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  • Resetting Objects vs. Constructing New Objects

    - by byronh
    Is it considered better practice and/or more efficient to create a 'reset' function for a particular object that clears/defaults all the necessary member variables to allow for further operations, or to simply construct a new object from outside? I've seen both methods employed a lot, but I can't decide which one is better. Of course, for classes that represent database connections, you'd have to use a reset method rather than constructing a new one resulting in needless connecting/disconnecting, but I'm talking more in terms of abstraction classes. Can anyone give me some real-world examples of when to use each method? In my particular case I'm thinking mostly in terms of ORM or the Model in MVC. For example, if I would want to retrieve a bunch of database objects for display and modify them in one operation.

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  • Write a GreaseMonkey script that reacts to domain strings (for I18N, e.g. cn,en,fr,etc.)

    - by Shizhidi
    Hello. Suppose there is a website that supports multiple languages: cn.mydomain.com or mydomain.com/cn or mydomain.cn en.mydomain.com or mydomain.com/en or mydomain.com fr.mydomain.com or mydomain.com/fr or mydomain.fr I want to write a GreaseMonkey script that has variables assigned different strings/values according to the address the user is loading the page from. How do you do that? Thanks EDIT: I realize I can just use JavaScript to get the address. Does GreaseMonkey itself support this kind of function?

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  • A pragmatic view on private vs public

    - by Denis Gorbachev
    Hello everybody! I've always wondered on the topic of public, protected and private properties. My memory can easily recall times when I had to hack somebody's code, and having the hacked-upon class variables declared as private was always upsetting. Also, there were (more) times I've written a class myself, and had never recognized any potential gain of privatizing the property. I should note here that using public vars is not in my habit: I adhere to the principles of OOP by utilizing getters and setters. So, what's the whole point in these restrictions?

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  • Yet another Rails routing question

    - by danhere
    I can't seem to grasp the Rails routing just yet. I want to be able to link the site to, for example, ...com/store/xbox360/Mass Effect 2 (which is /store(my controller)/:system/:title). I have the database entries that include the :system and :title variables (?). How would I route these to show up and filter these entries? Or is this something I need to set up in the controller? I'm lost. Thanks so much for your help.

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  • Passing objects by reference or not in C#

    - by Piku
    Suppose I have a class like this: public class ThingManager { List<SomeClass> ItemList; public void AddToList (SomeClass Item) { ItemList.Add(Item); } public void ProcessListItems() { // go through list one item at a time, get item from list, // modify item according to class' purpose } } Assume "SomeClass" is a fairly large class containing methods and members that are quite complex (List<s and arrays, for example) and that there may be a large quantity of them, so not copying vast amounts of data around the program is important. Should the "AddToList" method have "ref" in it or not? And why? It's like trying to learn pointers in C all over again ;-) (which is probably why I am getting confused, I'm trying to relate these to pointers. In C it'd be "SomeClass *Item" and a list of "SomeClass *" variables)

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  • Saving a transliteration table in perl

    - by user246100
    I want to transliterate digits from 1 - 8 with 0 but not knowing the number at compile time. Since transliterations do not interpolate variables I'm doing this: @trs = (sub{die},sub{${$_[0]} =~ tr/[0,1]/[1,0]/},sub{${$_[0]} =~ tr/[0,2]/[2,0]/},sub{${$_[0]} =~ tr/[0,3]/[3,0]/},sub{${$_[0]} =~ tr/[0,4]/[4,0]/},sub{${$_[0]} =~ tr/[0,5]/[5,0]/},sub{${$_[0]} =~ tr/[0,6]/[6,0]/},sub{${$_[0]} =~ tr/[0,7]/[7,0]/},sub{${$_[0]} =~ tr/[0,8]/[8,0]/}); and then index it like: $trs[$character_to_transliterate](\$var_to_change); I would appreciate if anyone can point me to a best looking solution.

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  • For REST, how do I receive posted data using PHP?

