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• Design pattern for extending Android's activities?

  - by Carl

  While programming on Android, I end up writing a parent activity which is extended by several others. A bit like ListActivity. My parent activity extends Activity. if I intend to use a Map or a List, I can't use my parent activity as superclass - the child activity can only extend one activity obviously. As such I end up writing my parent activities with the same logic for Activity, ListActivity, MapActivity and so forth. What am I looking for is some sort of trait functionality/design pattern which would help in this case. Any suggestions?

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• Extending Zend_Auth_Adapter_DbTable for Extra Checks

  - by Urda

  My google fu is weak today, but I cannot find a good article to do so. I would like to extend the Zend Adapter to check n extra columns on my database table. What is the best way to fully extend the adapter, so I can use it in the future without needing to dig through documentation again.

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• Turning one file with lots of classes to many files with one class per file

  - by Ole Jak

  How do I turn one file with lots of classes to many files with one class per file? (C\C++) So I have that file with such structure: Some includes and then lots of classes that sometimes call each other: #include <wchar.h> #include <stdlib.h> //... class PG_1 { //... } class PG_2 { //... } //...... class PG_N { //... }

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• Java: Make a method abstract for each extending class

  - by Martijn Courteaux

  Hi, Is there any keyword or design pattern for doing this? public abstract class Root { public abstract void foo(); } public abstract class SubClass extends Root { public void foo() { // Do something } } public class SubberClass extends SubClass { // Here is it not necessary to override foo() // So is there a way to make this necessary? // A way to obligate the developer make again the override } Thanks

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• Explain Type Classes in Haskell

  - by Tsubasa Gomamoto

  Hi, I am a C++ / Java programmer and the main paradigm I happen to use in everyday programming is OOP. In some thread I read a comment that Type classes are more intuitive in nature than OOP. Can someone explain the concept of type classes in simple words so that an OOP guy like me can understand it?

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• Django extending user model and displaying form

  - by MichalKlich

  Hello, I am writing website and i`d like to implement profile managment. Basic thing would be to edit some of user details by themself, like first and last name etc. Now, i had to extend User model to add my own stuff, and email address. I am having troubles with displaying form. Example will describe better what i would like achieve. This is mine extended user model. class UserExtended(models.Model): user = models.ForeignKey(User, unique=True) kod_pocztowy = models.CharField(max_length=6,blank=True) email = models.EmailField() This is how my form looks like. class UserCreationFormExtended(UserCreationForm): def __init__(self, *args, **kwargs): super(UserCreationFormExtended, self).__init__(*args, **kwargs) self.fields['email'].required = True self.fields['first_name'].required = False self.fields['last_name'].required = False class Meta: model = User fields = ('username', 'first_name', 'last_name', 'email') It works fine when registering, as i need allow users to put username and email but when it goes to editing profile it displays too many fields. I would not like them to be able to edit username and email. How could i disable fields in form? Thanks for help.

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• Extending visio

  - by Élodie Petit

  I need to extend Visio workflow template for SharePoint 2010 workflow to add my own activity symbols etc. Anyone can direct me to a reference or tutorial?

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• use JQuery to get a list of classes

  - by John

  Hi I have a un-ordered (ul) html list. Each li item has 1 or more classes attached to it. I want to go through this ul list and get all the (distinct) classes. Then from this list create a list of checkboxes who's value matches that of the class and also who's label matches that of the class. One checkbox for each class. What is the best way to do this using JQuery? Thanks

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• Django design question: extending User to make users that can't log in

  - by jobrahms

  The site I'm working on involves teachers creating student objects. The teacher can choose to make it possible for a student to log into the site (to check calendars, etc) OR the teacher can choose to use the student object only for record keeping and not allow the student to log in. In the student creation form, if the teacher supplies a username and a password, it should create an object of the first kind - one that can log in, i.e. a regular User object. If the teacher does not supply a username/password, it should create the second type. The other requirement is that the teacher should be able to go in later and change a non-logging-in student to the other kind. What's the best way to design for this scenario? Subclass User and make username and password not required? What else would this affect?

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• Extending a module multiple times in Drupal

  - by rpSetzer

  I created a nice extension for Drupal based on the webform module. Now, I need to implement different functionality that is also based on the webform module. What is the best way to do this?

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• Extending ClaimsIdentity in MVC3

  - by Steoates

  I've got my claims set-up with MVC3 using azure and everything is going well. What I need to do now is extend the Claims Identity that's in the current thread / http context and add my own information (DOB, Address.. that sort of stuff) so my question is - where is the best place to do this? any examples would be great.. I presume that when the user is authenticated id then have to go to the DB and pull back the relevant record for the user then add it to the custom Claims Identity object? cheers. ste.

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• Explicitly extending Object class and calling clone method of object throwing error

  - by Suresh S

  i tried the following code for cloning the object. while compiling it shows clone is protected and cannot be accessed, but i had extended Object class, hence the clone method will be public to my class . please explain me the reason. class storeDate extends Object { public static void main(String[] args) { storeDate d = new storeDate(); Object o = (storeDate)d; o.clone(): } }

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• extending the delphi TEditCopy action to also copy listbox items to clipboard

  - by PA

  I have a form with most of its functionality implemented using standard TAction. I have a menu, a toolbar, and some toobuttons. I have implemented clipboard copy/paste with no code at all, just using TEditCopy and TEditPaste actions. It works perfect in the TEdit and TMemo boxes I have. Now, I want it to work with TListBox, too. Specifically, I want to be able to copy the selected list item in a TListBox using the very same menuitems, key shortcuts and toolbuttons. So, I believe I will need to extend the TEditCopy Action. But it doesn't seem very straight forward to me. In particular, the TEditAction checks for the focused control to be a TCustomEdit control, which a TListBox it is not. I am a little affraid that it will be just too much work. The obvious alternative is to just forget about the standard actions and implement the copy to clipbard in the OnExecute method of a generic TAction. But, before giving up, do you have some idea, hint or trick that would help me extend the standard TEditCopy action?

