Basic technologies (such as XML, SOAP, WSDL) provide means to describe, locate, and invoke services as an entity in its own right. However, these technologies do not give a rich behavioral detail about the role of the service in more complex collaboration. This collaboration includes a sequence of activities and relationships between activities, which build … Read more
Subclass Factory Mixins There is another way to realize mixins in Javascript: With subclass factories. A subclass factory is a function that excepts a base class and returns an extended subclass of this base class: const mixin = base => class extends base { /* properties to mix in */ } Subclass factories are possible … Read more
[note: This question was originally tagged as being language-agnostic. Based on that, this answer was written to be fairly language agnostic, so it discusses inheritance as it’s used across a wide range of languages, such as Smalltalk, C++, and Object Pascal. It’s since been re-tagged as being specifically about Java. Java is different in defining … Read more
Composition refers to combining simple types to make more complex ones. In your example, composition could be: Animal: Skin animalSkin Organs animalOrgans Mammal::Animal: Hair/fur mammalFur warm-blooded-based_cirulation_system heartAndStuff Person::Mammal: string firstName string lastName If you wanted to go totally composition (and get rid of all inheritance) it would look like this: Animal: Skin animalSkin Organs animalOrgans … Read more
Depending on the purpose of the <ui:include> template, you’ve several options: Use <f:subview>. It creates another NamingContainer context (like as <h:form>, <h:dataTable>, and friends all do): <f:subview id=”top”> <ui:include src=”https://stackoverflow.com/WEB-INF/includes/some.xhtml” /> </f:subview> … <f:subview id=”bottom”> <ui:include src=”https://stackoverflow.com/WEB-INF/includes/some.xhtml” /> </f:subview> The components definied in some.xhtml will end up getting respectively top: and bottom: prefix in their … Read more
The easiest approach would be first to write a composition of 2 functions: def compose2(f, g): return lambda *a, **kw: f(g(*a, **kw)) And then use reduce to compose more functions: import functools def compose(*fs): return functools.reduce(compose2, fs) Or you can use some library, which already contains compose function.
Composition final class Car { private final Engine engine; Car(EngineSpecs specs) { engine = new Engine(specs); } void move() { engine.work(); } } Aggregation final class Car { private Engine engine; void setEngine(Engine engine) { this.engine = engine; } void move() { if (engine != null) engine.work(); } } In the case of composition, the … Read more
Consider this monad which is isomorphic to the (Bool ->) monad: data Pair a = P a a instance Functor Pair where fmap f (P x y) = P (f x) (f y) instance Monad Pair where return x = P x x P a b >>= f = P x y where P x … Read more
Foo f1; Foo f2(f1); Yes this will do what you expect it to: The f2 copy constructor Foo::Foo(Foo const&) is called. This copy constructs its base class and then each member (recursively) If you define a class like this: class X: public Y { private: int m_a; char* m_b; Z m_c; }; The following methods … Read more
Technically, it doesn’t matter where you declare the <f:metadata> in the view as long as it’s in the top level view (so, when using templating, in the template client and thus not in the master template). When the view get built, the metadata is basically not part of the JSF component tree, but of the … Read more