    - by netrox
    I want to set up a tiny RESTful interface for my web services using PHP. The problem is that I looked at frameworks and I cannot figure out how do I recieve the posted data without field names? For example, if a server posts data to my server, I cannot figure out how do I get it without needing the postfield (POST variables). Traditionally, with forms, people send post data with field names such as this: curl_setopt($ch, CURLOPT_POSTFIELDS, postfield=postvalue); and I would use PHP code like this: $postvalue=$_POST[postfield]; to get value of postfield but since the server posting data is not using postfield and is just sending XML, how do I get it without fields? How do I capture the XML? That's where I am lost.

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  • when is java faster than c++ (or when is JIT faster then precompiled)?

    - by kostja
    I have heard that under certain circumstances, Java programs or rather parts of java programs are able to be executed faster than the "same" code in C++ (or other precompiled code) due to JIT optimizations. This is due to the compiler being able to determine the scope of some variables, avoid some conditionals and pull similar tricks at runtime. Could you give an (or better - some) example, where this applies? And maybe outline the exact conditions under which the compiler is able to optimize the bytecode beyond what is possible with precompiled code? NOTE : This question is not about comparing Java to C++. Its about the possibilities of JIT compiling. Please no flaming. I am also not aware of any duplicates. Please point them out if you are.

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  • How to signal a buffer full state between posix threads

    - by mikip
    Hi I have two threads, the main thread 'A' is responsible for message handling between a number of processes. When thread A gets a buffer full message, it should inform thread B and pass a pointer to the buffer which thread B will then process. When thread B has finished it should inform thread A that it has finished. How do I go about implementing this using posix threads using C on linux. I have looked at conditional variables, is this the way to go? . I'm not experienced in multi threaded programming and would like some advice on the best avenue to take. Thanks

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  • Encoding gives "'ascii' codec can't encode character … ordinal not in range(128)"

    - by user140314
    I am working through the Django RSS reader project here. The RSS feed will read something like "OKLAHOMA CITY (AP) — James Harden let". The RSS feed's encoding reads encoding="UTF-8" so I believe I am passing utf-8 to markdown in the code snippet below. The em dash is where it chokes. I get the Django error of "'ascii' codec can't encode character u'\u2014' in position 109: ordinal not in range(128)" which is an UnicodeEncodeError. In the variables being passed I see "OKLAHOMA CITY (AP) \u2014 James Harden". The code line that is not working is: content = content.encode(parsed_feed.encoding, "xmlcharrefreplace") I am using markdown 2.0, django 1.1, and python 2.4. What is the magic sequence of encoding and decoding that I need to do to make this work? Thanks.

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  • Any way to have delayed_job execute some run-once code at startup and use across all jobs?

    - by Rob Cameron
    So I've got a delayed_job task that pushes some info to an XMPP server. Ideally you create a connection to XMPP once and then constantly push data to it, rather than creating a new connection every time you have some data to send. Is there any kind of facility in delayed_job for running a sort of 'setup' method when a worker starts, have it set some instance variables (like the XMPP connection object) that can then be used by all the jobs that come up? It's okay if each worker runs its own setup method. I just don't want every job (thousands per day) connecting to the XMPP server from scratch every time. Thanks for any help!

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  • Posting null values via AJAX

    - by nickf
    Using the jQuery $.post function, if you send a null value, it arrives at the server side as "null". Example: Javascript: $.post('test.php', { foo : null }); PHP: var_dump($_POST['foo']); // string(4) "null" I understand why this is so, but was wondering the best way to work around the limitation? Should you: Loop through all the variables in JS before you send them and replace with an empty string? Interpret "null" as null on the server side? Don't send the variable at all? Something else?

