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Topic: Factory method pattern

Ads by Google Related Topics Factory method pattern design pattern computer science Design Patterns software design pattern Perl Design Patterns Book pattern language Anti patterns Visitor pattern      Factory object - Wikipedia, the free encyclopedia In object-oriented computer programming, a factory object is an object for creating other objects. Factory objects are used in situations where getting hold of an object of a particular kind is a more complex process than simply creating a new object. A factory object typically has a method for every kind of object it is capable of creating. http://en.wikipedia.org/wiki/Factory_object      Abstract factory pattern - Wikipedia, the free encyclopedia In software development, a Factory is the location in the code at which objects are constructed. If all factory objects are stored globally in a singleton object, and all client code goes through the singleton to access the proper factory for object creation, then changing factories is as easy as changing the singleton object. However, employment of this pattern, as with similar design patterns, incurs the risk of unnecessary complexity and extra work in the initial writing of code. http://en.wikipedia.org/wiki/Abstract_factory_pattern      Factory method design pattern Factory methods can also be used in programs to do mathematical computations. Design patterns such as the factory method are important because they give you an idea to solve a recurrent problem. For example the factory method can be used when doing the computations for the Fast Fourier Transform (Pattern Depot, 2004). http://pages.cpsc.ucalgary.ca/~ansella/seng443      Kids.net.au - Encyclopedia Design pattern (computer science) - Design patterns are lessons that have been accumulated in the community of computer programming. A design pattern is an abstraction of the best solutions for a particular class of problems. It is important that patterns accompany a name because it makes possible to describe problems, solutions and talk about them with other folks. http://www.kids.net.au/encyclopedia-wiki/de/Design_pattern_(computer_science)      : Pattern Factory, review at WorldSSP.net The selector for a Factory method should be of the form #newXxxxxx, where.Xxxxxx is a description (not the class) of the resultant object. Pattern Factory integration with Advantage Plex for Distributed Systems The PatternFactory solution fits to the pattern architecture of the Advantage™ Plex product, where pattern libraries can be added for reuse purposes, providing additional pattern libraries of various size and content. Factory Method(Creational) Design PatternGopalan Suresh Raj The Problem One of the goals of object-oriented design is to delegate responsibility among different objects. http://www.worldssp.net/webinfo.asp?proid=19984      Thomas Chau's Web Site > Course Works Abstract Factory pattern is different from Factory Method in that the former is intended for families of related objects are created in a class whereas the later is intended for creating only one object in a class. The best known example is to centralize the responsibility of creating particular objects in a class or a method when your application does not/cannot know the particular class of objects that it is instantiating. The consequences of using this pattern is increased flexibility of using the desired product since product creation is centralized in one class rather than distributed in all client codes. http://sern.ucalgary.ca/~chauth/courses/seng60904/factoryMethodAbstractFactory.htm      ONDotnet.com: The Factory Design Pattern Factory methods can return any subtype of the type requested, and can require that clients refer to the returned object by its interface, rather than the implementation class. Factory methods can encapsulate the logic required to return a singleton instance of the class requested, or they can return an instance of the requested class from a pool of instances. Unlike constructors, factory methods are not required to create a new object each time they are invoked. http://www.ondotnet.com/pub/a/dotnet/2003/08/11/factorypattern.html      Subject-oriented programming and the factory method pattern The Factory Method pattern depends on a particular coding of the methods being implemented on the original objects (e.g. In any case, once the examiner understands the object creation method call statement and its connection to the factory's class, it is possible to recognize that these things form a Factory Method pattern, and to begin to understand the larger scheme of the code. Because of this, the implementation of the Factory Method pattern must be done in advance of an actual need to exploit its flexibility for a particular piece of software. http://www.research.ibm.com/sop/sopcfmep.htm      Introduction to Design Patterns in Delphi Abstract methods are never implemented in the base class and must be implemented in descendant classes to be used. This pattern is essentially an extension of abstract methods to more complex algorithms. Abstract is used in base classes to declare a method in