Examples with OrderByEventComparator org.ballerinalang.siddhi.core.query.selector.OrderByEventComparator used on opensource projects

Example 1 with OrderByEventComparator

use of org.ballerinalang.siddhi.core.query.selector.OrderByEventComparator in project ballerina by ballerina-lang.

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 siddhiAppContext            query to be parsed
 * @param metaComplexEvent            Meta event used to collect execution info of stream associated with query
 * @param tableMap                    Table Map
 * @param variableExpressionExecutors variable expression executors
 * @param queryName                   query name of selector belongs to.
 * @param metaPosition                helps to identify the meta position of aggregates
 * @return QuerySelector
 */
public static QuerySelector parse(Selector selector, OutputStream outputStream, SiddhiAppContext siddhiAppContext, MetaComplexEvent metaComplexEvent, Map<String, Table> tableMap, List<VariableExpressionExecutor> variableExpressionExecutors, String queryName, int metaPosition) {
    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;
    }
    id = outputStream.getId();
    containsAggregatorThreadLocal.remove();
    QuerySelector querySelector = new QuerySelector(id, selector, currentOn, expiredOn, siddhiAppContext);
    List<AttributeProcessor> attributeProcessors = getAttributeProcessors(selector, id, siddhiAppContext, metaComplexEvent, tableMap, variableExpressionExecutors, outputStream, queryName, metaPosition);
    querySelector.setAttributeProcessorList(attributeProcessors, "true".equals(containsAggregatorThreadLocal.get()));
    containsAggregatorThreadLocal.remove();
    ConditionExpressionExecutor havingCondition = generateHavingExecutor(selector.getHavingExpression(), metaComplexEvent, siddhiAppContext, tableMap, variableExpressionExecutors, queryName);
    querySelector.setHavingConditionExecutor(havingCondition, "true".equals(containsAggregatorThreadLocal.get()));
    containsAggregatorThreadLocal.remove();
    if (!selector.getGroupByList().isEmpty()) {
        querySelector.setGroupByKeyGenerator(new GroupByKeyGenerator(selector.getGroupByList(), metaComplexEvent, SiddhiConstants.UNKNOWN_STATE, null, variableExpressionExecutors, siddhiAppContext, queryName));
    }
    if (!selector.getOrderByList().isEmpty()) {
        querySelector.setOrderByEventComparator(new OrderByEventComparator(selector.getOrderByList(), metaComplexEvent, SiddhiConstants.HAVING_STATE, null, variableExpressionExecutors, siddhiAppContext, queryName));
    }
    if (selector.getLimit() != null) {
        ExpressionExecutor expressionExecutor = ExpressionParser.parseExpression((Expression) selector.getLimit(), metaComplexEvent, SiddhiConstants.HAVING_STATE, tableMap, variableExpressionExecutors, siddhiAppContext, false, 0, queryName);
        containsAggregatorThreadLocal.remove();
        querySelector.setLimit(((Number) (((ConstantExpressionExecutor) expressionExecutor).getValue())).longValue());
    }
    return querySelector;
}