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  • Create a triangle out of stars using only recursion

    - by Ramblingwood
    I need to to write a method that is called like printTriangle(5);. We need to create an iterative method and a recursive method (without ANY iteration). The output needs to look like this: * ** *** **** ***** This code works with the iterative but I can't adapt it to be recursive. public void printTriangle (int count) { int line = 1; while(line <= count) { for(int x = 1; x <= line; x++) { System.out.print("*"); } System.out.print("\n"); line++; } } I should not that you cannot use any class level variables or any external methods. Thanks.

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  • Question about the lifecycle of a simple Android application

    - by jul
    Hi, I've got a simple application with 3 activities: -the first contains a search box which calls a web service and show the results (restaurants) below in a listview -when a restaurant is clicked another activity is started showing the description of the restaurant and a button "show map" -when the button "show map" is clicked, guess what, the map is shown in a third activity. All the data is loaded in the first activity by a web service (restaurant descriptions and coordinates), and data required by each activity is passed in a bundle using "intent.putExtra". Now everything seems to run smoothly when clicking on the back button (eg. clicking on the back button from the map resumes the "restaurant description" activity with all data set properly), while I haven't done anything about the lifecycle yet. Why? Are all variables saved automatically? Should I use onSaveInstanceState() and onRestoreInstanceState() anyway? Thanks Jul

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  • Netbeans Java SE GUI Builder: private initComponents() problem

    - by maSnun
    When I build a GUI for my Java SE app with Netbeans GUI builder, it puts all the codes in the initComponents() method which is private. I could not change it to public. So, all the components are accessible only to the class containing the UI. I want to access those components from another class so that I can write custom event handlers and everything. Most importantly I want to separate my GUI code and non-GUI from each other. I can copy paste the GUI code and later make them public by hand to achieve what I want. But thats a pain. I have to handcraft a portion whenever I need to re-design the UI. What I tried to do: I used the variable identifier to make the text box public. Now how can I access the text box from the Main class? I think I need the component generated in a public method as well. I am new to Java. Any helps? Here's the sample classes: The UI (uiFrame.java) /* * To change this template, choose Tools | Templates * and open the template in the editor. */ /* * uiFrame.java * * Created on Jun 3, 2010, 9:33:15 PM */ package barcode; import java.util.logging.Level; import java.util.logging.Logger; import javax.swing.JFileChooser; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; import net.sourceforge.barbecue.output.OutputException; /** * * @author masnun */ public class uiFrame extends javax.swing.JFrame { /** Creates new form uiFrame */ public uiFrame() { try { try { // Set cross-platform Java L&F (also called "Metal") UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException ex) { Logger.getLogger(uiFrame.class.getName()).log(Level.SEVERE, null, ex); } catch (InstantiationException ex) { Logger.getLogger(uiFrame.class.getName()).log(Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { Logger.getLogger(uiFrame.class.getName()).log(Level.SEVERE, null, ex); } catch (UnsupportedLookAndFeelException ex) { Logger.getLogger(uiFrame.class.getName()).log(Level.SEVERE, null, ex); } } finally { } initComponents(); } /** This method is called from within the constructor to * initialize the form. * WARNING: Do NOT modify this code. The content of this method is * always regenerated by the Form Editor. */ @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { label1 = new javax.swing.JLabel(); textBox = new javax.swing.JTextField(); saveButton = new javax.swing.JButton(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); label1.setFont(label1.getFont().deriveFont(label1.getFont().getStyle() | java.awt.Font.BOLD, 13)); label1.setText("Type a text:"); label1.setName("label1"); // NOI18N saveButton.setText("Save"); saveButton.addMouseListener(new java.awt.event.MouseAdapter() { public void mousePressed(java.awt.event.MouseEvent evt) { saveButtonMousePressed(evt); } }); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(56, 56, 56) .addComponent(textBox, javax.swing.GroupLayout.PREFERRED_SIZE, 272, javax.swing.GroupLayout.PREFERRED_SIZE) .addContainerGap(72, Short.MAX_VALUE)) .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() .addContainerGap(154, Short.MAX_VALUE) .addComponent(saveButton, javax.swing.GroupLayout.PREFERRED_SIZE, 102, javax.swing.GroupLayout.PREFERRED_SIZE) .addGap(144, 144, 144)) .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() .addContainerGap(140, Short.MAX_VALUE) .addComponent(label1, javax.swing.GroupLayout.PREFERRED_SIZE, 133, javax.swing.GroupLayout.PREFERRED_SIZE) .addGap(127, 127, 127)) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addComponent(label1, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(textBox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(saveButton) .addContainerGap(193, Short.MAX_VALUE)) ); pack(); }// </editor-fold> @SuppressWarnings("static-access") private void saveButtonMousePressed(java.awt.event.MouseEvent evt) { JFileChooser file = new JFileChooser(); file.showSaveDialog(null); String data = file.getSelectedFile().getAbsolutePath(); String text = textBox.getText(); BarcodeGenerator barcodeFactory = new BarcodeGenerator(); try { barcodeFactory.generateBarcode(text, data); } catch (OutputException ex) { Logger.getLogger(uiFrame.class.getName()).log(Level.SEVERE, null, ex); } } /** * @param args the command line arguments */ // Variables declaration - do not modify private javax.swing.JLabel label1; private javax.swing.JButton saveButton; public javax.swing.JTextField textBox; // End of variables declaration } The Main Class (Main.java) package barcode; import javax.swing.JFrame; public class Main { public static void main(String[] args) { JFrame ui = new uiFrame(); ui.pack(); ui.show(); } }

