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• Parent child class relationship design pattern

  - by Jeremy

  I have a class which has a list of child items. Is there a design pattern I can copy that I can apply to these classes so that I can access the parent instance from the child, and it enforces rules such as not being able to add the child to multiple parents, etc?

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• Post Redirect Get pattern and use in a RESTful resource-based service when supporting searching

  - by AWC

  If I have a HTTP based RESTful service and I want to POST a search resource and use the PRG pattern for returning the URL to the search-result resource, I have to persist the search-result resource on the server. Is this a good idea? If I do persist the search-result resource how long is it persisted for? Can I control this by a HTTP header of some kind? Cheers AWC

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• Makefile generic pattern rule -- xyzzy-en_US.ext2 from xyzzy.ext0

  - by Janne Savukoski

  I can't figure out a way to define a generic pattern rule for the following kind of production with make: require xyzzy-en_US.ext2 from xyzzy.ext0 via xyzzy.ext1. This works: all: xyzzy-en_US.ext2 # to be compiled from xyzzy.ext0 %.ext1 : %.ext0 # produce xyzzy.ext1 %-en_US.ext2 : %.ext1 # produce xyzzy-en_US.ext2 But how to generalize the locale part of the second rule? Or do I need to generate rules for all different locales? Neither of these work: %-??_??.ext2 : %.ext1 # ... %.ext2 : $(@,%-??_??.ext2,%.ext1) # ...

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• [bash] Escape a string for sed search pattern

  - by Alexander Gladysh

  In my bash script I have an external (received from user) string, which I should use in sed pattern. REPLACE="<funny characters here>" sed "s/KEYWORD/$REPLACE/g" How can I escape the $REPLACE string so it would be safely accepted by sed as a literal replacement? NOTE: The KEYWORD is a dumb substring with no matches etc. It is not supplied by user.

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• Simple but good pattern for EJB

  - by Sara

  What would you suggest as a good and practical but simple pattern for a soloution with: HTML + JSP (as a view/presentation) SERVLETS (controller, request, session-handling) EJB (persistence, businesslogic) MySQL DB And is it necessary to use an own layer of DAO for persistence? I use JPA to persist objects to my DB. Should I withdraw business logic from my EJB? Sources online all tell me different things and confuses me...

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• Python singleton pattern

  - by Javier Garcia

  Hi, someone can tell me why this is incorrect as a singleton pattern: class preSingleton(object): def __call__(self): return self singleton = preSingleton() a = singleton() b = singleton() print a==b a.var_in_a = 100 b.var_in_b = 'hello' print a.var_in_b print b.var_in_a Edit: The above code prints: True hello 100 thank you very much

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• Php preg_replace pattern help

  - by christian

  I have this text: Lorem ipsum dolor sit {something.something({print.print(param1,param2)},param2)}, consectetur adipiscing elit. Where i need a pattern that can replace everything but: something.something The text something.something can contain [a-zA-Z.] (I am using preg_replace) Here is a site where you can test the code: http://www.spaweditor.com/scripts/regex/index.php

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• Disposable Registry: good pattern?

  - by illdev

  Imagine a: public class Global : IDisposable { private static readonly List<IDisposable> Disposables = new List<IDisposable>(); public void ApplicationStart() { var heavyLifter = new HeavyLifter(); Disposables.Add(heavyLifter); } public void Dispose() { Disposables.ForEach(d => d.Dispose()); } } I am somewhat inexperienced with IDisposable. Is this a viable pattern?

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• php regular expression to match specific url pattern

  - by zen

  I'd like to "grab" a few hundred urls from a few hundred html pages. Pattern: <h2><a href="http://www.the.url.might.be.long/urls.asp?urlid=1" target="_blank">The Website</a></h2>

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• Is there a pattern for this?

  - by Timmy

  i have something that requires a matrix of values, similar to pokemon: i have a class object for each of the types, is there a pattern or a good way to implement this, as a middle layer or in the classes?

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• Python pattern search in a string

  - by Hulk

  In python if a string contains the following, print valid_str The output of this is Record is positive in tone: It emphasizes "what a child can do and his or her achievements, as opposed to what he or she cannot do," explains the It is useful for progress and achievements during office conferences How to search for the pattern It is useful in the above string and if not found return something. Thanks..

