/**
* This method is used when the TransposePathElement is used on the LFH as data.
*
* <p>Aka, normal "evaluate" returns either a Number or a String.
*
* @param walkedPath WalkedPath to evaluate against
* @return The data specified by this TransposePathElement.
*/
public Optional<Object> objectEvaluate(WalkedPath walkedPath) {
// Grap the data we need from however far up the tree we are supposed to go
PathStep pathStep = walkedPath.elementFromEnd(upLevel);
if (pathStep == null) {
return Optional.empty();
}
Object treeRef = pathStep.getTreeRef();
// Now walk down from that level using the subPathReader
if (subPathReader == null) {
return Optional.of(treeRef);
} else {
return subPathReader.read(treeRef, walkedPath);
}
}
public MatchedElement match(String dataKey, WalkedPath walkedPath) {
return walkedPath
.lastElement()
.getMatchedElement(); // copy what our parent was so that write keys of &0 and &1 both work.
}