private List<OIdentifiable> cursorToList(OIndexCursor cursor) {
final List<OIdentifiable> currentResult = new ArrayList<OIdentifiable>();
Map.Entry<Object, OIdentifiable> entry = cursor.nextEntry();
while (entry != null) {
currentResult.add(entry.getValue());
entry = cursor.nextEntry();
}
return currentResult;
}
@Override
public String getName() {
final StringBuilder res = new StringBuilder("IndexChain{");
final List<String> indexNames = getIndexNames();
for (int i = 0; i < indexNames.size(); i++) {
String indexName = indexNames.get(i);
if (i > 0) res.append(", ");
res.append(indexName);
}
res.append("}");
return res.toString();
}
private List<OIdentifiable> applyFirstIndex(Collection<Comparable> currentKeys) {
final List<OIdentifiable> result;
if (isComposite(firstIndex)) {
result = new ArrayList<OIdentifiable>();
for (Comparable key : currentKeys) {
result.addAll(getFromCompositeIndex(key, firstIndex));
}
} else {
final OIndexCursor cursor = firstIndex.iterateEntries(currentKeys, true);
result = cursorToList(cursor);
}
updateStatistic(firstIndex);
return result;
}
@Override
public Map.Entry<Object, OIdentifiable> nextEntry() {
if (currentIterator == null) return null;
while (!currentIterator.hasNext()) {
final Map.Entry<Object, OIdentifiable> entry = internalCursor.nextEntry();
if (entry == null) {
currentIterator = null;
return null;
}
queryResult.clear();
queryResult.addAll(applyTailIndexes(entry.getValue()));
currentIterator = queryResult.iterator();
}
if (!currentIterator.hasNext()) {
currentIterator = null;
return null;
}
final OIdentifiable result = currentIterator.next();
return new Map.Entry<Object, OIdentifiable>() {
@Override
public Object getKey() {
throw new UnsupportedOperationException("getKey");
}
@Override
public OIdentifiable getValue() {
return result;
}
@Override
public OIdentifiable setValue(OIdentifiable value) {
throw new UnsupportedOperationException("setValue");
}
};
}