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Topic: State pattern


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In the News (Fri 27 Nov 09)

  
 [No title]   (Site not responding. Last check: 2007-10-08)
Objects are often discussed in terms of having a "state" that describes their exact conditions in a given time, based upon the values of their properties.
One Design Pattern that is used very often in conjunction with the State Pattern is the Null Pattern.
Since the states are separate objects from the context, all the properties of the context need to have accessor methods that are at least package visible.
exciton.cs.rice.edu /JavaResources/DesignPatterns/StatePat.htm   (411 words)

  
 State
A monolithic object's behavior is a function of its state, and it must change its behavior at run-time depending on that state.
Or, an application is characterixed by large and numerous case statements that vector flow of control based on the state of the application.
The two patterns use the same structure to solve different problems: State allows an object's behavior to change along with its state, while Bridge's intent is to decouple an abstraction from its implementation so that the two can vary independently.
home.earthlink.net /~huston2/dp/state.html   (484 words)

  
 Design Pattern Summary: State   (Site not responding. Last check: 2007-10-08)
The State pattern is a behavioral pattern, and as part of behavioral patterns it uses object composition rather than inheritance.
The usage of this pattern is applicable when behavior of an object is dependant on its state and the behavior is changed at run-time dependant on the state.
The State pattern delegates the handling of the state behavior to the state classes thereby reducing the objects responsibilities and the Blob effect.
pages.cpsc.ucalgary.ca /~phong/courses/SENG609.04/State.htm   (388 words)

  
 PHMC: Pennsylvania History   (Site not responding. Last check: 2007-10-08)
The State Seal of Pennsylvania does not use the term, but it is a traditional, official designation used in referring to the state, and legal processes are in the name of the Commonwealth.
In 1776, our first state constitution referred to Pennsylvania as both "Commonwealth" and "State," a pattern of usage that was perpetuated in the constitutions of 1790, 1838, 1874, and 1968.
The State Seal is in the custody of the Secretary of the Commonwealth.
www.phmc.state.pa.us /bah/pahist/symbols.asp?secid=31   (1268 words)

  
 GoF Design Pattern::Behavioral::State   (Site not responding. Last check: 2007-10-08)
State defines an interface for encapsulating the behavior associated with a particular state of the Context.
The state pattern is useful when the design requires the object’s behavior to be changed at run-time that depends on the object’s state.
Depending on the frequency of occurrence of state changes, state object can either be created statically or dynamically in run-time.
pages.cpsc.ucalgary.ca /~chi/SENG/609_04/StateSummary.html   (460 words)

  
 [No title]
This pattern is known to be used in many applications including applications needing multiple linebreaking algorithms, the definition of register allocation schemes in a compiler, and in dialog boxes for a GUI component classes.
This pattern is applicable when an object's behavior depends on its state, which changes at run-time, or when operations have large, multipartconditional statements that depend on the object's state, which is usually represented by enumerated constants.
This pattern is applicable when the exact handler for a request is selected dynamically from a group of potential handlers, when a request is desired to be sent to one of a group of objects without explicitly specifying the receiver, and when the set of request handling objects should be dynamically specified.
sern.ucalgary.ca /courses/SENG/609.04/W98/jonesb/summaries.html   (2292 words)

  
 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.
www.kids.net.au /encyclopedia-wiki/de/Design_pattern_(computer_science)   (403 words)

  
 MoreRead.com - Applying the State Pattern to WebSphere Portal V5 Portlets: Part 1. Overview - 2005-03-01
Applying the state pattern results in a cleaner implementation, and, as you move between portlet modes, the state is always remembered.
With this pattern, you can easily determine where and when you want data to be retrieved from the source, and when it should be retrieved from cache.
A state is a class that implements the state interface and represents the effect of the portlet as a result of applying an action.
www.moreread.com /it/archives/2005/03/01/10319.shtml   (2941 words)

  
 Using the STATE Design Pattern in Java   (Site not responding. Last check: 2007-10-08)
Use the STATE pattern to simplify your code by distributing an operation across a collection of classes that represent an object's various states.
The state of an object is a combination of the current values of its attributes.
The intent of the STATE pattern is to distribute state-specific logic across classes that represent an object's state.
www.informit.com /articles/article.asp?p=28677&seqNum=3   (812 words)

