c meets design patterns

... composite, we can use the C# generics feature. By declaringIComponent,Component, andCompositeas generic types, we create an mentation of the Composite pattern that can be instantiated in a practical example ... types:Components and Composites of those components Both types agree toconform to an interface of common operations Composite objects consist ofComponents, and in most cases, operations on aCompositeare ... the Composite pattern, we will not create a program, but a namespace containing two classes,Composite and Component , and an interface, IComponent Starting with theIComponentinterface, we declare

Ngày tải lên: 12/08/2014, 09:22

... Mac OS X (or any Mac application) The specification of the AltiVec instruction set A call to an AltiVec instruction The Accelerate framework An Intel processor with an SSE instruction set A Call ... have access to the source of old AltiVec-based code, so they recommended the use of the Accelerate framework The Accelerate framework is a set of high-performance vector-accelerated libraries It ... MyCoolBookbuilds on topofInteractand acts as the adapter class As can be seen inthe Client, MyOpenBook and MySpaceBook have been completely plugged out andreplaced byMyCoolBook We can just change

Ngày tải lên: 12/08/2014, 09:22

... A Factory and Products A Director, Builders, and a Product Product creation invokes CreateProductA Construct(builder) Factory/Builder returns A specific product A part of a product Trang 2Chapter ... policies that can change according to the tier Particular policies applying to each tier (specific Blue, Silver, or Gold tier status rules and benefits) An activity in a particular tier policy ... theStatehas full access to the data intheContext Thus, at any point, either theContextor the activeStatecan decide that particu-it is time to swparticu-itch states This is accomplished by assigning

Ngày tải lên: 12/08/2014, 09:22

... 8-2 C# Feature—Exception Properties C# exceptions are objects that can be created, thrown, and caught Exceptions arecaught in try/catch blocks; different catch clauses can catch different exceptions.Exceptions ... +Execute( ) +Execute( ) Command –State +Execute( ) Receiver Trang 9Client ICommand Command Receiver Invoker ActionUser of the editor, who selects a Cut command on a menu Menu Holder of a Cut ... static class InvokerExtensions { static int count; public static int Count (this Invoker invoker) { abstract class ICommand { public Invoker Execute, Redo, Undo; } // Command 1 class

Ngày tải lên: 12/08/2014, 09:22

... system is its constructor: 1 public Mirror(string spec) { 2 objectStack = new Stack( ); 3 objectStack.Push(null); 4 5 // Register the commands 6 commands = new List<Command>( ); 7 commands.Add(new ... 70.8 which conforms to the original spreadsheet shown in Figure 10-1. The Interpreter method is: public static int [] values; public static int n; public static Context context; public static void ... is a description of CilkChess, a chess program produced at MIT: Cilk jobs may survive machine crashes or network outages despite the fact that Cilk programs have been coded with no special provision

Ngày tải lên: 12/08/2014, 09:22

... to container classes Policy-based classes support flexibility when it comes to conversions If you use policy-by-policy copying, each policy can control which other policies it accepts, or converts ... of the NoChecking and EnforceNotNull policy classes: template <class T> struct NoChecking Trang 27 13{ class NullPointerException : public std::exception { }; static void Check(T* ptr) ... their continuous encouragement and support., Trang 16Chapter 1 Policy-Based Class Design This chapter describes policies and policy classes, important class design techniques that enable the creation

Ngày tải lên: 04/02/2016, 11:13

... Context cA = new Context( new ConcreteStrategyA()); cA.ContextInterface(); Context cB = new Context( new ConcreteStrategyB()); cB.ContextInterface(); Context cC = new Context( ... DongCo { public abstract string type { get; } } DongCoE500Product for DongCo class, ConcreteFactory class for DongCoFactory: class DongCoE500Product : DongCo { string _type = "DCE-500"; ... AbstractProduct classes We called them DongCoFactory and DongCo, these classes are installed in C# as follows: abstract class DongCoFactory { public abstract DongCo getDongCo(); } abstract class

