}
final Optional<TreeNode> newRoot = m.getStrategy().apply(m.getRootModification(),
Optional.of(currentRoot), m.getVersion());
Preconditions.checkState(newRoot.isPresent(), "Apply strategy failed to produce root node for modification %s", modification);
}
final Optional<TreeNode> newRoot = m.getStrategy().apply(m.getRootModification(),
Optional.of(currentRoot), m.getVersion());
Preconditions.checkState(newRoot.isPresent(), "Apply strategy failed to produce root node for modification %s", modification);