protected void init(Instances structure) {
List<SortRule> sortRules = new ArrayList<SortRule>();
if (m_sortDetails != null && m_sortDetails.length() > 0) {
String[] sortParts = m_sortDetails.split("@@sort-rule@@");
for (String s : sortParts) {
SortRule r = new SortRule(s.trim());
r.init(m_env, structure);
sortRules.add(r);
}
m_sortComparator = new SortComparator(sortRules);
}
// check for string attributes
m_stringAttIndexes = new HashMap<String, Integer>();
for (int i = 0; i < structure.numAttributes(); i++) {
if (structure.attribute(i).isString()) {
m_stringAttIndexes.put(structure.attribute(i).name(), new Integer(i));
}
}
if (m_stringAttIndexes.size() == 0) {
m_stringAttIndexes = null;
}
}
@Override
public int compare(InstanceHolder o1, InstanceHolder o2) {
int cmp = 0;
for (SortRule sr : m_sortRules) {
cmp = sr.compare(o1, o2);
if (cmp != 0) {
return cmp;
}
}
return 0;
}