Ngày tải lên: 11/02/2020, 11:49

... preferred because often such visual styles are used to indicate errors within the page In addition, changing colors may not be accessible to screen readers, and people with color defi ciencies may ... users to accomplish tasks Solution Clearly indicate required information on forms so that users can complete a task successfully and reduce the chance of encountering “ missing required information ... them accomplish their goals and tasks Solution When designing, clearly indicate benefi ts of fi lling out and submitting forms This is particularly important when users are creating a new account

Ngày tải lên: 08/11/2013, 03:15

... applications enable one-to-one interaction and store user-specifi c information, they require users to create an account (REGISTRATION) and choose unique credentials to access the web applications ... digi-tized words as CAPTCHA that cannot be read by their OCR (optical character recognition) pro-grams For more information, visit www.recaptcha.net FIGURE 3.13 CAPTCHA on Yahoo!’s registration ... approach, which is collecting information about users using browser cookies as they interact with the appli-cation As Mahemoff (2006) states: As the user interacts with the application, the account

Ngày tải lên: 08/11/2013, 03:15

... functions Control panels are also useful for account overview pages where users can access all of their account-related functions in one place For example, e-commerce applications use account ... Tidwell, 2006), where users can reach the self-contained mini-applications (i.e., “ spokes ” ) from one central “ hub ” page such that users can access a mini-application, accomplish desired tasks, ... How Provide a “ launch ” page from which users can access all application functions or mini-applications Control panels are designed using a hub-and-spoke interface approach (Baxley, 2003; Tidwell,

Ngày tải lên: 15/12/2013, 15:15

... music, etc.), change the default search scope to that category but still allow users to change the scope cat-FIGURE 6.2 Common placement of search areas are (a) top-right corner, (b) in the center ... must go through a specifi c sequence of steps and perform a set of individual tasks in succession (e.g., checkout for e-commerce applications or opening an account with a fi nancial institution) They ... directed, consider the use of PARAMETRIC SEARCH because it allows users to specify search criteria more precisely For expert users, offer a separate ADVANCED SEARCH option and include SEARCH TIPS

Ngày tải lên: 15/12/2013, 15:15

... continuous scrolling Since interac-tions such as comparison and selection become easier with continuous scroll-ing, the approach should not be discounted How Show users search results in a list ... QUERYING (see Chapter 8), which updates search results as users make fi lter-ing choices and affords a richer interactive experience to users Uslter-ing FACETED SEARCH should also be considered as ... search results by selecting a facet essentially makes search criteria more precise, which can be used to search within results to refi ne them With each refi nement to the result set, narrowing facets

Ngày tải lên: 24/12/2013, 20:15

... tabular lists, which can be quite compact, IMAGE LISTS/ GRIDS usually require more space When screen space is limited, consider using the CAROUSEL pattern to accommodate more items (see Chapter 8) ... three location types on the map Include a legend so that users can associate colors and shapes to location types In addition, to not disadvan-tage users with color vision defi ciencies, use colored ... system (GPS) devices, an object’s current position can be overlaid on the map to show its current location This is useful for tracking locations of a fl eet or fi guring out the current location of a

Ngày tải lên: 24/12/2013, 20:15

... Chỉ tiết phức: câu tạo từ những chỉ tiết con (đơn hoặc phức) Trọng lượng = trọng lượng các chỉ tiết con + 10% phụ kiện kết ni Giá thành = giá thành các chỉ tiêt con + 20% công lắp ráp Việt chương ... Khách ở phòng loại A được sử dụng một số dịch vụ của khách sạn Tiên sử dụng dịch vụ được cộng vào tiên thuê phòng của khách Đặc biệt khách sạn có chính sách giảm giá 10% từ ngày thú Việt chương ... tập tin và thư mục - Tập tin có thông tin vê tên và kích thước - Thư mục chỉ có tên nhưng có thê chứa tập tin và thư mục con Việt chương trình cho phép: - Tạo ra một cây thư mục tập tin - Đêm

