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  • implementing java interface with scala class - type issue

    - by paintcan
    Why on earth won't this compile? Scala 2.8.0RC3: Java public interface X { void logClick(long ts, int cId, String s, double c); } Scala class Y extends X { def logClick(ts: Long, cId: Int,sid: java.lang.String,c: Double) : Unit = { ... } } Error class Y needs to be abstract, since method logClick in trait X of type (ts: Long,cId: Int,s: java.lang.String,c: Double)Unit is not defined

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  • C++ - Breaking code implementation into different parts

    - by Kotti
    Hi! The question plot (a bit abstract, but answering this question will help me in my real app): So, I have some abstract superclass for objects that can be rendered on the screen. Let's call it IRenderable. struct IRenderable { // (...) virtual void Render(RenderingInterface& ri) = 0; virtual ~IRenderable() { } }; And suppose I also have some other objects that derive from IRenderable, e.g. Cat and Dog. So far so good. I add some Cat and Dog specific methods, like SeekForWhiskas(...) and Bark(...). After that I add specific Render(...) method for them, so my code looks this way: class Cat : public IRenderable { public: void SeekForWhiskas(...) { // Implementation could be here or moved // to a source file (depends on me wanting // to inline it or not) } virtual void Render(...) { // Here comes the rendering routine, that // is specific for cats SomehowDrawAppropriateCat(...); } }; class Dog : public IRenderable { public: void Bark(...) { // Same as for 'SeekForWhiskas(...)' } virtual void Render(...) { // Here comes the rendering routine, that // is specific for dogs DrawMadDog(...); } }; And then somewhere else I can do drawing the way that an appropriate rendering routine is called: IRenderable* dog = new Dog(); dog->Render(...); My question is about logical wrapping of such kind of code. I want to break apart the code, that corresponds to rendering of the current object and it's own methods (Render and Bark in this example), so that my class implementation doesn't turn into a mess (imagine that I have 10 methods like Bark and of course my Render method doesn't fit in their company and would be hard to find). Two ways of making what I want to (as far as I know) are: Making appropriate routines that look like RenderCat(Cat& cat, RenderInterface* ri), joining them to render namespace and then the functions inside a class would look like virtual void Render(...) { RenderCat(*this, ...); }, but this is plain stupid, because I'll lose access to Cat's private members and friending these functions looks like a total design disaster. Using visitor pattern, but this would also mean I have to rebuild my app's design and looks like an inadequate way to make my code complicated from the very beginning. Any brilliant ideas? :)

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  • Replace Components.classesByID with document.implementation.createDocument

    - by Earl Smith
    I am not the author of this code, but it is no longer maintained. So I am trying to fix it, but I have very little experience in javascript. Since Firefox 9, Components.classesByID["{3a9cd622-264d-11d4-ba06-0060b0fc76dd}"]. has been obsolete. Instead, it is suggested that document.implementation.createDocument be used. Can someone here show me how to implement these changes? I seem to be, just banging my head with everything I have tried. The example given at Mozilla developer network is: var doc = document.implementation.createDocument ("http://www.w3.org/1999/xhtml", "html", null); var body = document.createElementNS("http://www.w3.org/1999/xhtml", "body"); body.setAttribute("id", "abc"); doc.documentElement.appendChild(body); alert(doc.getElementById("abc")); // [object HTMLBodyElement] and the code in the .jsm I am trying to fix is: this.fgImageData = {}; this.fgImageData["check"] = [ " *", " **", "* ***", "** *** ", "***** ", " *** ", " * "]; this.fgImageData["radio"] = [ " **** ", "******", "******", "******", "******", " **** "]; this.fgImageData["menu-ltr"] = [ "* ", "** ", "*** ", "****", "*** ", "** ", "* "]; this.fgImageData["menu-rtl"] = [ " *", " **", " ***", "****", " ***", " **", " *"]; // I think I'm doing something slightly wrong when creating the document // but I'm not sure. It works though. *FIX* var domi = Components.classesByID["{3a9cd622-264d-11d4-ba06-0060b0fc76dd}"]. createInstance(Components.interfaces.nsIDOMDOMImplementation); this.document = domi.createDocument("http://www.w3.org/1999/xhtml", "html", null); this.canvas = this.document.createElementNS("http://www.w3.org/1999/xhtml", "html:canvas"); for(var name in this.fgImageData) { if (this.fgImageData.hasOwnProperty(name)) { var data = this.fgImageData[name]; var width = data[0].length; var height = data.length; this.canvas.width = width; this.canvas.height = height; var g = this.canvas.getContext("2d"); g.clearRect(0, 0, width, height); var idata = g.getImageData(0, 0, width, height); for(var y=0, oy=0; y<height; y++, oy+=idata.width*4) for(var x=0, ox=oy; x<width; x++, ox+=4) idata.data[ox+3] = data[y][x] == " " ? 0 : 255; this.fgImageData[name] = idata; } } },

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  • Naming Exception when bounding to the home interface

    - by Nila
    Hi! I'm new to ejb. I'm trying to call the ejb from the servlet. But, I'm getting the NamingException. I'm directly running the servlet from the netbeans to check whether it is calling the ejb. But, it is not working. I'm getting the exception as home interface not bound. What is the solution for this?

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  • Tapestry5 : No service implements the interface org.springframework.context.ApplicationContext

    - by Joel
    I'm using the Tapestry5 tapx template library to send an html email, as per this example. When I run the example I get the following error: Caused by: java.lang.RuntimeException: No service implements the interface org.springframework.context.ApplicationContext. at org.apache.tapestry5.ioc.internal.RegistryImpl.getService(RegistryImpl.java:560) at org.apache.tapestry5.ioc.internal.ObjectLocatorImpl.getService(ObjectLocatorImpl.java:44) All the tapestry-* jars, including tapestry-spring-5.1.05.jar are in my classpath. Any clues as to what I'm missing?

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  • The internal implementation of R's dataset

    - by Yin Zhu
    I am trying to build a data processing program. Currently I use a double matrix to represent the data table, each row is an instance, each column represents a feature. I also have an extra vector as the target value for each instance, it is of double type for regression, it is of integer for classification. I want to make it more general. I am wondering how what kind of structure R uses to store a dataset, i.e. the internal implementation in R.

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  • Good books and resources on user interface testing

    - by josefx
    I am looking for good books and articles on user-interface testing. What they should contain (one or more of): different test methods/strategies examples, use cases naming pros and cons for different methods something important I might have forgotten :-) What they should not be: Only about general tests and not gui tests describing a test framework limited to a single language What are the best resources you know of? (preferably language agnostic)

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  • RSA PKCS1 implementation in Python

    - by user307016
    I'm working on the RSA PKCS1 implementation in Python,here's the message block i got: m = [0,2,random paddings,0,message integers] I read the RFC2313,and get a equation seems for transforming the message block object into an big-edian integer. I just get confused about how to transform it in Python. Any help would be appreciated.

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  • Doubleton Pattern Implementation

    - by Pierreten
    I'm leveraging the Doubleton Pattern from this link http://www.codeproject.com/KB/architecture/designpattern_doubleton.aspx in my own code. I think it makes things a lot easier since the Singleton only provides one instance, but I get two with this pattern. I was wondering if it would make sense to have it implement an interface so I can inject it into my domain layer.

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  • iPhone SDK development obj-C vs interface builder

    - by Amy
    I'm new to the iOS platform. I'm not clear on the purpose of the interface builder. It looks like I can avoid using it entirely and just write all the code in objective c. am I right? is there anything that IB can do but obj-c cannot? It reminds me of visual basic 6.

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