/**************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
**************************************************************************************/
package com.espertech.esper.epl.expression;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventPropertyGetter;
import com.espertech.esper.client.EventType;
import com.espertech.esper.client.FragmentEventType;
import com.espertech.esper.epl.spec.StatementSpecRaw;
import com.espertech.esper.event.EventAdapterService;
import com.espertech.esper.event.EventBeanUtility;
import com.espertech.esper.util.JavaClassHelper;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.util.*;
/**
* Represents a subselect in an expression tree.
*/
public class ExprSubselectRowNode extends ExprSubselectNode
{
private static final Log log = LogFactory.getLog(ExprSubselectRowNode.class);
private static final long serialVersionUID = -7865711714805807559L;
public static final SubqueryEvalStrategy UNFILTERED_UNSELECTED = new SubqueryEvalStrategyUnfilteredUnselected();
public static final SubqueryEvalStrategy UNFILTERED_SELECTED = new SubqueryEvalStrategyUnfilteredSelected();
public static final SubqueryEvalStrategy FILTERED_UNSELECTED = new SubqueryEvalStrategyFilteredUnselected();
public static final SubqueryEvalStrategy FILTERED_SELECTED = new SubqueryEvalStrategyFilteredSelected();
public static final SubqueryEvalStrategy UNFILTERED_SELECTED_GROUPED = new SubqueryEvalStrategyUnfilteredSelectedGroupedAgg();
private transient SubselectMultirowType subselectMultirowType;
private transient SubqueryEvalStrategy evalStrategy;
/**
* Ctor.
* @param statementSpec is the lookup statement spec from the parser, unvalidated
*/
public ExprSubselectRowNode(StatementSpecRaw statementSpec) {
super(statementSpec);
}
public Class getType() {
if (selectClause == null) { // wildcards allowed
return rawEventType.getUnderlyingType();
}
if (selectClause.length == 1) {
return JavaClassHelper.getBoxedType(selectClause[0].getExprEvaluator().getType());
}
return null;
}
public void validateSubquery(ExprValidationContext validationContext) throws ExprValidationException
{
// Strategy for subselect depends on presence of filter + presence of select clause expressions
if (filterExpr == null) {
if (selectClause == null) {
evalStrategy = UNFILTERED_UNSELECTED;
}
else {
if (getStatementSpecCompiled().getGroupByExpressions() != null && getStatementSpecCompiled().getGroupByExpressions().length > 0) {
evalStrategy = UNFILTERED_SELECTED_GROUPED;
}
else {
evalStrategy = UNFILTERED_SELECTED;
}
}
}
else { // the filter expression is handled elsewhere if there is any aggregation
if (selectClause == null) {
evalStrategy = FILTERED_UNSELECTED;
}
else {
evalStrategy = FILTERED_SELECTED;
}
}
}
public Object evaluate(EventBean[] eventsPerStream, boolean isNewData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext)
{
if (matchingEvents == null || matchingEvents.size() == 0) {
return null;
}
return evalStrategy.evaluate(eventsPerStream, isNewData, matchingEvents, exprEvaluatorContext, this);
}
public Collection<EventBean> evaluateGetCollEvents(EventBean[] eventsPerStream, boolean isNewData, Collection<EventBean> matchingEvents, ExprEvaluatorContext context) {
if (matchingEvents == null) {
return null;
}
if (matchingEvents.size() == 0) {
return Collections.emptyList();
}
return evalStrategy.evaluateGetCollEvents(eventsPerStream, isNewData, matchingEvents, context, this);
}
public Collection evaluateGetCollScalar(EventBean[] eventsPerStream, boolean isNewData, Collection<EventBean> matchingEvents, ExprEvaluatorContext context) {
if (matchingEvents == null) {
return null;
}
if (matchingEvents.size() == 0) {
return Collections.emptyList();
}
return evalStrategy.evaluateGetCollScalar(eventsPerStream, isNewData, matchingEvents, context, this);
}
public EventBean evaluateGetEventBean(EventBean[] eventsPerStream, boolean isNewData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext) {
if (matchingEvents == null || matchingEvents.size() == 0) {
return null;
}
return evalStrategy.evaluateGetEventBean(eventsPerStream, isNewData, matchingEvents, exprEvaluatorContext, this);
}
public Object[] evaluateTypableSingle(EventBean[] eventsPerStream, boolean isNewData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext) {
if (matchingEvents == null || matchingEvents.size() == 0) {
return null;
}
return evalStrategy.typableEvaluate(eventsPerStream, isNewData, matchingEvents, exprEvaluatorContext, this);
}
public Object[][] evaluateTypableMulti(EventBean[] eventsPerStream, boolean isNewData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext) {
if (matchingEvents == null) {
return null;
}
if (matchingEvents.size() == 0) {
return new Object[0][];
}
return evalStrategy.typableEvaluateMultirow(eventsPerStream, isNewData, matchingEvents, exprEvaluatorContext, this);
}
public LinkedHashMap<String, Object> typableGetRowProperties() throws ExprValidationException {
if ((selectClause == null) || (selectClause.length < 2)) {
return null;
}
return getRowType();
}
public EventType getEventTypeSingle(EventAdapterService eventAdapterService, String statementId) throws ExprValidationException {
if (selectClause == null) {
return null;
}
if (this.getSubselectAggregationType() != SubqueryAggregationType.FULLY_AGGREGATED) {
return null;
}
return getAssignAnonymousType(eventAdapterService, statementId);
}
public EventType getEventTypeCollection(EventAdapterService eventAdapterService, String statementId) throws ExprValidationException {
if (selectClause == null) { // wildcards allowed
return rawEventType;
}
// special case: selecting a single property that is itself an event
if (selectClause.length == 1 && selectClause[0] instanceof ExprIdentNode) {
ExprIdentNode identNode = (ExprIdentNode) selectClause[0];
FragmentEventType fragment = rawEventType.getFragmentType(identNode.getResolvedPropertyName());
if (fragment != null && !fragment.isIndexed()) {
return fragment.getFragmentType();
}
}
// select of a single value otherwise results in a collection of scalar values
if (selectClause.length == 1) {
return null;
}
// fully-aggregated always returns zero or one row
if (this.getSubselectAggregationType() == SubqueryAggregationType.FULLY_AGGREGATED) {
return null;
}
return getAssignAnonymousType(eventAdapterService, statementId);
}
private EventType getAssignAnonymousType(EventAdapterService eventAdapterService, String statementId) throws ExprValidationException {
Map<String, Object> rowType = getRowType();
EventType resultEventType = eventAdapterService.createAnonymousMapType(statementId + "_subquery_" + this.getSubselectNumber(), rowType);
subselectMultirowType = new SubselectMultirowType(resultEventType, eventAdapterService);
return resultEventType;
}
public Class getComponentTypeCollection() throws ExprValidationException {
if (selectClause == null) { // wildcards allowed
return null;
}
if (selectClauseEvaluator.length > 1) {
return null;
}
return selectClauseEvaluator[0].getType();
}
public boolean isAllowMultiColumnSelect() {
return true;
}
private LinkedHashMap<String, Object> getRowType() throws ExprValidationException {
Set<String> uniqueNames = new HashSet<String>();
LinkedHashMap<String, Object> type = new LinkedHashMap<String, Object>();
for (int i = 0; i < selectClause.length; i++) {
String assignedName = this.selectAsNames[i];
if (assignedName == null) {
assignedName = selectClause[i].toExpressionString();
}
if (uniqueNames.add(assignedName)) {
type.put(assignedName, selectClause[i].getExprEvaluator().getType());
}
else {
throw new ExprValidationException("Column " + i + " in subquery does not have a unique column name assigned");
}
}
return type;
}
public Object getMultirowMessage() {
return "Subselect of statement '" + statementName + "' returned more then one row in subselect " + subselectNumber + " '" + toExpressionString() + "', returning null result";
}
protected Map<String, Object> evaluateRow(EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext context) {
Map<String, Object> map = new HashMap<String, Object>();
for (int i = 0; i < selectClauseEvaluator.length; i++) {
Object resultEntry = selectClauseEvaluator[i].evaluate(eventsPerStream, isNewData, context);
map.put(selectAsNames[i], resultEntry);
}
return map;
}
private static class SubselectMultirowType {
private final EventType eventType;