Ngày tải lên: 12/01/2014, 16:58

... abstract class: class listboxChoice extends multiChoice or class checkBoxChoice extends multiChoice Then we create a simple Factory class that decides which of thesetwo classes to return: class choiceFactory ... we’ll call our Factory aCocoon: When to Use a Factory Pattern You should consider using a Factory pattern when • A class can’t anticipate which kind of class of objects it must create • A class ... find out whether creating an instance was successful or not, since constructors do not return values One way would be to call amethod that checks for the success of creation, and which simply returnssome

Ngày tải lên: 16/01/2014, 20:20

... diamond choices by allowing them to fi lter by price, cut, color, clarity, and carat The range for each choice is selected by users using sliders Trang 14 How Show criteria to users as a set of checkboxes, ... example, offering users a choice for a purchase order or credit card information based on their choice of billing Solution In addition to patterns discussed in Chapter 2, such as FORGIVING FORMAT, ... mass-produced products, many new products can be cus-tomized to users ’ preferences along one or more product attributes For example, when purchasing a car, users may customize its color, trim,

Ngày tải lên: 22/01/2014, 02:20

... classes. Thus, the second major precept suggested by Design Patterns is Favor object composition over inheritance. C# Design Patterns Each of the 23 patterns in Design Patterns is discussed, at least ... inheritance, this is obviously very good advice in the C# context. The other major concept you should recognize is that of object composition. This is simply the construction of objects that contain ... representation of characters in non-Latin languages. It uses a character coding system called Unicode, in which thousands of characters for most major written languages have been defined. You can convert...

Ngày tải lên: 18/10/2013, 17:15

... quyết c c vấn đề trong một lĩnh v c nào đó .C c mẫu đư c lập sưu liệu bằng c ch dùng c c template, c c template cung c p c c heading bên dưới c chứa chi tiết c a mẫu và c ch th c nó làm vi c cho ... c c ch c năng bổ sung cho c c đối tượng riêng biệt một c ch động và trong suốt, nghĩa là không chịu ảnh hưởng (t c động ) c a c c đối tượng kh c. - Cho c c ch c năng mà c c ch c n ăng này c ... giản, c ch th c biểu diễn c u trong ngôn ngữ và c ch th c phiên dịch c c câu đó. Trong ví dụ c thể này, nó miêu tả c ch th c xây dựng c u tr c ngữ pháp cho c c biểu diễn thông thường, c ch thức...

Ngày tải lên: 24/08/2012, 13:53

... bạn c n cung c p c c hành vi cho tất c c c kiểu con. Bình thường, c c Component không c c c thể hiện, c c lớp con ho c c c lớp th c thi c a nó, gọi là c c nốt, c thể c thể hiện và đư c sử ... bằng c c phương th c của mình sẽ th c hiện c c ch c năng abstractionOp() c a lớp Abstraction o Implementation: là giao tiếp th c thi c a lớp c c ch c năng nào đó c a Abstraction o RefineAbstraction: ... định nghĩa ch c năng, yêu c u mà Client c n sử dụng o Adaptee là lớp ch c c c ch c năng mà Target c n sử dụng để tạo ra đư c ch c năng mà Target c n cung c p cho Client o Adapter th c thi từ Target...

Ngày tải lên: 06/09/2012, 14:31

... AbstractFactory (ContinentFactory) o declares an interface for operations that create abstract products • ConcreteFactory (AfricaFactory, AmericaFactory) o implements the operations to create concrete ... Public Function CreateDocument(ByVal docType As DocumentType) _ As IDocument Dim document As IDocument = Nothing Select Case docType Case DocumentType.Word document = New WordDocument() ... to be created by the corresponding concrete factory implements the AbstractProduct interface • Client (AnimalWorld) o uses interfaces declared by AbstractFactory and AbstractProduct classes...

Ngày tải lên: 12/09/2012, 14:38