/**
* Transform a wavelet delta if it has been submitted against a different head (currentVersion).
* Must be called with write lock held.
*
* @param delta to possibly transform
* @param appliedVersion that the delta is applied to
* @return the transformed delta and the version it was applied at (the version is the current
* version of the wavelet, unless the delta is a duplicate in which case it is the version at
* which it was originally applied)
* @throws InvalidHashException if submitting against same version but different hash
* @throws OperationException if transformation fails
*/
protected VersionedWaveletDelta maybeTransformSubmittedDelta(
WaveletDelta delta, HashedVersion appliedVersion)
throws InvalidHashException, OperationException {
if (appliedVersion.equals(currentVersion)) {
// Applied version is the same, we're submitting against head, don't need to do OT
return new VersionedWaveletDelta(delta, appliedVersion);
} else {
// Not submitting against head, we need to do OT, but check the versions really are different
if (appliedVersion.getVersion() == currentVersion.getVersion()) {
LOG.warning(
"Same version ("
+ currentVersion.getVersion()
+ ") but different hashes ("
+ appliedVersion
+ "/"
+ currentVersion
+ ")");
throw new InvalidHashException(
"Different hash, same version: " + currentVersion.getVersion());
} else {
return transformSubmittedDelta(delta, appliedVersion);
}
}
}