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  • Body class for controller in Rails app.

    - by Vincent
    Currently I have this in my layout: <body class="<%= controller.controller_name %>"> I want to add an additional class that will be the same for all actions in any controller where it's set, something like: class SomeController < ApplicationController body_class 'page' ... end class AnotherController < ApplicationController body_class 'page' ... end Which will result in: <body class="some page"> <body class="another page"> What would be the easiest way to achieve this? Can I use controller class variables for this?

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  • Is it better to echo javascript in raw format with php, or echo a script include that has been minif

    - by Scarface
    Hey guys quick question, I am currently echoing a lot of javascript that is based conditionally on login status and other variables. I was wondering if it would be better to simply echo the script include like <script type="text/javascript" src="javascript/openlogin.js"></script> that has been run through a minifying program and been gzipped or to echo the full script in raw format. The latter suggestion is messier to me but it reduces http requests while the latter would probably be smaller but take more cpu? Just wondering what some other people think. Thanks in advance for any advice.

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  • Screening (multi)collinearity in a reggresion model

    - by aL3xa
    I hope that this one is not going to be "ask-and-answer" question... here goes: (multi)collinearity refers to extremely high correlations between predictors in the regression model. How to cure them... well, sometimes you don't need to "cure" collinearity, since it doesn't affect regression model itself, but interpretation of an effect of individual predictors. One way to spot collinearity is to put each predictor as a dependent variable, and other predictors as independent variables, determine R2, and if it's larger than .9 (or .95), we can consider predictor redundant. This is one "method"... what about other approaches? Some of them are time consuming, like excluding predictors from model and watching for b-coefficient changes - they should be noticeably different. Of course, we must always bare in mind specific context/goal of analysis... Sometimes, only remedy is to repeat a research, but right now, I'm interested in various ways of screening redundant predictors when (multi)collinearity occurs in a regression model.

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  • MSVCRTD.lib(cpu_disp.obj) : warning LNK4210: .CRT section exists; there may be unhandled static init

    - by Johan
    Hi I know this question has popped up before but I could not find a good answer so I try here. I have a pure C dll (Win32) and I get this warning when compiling: MSVCRTD.lib(cpu_disp.obj) : warning LNK4210: .CRT section exists; there may be unhandled static initializers or terminators Everything seems to work just fine but I am concerned about this warning since I do not understad it. I have quite a few static variables but I do not understand what ".CRT section exist" means. What approach should I take to eliminate this warning. When I try to add the libs msdn suggests I get a ton of linker errors.

