factory-pattern

I have a GUI application. In it I allow a user to select from a container-provided list of algorithms. Each algorithm will be kicked off as a background task in another view. I need to support multiple instances of this view, and support multiple instances of the same algorithm. That view will also be provided by the container. The algorithm is also stateful. So I have a case where I need to create instances of my view and algorithm and bind them together at runtime. I don't have static binding points for these instances, so I can't use the normal injection facilities (constructor or property

I don't believe I am implementing the factory pattern correctly because the Application class' createDocument method accepts any class type, not just subclasses of Document . In other words, is there a way I can restrict the createDocument method to only accept subclasses of Document ? Document.java package com.example.factory; public abstract class Document { public Document() { System.out.println("New Document instance created: " + this.toString()); } } DrawingDocument.java package com.example.factory public class DrawingDocument extends Document { public DrawingDocument() { System.out

I have a factory object ChallengeManager to generate instances of a Challenge object for a game I'm building. There are many challenges. The constructors for each Challenge class derivation are different, however there is a common interface among them, defined in the base class. When I call manager.CreateChallenge() , it returns an instance of Challenge , which is one of the derived types. Ideally, I would like to keep the code for the object construction inside the derived class itself, so all the code related to that object is co-located. Example: class Challenge {} class ChallengeA :

I am putting together an explanation and code example of this design pattern, attempting to help others around me grasp it (along with helping myself to master the pattern as well). What I am looking for is opinions & or critique of my explanation and code sample...thanks! What is the factory pattern? The factory pattern utilizes a particular dedicated "object creator object" to handle creation of - and most times instantiation of - objects, similar to a real world factory. Real world example Think of an automobile factory being the creator of various types of automobiles. One of the assembly

A continuation from Dependency injection, delayed injection praxis . I have the Main class: package test; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.stereotype.Component; import java.util.List; import java.util.Scanner; @Component public class Main { @Autowired private StringValidator stringValidator; @Autowired private StringService stringService; @Autowired private ValidationService validationService; public void main

I'm looking for a simple example of how to implement a factory class, but without the use of a Switch or an If-Then statement. All the examples I can find use one. For example, how could one modify this simple example (below) so that the actual factory does not depend on the Switch? It seems to me that this example violates the Open/Close principle. I'd like to be able to add concrete classes ('Manager', 'Clerk', 'Programmer', etc) without having to modify the factory class. Thanks! class Program { abstract class Position { public abstract string Title { get; } } class Manager : Position {

I was wondering how I could implement the simple factory pattern with Spring 3 annotations. I saw in the documentation that you can create beans that call the factory class and run a factory method. I was wondering if this was possible using annotations only. I have a controller that currently calls MyService myService = myServiceFactory.getMyService(test); result = myService.checkStatus(); MyService is an interface with one method called checkStatus(). My factory class looks like this: @Component public class MyServiceFactory { public static MyService getMyService(String service) { MyService

Any help is appriciated. I'm working on a C++ factory pattern and i get this error. 1>c:\users\brian\documents\visual studio 2010\projects\cst276lab_3\guitar.hpp(456): error C2259: 'ElectricGuitarComponentFactory' : cannot instantiate abstract class This is my code: ///////////////////////guitar class//////////////////// class Guitar { private: std::string _name; protected: mutable std::auto_ptr< HeadStock > _HeadStock; protected: mutable std::auto_ptr< NeckStrap > _NeckStrap; protected: mutable std::vector< Bridge* > _Bridge; protected: mutable std::auto_ptr< Strings > _Strings; protected: