Examples with And org.wso2.siddhi.query.api.expression.condition.And used on opensource projects

Example 1 with And

use of org.wso2.siddhi.query.api.expression.condition.And in project jaggery by wso2.

the class DatabaseHostObject method executeBatch.

@edu.umd.cs.findbugs.annotations.SuppressFBWarnings("SQL_INJECTION_JDBC")
private static Object executeBatch(Context cx, final DatabaseHostObject db, NativeArray queries, NativeArray params, final Function callback) throws ScriptException, SQLException {
    if (params != null && (queries.getLength() != params.getLength())) {
        String msg = "Query array and values array should be in the same size. HostObject : " + hostObjectName + ", Method : query";
        log.warn(msg);
        throw new ScriptException(msg);
    }
    final Statement stmt = db.conn.createStatement();
    for (int index : (Integer[]) queries.getIds()) {
        Object obj = queries.get(index, db);
        if (!(obj instanceof String)) {
            String msg = "Invalid query type : " + obj.toString() + ". Query should be a string";
            log.warn(msg);
            throw new ScriptException(msg);
        }
        String query = (String) obj;
        if (params != null) {
            Object valObj = params.get(index, db);
            if (!(valObj instanceof NativeArray)) {
                String msg = "Invalid value type : " + obj.toString() + " for the query " + query;
                log.warn(msg);
                throw new ScriptException(msg);
            }
            query = replaceWildcards(db, query, (NativeArray) valObj);
        }
        stmt.addBatch(query);
    }
    if (callback != null) {
        final ContextFactory factory = cx.getFactory();
        final ExecutorService es = Executors.newSingleThreadExecutor();
        es.submit(new Callable() {

            public Object call() throws Exception {
                Context ctx = RhinoEngine.enterContext(factory);
                try {
                    int[] result = stmt.executeBatch();
                    callback.call(ctx, db, db, new Object[] { result });
                } catch (SQLException e) {
                    log.warn(e);
                } finally {
                    es.shutdown();
                    RhinoEngine.exitContext();
                }
                return null;
            }
        });
        return null;
    } else {
        return stmt.executeBatch();
    }
}

Example 2 with And

use of org.wso2.siddhi.query.api.expression.condition.And in project siddhi by wso2.

the class SiddhiDebuggerClient method start.

/**
 * Start the {@link SiddhiDebuggerClient} and configure the breakpoints.
 *
 * @param siddhiApp the Siddhi query
 * @param input         the user input as a whole text
 */
public void start(final String siddhiApp, String input) {
    SiddhiManager siddhiManager = new SiddhiManager();
    info("Deploying the siddhi app");
    final SiddhiAppRuntime siddhiAppRuntime = siddhiManager.createSiddhiAppRuntime(siddhiApp);
    // Add callbacks for all the streams
    final Set<String> streamNames = SiddhiCompiler.parse(siddhiApp).getStreamDefinitionMap().keySet();
    for (String streamName : streamNames) {
        final String stream = streamName;
        siddhiAppRuntime.addCallback(stream, new StreamCallback() {

            @Override
            public void receive(Event[] events) {
                info("@Receive: Stream: " + stream + ", Event: " + Arrays.deepToString(events));
            }
        });
    }
    SiddhiDebugger siddhiDebugger = siddhiAppRuntime.debug();
    final InputFeeder inputFeeder = new InputFeeder(siddhiAppRuntime, input);
    System.out.println("Configure the breakpoints.\nYou can use the following commands:\n - " + ADD_BREAKPOINT + "<query name>:<IN/OUT>\n - " + REMOVE_BREAKPOINT + "<query name>:<IN/OUT>\n - " + START + "\n - " + STOP);
    printNextLine();
    final Scanner scanner = new Scanner(System.in, "UTF-8");
    while (scanner.hasNextLine()) {
        String userInput = scanner.nextLine().trim();
        String command = userInput.toLowerCase();
        if (command.startsWith(ADD_BREAKPOINT)) {
            if (!command.contains(QUERY_DELIMITER)) {
                error("Invalid add query. The query must be " + ADD_BREAKPOINT + "<query " + "name>:<IN/OUT>. Please try again");
                printNextLine();
                continue;
            }
            String[] components = userInput.substring(ADD_BREAKPOINT.length(), userInput.length()).split(QUERY_DELIMITER);
            String queryName = components[0];
            String terminal = components[1].toLowerCase();
            if (IN.equals(terminal)) {
                siddhiDebugger.acquireBreakPoint(queryName, SiddhiDebugger.QueryTerminal.IN);
                info("Added a breakpoint at the IN terminal of " + queryName);
                printNextLine();
            } else if (OUT.equals(terminal)) {
                siddhiDebugger.acquireBreakPoint(queryName, SiddhiDebugger.QueryTerminal.OUT);
                info("Added a breakpoint at the OUT terminal of " + queryName);
                printNextLine();
            } else {
                error("The terminal must be either IN or OUT but found: " + terminal.toUpperCase() + ". Please try again");
                printNextLine();
            }
        } else if (command.startsWith(REMOVE_BREAKPOINT)) {
            if (!command.contains(QUERY_DELIMITER)) {
                error("Invalid add query. The query must be " + REMOVE_BREAKPOINT + "<query " + "name>:<IN/OUT>. Please try again");
                printNextLine();
                continue;
            }
            String[] components = command.substring(ADD_BREAKPOINT.length(), command.length()).split(QUERY_DELIMITER);
            String queryName = components[0];
            String terminal = components[1];
            if (IN.equals(terminal)) {
                siddhiDebugger.releaseBreakPoint(queryName, SiddhiDebugger.QueryTerminal.IN);
                info("Removed the breakpoint at the IN terminal of " + queryName);
                printNextLine();
            } else if (OUT.equals(terminal)) {
                siddhiDebugger.releaseBreakPoint(queryName, SiddhiDebugger.QueryTerminal.OUT);
                info("Removed the breakpoint at the OUT terminal of " + queryName);
                printNextLine();
            } else {
                error("The terminal must be either IN or OUT but found: " + terminal.toUpperCase());
                printNextLine();
            }
        } else if (STOP.equals(command)) {
            inputFeeder.stop();
            siddhiAppRuntime.shutdown();
            break;
        } else if (START.equals(command)) {
            inputFeeder.start();
            info("Siddhi Debugger starts sending input to Siddhi");
            System.out.println("You can use the following commands:\n - " + NEXT + "\n - " + PLAY + "\n - " + STATE + ":<query name>\n - " + STOP);
            break;
        } else {
            error("Invalid command: " + command);
            printNextLine();
        }
    }
    siddhiDebugger.setDebuggerCallback(new SiddhiDebuggerCallback() {

        @Override
        public void debugEvent(ComplexEvent event, String queryName, SiddhiDebugger.QueryTerminal queryTerminal, SiddhiDebugger debugger) {
            info("@Debug: Query: " + queryName + ", Terminal: " + queryTerminal + ", Event: " + event);
            printNextLine();
            while (scanner.hasNextLine()) {
                String command = scanner.nextLine().trim().toLowerCase();
                if (STOP.equals(command)) {
                    debugger.releaseAllBreakPoints();
                    debugger.play();
                    inputFeeder.stop();
                    siddhiAppRuntime.shutdown();
                    break;
                } else if (NEXT.equals(command)) {
                    debugger.next();
                    break;
                } else if (PLAY.equals(command)) {
                    debugger.play();
                    break;
                } else if (command.startsWith(STATE)) {
                    if (!command.contains(QUERY_DELIMITER)) {
                        error("Invalid get state request. The query must be " + STATE + ":<query " + "name>. Please try again");
                        printNextLine();
                        continue;
                    }
                    String[] components = command.split(QUERY_DELIMITER);
                    String requestQueryName = components[1];
                    Map<String, Object> state = debugger.getQueryState(requestQueryName.trim());
                    System.out.println("Query '" + requestQueryName + "' state : ");
                    for (Map.Entry<String, Object> entry : state.entrySet()) {
                        System.out.println("    '" + entry.getKey() + "' : " + entry.getValue());
                    }
                    printNextLine();
                    continue;
                } else {
                    error("Invalid command: " + command);
                    printNextLine();
                }
            }
        }
    });
    inputFeeder.join();
    if (inputFeeder.isRunning()) {
        info("Input feeder has sopped sending all inputs. If you want to stop the execution, use " + "the STOP command");
        printNextLine();
        while (scanner.hasNextLine()) {
            String command = scanner.nextLine().trim().toLowerCase();
            if (STOP.equals(command)) {
                inputFeeder.stop();
                siddhiAppRuntime.shutdown();
                break;
            } else {
                error("Invalid command: " + command);
                printNextLine();
            }
        }
    }
    scanner.close();
    info("Siddhi Debugger is stopped successfully");
}

Example 3 with And

use of org.wso2.siddhi.query.api.expression.condition.And in project siddhi by wso2.

the class ExternalTimeBatchWindowProcessor method process.

/**
 * Here an assumption is taken:
 * Parameter: timestamp: The time which the window determines as current time and will act upon,
 * the value of this parameter should be monotonically increasing.
 * from https://docs.wso2.com/display/CEP400/Inbuilt+Windows#InbuiltWindows-externalTime
 */
@Override
protected void process(ComplexEventChunk<StreamEvent> streamEventChunk, Processor nextProcessor, StreamEventCloner streamEventCloner) {
    // event incoming trigger process. No events means no action
    if (streamEventChunk.getFirst() == null) {
        return;
    }
    List<ComplexEventChunk<StreamEvent>> complexEventChunks = new ArrayList<ComplexEventChunk<StreamEvent>>();
    synchronized (this) {
        initTiming(streamEventChunk.getFirst());
        StreamEvent nextStreamEvent = streamEventChunk.getFirst();
        while (nextStreamEvent != null) {
            StreamEvent currStreamEvent = nextStreamEvent;
            nextStreamEvent = nextStreamEvent.getNext();
            if (currStreamEvent.getType() == ComplexEvent.Type.TIMER) {
                if (lastScheduledTime <= currStreamEvent.getTimestamp()) {
                    // implies that there have not been any more events after this schedule has been done.
                    if (!flushed) {
                        flushToOutputChunk(streamEventCloner, complexEventChunks, lastCurrentEventTime, true);
                        flushed = true;
                    } else {
                        if (currentEventChunk.getFirst() != null) {
                            appendToOutputChunk(streamEventCloner, complexEventChunks, lastCurrentEventTime, true);
                        }
                    }
                    // rescheduling to emit the current batch after expiring it if no further events arrive.
                    lastScheduledTime = siddhiAppContext.getTimestampGenerator().currentTime() + schedulerTimeout;
                    scheduler.notifyAt(lastScheduledTime);
                }
                continue;
            } else if (currStreamEvent.getType() != ComplexEvent.Type.CURRENT) {
                continue;
            }
            long currentEventTime = (Long) timestampExpressionExecutor.execute(currStreamEvent);
            if (lastCurrentEventTime < currentEventTime) {
                lastCurrentEventTime = currentEventTime;
            }
            if (currentEventTime < endTime) {
                cloneAppend(streamEventCloner, currStreamEvent);
            } else {
                if (flushed) {
                    appendToOutputChunk(streamEventCloner, complexEventChunks, lastCurrentEventTime, false);
                    flushed = false;
                } else {
                    flushToOutputChunk(streamEventCloner, complexEventChunks, lastCurrentEventTime, false);
                }
                // update timestamp, call next processor
                endTime = findEndTime(lastCurrentEventTime, startTime, timeToKeep);
                cloneAppend(streamEventCloner, currStreamEvent);
                // triggering the last batch expiration.
                if (schedulerTimeout > 0) {
                    lastScheduledTime = siddhiAppContext.getTimestampGenerator().currentTime() + schedulerTimeout;
                    scheduler.notifyAt(lastScheduledTime);
                }
            }
        }
    }
    for (ComplexEventChunk<StreamEvent> complexEventChunk : complexEventChunks) {
        nextProcessor.process(complexEventChunk);
    }
}

Example 4 with And

use of org.wso2.siddhi.query.api.expression.condition.And in project siddhi by wso2.

the class AggregationParser method parse.

public static AggregationRuntime parse(AggregationDefinition aggregationDefinition, SiddhiAppContext siddhiAppContext, Map<String, AbstractDefinition> streamDefinitionMap, Map<String, AbstractDefinition> tableDefinitionMap, Map<String, AbstractDefinition> windowDefinitionMap, Map<String, AbstractDefinition> aggregationDefinitionMap, Map<String, Table> tableMap, Map<String, Window> windowMap, Map<String, AggregationRuntime> aggregationMap, SiddhiAppRuntimeBuilder siddhiAppRuntimeBuilder) {
    if (aggregationDefinition == null) {
        throw new SiddhiAppCreationException("AggregationDefinition instance is null. " + "Hence, can't create the siddhi app '" + siddhiAppContext.getName() + "'");
    }
    if (aggregationDefinition.getTimePeriod() == null) {
        throw new SiddhiAppCreationException("AggregationDefinition '" + aggregationDefinition.getId() + "'s timePeriod is null. " + "Hence, can't create the siddhi app '" + siddhiAppContext.getName() + "'", aggregationDefinition.getQueryContextStartIndex(), aggregationDefinition.getQueryContextEndIndex());
    }
    if (aggregationDefinition.getSelector() == null) {
        throw new SiddhiAppCreationException("AggregationDefinition '" + aggregationDefinition.getId() + "'s selection is not defined. " + "Hence, can't create the siddhi app '" + siddhiAppContext.getName() + "'", aggregationDefinition.getQueryContextStartIndex(), aggregationDefinition.getQueryContextEndIndex());
    }
    if (streamDefinitionMap.get(aggregationDefinition.getBasicSingleInputStream().getStreamId()) == null) {
        throw new SiddhiAppCreationException("Stream " + aggregationDefinition.getBasicSingleInputStream().getStreamId() + " has not been defined");
    }
    try {
        List<VariableExpressionExecutor> incomingVariableExpressionExecutors = new ArrayList<>();
        String aggregatorName = aggregationDefinition.getId();
        StreamRuntime streamRuntime = InputStreamParser.parse(aggregationDefinition.getBasicSingleInputStream(), siddhiAppContext, streamDefinitionMap, tableDefinitionMap, windowDefinitionMap, aggregationDefinitionMap, tableMap, windowMap, aggregationMap, incomingVariableExpressionExecutors, null, false, aggregatorName);
        // Get original meta for later use.
        MetaStreamEvent incomingMetaStreamEvent = (MetaStreamEvent) streamRuntime.getMetaComplexEvent();
        // Create new meta stream event.
        // This must hold the timestamp, group by attributes (if given) and the incremental attributes, in
        // onAfterWindowData array
        // Example format: AGG_TIMESTAMP, groupByAttribute1, groupByAttribute2, AGG_incAttribute1, AGG_incAttribute2
        // AGG_incAttribute1, AGG_incAttribute2 would have the same attribute names as in
        // finalListOfIncrementalAttributes
        // To enter data as onAfterWindowData
        incomingMetaStreamEvent.initializeAfterWindowData();
        List<ExpressionExecutor> incomingExpressionExecutors = new ArrayList<>();
        List<IncrementalAttributeAggregator> incrementalAttributeAggregators = new ArrayList<>();
        List<Variable> groupByVariableList = aggregationDefinition.getSelector().getGroupByList();
        boolean isProcessingOnExternalTime = aggregationDefinition.getAggregateAttribute() != null;
        // Expressions to get
        List<Expression> outputExpressions = new ArrayList<>();
        // final aggregate outputs. e.g avg = sum/count
        // Expression executors to get
        List<ExpressionExecutor> outputExpressionExecutors = new ArrayList<>();
        // final aggregate outputs. e.g avg = sum/count
        populateIncomingAggregatorsAndExecutors(aggregationDefinition, siddhiAppContext, tableMap, incomingVariableExpressionExecutors, aggregatorName, incomingMetaStreamEvent, incomingExpressionExecutors, incrementalAttributeAggregators, groupByVariableList, outputExpressions);
        int baseAggregatorBeginIndex = incomingMetaStreamEvent.getOutputData().size();
        List<Expression> finalBaseAggregators = getFinalBaseAggregators(siddhiAppContext, tableMap, incomingVariableExpressionExecutors, aggregatorName, incomingMetaStreamEvent, incomingExpressionExecutors, incrementalAttributeAggregators);
        StreamDefinition incomingOutputStreamDefinition = StreamDefinition.id("");
        incomingOutputStreamDefinition.setQueryContextStartIndex(aggregationDefinition.getQueryContextStartIndex());
        incomingOutputStreamDefinition.setQueryContextEndIndex(aggregationDefinition.getQueryContextEndIndex());
        MetaStreamEvent processedMetaStreamEvent = new MetaStreamEvent();
        for (Attribute attribute : incomingMetaStreamEvent.getOutputData()) {
            incomingOutputStreamDefinition.attribute(attribute.getName(), attribute.getType());
            processedMetaStreamEvent.addOutputData(attribute);
        }
        incomingMetaStreamEvent.setOutputDefinition(incomingOutputStreamDefinition);
        processedMetaStreamEvent.addInputDefinition(incomingOutputStreamDefinition);
        processedMetaStreamEvent.setOutputDefinition(incomingOutputStreamDefinition);
        // Executors of processing meta
        List<VariableExpressionExecutor> processVariableExpressionExecutors = new ArrayList<>();
        boolean groupBy = aggregationDefinition.getSelector().getGroupByList().size() != 0;
        List<ExpressionExecutor> processExpressionExecutors = constructProcessExpressionExecutors(siddhiAppContext, tableMap, aggregatorName, baseAggregatorBeginIndex, finalBaseAggregators, incomingOutputStreamDefinition, processedMetaStreamEvent, processVariableExpressionExecutors, groupBy);
        outputExpressionExecutors.addAll(outputExpressions.stream().map(expression -> ExpressionParser.parseExpression(expression, processedMetaStreamEvent, 0, tableMap, processVariableExpressionExecutors, siddhiAppContext, groupBy, 0, aggregatorName)).collect(Collectors.toList()));
        // Create group by key generator
        GroupByKeyGenerator groupByKeyGenerator = null;
        if (groupBy) {
            groupByKeyGenerator = new GroupByKeyGenerator(groupByVariableList, processedMetaStreamEvent, SiddhiConstants.UNKNOWN_STATE, tableMap, processVariableExpressionExecutors, siddhiAppContext, aggregatorName);
        }
        // Create new scheduler
        EntryValveExecutor entryValveExecutor = new EntryValveExecutor(siddhiAppContext);
        LockWrapper lockWrapper = new LockWrapper(aggregatorName);
        lockWrapper.setLock(new ReentrantLock());
        Scheduler scheduler = SchedulerParser.parse(siddhiAppContext.getScheduledExecutorService(), entryValveExecutor, siddhiAppContext);
        scheduler.init(lockWrapper, aggregatorName);
        scheduler.setStreamEventPool(new StreamEventPool(processedMetaStreamEvent, 10));
        QueryParserHelper.reduceMetaComplexEvent(incomingMetaStreamEvent);
        QueryParserHelper.reduceMetaComplexEvent(processedMetaStreamEvent);
        QueryParserHelper.updateVariablePosition(incomingMetaStreamEvent, incomingVariableExpressionExecutors);
        QueryParserHelper.updateVariablePosition(processedMetaStreamEvent, processVariableExpressionExecutors);
        List<TimePeriod.Duration> incrementalDurations = getSortedPeriods(aggregationDefinition.getTimePeriod());
        Map<TimePeriod.Duration, Table> aggregationTables = initDefaultTables(aggregatorName, incrementalDurations, processedMetaStreamEvent.getOutputStreamDefinition(), siddhiAppRuntimeBuilder, aggregationDefinition.getAnnotations(), groupByVariableList);
        int bufferSize = 0;
        Element element = AnnotationHelper.getAnnotationElement(SiddhiConstants.ANNOTATION_BUFFER_SIZE, null, aggregationDefinition.getAnnotations());
        if (element != null) {
            try {
                bufferSize = Integer.parseInt(element.getValue());
            } catch (NumberFormatException e) {
                throw new SiddhiAppCreationException(e.getMessage() + ": BufferSize must be an integer");
            }
        }
        if (bufferSize > 0) {
            TimePeriod.Duration rootDuration = incrementalDurations.get(0);
            if (rootDuration == TimePeriod.Duration.MONTHS || rootDuration == TimePeriod.Duration.YEARS) {
                throw new SiddhiAppCreationException("A buffer size greater than 0 can be provided, only when the " + "first duration value is seconds, minutes, hours or days");
            }
            if (!isProcessingOnExternalTime) {
                throw new SiddhiAppCreationException("Buffer size cannot be specified when events are aggregated " + "based on event arrival time.");
            // Buffer size is used to process out of order events. However, events would never be out of
            // order if they are processed based on event arrival time.
            }
        } else if (bufferSize < 0) {
            throw new SiddhiAppCreationException("Expected a positive integer as the buffer size, but found " + bufferSize + " as the provided value");
        }
        boolean ignoreEventsOlderThanBuffer = false;
        element = AnnotationHelper.getAnnotationElement(SiddhiConstants.ANNOTATION_IGNORE_EVENTS_OLDER_THAN_BUFFER, null, aggregationDefinition.getAnnotations());
        if (element != null) {
            if (element.getValue().equalsIgnoreCase("true")) {
                ignoreEventsOlderThanBuffer = true;
            } else if (!element.getValue().equalsIgnoreCase("false")) {
                throw new SiddhiAppCreationException("IgnoreEventsOlderThanBuffer value must " + "be true or false");
            }
        }
        Map<TimePeriod.Duration, IncrementalExecutor> incrementalExecutorMap = buildIncrementalExecutors(isProcessingOnExternalTime, processedMetaStreamEvent, processExpressionExecutors, groupByKeyGenerator, bufferSize, ignoreEventsOlderThanBuffer, incrementalDurations, aggregationTables, siddhiAppContext, aggregatorName);
        // Recreate in-memory data from tables
        RecreateInMemoryData recreateInMemoryData = new RecreateInMemoryData(incrementalDurations, aggregationTables, incrementalExecutorMap, siddhiAppContext, processedMetaStreamEvent, tableMap, windowMap, aggregationMap);
        IncrementalExecutor rootIncrementalExecutor = incrementalExecutorMap.get(incrementalDurations.get(0));
        rootIncrementalExecutor.setScheduler(scheduler);
        // Connect entry valve to root incremental executor
        entryValveExecutor.setNextExecutor(rootIncrementalExecutor);
        QueryParserHelper.initStreamRuntime(streamRuntime, incomingMetaStreamEvent, lockWrapper, aggregatorName);
        LatencyTracker latencyTrackerFind = null;
        LatencyTracker latencyTrackerInsert = null;
        ThroughputTracker throughputTrackerFind = null;
        ThroughputTracker throughputTrackerInsert = null;
        if (siddhiAppContext.getStatisticsManager() != null) {
            latencyTrackerFind = QueryParserHelper.createLatencyTracker(siddhiAppContext, aggregationDefinition.getId(), SiddhiConstants.METRIC_INFIX_WINDOWS, SiddhiConstants.METRIC_TYPE_FIND);
            latencyTrackerInsert = QueryParserHelper.createLatencyTracker(siddhiAppContext, aggregationDefinition.getId(), SiddhiConstants.METRIC_INFIX_WINDOWS, SiddhiConstants.METRIC_TYPE_INSERT);
            throughputTrackerFind = QueryParserHelper.createThroughputTracker(siddhiAppContext, aggregationDefinition.getId(), SiddhiConstants.METRIC_INFIX_WINDOWS, SiddhiConstants.METRIC_TYPE_FIND);
            throughputTrackerInsert = QueryParserHelper.createThroughputTracker(siddhiAppContext, aggregationDefinition.getId(), SiddhiConstants.METRIC_INFIX_WINDOWS, SiddhiConstants.METRIC_TYPE_INSERT);
        }
        streamRuntime.setCommonProcessor(new IncrementalAggregationProcessor(rootIncrementalExecutor, incomingExpressionExecutors, processedMetaStreamEvent, latencyTrackerInsert, throughputTrackerInsert, siddhiAppContext));
        List<ExpressionExecutor> baseExecutors = cloneExpressionExecutors(processExpressionExecutors);
        ExpressionExecutor timestampExecutor = baseExecutors.remove(0);
        return new AggregationRuntime(aggregationDefinition, incrementalExecutorMap, aggregationTables, ((SingleStreamRuntime) streamRuntime), entryValveExecutor, incrementalDurations, siddhiAppContext, baseExecutors, timestampExecutor, processedMetaStreamEvent, outputExpressionExecutors, latencyTrackerFind, throughputTrackerFind, recreateInMemoryData);
    } catch (Throwable t) {
        ExceptionUtil.populateQueryContext(t, aggregationDefinition, siddhiAppContext);
        throw t;
    }
}

Example 5 with And

use of org.wso2.siddhi.query.api.expression.condition.And in project siddhi by wso2.

the class CollectionExpressionParser method parseInternalCollectionExpression.

/**
 * Parse the given expression and create the appropriate Executor by recursively traversing the expression.
 *
 * @param expression             Expression to be parsed
 * @param matchingMetaInfoHolder matchingMetaInfoHolder
 * @param indexedEventHolder     indexed event holder
 * @return ExpressionExecutor
 */
private static CollectionExpression parseInternalCollectionExpression(Expression expression, MatchingMetaInfoHolder matchingMetaInfoHolder, IndexedEventHolder indexedEventHolder) {
    if (expression instanceof And) {
        CollectionExpression leftCollectionExpression = parseInternalCollectionExpression(((And) expression).getLeftExpression(), matchingMetaInfoHolder, indexedEventHolder);
        CollectionExpression rightCollectionExpression = parseInternalCollectionExpression(((And) expression).getRightExpression(), matchingMetaInfoHolder, indexedEventHolder);
        if (leftCollectionExpression.getCollectionScope() == NON && rightCollectionExpression.getCollectionScope() == NON) {
            return new BasicCollectionExpression(expression, NON);
        } else if ((leftCollectionExpression.getCollectionScope() == PRIMARY_KEY_ATTRIBUTE || leftCollectionExpression.getCollectionScope() == PARTIAL_PRIMARY_KEY_ATTRIBUTE || leftCollectionExpression.getCollectionScope() == PRIMARY_KEY_RESULT_SET || leftCollectionExpression.getCollectionScope() == PARTIAL_PRIMARY_KEY_RESULT_SET) && (rightCollectionExpression.getCollectionScope() == PRIMARY_KEY_ATTRIBUTE || rightCollectionExpression.getCollectionScope() == PARTIAL_PRIMARY_KEY_ATTRIBUTE || rightCollectionExpression.getCollectionScope() == PRIMARY_KEY_RESULT_SET || rightCollectionExpression.getCollectionScope() == PARTIAL_PRIMARY_KEY_RESULT_SET)) {
            Set<String> primaryKeys = new HashSet<>();
            primaryKeys.addAll(leftCollectionExpression.getMultiPrimaryKeys());
            primaryKeys.addAll(rightCollectionExpression.getMultiPrimaryKeys());
            if (indexedEventHolder.getPrimaryKeyReferenceHolders() != null && primaryKeys.size() == indexedEventHolder.getPrimaryKeyReferenceHolders().length) {
                return new AndMultiPrimaryKeyCollectionExpression(expression, PRIMARY_KEY_RESULT_SET, leftCollectionExpression, rightCollectionExpression);
            } else {
                return new AndCollectionExpression(expression, PARTIAL_PRIMARY_KEY_RESULT_SET, leftCollectionExpression, rightCollectionExpression);
            }
        // TODO support query rewriting to group all PARTIAL_PRIMARY_KEY_RESULT_SETs together such that it can
        // build AndMultiPrimaryKeyCollectionExpression.
        } else if ((leftCollectionExpression.getCollectionScope() == PARTIAL_PRIMARY_KEY_ATTRIBUTE || leftCollectionExpression.getCollectionScope() == PARTIAL_PRIMARY_KEY_RESULT_SET || leftCollectionExpression.getCollectionScope() == NON || leftCollectionExpression.getCollectionScope() == EXHAUSTIVE) && (rightCollectionExpression.getCollectionScope() == PARTIAL_PRIMARY_KEY_ATTRIBUTE || rightCollectionExpression.getCollectionScope() == PARTIAL_PRIMARY_KEY_RESULT_SET || rightCollectionExpression.getCollectionScope() == NON || rightCollectionExpression.getCollectionScope() == EXHAUSTIVE)) {
            return new BasicCollectionExpression(expression, EXHAUSTIVE);
        } else {
            return new AndCollectionExpression(expression, OPTIMISED_PRIMARY_KEY_OR_INDEXED_RESULT_SET, leftCollectionExpression, rightCollectionExpression);
        }
    } else if (expression instanceof Or) {
        CollectionExpression leftCollectionExpression = parseInternalCollectionExpression(((Or) expression).getLeftExpression(), matchingMetaInfoHolder, indexedEventHolder);
        CollectionExpression rightCollectionExpression = parseInternalCollectionExpression(((Or) expression).getRightExpression(), matchingMetaInfoHolder, indexedEventHolder);
        if (leftCollectionExpression.getCollectionScope() == NON && rightCollectionExpression.getCollectionScope() == NON) {
            return new BasicCollectionExpression(expression, NON);
        } else if (leftCollectionExpression.getCollectionScope() == EXHAUSTIVE || leftCollectionExpression.getCollectionScope() == PARTIAL_PRIMARY_KEY_ATTRIBUTE || leftCollectionExpression.getCollectionScope() == PARTIAL_PRIMARY_KEY_RESULT_SET || rightCollectionExpression.getCollectionScope() == EXHAUSTIVE || rightCollectionExpression.getCollectionScope() == PARTIAL_PRIMARY_KEY_ATTRIBUTE || rightCollectionExpression.getCollectionScope() == PARTIAL_PRIMARY_KEY_RESULT_SET) {
            return new BasicCollectionExpression(expression, EXHAUSTIVE);
        } else {
            return new OrCollectionExpression(expression, OPTIMISED_PRIMARY_KEY_OR_INDEXED_RESULT_SET, leftCollectionExpression, rightCollectionExpression);
        }
    } else if (expression instanceof Not) {
        CollectionExpression notCollectionExpression = parseInternalCollectionExpression(((Not) expression).getExpression(), matchingMetaInfoHolder, indexedEventHolder);
        switch(notCollectionExpression.getCollectionScope()) {
            case NON:
                return new BasicCollectionExpression(expression, NON);
            case PRIMARY_KEY_ATTRIBUTE:
                return new NotCollectionExpression(expression, PRIMARY_KEY_RESULT_SET, notCollectionExpression);
            case INDEXED_ATTRIBUTE:
                return new NotCollectionExpression(expression, INDEXED_RESULT_SET, notCollectionExpression);
            case PRIMARY_KEY_RESULT_SET:
            case INDEXED_RESULT_SET:
            case OPTIMISED_PRIMARY_KEY_OR_INDEXED_RESULT_SET:
                return new NotCollectionExpression(expression, OPTIMISED_PRIMARY_KEY_OR_INDEXED_RESULT_SET, notCollectionExpression);
            case PARTIAL_PRIMARY_KEY_ATTRIBUTE:
            case PARTIAL_PRIMARY_KEY_RESULT_SET:
            case EXHAUSTIVE:
                return new BasicCollectionExpression(expression, EXHAUSTIVE);
        }
    } else if (expression instanceof Compare) {
        CollectionExpression leftCollectionExpression = parseInternalCollectionExpression(((Compare) expression).getLeftExpression(), matchingMetaInfoHolder, indexedEventHolder);
        CollectionExpression rightCollectionExpression = parseInternalCollectionExpression(((Compare) expression).getRightExpression(), matchingMetaInfoHolder, indexedEventHolder);
        if (leftCollectionExpression.getCollectionScope() == NON && rightCollectionExpression.getCollectionScope() == NON) {
            // comparing two stream attributes with O(1) time complexity
            return new BasicCollectionExpression(expression, NON);
        } else if ((leftCollectionExpression.getCollectionScope() == INDEXED_ATTRIBUTE || leftCollectionExpression.getCollectionScope() == PRIMARY_KEY_ATTRIBUTE || leftCollectionExpression.getCollectionScope() == PARTIAL_PRIMARY_KEY_ATTRIBUTE) && rightCollectionExpression.getCollectionScope() == NON) {
            switch(leftCollectionExpression.getCollectionScope()) {
                case INDEXED_ATTRIBUTE:
                    return new CompareCollectionExpression((Compare) expression, INDEXED_RESULT_SET, leftCollectionExpression, ((Compare) expression).getOperator(), rightCollectionExpression);
                case PRIMARY_KEY_ATTRIBUTE:
                    return new CompareCollectionExpression((Compare) expression, PRIMARY_KEY_RESULT_SET, leftCollectionExpression, ((Compare) expression).getOperator(), rightCollectionExpression);
                case PARTIAL_PRIMARY_KEY_ATTRIBUTE:
                    return new CompareCollectionExpression((Compare) expression, PARTIAL_PRIMARY_KEY_RESULT_SET, leftCollectionExpression, ((Compare) expression).getOperator(), rightCollectionExpression);
            }
        } else if (leftCollectionExpression.getCollectionScope() == NON && (rightCollectionExpression.getCollectionScope() == INDEXED_ATTRIBUTE || rightCollectionExpression.getCollectionScope() == PRIMARY_KEY_ATTRIBUTE || rightCollectionExpression.getCollectionScope() == PARTIAL_PRIMARY_KEY_ATTRIBUTE)) {
            Compare.Operator operator = ((Compare) expression).getOperator();
            // moving let to right
            switch(operator) {
                case LESS_THAN:
                    operator = Compare.Operator.GREATER_THAN;
                    break;
                case GREATER_THAN:
                    operator = Compare.Operator.LESS_THAN;
                    break;
                case LESS_THAN_EQUAL:
                    operator = Compare.Operator.GREATER_THAN_EQUAL;
                    break;
                case GREATER_THAN_EQUAL:
                    operator = Compare.Operator.LESS_THAN_EQUAL;
                    break;
                case EQUAL:
                    break;
                case NOT_EQUAL:
                    break;
            }
            switch(rightCollectionExpression.getCollectionScope()) {
                case INDEXED_ATTRIBUTE:
                    return new CompareCollectionExpression((Compare) expression, INDEXED_RESULT_SET, rightCollectionExpression, operator, leftCollectionExpression);
                case PRIMARY_KEY_ATTRIBUTE:
                    return new CompareCollectionExpression((Compare) expression, PRIMARY_KEY_RESULT_SET, rightCollectionExpression, operator, leftCollectionExpression);
                case PARTIAL_PRIMARY_KEY_ATTRIBUTE:
                    return new CompareCollectionExpression((Compare) expression, PARTIAL_PRIMARY_KEY_RESULT_SET, rightCollectionExpression, operator, leftCollectionExpression);
            }
        } else {
            // comparing non indexed table with stream attributes or another table attribute
            return new BasicCollectionExpression(expression, EXHAUSTIVE);
        }
    } else if (expression instanceof Constant) {
        return new BasicCollectionExpression(expression, NON);
    } else if (expression instanceof Variable) {
        if (isCollectionVariable(matchingMetaInfoHolder, (Variable) expression)) {
            if (indexedEventHolder.isAttributeIndexed(((Variable) expression).getAttributeName())) {
                return new AttributeCollectionExpression(expression, ((Variable) expression).getAttributeName(), INDEXED_ATTRIBUTE);
            } else if (indexedEventHolder.isMultiPrimaryKeyAttribute(((Variable) expression).getAttributeName())) {
                if (indexedEventHolder.getPrimaryKeyReferenceHolders() != null && indexedEventHolder.getPrimaryKeyReferenceHolders().length == 1) {
                    return new AttributeCollectionExpression(expression, ((Variable) expression).getAttributeName(), PRIMARY_KEY_ATTRIBUTE);
                } else {
                    return new AttributeCollectionExpression(expression, ((Variable) expression).getAttributeName(), PARTIAL_PRIMARY_KEY_ATTRIBUTE);
                }
            } else {
                return new BasicCollectionExpression(expression, EXHAUSTIVE);
            }
        } else {
            return new BasicCollectionExpression(expression, NON);
        }
    } else if (expression instanceof Multiply) {
        CollectionExpression left = parseInternalCollectionExpression(((Multiply) expression).getLeftValue(), matchingMetaInfoHolder, indexedEventHolder);
        CollectionExpression right = parseInternalCollectionExpression(((Multiply) expression).getRightValue(), matchingMetaInfoHolder, indexedEventHolder);
        if (left.getCollectionScope() == NON && right.getCollectionScope() == NON) {
            return new BasicCollectionExpression(expression, NON);
        } else {
            return new BasicCollectionExpression(expression, EXHAUSTIVE);
        }
    } else if (expression instanceof Add) {
        CollectionExpression left = parseInternalCollectionExpression(((Add) expression).getLeftValue(), matchingMetaInfoHolder, indexedEventHolder);
        CollectionExpression right = parseInternalCollectionExpression(((Add) expression).getRightValue(), matchingMetaInfoHolder, indexedEventHolder);
        if (left.getCollectionScope() == NON && right.getCollectionScope() == NON) {
            return new BasicCollectionExpression(expression, NON);
        } else {
            return new BasicCollectionExpression(expression, EXHAUSTIVE);
        }
    } else if (expression instanceof Subtract) {
        CollectionExpression left = parseInternalCollectionExpression(((Subtract) expression).getLeftValue(), matchingMetaInfoHolder, indexedEventHolder);
        CollectionExpression right = parseInternalCollectionExpression(((Subtract) expression).getRightValue(), matchingMetaInfoHolder, indexedEventHolder);
        if (left.getCollectionScope() == NON && right.getCollectionScope() == NON) {
            return new BasicCollectionExpression(expression, NON);
        } else {
            return new BasicCollectionExpression(expression, EXHAUSTIVE);
        }
    } else if (expression instanceof Mod) {
        CollectionExpression left = parseInternalCollectionExpression(((Mod) expression).getLeftValue(), matchingMetaInfoHolder, indexedEventHolder);
        CollectionExpression right = parseInternalCollectionExpression(((Mod) expression).getRightValue(), matchingMetaInfoHolder, indexedEventHolder);
        if (left.getCollectionScope() == NON && right.getCollectionScope() == NON) {
            return new BasicCollectionExpression(expression, NON);
        } else {
            return new BasicCollectionExpression(expression, EXHAUSTIVE);
        }
    } else if (expression instanceof Divide) {
        CollectionExpression left = parseInternalCollectionExpression(((Divide) expression).getLeftValue(), matchingMetaInfoHolder, indexedEventHolder);
        CollectionExpression right = parseInternalCollectionExpression(((Divide) expression).getRightValue(), matchingMetaInfoHolder, indexedEventHolder);
        if (left.getCollectionScope() == NON && right.getCollectionScope() == NON) {
            return new BasicCollectionExpression(expression, NON);
        } else {
            return new BasicCollectionExpression(expression, EXHAUSTIVE);
        }
    } else if (expression instanceof AttributeFunction) {
        Expression[] innerExpressions = ((AttributeFunction) expression).getParameters();
        for (Expression aExpression : innerExpressions) {
            CollectionExpression aCollectionExpression = parseInternalCollectionExpression(aExpression, matchingMetaInfoHolder, indexedEventHolder);
            if (aCollectionExpression.getCollectionScope() != NON) {
                return new BasicCollectionExpression(expression, EXHAUSTIVE);
            }
        }
        return new BasicCollectionExpression(expression, NON);
    } else if (expression instanceof In) {
        CollectionExpression inCollectionExpression = parseInternalCollectionExpression(((In) expression).getExpression(), matchingMetaInfoHolder, indexedEventHolder);
        if (inCollectionExpression.getCollectionScope() != NON) {
            return new BasicCollectionExpression(expression, EXHAUSTIVE);
        }
        return new BasicCollectionExpression(expression, NON);
    } else if (expression instanceof IsNull) {
        CollectionExpression nullCollectionExpression = parseInternalCollectionExpression(((IsNull) expression).getExpression(), matchingMetaInfoHolder, indexedEventHolder);
        if (nullCollectionExpression.getCollectionScope() == NON) {
            return new BasicCollectionExpression(expression, NON);
        } else if (nullCollectionExpression.getCollectionScope() == INDEXED_ATTRIBUTE) {
            return new NullCollectionExpression(expression, INDEXED_RESULT_SET, ((AttributeCollectionExpression) nullCollectionExpression).getAttribute());
        } else if (nullCollectionExpression.getCollectionScope() == PRIMARY_KEY_ATTRIBUTE) {
            return new NullCollectionExpression(expression, PRIMARY_KEY_RESULT_SET, ((AttributeCollectionExpression) nullCollectionExpression).getAttribute());
        } else {
            return new BasicCollectionExpression(expression, EXHAUSTIVE);
        }
    }
    throw new UnsupportedOperationException(expression.toString() + " not supported!");
}