses a static method or object that is indirectly shared by my 2 threads and this causes the problem? If no then in what hypothetical situation could the bug originate in the worker class code?

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  • JavaMail: Could not connect to SMTP server.

    - by javacode
    Hi The following code causes an error. Please help me understand what's wrong. import javax.mail.*; import javax.mail.internet.*; import java.util.*; public class SendMail { public static void main(String [] args)throws MessagingException { SendMail sm=new SendMail(); sm.postMail(new String[]{"[email protected]"},"hi","hello","[email protected]"); } public void postMail( String recipients[ ], String subject, String message , String from) throws MessagingException { boolean debug = false; //Set the host smtp address Properties props = new Properties(); props.put("mail.smtp.host", "webmail.emailmyname.com"); // create some properties and get the default Session Session session = Session.getDefaultInstance(props, null); session.setDebug(debug); // create a message Message msg = new MimeMessage(session); // set the from and to address InternetAddress addressFrom = new InternetAddress(from); msg.setFrom(addressFrom); InternetAddress[] addressTo = new InternetAddress[recipients.length]; for (int i = 0; i < recipients.length; i++) { addressTo[i] = new InternetAddress(recipients[i]); } msg.setRecipients(Message.RecipientType.TO, addressTo); // Optional : You can also set your custom headers in the Email if you Want msg.addHeader("MyHeaderName", "myHeaderValue"); // Setting the Subject and Content Type msg.setSubject(subject); msg.setContent(message, "text/plain"); Transport.send(msg); } } Exception: <pre> com.sun.mail.smtp.SMTPSendFailedException: 450 smtpout04.dca.untd.com Authentication required at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:1829) at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1368) at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:886) at javax.mail.Transport.send0(Transport.java:191) at javax.mail.Transport.send(Transport.java:120) at SendMail.postMail(SendMail.java:52) at SendMail.main(SendMail.java:10)

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  • SQLiteDataAdapter Fill exception C# ADO.NET

    - by Lirik
    I'm trying to use the OleDb CSV parser to load some data from a CSV file and insert it into a SQLite database, but I get an exception with the OleDbAdapter.Fill method and it's frustrating: An unhandled exception of type 'System.Data.ConstraintException' occurred in System.Data.dll Additional information: Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints. Here is the source code: public void InsertData(String csvFileName, String tableName) { String dir = Path.GetDirectoryName(csvFileName); String name = Path.GetFileName(csvFileName); using (OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + dir + @";Extended Properties=""Text;HDR=No;FMT=Delimited""")) { conn.Open(); using (OleDbDataAdapter adapter = new OleDbDataAdapter("SELECT * FROM " + name, conn)) { QuoteDataSet ds = new QuoteDataSet(); adapter.Fill(ds, tableName); // <-- Exception here InsertData(ds, tableName); // <-- Inserts the data into the my SQLite db } } } class Program { static void Main(string[] args) { SQLiteDatabase target = new SQLiteDatabase(); string csvFileName = "D:\\Innovations\\Finch\\dev\\DataFeed\\YahooTagsInfo.csv"; string tableName = "Tags"; target.InsertData(csvFileName, tableName); Console.ReadKey(); } } The "YahooTagsInfo.csv" file looks like this: tagId,tagName,description,colName,dataType,realTime 1,s,Symbol,symbol,VARCHAR,FALSE 2,c8,After Hours Change,afterhours,DOUBLE,TRUE 3,g3,Annualized Gain,annualizedGain,DOUBLE,FALSE 4,a,Ask,ask,DOUBLE,FALSE 5,a5,Ask Size,askSize,DOUBLE,FALSE 6,a2,Average Daily Volume,avgDailyVolume,DOUBLE,FALSE 7,b,Bid,bid,DOUBLE,FALSE 8,b6,Bid Size,bidSize,DOUBLE,FALSE 9,b4,Book Value,bookValue,DOUBLE,FALSE I've tried the following: Removing the first line in the CSV file so it doesn't confuse it for real data. Changing the TRUE/FALSE realTime flag to 1/0. I've tried 1 and 2 together (i.e. removed the first line and changed the flag). None of these things helped... One constraint is that the tagId is supposed to be unique. Here is what the table look like in design view: Can anybody help me figure out what is the problem here?