private final EventAdapterService eventAdapterService;
private SubselectMultirowType(EventType eventType, EventAdapterService eventAdapterService) {
this.eventType = eventType;
this.eventAdapterService = eventAdapterService;
}
public EventType getEventType() {
return eventType;
}
public EventAdapterService getEventAdapterService() {
return eventAdapterService;
}
}
private static interface SubqueryEvalStrategy {
public Object evaluate(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext, ExprSubselectRowNode exprSubselectRowNode);
public Collection<EventBean> evaluateGetCollEvents(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext context, ExprSubselectRowNode parent);
public Collection evaluateGetCollScalar(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext context, ExprSubselectRowNode parent);
public Object[] typableEvaluate(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext, ExprSubselectRowNode parent);
public Object[][] typableEvaluateMultirow(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext, ExprSubselectRowNode parent);
public EventBean evaluateGetEventBean(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext, ExprSubselectRowNode exprSubselectRowNode);
}
private static class SubqueryEvalStrategyUnfilteredUnselected implements SubqueryEvalStrategy {
// No filter and no select-clause: return underlying event
public Object evaluate(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext,
ExprSubselectRowNode parent) {
if (matchingEvents.size() > 1) {
log.warn(parent.getMultirowMessage());
return null;
}
return EventBeanUtility.getNonemptyFirstEventUnderlying(matchingEvents);
}
// No filter and no select-clause: return matching events
public Collection<EventBean> evaluateGetCollEvents(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext context, ExprSubselectRowNode parent) {
return matchingEvents;
}
// No filter and no select-clause: no value can be determined
public Collection evaluateGetCollScalar(EventBean[] eventsPerStream, boolean isNewData, Collection<EventBean> matchingEvents, ExprEvaluatorContext context, ExprSubselectRowNode parent) {
return null;
}
// No filter and no select-clause: no value can be determined
public Object[] typableEvaluate(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext, ExprSubselectRowNode parent) {
return null;
}
public Object[][] typableEvaluateMultirow(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext, ExprSubselectRowNode parent) {
return null;
}
public EventBean evaluateGetEventBean(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext, ExprSubselectRowNode exprSubselectRowNode) {
return null; // this actually only applies to when there is a select-clause
}
}
private static class SubqueryEvalStrategyUnfilteredSelectedGroupedAgg extends SubqueryEvalStrategyUnfilteredSelected {
public Object evaluate(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext, ExprSubselectRowNode parent) {
Collection<Object> groupKeys = parent.getSubselectAggregationService().getGroupKeys(exprEvaluatorContext);
if (groupKeys.isEmpty() || groupKeys.size() > 1) {
return null;
}
parent.getSubselectAggregationService().setCurrentAccess(groupKeys.iterator().next(), exprEvaluatorContext.getAgentInstanceId());
return super.evaluate(eventsPerStream, newData, matchingEvents, exprEvaluatorContext, parent);
}
public Collection evaluateGetCollScalar(EventBean[] eventsPerStream, boolean isNewData, Collection<EventBean> matchingEvents, ExprEvaluatorContext context, ExprSubselectRowNode parent) {
return null;
}
public EventBean evaluateGetEventBean(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext context, ExprSubselectRowNode parent) {
return null;
}
public Collection<EventBean> evaluateGetCollEvents(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext context, ExprSubselectRowNode parent) {
Collection<Object> groupKeys = parent.getSubselectAggregationService().getGroupKeys(context);
if (groupKeys.isEmpty()) {
return null;
}
Collection<EventBean> events = new ArrayDeque<EventBean>(groupKeys.size());
for (Object groupKey : groupKeys) {
parent.getSubselectAggregationService().setCurrentAccess(groupKey, context.getAgentInstanceId());
Map<String, Object> row = parent.evaluateRow(null, true, context);
EventBean event = parent.subselectMultirowType.getEventAdapterService().adapterForTypedMap(row, parent.subselectMultirowType.getEventType());
events.add(event);
}
return events;
}
}
private static class SubqueryEvalStrategyUnfilteredSelected implements SubqueryEvalStrategy {
// No filter and with select clause
public Object evaluate(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext,
ExprSubselectRowNode parent) {
if (matchingEvents.size() > 1) {
log.warn(parent.getMultirowMessage());
return null;
}
EventBean[] events = EventBeanUtility.allocatePerStreamShift(eventsPerStream);
events[0] = EventBeanUtility.getNonemptyFirstEvent(matchingEvents);
Object result;
if (parent.selectClauseEvaluator.length == 1) {
result = parent.selectClauseEvaluator[0].evaluate(events, true, exprEvaluatorContext);
}
else {
// we are returning a Map here, not object-array, preferring the self-describing structure
result = parent.evaluateRow(events, true, exprEvaluatorContext);
}
return result;
}
// No filter and with select clause
public Collection<EventBean> evaluateGetCollEvents(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext context, ExprSubselectRowNode parent) {
if (matchingEvents.size() == 0) {
return Collections.emptyList();
}
// when selecting a single property in the select clause that provides a fragment
if (parent.subselectMultirowType == null) {
Collection<EventBean> events = new ArrayDeque<EventBean>(matchingEvents.size());
ExprIdentNodeEvaluator eval = (ExprIdentNodeEvaluator) parent.selectClauseEvaluator[0];
EventPropertyGetter getter = eval.getGetter();
for (EventBean subselectEvent : matchingEvents) {
Object fragment = getter.getFragment(subselectEvent);
if (fragment == null) {
continue;
}
events.add((EventBean) fragment);
}
return events;
}
// when selecting a combined output row that contains multiple fields
Collection<EventBean> events = new ArrayDeque<EventBean>(matchingEvents.size());
EventBean[] eventsPerStreamEval = EventBeanUtility.allocatePerStreamShift(eventsPerStream);
for (EventBean subselectEvent : matchingEvents) {
eventsPerStreamEval[0] = subselectEvent;
Map<String, Object> row = parent.evaluateRow(eventsPerStreamEval, true, context);
EventBean event = parent.subselectMultirowType.getEventAdapterService().adapterForTypedMap(row, parent.subselectMultirowType.getEventType());
events.add(event);
}
return events;
}
// No filter and with select clause
public Collection evaluateGetCollScalar(EventBean[] eventsPerStream, boolean isNewData, Collection<EventBean> matchingEvents, ExprEvaluatorContext context, ExprSubselectRowNode parent) {
List<Object> result = new ArrayList<Object>();
EventBean[] events = EventBeanUtility.allocatePerStreamShift(eventsPerStream);
for (EventBean subselectEvent : matchingEvents) {
events[0] = subselectEvent;
result.add(parent.selectClauseEvaluator[0].evaluate(events, isNewData, context));
}
return result;
}
// No filter and with select clause
public Object[] typableEvaluate(EventBean[] eventsPerStream, boolean isNewData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext, ExprSubselectRowNode parent) {
// take the first match only
EventBean[] events = EventBeanUtility.allocatePerStreamShift(eventsPerStream);
events[0] = EventBeanUtility.getNonemptyFirstEvent(matchingEvents);
Object[] results = new Object[parent.selectClauseEvaluator.length];
for (int i = 0; i < results.length; i++) {
results[i] = parent.selectClauseEvaluator[i].evaluate(events, isNewData, exprEvaluatorContext);
}
return results;
}
// No filter and with select clause
public Object[][] typableEvaluateMultirow(EventBean[] eventsPerStream, boolean isNewData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext, ExprSubselectRowNode parent) {
Object[][] rows = new Object[matchingEvents.size()][];
int index = -1;
EventBean[] events = EventBeanUtility.allocatePerStreamShift(eventsPerStream);
for (EventBean matchingEvent : matchingEvents) {
index++;
events[0] = matchingEvent;
Object[] results = new Object[parent.selectClauseEvaluator.length];
for (int i = 0; i < results.length; i++) {
