public Object proceed(Object[] adviceBindings) throws Throwable {
// when called from a before advice, but be a no-op
if (arc == null) return null;
else {
// Based on the bit flags in the AroundClosure we can determine what to
// expect in the adviceBindings array. We may or may not be expecting
// the first value to be a new this or a new target... (see pr126167)
int flags = arc.getFlags();
boolean unset = (flags & 0x100000) != 0;
boolean thisTargetTheSame = (flags & 0x010000) != 0;
boolean hasThis = (flags & 0x001000) != 0;
boolean bindsThis = (flags & 0x000100) != 0;
boolean hasTarget = (flags & 0x000010) != 0;
boolean bindsTarget = (flags & 0x000001) != 0;
// state is always consistent with caller?,callee?,formals...,jp
Object[] state = arc.getState();
// these next two numbers can differ because some join points have a this and
// target that are the same (eg. call) - and yet you can bind this and target
// separately.
// In the state array, [0] may be this, [1] may be target
int firstArgumentIndexIntoAdviceBindings = 0;
int firstArgumentIndexIntoState = 0;
firstArgumentIndexIntoState += (hasThis ? 1 : 0);
firstArgumentIndexIntoState += (hasTarget && !thisTargetTheSame ? 1 : 0);
if (hasThis) {
if (bindsThis) {
// replace [0] (this)
firstArgumentIndexIntoAdviceBindings = 1;
state[0] = adviceBindings[0];
} else {
// leave state[0] alone, its OK
}
}
if (hasTarget) {
if (bindsTarget) {
if (thisTargetTheSame) {
// this and target are the same so replace state[0]
firstArgumentIndexIntoAdviceBindings = 1 + (bindsThis ? 1 : 0);
state[0] = adviceBindings[(bindsThis ? 1 : 0)];
} else {
// need to replace the target, and it is different to this, whether
// that means replacing state[0] or state[1] depends on whether
// the join point has a this
firstArgumentIndexIntoAdviceBindings = (hasThis ? 1 : 0) + 1;
state[hasThis ? 1 : 0] = adviceBindings[hasThis ? 1 : 0];
}
} else {
// leave state[0]/state[1] alone, they are OK
}
}
// copy the rest across
for (int i = firstArgumentIndexIntoAdviceBindings; i < adviceBindings.length; i++) {
state[firstArgumentIndexIntoState + (i - firstArgumentIndexIntoAdviceBindings)] =
adviceBindings[i];
}
// old code that did this, didnt allow this/target overriding
// for (int i = state.length-2; i >= 0; i--) {
// int formalIndex = (adviceBindings.length - 1) - (state.length-2) + i;
// if (formalIndex >= 0 && formalIndex < adviceBindings.length) {
// state[i] = adviceBindings[formalIndex];
// }
// }
return arc.run(state);
}
}
public Object proceed() throws Throwable {
// when called from a before advice, but be a no-op
if (arc == null) return null;
else return arc.run(arc.getState());
}