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  • Where do you extend classes in your rails application?

    - by ro
    Just about to extend the Array class with the following extension: class Array def shuffle! size.downto(1) { |n| push delete_at(rand(n)) } self end end However, I was wondering where a good place to keep these sort of extensions. I was thinking environment.rb or putting in its own file in the initializers directory.

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  • PHP ORM library based on the Data Mapper pattern

    - by Matthieu
    For a PHP application with a complex domain model, I don't want to use the Active Record pattern, I need instead the Data Mapper pattern (as presented in Zend Framework). Do you know any library that could help me for the ORM part, or else a link to a documentation on "how to do it right" ? Thanks

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  • Java loading user-specified classes at runtime

    - by user349043
    I'm working on robot simulation in Java (a Swing application). I have an abstract class "Robot" from which different types of Robots are derived, e.g. public class StupidRobot extends Robot { int m_stupidness; int m_insanityLevel; ... } public class AngryRobot extends Robot { float m_aggression; ... } As you can see, each Robot subclass has a different set of parameters. What I would like to do is control the simulation setup in the initial UI. Choose the number and type of Robots, give it a name, fill in the parameters etc. This is one of those times where being such a dinosaur programmer, and new to Java, I wonder if there is some higher level stuff/thinking that could help me here. So here is what I've got: (1) User Interface Scrolling list of Robot types on the left. "Add " and "<< Remove" buttons in the middle. Default-named scrolling list of Robots on the right. "Set Parameters" button underneath. (So if you wanted an AngryRobot, you'd select AngryRobot on the left list, click "Add" and "AngryRobot1" would show up on the right.) When selecting a Robot on the right, click "Set Parameters..." button which would call yet another model dialog where you'd fill in the parameters. Different dialog called for each Robot type. (2) Data structures an implementation As an end-product I think a HashMap would be most convenient. The keys would be Robot types and the accompanying object would be all of the parameters. The initializer could just retrieve each item one and a time and instantiate. Here's what the data structures would look like: enum ROBOT_TYPE {STUPID, ANGRY, etc} public class RobotInitializer { public ROBOT_TYPE m_type; public string m_name; public int[] m_int_params; public float[] m_float_params; etc. The initializer's constructor would create the appropriate length parameter arrays based on the type: public RobotInitializer(ROBOT_TYPE type, int[] int_array, float[] float_array, etc){ switch (type){ case STUPID: m_int_params = new int[STUPID_INT_PARAM_LENGTH]; System.arraycopy(int_array,0,m_int_params,0,STUPID_INT_PARAM_LENGTH); etc. Once all the RobotInitializers are instantiated, they are added to the HashMap. Iterating through the HashMap, the simulation initializer takes items from the Hashmap and instantiates the appropriate Robots. Is this reasonable? If not, how can it be improved? Thanks

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  • loading method based on URL

    - by steeped
    I am trying to build a small mvc-based application. How do I call a method in a class based on a query string? For example, the $_GET query string is being set as load_master_form http://www.domain.com/settings/load_master_form And to call the method within the settings class, I am doing: function __construct(){ $this->{$_GET['method']}(); } But obviously that doesn't work - it just isn't possible to load a method like that. So how would it be done?

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  • Python, invoke super constructor

    - by Mike
    class A: def __init__(self): print "world" class B(A): def __init__(self): print "hello" B() hello In all other languages I've worked with the super constructor is invoked implicitly. How does one invoke it in Python? I would expect super(self) but this doesn't work

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  • C++ string template library

    - by Gopalakrishnan Subramani
    I want simple C++ string based template library to replace strings at runtime. For example, I will use string template = "My name is {{name}}"; At runtime, I want the name to be changed based on actual one. I found one example, www.stringtemplate.org but I little scared when its talks about antlr etc.

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  • Java library suggestions for implementing a custom web server

    - by dexter
    I would like to create a web server that will serve/accept json files through REST. The JSON files being served will come from a database query and format the results into JSON. Any suggestions for a good java library. I have tried using Apache HTTPComponents. While maybe I can just create a servlet but I am not really allowed to install a servlet container in the server machine.

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  • Abstract attributes in Python

    - by deamon
    What is the shortest / most elegant way to implement the following Scala code with an abstract attribute in Python? abstract class Controller { val path: String } A subclass of Controller is enforced to define "path" by the Scala compiler. A subclass would look like this: class MyController extends Controller { override val path = "/home" }

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  • resources at class library

    - by Night Walker
    Hello I want to add some xml file as resource to my class library project . Any idea how to do so , and call it later? In windows application i would do it like ClassLibrary1.Properties.Resources.file.xml But here it didn't worked any idea how i do it here ?

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  • OpenCL C/C++ dynamic binding library (win32 and more)

    - by rotoglup
    I'm giving a try at OpenCL, and in order to put this in production I'd like to be able to bind dynamically to OpenCL.DLL (when under Windows), in order to handle 'gracefully' the case where no OpenCL is installed on the host computer. Is there any available library (or code snippet) that takes care of this dynamic binding in C or C++, much like GLEW does for OpenGL ? I'd like to avoid the hassle to do it myself. Thanks,

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  • Seeking jQuery-based transition library

    - by justSteve
    I'm looking for a library (or plugin) that help me create a slideshow where (besides the simple ordering of images) I'm able to define the beginning and ending positions (either X/Y, or Zooms) for a given image and the plugin animates the intervening steps between them. Flash has a number of tools/libs like this, i'm sure jQuery has seen similar. Ideally something that offers a range of easing effects as well. I understand these elements are native to jQuery...i'm looking for a time-tested wrapper. thx

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  • CMake: add static library to shared lib

    - by redvarib
    I would like to create shared library with cmake, but also I need to link it to third party static libraries. For example if it should include my own file1.o, file2.o, then statically linked libfoo.la and then be written down to disk as .so file which dynamically linked to libbar.so Is it even possible?

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