the interface and defer its implementation to a descendant class. http://www.obsof.com/delphi_tips/pattern.html      [No title] The Factory Method pattern defines an interface for creating an object and lets subclasses decide which class to instantiate. The Factory Method design pattern is defined in the book, Design Patterns - Elements of Reusable Object-Oriented Software. All of these methods are made virtual, so that subclasses can implement their own MakeRoom class which can create a subclass of the Room class. http://www.devhood.com/tutorials/tutorial_details.aspx?tutorial_id=645      Pattern Summaries: Factory Method A complete pattern will also provide reasons to use or not use the solution, the consequences of using the solution and suggestions on how to implement the solution. Suppose you are developing an extension to the Socket class to encrypt the stream of bytes written to a socket and decrypt the bytes read from the socket. The interface would declare a method that the programmer provided class would implement to select and instantiate a class. http://www.developer.com/java/other/article.php/618421      Prefer Factories to Constructors - .NET Developers The idea behind the Factory Method Pattern is that you don't directly create a class, but rather call some method that creates a class on your behalf. Some factory methods are naturally suited to returning collections of the object type rather than a single object. If you're in the "exceptions are for exceptional situations" camp, then you may prefer to return null in expected cases where there is no data (say, the username in the example above is unknown). http://www.dotnetdevs.com/advice/PreferFactories.aspx      jGuru: Abstract Factory VS Factory Method In the factory method design pattern All creaters needs to be subclassed while in Abstract Factory method only one class is need to be subclassed. Abstract factory is a creational pattern for the family of objects. Scope of the Factory method is class level i.e. http://www.jguru.com/forums/view.jsp?EID=1222908      java.net: Principles, Patterns, and Practices: The Factory Pattern Factories are useful when you need to separate the entities that create objects from the type of objects being created. These factories are then passed into the rest of the system, which uses them to create the objects they need. One of the most significant problems with this pattern is that the abstract factory interface is volatile. http://today.java.net/pub/a/today/2005/03/09/factory.html      Create client-side user interfaces in HTML, Part 2 A factory method creates an object that implements a known interface, but you don't know the actual class of the object being created. Be that as it may, this code does demonstrate the Factory Method design pattern in spades—the pattern is used three times in an overlapping fashion. Swing is way too complex for what it does, and it's a good example of going crazy with design patterns without considering whether the resulting system is usable or not. http://www.javaworld.com/javaworld/jw-11-2003/jw-1114-toolbox.html      Design Patterns in PHP - Factory Method and Abstract Factory The first pattern used to simplify object instantiation is the Factory Method pattern. With the first method, if a class name is changed or a new ETF class is added, we have to modify the ETF creation code everywhere it appears in our application. The Factory Method pattern defines an interface for object creation but defers the actual instantiation to subclasses. http://www.devshed.com/c/a/PHP/Design-Patterns-in-PHP-Factory-Method-and-Abstract-Factory/1      Core J2EE Patterns - Data Access Object When the underlying storage is subject to change from one implementation to another, this strategy may be implemented using the Abstract Factory pattern. Consider an example where we are implementing this strategy in which a DAO factory produces many DAOs for a single database implementation (e.g., Oracle). When the underlying storage is not subject to change from one implementation to another, this strategy can be implemented using the Factory Method pattern to produce a number of DAOs needed by the application. http://java.sun.com/blueprints/corej2eepatterns/Patterns/DataAccessObject.html      Unit testing with mock objects While this pattern is very effective for many cases, sometimes the mock object cannot be passed into the object being tested. The source of the factory method and abstract factory design patterns is Design Patterns: Elements of Reusable Object-Oriented Software (Addison-Wesley, 1997) by Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides -- also known as the Gang of Four. This can be as simple as invoking the base class's factory method and asserting that the returned object is of the correct type. http://www-128.ibm.com/developerworks/java/library/j-mocktest.html      Singleton with Factory Method possible? The Factory Method pattern, or "virtual constructor" as it's more commonly known in C++, is simply an interface for creating instances of derived classes without knowing the actual type of the derived class. Passing object Y into methods of class X is a less heinous way