  
 Design Pattern Synopses   (Site not responding. Last check: 2007-10-08)
The Filter pattern is a special case of the Decorator pattern, where a data source or data sink object is wrapped to add logic to the handling of a data stream.
The Composite pattern also allows the objects in the tree to be manipulated in a consistent manner, by requiring all of the objects in the tree to have a common superclass or interface.
The Flyweight pattern is often combined with the Composite pattern to represent the leaf nodes of a hierarchical structure with shared objects.
www.mindspring.com /~mgrand/pattern_synopses.htm   (4381 words)

  
 Software Design Pattern
The pattern is also given a name, which serves as a conceptual handle, to facilitate discussing the pattern and the jewel of information it represents.
"A pattern is a named nugget of instructive information that captures the essential structure and insight of a successful family of proven solutions to a recurring problem that arises within a certain context and system of forces." All of us are using one or other pattern with or without knowledge.
This is the summary to the GOF Patterns.
www.ciol.com /content/technology/sw_desg_patt   (817 words)

  
 Ryan O'Connell's Blog: Implementing the State Design Pattern using Enums
Typically, the state pattern is used to model a state transition graph allowing an object to modify its behavior as the state of the graph changes.
From my point of view realizing a controlling state machine in just one class to use it as the center knot that references to the specialized classes on a fairly high level of the class tree is a very elegant solution.
Add a third state to your example, when a switch is turned on, it is first in a warming state before it actually turns on.
weblogs.java.net /blog/ryano/archive/2005/01/implementing_th_1.html   (1374 words)

  
 Parallel Wait State Design Pattern
This is faster in comparison to Serial Wait State pattern where one message is sent to initiate an activity on an entity, its response is awaited and only on receipt of the response same activity is initiated on the next entity.
The main objective of this design pattern is to efficiently handle scenarios where sending of similar message to multiple entities to initiate similar activity in parallel is involved.
The state machine implementing the parallel state pattern collaborates with the tasks on the entities where some desired operation needs to be performed.
www.eventhelix.com /RealtimeMantra/PatternCatalog/ParallelWaitStatePattern.htm   (867 words)

  
 Imitation is the Highest Form
The State Pattern is classified as a behavior pattern because it addresses a class of problem that has to do with the behavior of classes.
Generally, the state pattern permits you to sub-divide the internal behavior of an object based on that object's current state.
In the case of the State Pattern what we have accomplished is a simplification of the interactions by reducing the dependency on conditional logic and flags.
www.devsource.com /article2/0,1759,1617496,00.asp   (1614 words)

  
 GNU Go Documentation: DFA
Its states are the couples (l,r) where l is a state of L and r is a state of R.
The state (0,0) is the error state of B and the state (1,1) is its initial state.
It is possible to construct a special pattern database that generates an "explosive" automaton: the size of the DFA is in the worst case exponential in the number of patterns it recognizes.
www.gnu.org /software/gnugo/gnugo_10.html   (1483 words)

  
 State Oriented Programming
Generic "state machine interpreters" driven by typically complex data structures that represent the hierarchy of states together with entry/exit actions and transitions.
States are represented as instances of the State class, but unlike the "State" pattern as described by Gamma et al.7, the State class is not intended for subclassing but rather for inclusion as is. Accordingly, our approach requires state machines to be constructed by composition rather than by inheritance.
The state machine engine can easily be instrumented (an example is available in code accompanying this article at http://www.embedded.com/code/2000code.htm) to produce execution trace, message sequence charts, or even animated state diagrams.
www.embedded.com /2000/0008/0008feat1.htm   (4043 words)

  
 Collector State Pattern and Digit Collection
The key participants in this pattern are the task sending the sequence of small messages and the task collecting the message sequence to assemble a bigger message or meaningful data.
The state machine implementing the collector state patterns collaborates with the source of messages being collected and in some scenarios might report completion of collection to the originator.
Feature Design Patterns like parallel and serial coordination are examples of other more general mechanisms of handling a sequence of messages.
www.eventhelix.com /RealtimeMantra/PatternCatalog/CollectorStatePattern.htm   (523 words)

