/// extract from index values
private ArrayList<Long> ExtractFromIndex(
NodeReference node,
ArrayList<Long> previousSetToScan,
FilterExpression expression,
ArrayList<FilterCondition> conditions,
String indexName) {
ArrayList<Long> setToScan = new ArrayList<Long>();
// prepare range
ArrayList<FilterCondition> range = PrepareIndexRangeByConditions(conditions);
if (range == null) return setToScan;
FilterCondition left = range.get(0);
FilterCondition right = range.get(1);
String leftsubscript = "";
if (left != null) {
leftsubscript = left.FilterValue.toString();
}
String rightsubscript = "";
if (right != null) {
rightsubscript = right.FilterValue.toString();
}
rightsubscript = IndexManager.ConvertToIndex(rightsubscript);
leftsubscript = IndexManager.ConvertToIndex(leftsubscript);
String key = "";
while (true) {
key = node.nextSubscript(indexName, leftsubscript, key);
if (key.equals("")) {
leftsubscript = node.nextSubscript(indexName, leftsubscript);
key = node.nextSubscript(indexName, leftsubscript, key);
}
if (key.equals("")) {
break;
}
if (leftsubscript.equals(rightsubscript)) {
break;
}
Long parsedKey = Long.parseLong(key);
if (previousSetToScan == null || (!previousSetToScan.contains(parsedKey))) continue;
setToScan.add(parsedKey);
}
return setToScan;
}
