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/*
* Copyright (c) 1998-2002 PARC Inc. All rights reserved.
*
* Use and copying of this software and preparation of derivative works based
* upon this software are permitted. Any distribution of this software or
* derivative works must comply with all applicable United States export
* control laws.
*
* This software is made available AS IS, and PARC Inc. makes no
* warranty about the software, its performance or its conformity to any
* specification.
*/
import java.util.*;
import java.awt.Point;
import org.aspectj.lang.JoinPoint;
public class RunTime {
public static void main(String[] a) {
AnotherPoint.create();
SubPoint.create();
}
}
/** @author Wes Isberg */
aspect FactoryValidation {
// START-SAMPLE declares-inoculated-prohibitNonprivateConstructors Error to have accessible sub-Point constructors
/** We make it an error for any Point subclasses to have non-private constructors */
declare error : execution(!private Point+.new(..))
&& !within(java*..*) :
"non-private Point subclass constructor";
// END-SAMPLE declares-inoculated-prohibitNonprivateConstructors
// article page 41 - runtime NPE
// START-SAMPLE testing-inoculated-runtimeErrorWhenNullReturnedFromFactory Throw Error when factory returns null
/** Throw Error if a factory method for creating a Point returns null */
after () returning (Point p) :
call(Point+ SubPoint+.create(..)) {
if (null == p) {
String err = "Null Point constructed when this ("
+ thisJoinPoint.getThis()
+ ") called target ("
+ thisJoinPoint.getTarget()
+ ") at join point ("
+ thisJoinPoint.getSignature()
+ ") from source location ("
+ thisJoinPoint.getSourceLocation()
+ ") with args ("
+ Arrays.asList(thisJoinPoint.getArgs())
+ ")";
throw new Error(err);
}
}
// END-SAMPLE testing-inoculated-runtimeErrorWhenNullReturnedFromFactory
}
class SubPoint extends Point {
public static SubPoint create() { return null; } // will cause Error
private SubPoint(){}
}
class AnotherPoint extends Point {
public static Point create() { return new Point(); }
// to see that default constructor is picked out by declare error
// comment out this constructor
private AnotherPoint(){}
}
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