Package org.apache.ws.jaxme.js.pattern
The pattern package
This package contains a set of design patterns implemented with
the JaxMe JavaSource generator framework.
The pattern package
This package contains a set of design patterns implemented with
the JaxMe JavaSource generator framework. It is provided both for
demonstration and actual use. Each pattern is accompanied with a
corresponding Ant task that allows to invoke the respective generator
from within an Ant build script. The patterns are:
Design pattern(s) | Class | Ant task | Description |
---|
Proxy objects Multiple inheritance | ProxyGenerator | proxyGenerator | Proxy are instances that delegate most or all method calls to another
object. Proxy objects in Java are typically created by the class
java.lang.reflect.Proxy . Compared to this class, the generator
has the advantage, that it is much easier to adapt the proxy object
to your own needs: In our case you simple subclass the generated
Proxy class.
Proxy objects can also be used to implement something like multiple
inheritance. This is demonstrated in the Unit test
MultipleInheritanceTest ,
where a subclass of java.util.Observable is created,
that is also an instance of java.util.List by inheriting
from java.util.ArrayList . |
Typesafe enumerations | TypesafeEnumerationGenerator | enumGenerator | A typesafe enumeration is a Java class that guarantees that only a
specified set of instances can exist. These instances are part of the
class and accessible through public, static, final fields. |
Proxy chains | ChainGenerator | chainGenerator | A proxy chain can be viewed as a set of event handlers implementing
a common interface. The interface methods are the events being processed.
Each element in the chain can decide to process an event alone (by
returning immediately), to delegate the event to the next element
in the chain (by calling the interface method in its superclass)
or to post process the result of the delegated event. |