techno.blog("Dion")

Adrian has been talking about getting Java 5 support into AspectJ. I can imagine how much work that has been, and I am impressed to hear that AspectJ 5 now supports full source compilation of Java 5 programs.

AJDT also has integrated in to Eclipse 3.1 M4 with full Java 5 support, eager parsing, and early error indications all working happily (not officially released).

Check out a SimpleAspect. Java 5 style:

import java.util.List;

@MyAnnotation
public aspect SimpleAspect {

int x;
static List myStringList;

public static void main(String[] args) {
for(String s:args) {
System.out.println(s);
myStringList.add(s);
}
C c = new C();
c.whatCsDoBest();
c.somethingElse();
c.myInt(5);
c.somethingElse(new Object(), new Object());
c.whoAmI();
D d = new D();
d.whoAmI();
}

pointcut annotatedExecution() :
execution(@MyAnnotation * *(..));

before() : annotatedExecution() {
System.out.println(thisJoinPoint + " has an annotation.");
}

before() : call(* myInt(..)) && args(int) {
System.out.println("Autoboxing match");
}

before(Object[] objects) : call(* somethingElse(Object...)) && args(objects) {
System.out.print("Varargs match: ");
for (Object o:objects) {
System.out.print(o + " ");
}
System.out.println();
}

before() : execution(C whoAmI()) {
System.out.println("Covariant match on execution(C whoAmI())");
}

before() : execution(D whoAmI()) {
System.out.println("Covariant match on execution(D whoAmI())");
}
}

class C {

@MyAnnotation
public void whatCsDoBest() {

}

public void somethingElse(Object... objects) {

}

public C whoAmI() {
return this;
}

Progress getAspectJ5Progress() {
return Progress.EXCELLENT;
}

public int myInt(Integer i) {
return i;
}

}

class D extends C {
public D whoAmI() {
return this;
}
}

@interface MyAnnotation {}

enum Progress { OK, GOOD, VERYGOOD, EXCELLENT }