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  • Netbeans and EOF

    - by sqlnoob
    Hey there, Java, ANTLR and Netbeans newbie here. I have installed a jdk and netbeans. I started a new project on netbeans 6.8 and i have added the antlr-3.2.jar as a library. I also created a lexer and parser class using AntlrWorks. These classes are named ExprParser.java and ExprLexer.java. I copied them into a directory named path-to-netbeans-project/src/parsers. I have a main file: package javaapplication2; import org.antlr.runtime.*; import parsers.*; public class Main { public static void main(String[] args) throws Exception{ ANTLRInputStream input = new ANTLRInputStream(System.in); ExprLexer lexer = new ExprLexer(input); CommonTokenStream tokens = new CommonTokenStream(lexer); ExprParser parser = new ExprParser(tokens); parser.prog(); } } The application builds fine. The book I'm reading says I should run the program and type in some stuff and then press Ctrl+Z (I'm on windows) to send EOF to the console. Problem is that nothing happens when I press Ctrl+z in the netbeans console. When I run from the command line, ctrl+z works fine. This is probably WAY too much information, but I can't figure it out. Sorry. Probably not a good idea to learn 3 new technologies at once.

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  • Chain of DataBinding

    - by Neir0
    Hello I am trying to do follow DataBinding Property -> DependencyProperty -> Property But i have trouble. For example, We have simple class with two properties implements INotifyPropertyChanged: public class MyClass : INotifyPropertyChanged { private string _num1; public string Num1 { get { return _num1; } set { _num1 = value; OnPropertyChanged("Num1"); } } private string _num2; public string Num2 { get { return _num2; } set { _num2 = value; OnPropertyChanged("Num2"); } } public event PropertyChangedEventHandler PropertyChanged; public void OnPropertyChanged(string e) { PropertyChangedEventHandler handler = PropertyChanged; if (handler != null) handler(this, new PropertyChangedEventArgs(e)); } } And TextBlock declared in xaml: <TextBlock Name="tb" FontSize="20" Foreground="Red" Text="qwerqwerwqer" /> Now lets trying to bind Num1 to tb.Text: private MyClass _myClass = new MyClass(); public MainWindow() { InitializeComponent(); Binding binding1 = new Binding("Num1") { Source = _myClass, Mode = BindingMode.OneWay }; Binding binding2 = new Binding("Num2") { Source = _myClass, Mode = BindingMode.TwoWay }; tb.SetBinding(TextBlock.TextProperty, binding1); //tb.SetBinding(TextBlock.TextProperty, binding2); var timer = new Timer(500) {Enabled = true,}; timer.Elapsed += (sender, args) => _myClass.Num1 += "a"; timer.Start(); } It works well. But if we uncomment this string tb.SetBinding(TextBlock.TextProperty, binding2); then TextBlock display nothing. DataBinding doesn't work! How can i to do what i want?

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  • Use Math class to calculate

    - by LC
    Write a JAVA program that calculates the surface area of a cylinder, C= 2( p r2) + 2 p r h, where r is the radius and h is the height of the cylinder. Allow the user to enter in a radius and a height. Format the output to three decimal places. Use the constant PI and the method pow() from the Math class. This is what I've done so far but it can not run. Can anyone help me ? import Java.util Scanner; public class Ex5 { public static void main (String[] args) { Scanner input.new Scanner(System.in); double radius,height,area; System.out.print("Please enter the radius of the Cylinder"); radius = input.nextDouble(); System.out.print("Please enter the height of the Cylinder"); height = input.nextDouble(); area = (4*Math.PI*radius)+2*Math.PIMath.POW(radius,2); System.out.println("The surface of the cylinder" + area); } }

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  • NAudio playback wont stop successfully

    - by Kurru
    Hi When using NAudio to playback an mp3 [in the console], I cant figure out how to stop the playback. When I call waveout.Stop() the code just stops running and waveout.Dispose() never gets called. Is it something to do with the function callback? I dont know how to fix that if it is. static string MP3 = @"song.mp3"; static WaveOut waveout; static WaveStream playback; static void Main(string[] args) { waveout = new WaveOut(WaveCallbackInfo.FunctionCallback()); playback = OpenMp3Stream(MP3); waveout.Init(playback); waveout.Play(); Console.WriteLine("Started"); Thread.Sleep(2 * 1000); Console.WriteLine("Ending"); if (waveout.PlaybackState != PlaybackState.Stopped) waveout.Stop(); Console.WriteLine("Stopped"); waveout.Dispose(); Console.WriteLine("1st dispose"); playback.Dispose(); Console.WriteLine("2nd dispose"); } private static WaveChannel32 OpenMp3Stream(string fileName) { WaveChannel32 inputStream; WaveStream mp3Reader = new Mp3FileReader(fileName); WaveStream pcmStream = WaveFormatConversionStream.CreatePcmStream(mp3Reader); WaveStream blockAlignedStream = new BlockAlignReductionStream(pcmStream); inputStream = new WaveChannel32(blockAlignedStream); return inputStream; }

