use of io.siddhi.core.query.selector.OrderByEventComparator in project siddhi by wso2.
the class SelectorParser method parse.
/**
* Parse Selector portion of a query and return corresponding QuerySelector.
*
* @param selector selector to be parsed
* @param outputStream output stream
* @param metaComplexEvent Meta event used to collect execution info of stream associated with query
* @param tableMap Table Map
* @param variableExpressionExecutors variable expression executors
* @param metaPosition helps to identify the meta position of aggregates
* @param processingMode processing mode of the query
* @param outputExpectsExpiredEvents is expired events sent as output
* @param siddhiQueryContext current siddhi query context
* @return QuerySelector
*/
public static QuerySelector parse(Selector selector, OutputStream outputStream, MetaComplexEvent metaComplexEvent, Map<String, Table> tableMap, List<VariableExpressionExecutor> variableExpressionExecutors, int metaPosition, ProcessingMode processingMode, boolean outputExpectsExpiredEvents, SiddhiQueryContext siddhiQueryContext) {
boolean currentOn = false;
boolean expiredOn = false;
String id = null;
if (outputStream.getOutputEventType() == OutputStream.OutputEventType.CURRENT_EVENTS || outputStream.getOutputEventType() == OutputStream.OutputEventType.ALL_EVENTS) {
currentOn = true;
}
if (outputStream.getOutputEventType() == OutputStream.OutputEventType.EXPIRED_EVENTS || outputStream.getOutputEventType() == OutputStream.OutputEventType.ALL_EVENTS) {
expiredOn = true;
}
boolean groupBy = !selector.getGroupByList().isEmpty();
id = outputStream.getId();
containsAggregatorThreadLocal.remove();
QuerySelector querySelector = new QuerySelector(id, selector, currentOn, expiredOn, siddhiQueryContext);
List<AttributeProcessor> attributeProcessors = getAttributeProcessors(selector, id, metaComplexEvent, tableMap, variableExpressionExecutors, outputStream, metaPosition, processingMode, outputExpectsExpiredEvents, groupBy, siddhiQueryContext);
querySelector.setAttributeProcessorList(attributeProcessors, "true".equals(containsAggregatorThreadLocal.get()));
containsAggregatorThreadLocal.remove();
ConditionExpressionExecutor havingCondition = generateHavingExecutor(selector.getHavingExpression(), metaComplexEvent, tableMap, variableExpressionExecutors, siddhiQueryContext);
querySelector.setHavingConditionExecutor(havingCondition, "true".equals(containsAggregatorThreadLocal.get()));
containsAggregatorThreadLocal.remove();
if (!selector.getGroupByList().isEmpty()) {
List<Expression> groupByExpressionList = selector.getGroupByList().stream().map(groupByVariable -> (Expression) groupByVariable).collect(Collectors.toList());
querySelector.setGroupByKeyGenerator(new GroupByKeyGenerator(groupByExpressionList, metaComplexEvent, SiddhiConstants.UNKNOWN_STATE, null, variableExpressionExecutors, siddhiQueryContext));
}
if (!selector.getOrderByList().isEmpty()) {
querySelector.setOrderByEventComparator(new OrderByEventComparator(selector.getOrderByList(), metaComplexEvent, SiddhiConstants.HAVING_STATE, null, variableExpressionExecutors, siddhiQueryContext));
}
if (selector.getLimit() != null) {
ExpressionExecutor expressionExecutor = ExpressionParser.parseExpression((Expression) selector.getLimit(), metaComplexEvent, SiddhiConstants.HAVING_STATE, tableMap, variableExpressionExecutors, false, 0, ProcessingMode.BATCH, false, siddhiQueryContext);
containsAggregatorThreadLocal.remove();
querySelector.setLimit(((Number) (((ConstantExpressionExecutor) expressionExecutor).getValue())).longValue());
}
if (selector.getOffset() != null) {
ExpressionExecutor expressionExecutor = ExpressionParser.parseExpression((Expression) selector.getOffset(), metaComplexEvent, SiddhiConstants.HAVING_STATE, tableMap, variableExpressionExecutors, false, 0, ProcessingMode.BATCH, false, siddhiQueryContext);
containsAggregatorThreadLocal.remove();
querySelector.setOffset(((Number) (((ConstantExpressionExecutor) expressionExecutor).getValue())).longValue());
}
return querySelector;
}
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