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• GWT: Javascript implementation of JRE classes

  - by chris_l

  Sometimes I'd like to take a peek into the implementation of the JRE classes, which is used to generate the JavaScript code. For some classes, I can find a corresponding implementation by guessing its name, e.g. com.google.gwt.core.client.impl.StringBuilderImpl. But where's the implementation for java.util.Date for example? Where do I find it, and how does GWT find it (via some configuration file?)

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• C++ Headers/Source Files

  - by incrediman

  (Duplicate of C++ Code in Header Files) What is the standard way to split up C++ classes between header and source files? Am I supposed to put everything in the header file? Or should I declare the classes in the header file and define them in a .cpp file (source file)? Sorry if I'm shaky on the terminology here (declare, define, etc). So what's the standard?

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• Extending / changing how Zend_Search_Lucene searches

  - by Grant Collins

  Hi, I am currently using Zend_Search_Lucene to index and search a number of documents currently at around a 1000 or so. What I would like to do is change how the engine scores hits on a document, from the current default. Zend_Search_Lucene scores on the frequency of number of hits within a document, so a document that has 10 matches of the word PHP will score higher than a document with only 3 matches of PHP. What I am trying to do is pass a number of key words and score depending on the hits of those keywords. e.g. I pass 5 key words say,PHP, MySQL, Javascript, HTML and CSS that I search against the index. One document has 3 matches to those key words and one document has all 4 matches, the 4 matches scores the highest. The number of instances of those words in the document do not concern me. Now I've had a quick look at Zend_Search_Lucene_Search_Similarity however I have to confess that I am not sure (or that bright) to know how to use this to achieve what I am after. Is what I want to do possible using Lucene or is there a better solution out there?

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• Implementation for already available classes in Ruby

  - by Tarun

  Hi All, I am a Java Developer and a newbie in Ruby. Does Ruby not implement available classes in Ruby lang itself(as done in Java). Actually I have downloaded the code for Ruby and was trying to find the implementation for classes like Fixnum, etc. But could not find it.

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• Extending battery life on laptop while programming?

  - by Matthew Watson

  I often program outside away from power, how can I extend the battery life in my laptop to let me program longer without having to "return to base" Specifically for a MacBook Pro.

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• iPhone - extending a class delegate

  - by Digital Robot

  OK, I know how to create a class extension, using something like that: on .h @interface UIButton (myExtensionName) // my extended methods @end and then on .m @implementation UIButton (myExtensionName) // my implementations @end But how do I declare the extended delegates I may create? If this was a normal class I would do @protocol myExtensionName <NSObject> // my delegate declarations @end but how do I do that on a class extension? thanks

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• extending jquery on the main element object

  - by Blankman

  I've seen some jquery code where people extend the main object like: $('someId').myCustomObject(); Is this possible or am I mistaken? (if yes, how?)

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• extending spring form tag library attributes

  - by TimmyJ

  I'm using Spring's form tag library in a Spring MVC application that I am developing. The company I am working for has implemented some company-wide policies based on the definition of custom attributes for certain tags. For instance, by default (though the inclusion of a standard javascript file) all tags have their values automatically converted to upper case. In order to disable this one would define their tag with a custom attribute in the following way: <input type="text" uppercase="false" /> The problem is that the addition of these custom attributes to a spring:form tag causes an error at runtime. I've pasted the error below. org.apache.jasper.JasperException: /WEB-INF/jsp/reportCriteria.jsp(45,5) Attribute uppercase invalid for tag input according to TLD My question is: is there any way to extend the TLD to allow for these attributes, or is there any other way add these custom attributes to these spring:form tags?

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• C++ compiler maximum number of classes

  - by aaa

  hello. In meta-programming number of classes grows quite fast. Is maximum number of classes modern compiler allows, for example g++, something to be concerned about? Thank you

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• Override jre_lib classes

  - by Filip

  What is the best way to override jre_lib classes? Let's say I need to store all ArrayLists not in RAM but on disk or anywhere else. I wanna write my own ArrayList class to code this functionality and make sure that every instantiations of ArrayList use my class. I thought about class loading mechanism to change order of classpath, but as I see java checks standard classes first.

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• Template classes and include guards in C++

  - by Bill Kotsias

  Is it wise to have include guards around template classes? Aren't template classes supposed to be reparsed each time you reference them with a different implementation? N.B In Visual C++ 2008 I get no errors combining the two...

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• php extending but with a new constructor...possible?

  - by Patrick

  I have a class: class test { function __construct() { print 'hello'; } function func_one() { print 'world'; } } what I would like to do is a have a class that sort of extends the test class. I say 'sort of', because the class needs to be able to run whatever function the test class is able to run, but NOT run the construct unless I ask it to. I do not want to override the construct. Anyone has any idea how to achieve this?

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