Running the Advanced Contexts and Dependency Injection Examples - The Java EE 6 Tutorial: Advanced Topics - page 301

Click here to view code image
@Decorator
public abstract class CoderDecorator implements Coder {
@Inject
@Delegate
@Any
Coder coder;
@Override
public String codeString(String s, int tval) {
int len = s.length();
return "\"" + s + "\" becomes " + "\"" + coder.codeString(s,
tval)
+ "\", " + len + " characters in length";
}
}
The decorator's codeString method calls the delegate object's codeString method
to perform the actual encoding.
The decorators example includes the Logged interceptor binding and LoggedIn-
terceptor class from the billpayment example. For this example, the interceptor is
set on the CoderBean.encodeString method and the CoderImpl.codeString
method. The interceptor code is unchanged; interceptors are usually reusable for different
applications.
Except for the interceptor annotations, the CoderBean and CoderImpl classes are
identical to the versions in the encoder example.
The beans.xml file specifies both the decorator and the interceptor:
Click here to view code image
<decorators>
<class>decorators.CoderDecorator</class>
</decorators>
<interceptors>
<class>decorators.LoggedInterceptor</class>
</interceptors>
Running the decorators Example
You can use either NetBeans IDE or Ant to build, package, deploy, and run the decor-
ators application.