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• ASP.net Intergation Pattern - examples

  - by nettguy

  Recently lot of interviewers are asking "What are the integration patterns are you familiar with?". I know design patterns,what is integration pattern then?

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• javascript regex pattern concatenate with variable

  - by chazzuka

  How to create regex pattern which is concatenate with variable, something like this: var test ="52"; var re = new RegExp("/\b"+test+"\b/"); alert('51,52,53'.match(re)); Thanks

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• Is the provider pattern an implementation of IOC?

  - by blahblah

  Is the provider pattern an implementation of IOC? If not, why not? (reading through martin fowlers article on ioc)

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• Activator.CreateInstance vs Factory Pattern

  - by Heka

  What is the difference between Activator.CreateInstance and factory? Can they be used interchangeably? Or stil do we need a factory pattern?

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• Getting pattern string from java SimpleDateFormat

  - by D Lawson

  I have a SimpleDateFormat object that I retrieve from some internationalization utilities. Parsing dates is all fine and good, but I would like to be able show a formatting hint to my users like "MM/dd/yyyy". Is there a way to get the formatting pattern from a SimpleDateFormat object?

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• How to implement MVP pattern for a tabcontrol?

  - by John_Sheares

  I have an application that has a tabcontrol with 5 tabpages of information that user interacts with. Also, there are contextual menus and toolbars for editing and formatting the information. Do I create a different view & presenter for each tab page or the tabcontrol iteself? How do I apply the pattern to the toolbars and menus that can interact with any of the tabs?

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• Is it good, that every PHP class implements a Singleton pattern

  - by Sbioko

  Hello, is it good, that every PHP class implements a Singleton pattern? I think, it will be less memory usage because of it. Is it right opinion? Thanks!

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• DI and Singleton Pattern in one implementation

  - by Tony

  I want to refactor some code using the Windsor IOC/DI framework, but my issue is that I have some Singleton classes and Factory pattern classes and I am not sure that one can implement a Singleton or Factory using DI. Has anyone any ideas if that is possible and how?

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• pattern to transfer search model to dao

  - by zeroed

  We have a dao as a project (jar file). Clients use its interfaces and factories to operate with database. Using standard CRUD operations, dao allows you to search an entity by some search criteria. What is the best way to represent this criteria? Is transfer object appropriate pattern in this situation? How should client create SearchModel instance? Please, share. Regards.

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• Design pattern to separate messages from actual process.

  - by Manish Gupta

  I am having a C# application to sync data between PC and palm devices. There are codes written like below: showMessage("synchronizing Table1"); Sync(destTable1,sourceTable1); Sync(destTable2,sourceTable2); showMessage("synchronizing Table2"); // more code How do I separate the actual process of synchronizing from displaying message? Which design pattern to follow? Thanks in advance...

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• Name the pattern - Create, Set, Execute, Destroy?

  - by Seb Nilsson

  I somewhere heard that the .NET Framework was built around specific pattern, which they tried to uphold as much as possible. var rsa = new RSACryptoServiceProvider(); // Create rsa.ImportParameters(GetParameters()); // Set byte[] encrypted = rsa.Encrypt(data, true); // Execute // Destroyed by garbage-collector Are there any variants of this? What are the general pros and cons?

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• Decorator Design Pattern - Not Possible

  - by Lennie

  Hi, This is more a design question... You can't do a decorate design pattern if: 1) The object is marked "sealed" meaning you can't extend from it. 2) or you want to override a method but its not virtual. What can you do then? Taken that you can't change the class source code if you don't have the source code (like a 3rd party library).

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• Pattern for creating a database schema using JDBC

  - by Space_C0wb0y

  I have a Java-application that loads data from a legacy file format into an SQLite-Database using JDBC. If the database file specified does not exist, it is supposed to create a new one. Currently the schema for the database is hardcoded in the application. I would much rather have it in a separate file as an SQL-Script, but apparently there is now easy way to execute an SQL-Script though JDBC. Is there any other way or a pattern to achieve something like this?

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• Acquisition Design pattern

  - by Tony

  Anybody any idea where I can find details about this pattern? It is used in relation to threading. C++

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