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import java.io.*;
abstract aspect ExceptionHandling<T extends Throwable> {
protected abstract void onException(T anException);
protected abstract pointcut inExceptionHandlingScope();
declare soft: T : inExceptionHandlingScope();
after() throwing (T anException) : inExceptionHandlingScope() {
onException(anException);
}
}
public aspect DeclareSoftWithTypeVars extends ExceptionHandling<IOException>{
protected pointcut inExceptionHandlingScope() :
call(* doIO*(..));
protected void onException(IOException ex) {
System.err.println("handled exception: " + ex.getMessage());
throw new MyDomainException(ex);
}
public static void main(String[] args) {
C c = new C();
try {
c.doIO();
} catch (MyDomainException ex) {
System.err.println("Successfully converted to domain exception");
}
}
}
class C {
public void doIO() throws IOException {
throw new IOException("io, io, it's off to work we go...");
}
}
class MyDomainException extends RuntimeException {
public MyDomainException(Throwable t) {
super(t);
}
}
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