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  • MonoDevelop 2.8.2: Build failed. Illegal characters in path

    - by user1056607
    I have just installed MonoDevelop 2.8.2. After opening a new solution named test I attempted to run the project. I push f5 and all I see is a "Build failed. Illegal characters in path" error in the bottom left. I open up the Error List and see no errors. I have done some searching and only find solutions pertaining to projects that are beyond the scope of just the pre-generated code. This is the code: using System; namespace Test { class MainClass { public static void Main(string[] args) { Console.WriteLine("Hello World!"); } } } I have tried to uninstall/reinstall, cut out any spaces in the path to the program or the solution, and even opened VS2010 and just copy pasted that code over. I've looked over my options under tools, solution options under project, and the project's options. I am running MD 2.8.2 with GTK# and Microsoft's .NET runtime. Let me know if you need anymore information. Any help would be appreciated. Thank you for your time!

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  • C# - Help with LINQ

    - by cmaduro
    I need to check if a certain property exists within a class. Please refer to the LINQ query in question. For the life of me I cannot make the compiler happy. class Program { static void Main(string[] args) { ModuleManager m = new ModuleManager(); IModule module = m.FindModuleForView(typeof(HomeView)); Console.WriteLine(module.GetType().ToString()); Console.ReadLine(); } } public class ModuleManager { [ImportMany] public IEnumerable<Lazy<IModule>> Modules { get; set; } [ImportMany] public IEnumerable<Lazy<View>> Views { get; set; } public ModuleManager() { //An aggregate catalog that combines multiple catalogs var catalog = new AggregateCatalog(); //Adds all the parts found in the same assembly as the Program class catalog.Catalogs.Add(new AssemblyCatalog(typeof(Program).Assembly)); //Create the CompositionContainer with the parts in the catalog _container = new CompositionContainer(catalog); //Fill the imports of this object try { this._container.ComposeParts(this); } catch (CompositionException compositionException) { Console.WriteLine(compositionException.ToString()); } } public IModule FindModuleForView(Type view) { //THIS IS THE PROBLEM var module = from m in Modules where ( from p in m.Value.GetType().GetProperties() where p.GetType().Equals(view) select p ) select m; } public CompositionContainer _container { get; set; } } public interface IModule { } [Export] public class HomeModule : IModule { public HomeModule() { } [Export] public HomeView MyHomeView { get { return new HomeView(); } set { } } } public class HomeView : View { } public class View { }

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  • longest string in texts

    - by davit-datuashvili
    Ihave following code in Java: import java.util.*; public class longest{ public static void main(String[] args){ int t=0;int m=0;int token1, token2; String words[]=new String[10]; String word[]=new String[10]; String common[]=new String[10]; String text="saqartvelo gabrwyindeba da gadzlierdeba aucileblad "; String text1="saqartvelo gamtliandeba da gadzlierdeba aucileblad"; StringTokenizer st=new StringTokenizer(text); StringTokenizer st1=new StringTokenizer(text1); token1=st.countTokens(); token2=st1.countTokens(); while (st.hasMoreTokens()){ words[t]=st.nextToken(); t++; } while (st1.hasMoreTokens()){ word[m]=st1.nextToken(); m++; } for (int k=0;k<token1;k++){ for (int f=0;f<token2;f++){ if (words[f].compareTo(word[f])==0){ common[f]=words[f]; } } } while (i<common.length){ System.out.println(common[i]); i++; } } } I want that in common array put elements which i in both text or these words saqartvelo (georgia in english) da (and in english) gadzlierdeba (will be stronger) aucileblad (sure) and then between these words find string which has maximum length but it does not work more correctly it show me these words and also many null elements. How do I correct it?