to keep Y flexible than making Y a member of X, or a global object. The Factory Method pattern, > or "virtual constructor" as it's more commonly known in C++, is simply > an interface for creating instances of derived classes without knowing > the actual type of the derived class. http://www.codecomments.com/message284101.html      jGuru: Difference between Abstract Factory Pattern and Command Pattern The abstract factory pattern is one level of abstraction higher than the factory method pattern. I very well understand the difference between Abstract factory and Factory method patterns, but not able to really distinguish these two patterns in terms of when to implement these patterns. Factories return one of the several related classes. http://www.jguru.com/forums/view.jsp?EID=1223992      Creational Patterns: Creating Objects in an OO System To define a standard method to create an object, apart from a constructor, but the decision of what kind of an object to create is left to subclasses. Data Access Object [CJ2EEP] – The Data Access Object pattern uses the Factory Method pattern to be able to create specific instances of Data Access Objects without requiring knowledge of the specific underlying database. Olav Maassen and Stephen Stelting discuss several types of creational patterns, which support one of the most common tasks in object-oriented programming—the creation of objects in a system. http://www.informit.com/articles/article.asp?p=26452&seqNum=5      CodeGuru: .NET Remoting and Event Handling in VB .NET, Part 3 The factory method pattern manages the creation of related objects based on some criteria or a compound creational process. For example, the factory method helps when you need to perform several operations to create an object and ensure its proper initialization. In this example, for criteria like the text the user enters and the value that text represents, the factory method can contain the logic in one place to figure out which object to create. http://codeguru.earthweb.com/columns/VB/print.php/c9363__2      SENG 609.04 Design Patterns A potential disadvantage of factory methods is that clients might have to subclass the Creator class just to create a particular ConcreteProduct object. The Proxy pattern introduces a level of indirection when accessing an object. Proxy is applicable whenever there is a need for a more versatile or sophisticated reference to an object than a simple pointer. http://www.ucalgary.ca/~xintan/seng60904/seng609.04.htm      [No title] An abstract factory class defines methods to create an instance of each abstract class that represents a user interface widget. InterViews use this pattern, to define WidgetKit, Dialog Kit abstract factories for generating look-and-feel specific user interface objects. Hence it is best implemented as a Singleton pattern. http://www.csc.calpoly.edu/~mliu/csc568/notes/aFactory.doc      [No title] Factory Method design pattern lab // // Problem. We would like to remove all // dependencies on the President, AttorneyGeneral, and // MinorityPartyCongressPerson classes so that their declarations (and inline // definitions) can be moved below the client code in main(). Use a "member initialization list" to map // the char* argument the constructor receives to the Base class's 1-arg // constructor. http://home.earthlink.net/~huston2/dp/FactoryMethodLabCpp      Ruby: FactoryMethodPattern An example of an object protocol is the behaviour of the methods I'll use the Factory Method pattern to show how to test object protocols. Ruby has no way to specify or check object protocols in the language. http://www.rubygarden.org/ruby?FactoryMethodPattern      Blog this: The Factory Design Pattern The Factory Design Pattern by Amit Goel -- Many popular software libraries make extensive use of design patterns so that the APIs can be abstracted out at a high level for the end programmer. Given that the FCL builds on the strengths of Microsoft's experience with developing software libraries, one can assume that instances of design patterns found in the FCL are fairly appropriate usages of these patterns. http://www.oreillynet.com/cs/user/print/a/4093?x-t=blog_this.view      Factory Method To illustrate how to use factory design pattern with class level implementation, here is a real world example. Template method, which defines a skeleton of an algorithm to defer some steps to subclasses or avoid subclasses You may use several constructors with different parameters to instantiate the object you want. http://www.javacamp.org/designpattern/factory.html      AbstractBranch (dom4j 1.6.1 API) A Factory Method pattern which creates a BackedList implementation used to store results of a filtered content query. If this tree is capable of understanding which attribute value should be used for the ID then it should be used, otherwise this method should return null. A Factory Method pattern which creates an empty a BackedList implementation http://www.dom4j.org/apidocs/org/dom4j/tree/AbstractBranch.html      Automated Support for Framework-Based Software Evolution - Tourw (ResearchIndex) 49 Evolving Frameworks: A Pattern Language for Developing Objec.. 