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  • Cuda program results are always zero in HW, correct in EMU??

    - by Orion Nebula
    Hi all! I am having a weird problem .. I have written a CUDA code which executes correctly in emulation and all results show up.. however, when executed on hardware "G210" .. the results in the result memory are always 0 I am passing two vectors to the kernel, one with random variables the other is initialized to zero, the code copies the first vector to shared memory, does some swapping and other operations and then writes back the results on the second vector (the one with the initial 0's) I am using double precision, the -arch sm13 flag is used, all memory allocation also use sizeof(double) .. I have checked if the kernel is invoked, it does .. so no problems here .. the cudaMemCpy has no problems .. what could be the problem .. :( why would it work in emulation but not on HW I am quite confused .. any ideas?

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  • How to get the first non-null value in Java?

    - by froadie
    Is there a Java equivalent of SQL's COALESCE function? That is, is there any way to return the first non-null value of several variables? e.g. Double a = null; Double b = 4.4; Double c = null; I want to somehow have a statement that will return the first non-null value of a, b, and c - in this case, it would return b, or 4.4. (Something like the sql method - return COALESCE(a,b,c)). I know that I can do it explicitly with something like: return a != null ? a : (b != null ? b : c) But I wondered if there was any built-in, accepted function to accomplish this.

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  • Basic PHP question for Drupal Views theming

    - by oalo
    My PHP and programming knowledge is extremely basic, so this is probably a dumb question: I am theming a View in Drupal 6, and I want to add an id with a consecutive number to each item in the view (first item would have the id #item1, the second #item2, etc). I am customizing the style output (views-view-unformatted--MYVIEWNAME.tpl.php) and the row style output (views-view-fields--MYVIEWNAME.tpl.php), and I want to add a counter variable in the foreach loop in the style output tpl, and then use that variable in the row style output tpl, but the last one is not recognizing the variable. It does not give me any errors, but doesnt print the number. I understand this has probably something to do with variables visibility, how can I declare the counter variable in the style .tpl so I can the use it in the row style .tpl? Thank you

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  • For what purpose does java have a float primitive type?

    - by Roman
    I heard plenty times different claims about float type in java. The most popular issues typicaly regard to converting float value to double and vice versa. I read (rather long time ago and not sure that it's actual now with new JVM) that float gives much worse performance then double. And it's also not recommended to use float in scientific applications which should have certain accuracy. I also remember that when I worked with AWT and Swing I had some problems with using float or double (like using Point2D.Float or Point2D.Double). So, I see only 2 advantages of float over double: it needs only 4 bytes while double needs 8 bytes JMM garantees that assignment operation is atomic with float variables while it's not atomic with double's. Are there any other cases where float is better then double? Do you use float's in your applications? It seems to me that the only valuable reason java has float is backward compatibility.

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  • Changing properties of controls that were added at runtime

    - by user257412
    I have a form in which several buttons are added at runtime via a 'for' method public Form() { for (int i = 0 ... ) Button b = new Button() b.text = (string) i ; etc.. etc.. } . now i wish to change the text property of the buttons on a certain event. How can this be accomplished? I have tried a few things but none worked.. since the buttons variables are inside the method , they are not available outside. Thanks

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  • ASP.Net: User control with content area, it's clearly possible but I need some details.

    - by bert
    I have seen two suggestions for my original question about whether it is possible to define a content area inside a user control and there are some helpful suggestions i.e. http://stackoverflow.com/questions/1971498/passing-in-content-to-asp-net-user-control and http://stackoverflow.com/questions/1912283/asp-net-user-control-inner-content Now, I like the theory of the latter better than the former just for aesthetic reasons. It seems to make more sense to me but the example given uses two variables content and templateContent that the answerer has not defined in their example code. Without these details I have found that the example does not work. I guess they are properties of the control? Or some such? The former example seems workable but I'd prefer to go with the latter if someone could fill in the blanks for me. Thanks.

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