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  • Calling server side method as filling value inside a textbox from calendar extender

    - by Dharmendra Singh
    I have a text box which i m filling of date from the calendar extender and the code is as below:- <label for="input-one" class="float"><strong>Date</strong></label><br /> <asp:TextBox ID="txtDate" runat="server" CssClass="inp-text" Enabled="false" AutoPostBack="true" Width="300px" ontextchanged="txtDate_TextChanged"></asp:TextBox> <asp:ImageButton ID="btnDate2" runat="server" AlternateText="cal2" ImageUrl="~/App_Themes/Images/icon_calendar.jpg" style="margin-top:auto;" CausesValidation="false" onclick="btnDate2_Click" /> <ajaxToolkit:CalendarExtender ID="calExtender2" runat="server" Format="dddd, MMMM dd, yyyy" OnClientDateSelectionChanged="CheckDateEalier" PopupButtonID="btnDate2" TargetControlID="txtDate" /> <asp:RequiredFieldValidator ID="RequiredFieldValidator7" runat="server" ControlToValidate="txtDate" ErrorMessage="Select a Date" Font-Bold="True" Font-Size="X-Small" ForeColor="Red"></asp:RequiredFieldValidator><br /> Javascript code is :- function CheckDateEalier(sender, args) { sender._textbox.set_Value(sender._selectedDate.format(sender._format)) } My requirement is that as the date is entered in to the textbox, I want to call this method: public void TimeSpentDisplay() { string date = txtDate.Text.ToString(); DateTime dateparsed = DateTime.ParseExact(date, "dddd, MMMM dd, yyyy", null); DateTime currentDate = System.DateTime.Now; if (dateparsed.Date > currentDate.Date) { divtimeSpent.Visible = true; } if (dateparsed.Date < currentDate.Date) { divtimeSpent.Visible = true; } if (dateparsed.Date == currentDate.Date) { divtimeSpent.Visible = false; } } Please help me that how i achieve this as i m calling this method inside txtDate_TextChanged method but the event is not firing as the text is changed inside the textbox. Please suggest how I can achieve this or give me an alternate idea to fulfill my requirement.

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  • Reference a Map by name within Velocity Template

    - by Wiretap
    Pretty sure there is an easy answer to this, but just can't find the right VTL syntax. In my context I'm passing a Map which contains other Maps. I'd like to reference these inner maps by name and assign them within my template. The inner maps are constructed by different parts of the app, and then added to the context by way of example public static void main( String[] args ) throws Exception { VelocityEngine ve = new VelocityEngine(); ve.init(); Template t = ve.getTemplate( "test.vm" ); VelocityContext context = new VelocityContext(); Map<String,Map<String,String>> messageData = new HashMap<String, Map<String,String>>(); Map<String,String> data_map = new HashMap<String,String>(); data_map.put("data_1","1234"); data_map.put("a_date", "31-Dec-2009"); messageData.put("inner_map", data_map); context.put("msgData", messageData); StringWriter writer = new StringWriter(); t.merge( context, writer ); System.out.println( writer.toString() ); } Template - test.vm #set ($in_map = $msgData.get($inner_map) ) data: $in_map.data_1 $in_map.a_date

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  • Perl XML SAX parser emulating XML::Simple record for record

    - by DVK
    Short Q summary: I am looking a fast XML parser (most likely a wrapper around some standard SAX parser) which will produce per-record data structure 100% identical to those produced by XML::Simple. Details: We have a large code infrastructure which depends on processing records one-by-one and expects the record to be a data structure in a format produced by XML::Simple since it always used XML::Simple since early Jurassic era. An example simple XML is: <root> <rec><f1>v1</f1><f2>v2</f2></rec> <rec><f1>v1b</f1><f2>v2b</f2></rec> <rec><f1>v1c</f1><f2>v2c</f2></rec> </root> And example rough code is: sub process_record { my ($obj, $record_hash) = @_; # do_stuff } my $records = XML::Simple->XMLin(@args)->{root}; foreach my $record (@$records) { $obj->process_record($record) }; As everyone knows XML::Simple is, well, simple. And more importantly, it is very slow and a memory hog - due to being a DOM parser and needing to build/store 100% of data in memory. So, it's not the best tool for parsing an XML file consisting of large amount of small records record-by-record. However, re-writing the entire code (which consist of large amount of "process_record"-like methods) to work with standard SAX parser seems like an big task not worth the resources, even at the cost of living with XML::Simple. What I'm looking for is an existing module which will probably be based on a SAX parser (or anything fast with small memory footprint) which can be used to produce $record hashrefs one by one based on the XML pictured above that can be passed to $obj->process_record($record) and be 100% identical to what XML::Simple's hashrefs would have been.