217 Design Patterns for Object-Oriented Software Development (context) - Pree - 1995 ACM 11 Automated Software Evolution via Design Pattern Transformati.. http://citeseer.ist.psu.edu/576677.html      Software Architecture Design Patterns in Java: Current Amazon U.S.A. One-Edition Data Software engineering and computer science students need a resource that explains how to apply design patterns at the enterprise level, allowing them to design and implement systems of high stability and quality.Software Architecture Design Patterns in Java is a detailed explanation of how to apply design patterns and develop software architectures. One of the side-effects was the "Applied Java Patterns" book which I very much liked and used to recommend to anyone looking for a "GoF" replacement using Java for code examples. The viewpoint and purpose of detailed explanation on how to apply design patterns at the enterprise level, design and implement systems of high quality. http://www.hostlinkexchange.biz/stuff-0849321425.html      Fall01 Final Exam Review: Design Patterns In the Factory Method Pattern the ConcreateCreator will return one type of object. In the case of Bridge, it decouples abstractions less to maximise compatibilities than to hide complexities from a user. a)The difference in Factory Method Pattern and Abstract Factory Pattern is the type objects that the ConcreteCreator can create. http://coweb.cc.gatech.edu/cs2340/1868      Factory Method An example of the Factory Method design pattern http://ucsu.colorado.edu/~daviessc/csci4448/lectures/factory_method.htm      Factory Method Pattern ... declare a factory method in a creator class http://www.cse.unsw.edu.au/~cs4001/00s1/lect02/tsld055.htm      [No title] The Factory // Method pattern addresses the notion of "creation" in the context of // frameworks. In this example, the framework knows WHEN a new document // should be created, not WHAT kind of Document to create. Each framework specifies the infrastructure, superstructure, // and flow of control for its "domain", and the client of the framework // may: exercise the framework's default behavior "as is", extend selected // pieces of the framework, or replace selected pieces. http://www.cse.ogi.edu/class/APC506/Samples/Patterns/fm.cpp      clearsoftware.net - joe rinehart on CF and more One of the most commonly used and asked about patterns is the Data Access Object (DAO) pattern. Sad part is, they can't get our CPU util above 50%. This post will introduce you to what they are, how to build them, and where to learn more. http://clearsoftware.net/client/index.cfm?mode=month&month=11&year=2004      Factory Method Design Pattern - Design 3000 Inc Exploring design patterns in real programming, focusing on implementation issues in Delphi....(Continue Reading) Factory Method Design Pattern - Design 3000 Inc http://www.design3000inc.com/factory-method-design-pattern.html      Discussion of OO Pattern: Factory Method Applying the factory method hides the logic used to select and instantiate the appropriate class; this encourages decoupling in several related ways: The various subclasses may be retrieved in different ways: for example, some may be instantiated directly, and others may be retrieved from a remote system. This complexity is encapsulated by the factory method, so that the factory method's client can ignore its intricacies. http://www.cs.unc.edu/~lindsey/courses/comp_204/pattern_discussions/factory_method.html      Object-Oriented Software Development Using Java Source Code TableEntry.java - an interface for the entries to be displayed in the table, target of the adapter pattern SimpleMazeGame.java - a simple implementation of the maze game that does not use creational patterns A design and implementation of the Maze game using Abstract Factory pattern http://se.cs.depaul.edu/Java/chap10.html      Bradshaw and Whelan British - porcelain books, ceramic books, pottery books, marks 464pp., 153 col. and 750 bandw illus.; A new and comprehensive work by Geoffrey Godden which includes valuable new research on the 18th century factories at Isleworth, Limehouse and Vauxhall. The book is well illustrated with examples from the little known Gutman collection. The standard work on identifying factories and designs on blue and white transfer wares. http://www.ceramicbooks.com/british.htm      [No title] The Factory Design Pattern - 123aspx.com ASP.NET Resource Directory http://www.123aspx.com/redir.aspx?res=31346      [No title] 6$ >ª5 ™ó  Ÿ¨Specific Patterns in DetailŸ ¨jThe FACTORY METHOD Pattern The SINGLETON Pattern The PROXY Pattern The FACADE Pattern The OBSERVER Pattern¡k ? ðz Ÿ¨ class Repository { public: virtual Vehicle *Create() ; virtual Void Admit() ; virtual Void Release() ; protected: int findFreeSpace() ; void add(Vehicle*) ; } Vehicle *Repository::Create() { return new Vehicle ; }¡  ªŒ g¦ñà h h ÐÐ88  ðH ð 0 ƒð0 ƒ “ ŽŸ‹” Þ½h¿ ÿ  ? ð ÿÿÿ———̙33ÌÌÌÿ²²²îïï €Ù Ú% ‹ðƒÐð,,4ðð( ð ð4ðò ð4 ãðT€„àف«g ‚Ö³ƒ«g „Ö³‡ ¿ ƒ ¿ À ÿ  ?ðgù 7 ðnŸ¨The Factory Method Pattern¡ ,¦ñà h h ÐÐ88  ðÀ ð4 ãðT€Doځ«g ‚Ö³ƒ«g „Ö³ ¿ ƒ ¿ À ÿ  ?ðB¶5 ð http://www.infj.ulst.ac.uk/~cbcb23/BSc-patterns.ppt

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