/**
* Get the result of the rewrite.
*
* @return the resulting operator
*/
public Op getResult() {
if (result.size() == 0) {
return OpNull.create();
}
if (result.size() == 1) {
return result.get(0);
}
return result;
}
/** Rewrite sequence elements */
@Override
public void visit(final OpSequence opSequence) {
if (LOG.isDebugEnabled()) {
LOG.debug("Starting visiting OpSequence");
}
addOp(rewriteOpN(opSequence, OpSequence.create()));
}
private static Op flush(BasicPattern pattern, Op op) {
if (pattern == null || pattern.isEmpty()) {
if (op == null) return OpTable.unit();
return op;
}
OpBGP opBGP = new OpBGP(pattern);
return OpSequence.create(op, opBGP);
}
/**
* Add the operation to the result.
*
* @param op the operation to add.
*/
private void addOp(final Op op) {
result.add(op);
}
/**
* Reset the rewriter to the initial state.
*
* @return this rewriter for chaining.
*/
public OpRewriter reset() {
result = OpSequence.create();
return this;
}