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import java.lang.annotation.*;
@Retention(RetentionPolicy.RUNTIME) @Inherited @interface Colored { String color(); }
public class AtThis5 {
public static void main(String[]argv) {
new A().start(new B());
new B().start(new C());
new C().start(new A());
X.verify();
}
}
@Colored(color="yellow")
class A {
public void start(A a) { a.m();} // Can't match @this() on calls from static method,
// hence this start() method...
public void m() { System.err.println("method"); }
}
class B extends A { } // inherits yellow color :)
@Colored(color="blue") class C extends B { }
aspect X {
static int count = 0;
before(Colored cThis,Colored cTarg):
call(* m(..)) && !within(X) && @this(cThis) && @target(cTarg) {
count++;
if (count == 1 &&
!(cThis.color().equals("yellow") && cTarg.color().equals("yellow")))
throw new RuntimeException("1st run, colors should be yellow:yellow but are "+
cThis.color()+":"+cTarg.color());
if (count == 2 &&
!(cThis.color().equals("yellow") && cTarg.color().equals("blue")))
throw new RuntimeException("2nd run, colors should be yellow:blue but are "+
cThis.color()+":"+cTarg.color());
if (count == 3 &&
!(cThis.color().equals("blue") && cTarg.color().equals("yellow")))
throw new RuntimeException("3rd run, colors should be blue:yellow but are "+
cThis.color()+":"+cTarg.color());
if (count > 3)
throw new RuntimeException("Advice should only run three times");
}
public static void verify() {
if (count!=3) throw new Error("Should be 3 runs: "+count);
}
}
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