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  • changing background on JLabel shifts components

    - by Aly
    Hi, The code I am using is: public class Test extends JFrame implements ActionListener{ private static final Color TRANSP_WHITE = new Color(new Float(1), new Float(1), new Float(1), new Float(0.5)); private static final Color TRANSP_RED = new Color(new Float(1), new Float(0), new Float(0), new Float(0.1)); private static final Color[] COLORS = new Color[]{ TRANSP_RED, TRANSP_WHITE}; private int index = 0; private JLabel label; private JButton button; public Test(){ super(); setLayout(new BoxLayout(getContentPane(), BoxLayout.Y_AXIS)); label = new JLabel("hello world"); label.setOpaque(true); label.setBackground(TRANSP_WHITE); getContentPane().add(label); button = new JButton("Click Me"); button.addActionListener(this); getContentPane().add(button); pack(); setVisible(true); } @Override public void actionPerformed(ActionEvent e) { if(e.getSource().equals(button)){ label.setBackground(COLORS[index % (COLORS.length )]); index ++; } } public static void main(String[] args) { new Test(); } } When I click the button to change the labales color the GUI looks like this: Before: After: Any ideas why?

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  • Learning AES: the KeyBytes

    - by Tom Brito
    I got the following example from here: import java.security.Security; import javax.crypto.Cipher; import javax.crypto.spec.SecretKeySpec; public class MainClass { public static void main(String[] args) throws Exception { Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider()); byte[] input = "www.java2s.com".getBytes(); byte[] keyBytes = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 }; SecretKeySpec key = new SecretKeySpec(keyBytes, "AES"); Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC"); System.out.println(new String(input)); // encryption pass cipher.init(Cipher.ENCRYPT_MODE, key); byte[] cipherText = new byte[cipher.getOutputSize(input.length)]; int ctLength = cipher.update(input, 0, input.length, cipherText, 0); ctLength += cipher.doFinal(cipherText, ctLength); System.out.println(new String(cipherText)); System.out.println(ctLength); // decryption pass cipher.init(Cipher.DECRYPT_MODE, key); byte[] plainText = new byte[cipher.getOutputSize(ctLength)]; int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0); ptLength += cipher.doFinal(plainText, ptLength); System.out.println(new String(plainText)); System.out.println(ptLength); } } I imagine that the byte[] keyBytes should be random generated, so I gone to test the max size before do it. When adding one more byte 0x18 to the array, the exception raised: InvalidKeyException: Key length not 128/192/256 bits. But the original 18 bytes (from 0 to 17) are not multiple of nither 128, 192 or 256. I would like to understand the math here.. can anyone explain me? Thanks!

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  • JDK-7 SwingWorker deadlocks?

    - by kd304
    I have a small image processing application which does multiple things at once using SwingWorker. However, if I run the following code (oversimplified excerpt), it just hangs on JDK 7 b70 (windows) but works in 6u16. It starts a new worker within another worker and waits for its result (the real app runs multiple sub-workers and waits for all this way). Did I use some wrong patterns here (as mostly there is 3-5 workers in the swingworker-pool, which has limit of 10 I think)? import javax.swing.SwingUtilities; import javax.swing.SwingWorker; public class Swing { static SwingWorker<String, Void> getWorker2() { return new SwingWorker<String, Void>() { @Override protected String doInBackground() throws Exception { return "Hello World"; } }; } static void runWorker() { SwingWorker<String, Void> worker = new SwingWorker<String, Void>() { @Override protected String doInBackground() throws Exception { SwingWorker<String, Void> sw2 = getWorker2(); sw2.execute(); return sw2.get(); } }; worker.execute(); try { System.out.println(worker.get()); } catch (Exception e) { e.printStackTrace(); } } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { runWorker(); } }); } }

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  • Windows Service Conundrum

