/**
* Return a stem with matching display extension, or null if that stem doesn't exist
*
* @return
*/
public static StemI findChildStem(StemI parentStem, String displayExtension) {
Set<StemI> existingStems = parentStem.getChildStems();
for (StemI stem : existingStems) {
if (stem.getDisplayExtension().equals(displayExtension)) {
return stem;
}
}
return null;
}