  
 State pattern - Wikipedia, the free encyclopedia
A behavioral software design pattern, state pattern is used in computer programming to represent the state of an object.
This is a clean way for an object to partially change its type at runtime.
The state of the drawing tool is thus represented entirely by the class making it easy to add more tools and to keep their behavior localized to that subclass of
en.wikipedia.org /wiki/State_pattern   (222 words)

  
 Solid State Technology - Pattern transfer into low dielectic materials by high-density plasma etching
It is based on repeated pattern transfers into the dielectric to produce the required trench and via structures prior to metal deposition and CMP steps [1, 2] (Fig.
The patterning of the dielectric layers by plasma etching techniques is essential to the damascene approach.
For pattern transfer, the most important difference between the materials shown in Table 1 is the classification into inorganic and organic materials.
sst.pennnet.com /Articles/Article_Display.cfm?Article_ID=73170   (3094 words)

  
 Manage VB6 Code Complexity with the State Behavior Pattern
Patterns and anti-patterns are a body of work that can play the role of master.
However, the number of pattern practitioners is increasing, and several excellent references on patterns are available today.
This article discusses a pattern that is both easy to implement and easy to use in Visual Basic 6, the State pattern.
www.devx.com /vb/Article/22082/1763/page/1   (549 words)

  
 SENG 609.04
State pattern may be used when an object must change its behavior at run-time depending on which state it is in or operations have large multipart conditional statements that depends on the object's state.
State - defines an interface for encapsulating the behavior associated with a particular state of the Context
This pattern is used in the HotDraw and Unidraw drawing edit frameworks.
www.ucalgary.ca /~samulee/seng60904/state.html   (231 words)

  
 State Pattern   (Site not responding. Last check: 2007-10-08)
State Pattern allows an object to alter its behavior when its internal state changes.
The key idea is to introduce an abstract class whose subclasses represent the possible internal states, and have the object delegate to an instance of one of these subclasses where appropriate.
This state is usually represented by one or more enumerated constants.
www.instantiations.com /codepro/ws/docs/features/patterns/state_pattern.html   (305 words)

  
 How to implement state-dependent behavior
It describes how to implement the State pattern in Java, and indicates how a State object can be used as a component in a containing class.
The State pattern, described in the book Design Patterns, by Gamma, Helm, Johnson, and Vlissides, Addison-Wesley, 1995 (see Resources for further book information), is an example of a tremendously useful software pattern that takes advantage of polymorphism.
The State pattern is useful when you have an object that can be in one of several states, with somewhat different behavior in each state.
www.javaworld.com /javaworld/jw-08-1997/jw-08-stated.html   (1107 words)

  
 State Design Pattern in C# and VB.NET
code demonstrates the State pattern which allows an object to behave differently depending on its internal state.
The difference in behavior is delegated to objects that represent this state.
The difference in behavior is delegated to State objects called RedState, SilverState and GoldState.
www.dofactory.com /Patterns/PatternState.aspx   (207 words)

  
 Description of Application State Sharer Pattern
The State Sharer might then request additional information from the user through the user interface (dialog boxes in Mosaic), before directing the final formatted information on to specific modules for actual communication of the information to the recipients.
This pattern is used with the Hotlist function in order to allow users to email their hotlists to friends and coworkers.
This type of pattern supporting sharing of application state information is prevalent in applications such as WWW browsers and newsreaders.
www.cc.gatech.edu /classes/cs8113d_96_winter/project/pattern3.html   (1244 words)

  
 Free & Premium Books, Manuals, E-Books, Courses and CDs with Silvia Hartmann & Friends
Evil CD Pattern - Refers to thought fields and other ereas which have become "stuck" inside someone's energy body, and once they're inside, it seems as though they are self generated and belong there, causing inordinate chaos.
Sanctuary State - A particular range of totality states where all of the self is present - energy mind, energy body, physicality and consciousness.
There are time zoom movements, conceptual ones (see the Melville Pattern), contextual zoom movements and all improve the ability "to flexibly chunk up and down and across" various levels and layers, plus to acquire the necessary "bigger pictures" or "finer details" as and when required.
www.starfields.org /meta-index.htm   (4650 words)

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