    - by Paul Johnson
    All, I have a Custom object which I have written using VB.NET (.net 2.0). The object instantiates its own threading.timer object and carries out a number of background process including periodic interrogation of an oracle database and delivery of emails via smtp according to data detected in the database. The following is the code implemented in the windows service class Public Class IncidentManagerService 'Fakes Private _fakeRepoFactory As IRepoFactory Private _incidentRepo As FakeIncidentRepo Private _incidentDefinitionRepo As FakeIncidentDefinitionRepo Private _incManager As IncidentManager.Session 'Real Private _started As Boolean = False Private _repoFactory As New NHibernateRepoFactory Private _psalertsEventRepo As IPsalertsEventRepo = _repoFactory.GetPsalertsEventRepo() Protected Overrides Sub OnStart(ByVal args() As String) ' Add code here to start your service. This method should set things ' in motion so your service can do its work. If Not _started Then Startup() _started = True End If End Sub Protected Overrides Sub OnStop() 'Tear down class variables in order to ensure the service stops cleanly _incManager.Dispose() _incidentDefinitionRepo = Nothing _incidentRepo = Nothing _fakeRepoFactory = Nothing _repoFactory = Nothing End Sub Private Sub Startup() Dim incidents As IList(Of Incident) = Nothing Dim incidentFactory As New IncidentFactory incidents = IncidentFactory.GetTwoFakeIncidents _repoFactory = New NHibernateRepoFactory _fakeRepoFactory = New FakeRepoFactory(incidents) _incidentRepo = _fakeRepoFactory.GetIncidentRepo _incidentDefinitionRepo = _fakeRepoFactory.GetIncidentDefinitionRepo 'Start an incident manager session _incManager = New IncidentManager.Session(_incidentRepo, _incidentDefinitionRepo, _psalertsEventRepo) _incManager.Start() End Sub End Class After a little bit of experimentation I arrived at the above code in the OnStart method. All functionality passed testing when deployed from VS2005 on my development PC, however when deployed on a true target machine, the service would not start and responds with the following message: "The service on local computer started and then stopped..." Am I going about this the correct way? If not how can I best implement my incident manager within the confines of the Windows Service class. It seems pointless to implement a timer for the incidentmanager because this already implements its own timer... Any assistance much appreciated. Kind Regards Paul J.

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  • Using Fantom USB Driver from JNI

    - by Starky
    I'm having some difficulty with JNI. I'm using JNI to call some Java methods from a C++ program. This implementation of JNI is working fine. The goal of the Java program is to send commands over USB to a LEGO robot using LEJOS. This works fine when running the Java program by itself but for some reason when I call the methods from C++ the robot cannot be detected. My only lead so far is that there may be some problem using the Fantom USB driver from a JNI call. This is the driver that's used for the USB connection to the robot. I've had a quick look at the code for the driver and it looks like it makes use of JNI too. So I guess I'm asking the following things: What differences could there be between calling code from JNI and executing it through command prompt with the 'java classname args' method which could cause this problem? Could it be that there is some problem with me using JNI in C++ when the driver that's being used uses JNI as well? I won't post any code just now as I don't think it's really relevant but if anyone thinks that they need to see it then I can add it.

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  • Changing FileNames using RegEx and Recursion

    - by yeahumok
    Hello I'm trying to rename files that my program lists as having "illegal characters" for a SharePoint file importation. The illegal characters I am referring to are: ~ # % & * {} / \ | : < ? - "" What i'm trying to do is recurse through the drive, gather up a list of filenames and then through Regular Expressions, pick out file names from a List and try to replace the invalid characters in the actual filenames themselves. Anybody have any idea how to do this? So far i have this: (please remember, i'm a complete n00b to this stuff) class Program { static void Main(string[] args) { string[] files = Directory.GetFiles(@"C:\Documents and Settings\bob.smith\Desktop\~Test Folder for [SharePoint] %testing", "*.*", SearchOption.AllDirectories); foreach (string file in files) { Console.Write(file + "\r\n"); } Console.WriteLine("Press any key to continue..."); Console.ReadKey(true); string pattern = " *[\\~#%&*{}/:<>?|\"-]+ *"; string replacement = " "; Regex regEx = new Regex(pattern); string[] fileDrive = Directory.GetFiles(@"C:\Documents and Settings\bob.smith\Desktop\~Test Folder for [SharePoint] %testing", "*.*", SearchOption.AllDirectories); StreamWriter sw = new StreamWriter(@"C:\Documents and Settings\bob.smith\Desktop\~Test Folder for [SharePoint] %testing\File_Renames.txt"); foreach(string fileNames in fileDrive) { string sanitized = regEx.Replace(fileNames, replacement); sw.Write(sanitized + "\r\n"); } sw.Close(); } } So what i need to figure out is how to recursively search for these invalid chars, replace them in the actual filename itself. Anybody have any ideas?

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