@Override
public void deleteDocument(String docId, String prevRevId) throws ConflictException {
Preconditions.checkState(this.isOpen(), "Database is closed");
Preconditions.checkArgument(
!Strings.isNullOrEmpty(docId), "Input document id can not be empty");
Preconditions.checkArgument(
!Strings.isNullOrEmpty(prevRevId), "Input previous revision id can not be empty");
CouchUtils.validateRevisionId(prevRevId);
DocumentDeleted documentDeleted = null;
this.sqlDb.beginTransaction();
try {
BasicDocumentRevision preRevision = this.getDocument(docId, prevRevId);
if (preRevision == null) {
throw new IllegalArgumentException("The document trying to update does not exist.");
}
DocumentRevisionTree revisionTree = this.getAllRevisionsOfDocument(docId);
if (revisionTree == null) {
throw new IllegalArgumentException("Document does not exist for id: " + docId);
} else if (!revisionTree.leafRevisionIds().contains(prevRevId)) {
throw new ConflictException("Revision to be deleted is not a leaf node:" + prevRevId);
}
if (!preRevision.isDeleted()) {
this.checkOffPreviousWinnerRevisionStatus(preRevision);
String newRevisionId = CouchUtils.generateNextRevisionId(preRevision.getRevision());
// Previous revision to be deleted could be winner revision ("current" == true),
// or a non-winner leaf revision ("current" == false), the new inserted
// revision must have the same flag as it previous revision.
// Deletion of non-winner leaf revision is mainly used when resolving
// conflicts.
this.insertRevision(
preRevision.getInternalNumericId(),
newRevisionId,
preRevision.getSequence(),
true,
preRevision.isCurrent(),
JSONUtils.EMPTY_JSON,
false);
BasicDocumentRevision newRevision = this.getDocument(preRevision.getId(), newRevisionId);
documentDeleted = new DocumentDeleted(preRevision, newRevision);
}
// Very tricky! Must call setTransactionSuccessful() even no change
// to the db within this method. This is to allow this method to be
// nested to other outer transaction, otherwise, the outer transaction
// will rollback.
this.sqlDb.setTransactionSuccessful();
} finally {
this.sqlDb.endTransaction();
if (documentDeleted != null) {
eventBus.post(documentDeleted);
}
}
}
private String insertNewWinnerRevision(DocumentBody newWinner, DocumentRevision oldWinner) {
String newRevisionId = CouchUtils.generateNextRevisionId(oldWinner.getRevision());
this.insertRevision(
oldWinner.getInternalNumericId(),
newRevisionId,
oldWinner.getSequence(),
false,
true,
newWinner.asBytes(),
true);
return newRevisionId;
}