private static Collection<OIndex<?>> prepareLastIndexVariants(
OClass iSchemaClass, OSQLFilterItemField.FieldChain fieldChain) {
OClass oClass = iSchemaClass;
final Collection<OIndex<?>> result = new ArrayList<OIndex<?>>();
for (int i = 0; i < fieldChain.getItemCount() - 1; i++) {
oClass = oClass.getProperty(fieldChain.getItemName(i)).getLinkedClass();
if (oClass == null) {
return result;
}
}
final Set<OIndex<?>> involvedIndexes =
new TreeSet<OIndex<?>>(
new Comparator<OIndex<?>>() {
public int compare(OIndex<?> o1, OIndex<?> o2) {
return o1.getDefinition().getParamCount() - o2.getDefinition().getParamCount();
}
});
involvedIndexes.addAll(
oClass.getInvolvedIndexes(fieldChain.getItemName(fieldChain.getItemCount() - 1)));
final Collection<Class<? extends OIndex>> indexTypes = new HashSet<Class<? extends OIndex>>(3);
for (OIndex<?> involvedIndex : involvedIndexes) {
if (!indexTypes.contains(involvedIndex.getInternal().getClass())) {
result.add(involvedIndex);
indexTypes.add(involvedIndex.getInternal().getClass());
}
}
return result;
}
private static List<OIndex<?>> prepareBaseIndexes(
OClass iSchemaClass, OSQLFilterItemField.FieldChain fieldChain) {
List<OIndex<?>> result = new ArrayList<OIndex<?>>(fieldChain.getItemCount() - 1);
OClass oClass = iSchemaClass;
for (int i = 0; i < fieldChain.getItemCount() - 1; i++) {
final Set<OIndex<?>> involvedIndexes = oClass.getInvolvedIndexes(fieldChain.getItemName(i));
final OIndex<?> bestIndex = findBestIndex(involvedIndexes);
if (bestIndex == null) return null;
result.add(bestIndex);
oClass = oClass.getProperty(fieldChain.getItemName(i)).getLinkedClass();
}
return result;
}
private static Iterable<List<OIndex<?>>> getIndexesForChain(
OClass iSchemaClass, OSQLFilterItemField.FieldChain fieldChain) {
List<OIndex<?>> baseIndexes = prepareBaseIndexes(iSchemaClass, fieldChain);
if (baseIndexes == null) return Collections.emptyList();
Collection<OIndex<?>> lastIndexes = prepareLastIndexVariants(iSchemaClass, fieldChain);
Collection<List<OIndex<?>>> result = new ArrayList<List<OIndex<?>>>();
for (OIndex<?> lastIndex : lastIndexes) {
final List<OIndex<?>> indexes = new ArrayList<OIndex<?>>(fieldChain.getItemCount());
indexes.addAll(baseIndexes);
indexes.add(lastIndex);
result.add(indexes);
}
return result;
}
