コード例 #1
0
  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);
    }
  }
コード例 #2
0
 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());
 }