results[i] = parent.selectClauseEvaluator[i].evaluate(events, isNewData, exprEvaluatorContext);
}
rows[index] = results;
}
return rows;
}
// No filter and with select clause
public EventBean evaluateGetEventBean(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext context, ExprSubselectRowNode parent) {
EventBean[] events = EventBeanUtility.allocatePerStreamShift(eventsPerStream);
events[0] = EventBeanUtility.getNonemptyFirstEvent(matchingEvents);
Map<String, Object> row = parent.evaluateRow(events, true, context);
return parent.subselectMultirowType.getEventAdapterService().adapterForTypedMap(row, parent.subselectMultirowType.getEventType());
}
}
private static class SubqueryEvalStrategyFilteredUnselected implements SubqueryEvalStrategy {
// Filter and no-select
public Object evaluate(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext, ExprSubselectRowNode parent) {
EventBean[] eventsZeroBased = EventBeanUtility.allocatePerStreamShift(eventsPerStream);
EventBean subSelectResult = ExprSubselectRowNodeUtility.evaluateFilterExpectSingleMatch(eventsZeroBased, newData, matchingEvents, exprEvaluatorContext, parent);
if (subSelectResult == null) {
return null;
}
return subSelectResult.getUnderlying();
}
// Filter and no-select
public Collection<EventBean> evaluateGetCollEvents(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext context, ExprSubselectRowNode parent) {
EventBean[] events = EventBeanUtility.allocatePerStreamShift(eventsPerStream);
ArrayDeque<EventBean> filtered = new ArrayDeque<EventBean>();
for (EventBean subselectEvent : matchingEvents) {
events[0] = subselectEvent;
Boolean pass = (Boolean) parent.filterExpr.evaluate(events, true, context);
if ((pass != null) && (pass)) {
filtered.add(subselectEvent);
}
}
return filtered;
}
// Filter and no-select
public Collection evaluateGetCollScalar(EventBean[] eventsPerStream, boolean isNewData, Collection<EventBean> matchingEvents, ExprEvaluatorContext context, ExprSubselectRowNode parent) {
return null;
}
// Filter and no-select
public Object[] typableEvaluate(EventBean[] eventsPerStream, boolean isNewData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext, ExprSubselectRowNode parent) {
return null;
}
// Filer and no-select
public Object[][] typableEvaluateMultirow(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext, ExprSubselectRowNode parent) {
return null;
}
// Filter and no-select
public EventBean evaluateGetEventBean(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext context, ExprSubselectRowNode parent) {
return null;
}
}
private static class SubqueryEvalStrategyFilteredSelected implements SubqueryEvalStrategy {
// Filter and Select
public Object evaluate(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext, ExprSubselectRowNode parent) {
EventBean[] eventsZeroBased = EventBeanUtility.allocatePerStreamShift(eventsPerStream);
EventBean subSelectResult = ExprSubselectRowNodeUtility.evaluateFilterExpectSingleMatch(eventsZeroBased, newData, matchingEvents, exprEvaluatorContext, parent);
if (subSelectResult == null) {
return null;
}
eventsZeroBased[0] = subSelectResult;
Object result;
if (parent.selectClauseEvaluator.length == 1) {
result = parent.selectClauseEvaluator[0].evaluate(eventsZeroBased, true, exprEvaluatorContext);
}
else {
// we are returning a Map here, not object-array, preferring the self-describing structure
result = parent.evaluateRow(eventsZeroBased, true, exprEvaluatorContext);
}
return result;
}
// Filter and Select
public Collection<EventBean> evaluateGetCollEvents(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext context, ExprSubselectRowNode parent) {
return null;
}
// Filter and Select
public Collection evaluateGetCollScalar(EventBean[] eventsPerStream, boolean isNewData, Collection<EventBean> matchingEvents, ExprEvaluatorContext context, ExprSubselectRowNode parent) {
List<Object> result = new ArrayList<Object>();
EventBean[] events = EventBeanUtility.allocatePerStreamShift(eventsPerStream);
for (EventBean subselectEvent : matchingEvents) {
events[0] = subselectEvent;
Boolean pass = (Boolean) parent.filterExpr.evaluate(events, true, context);
if ((pass != null) && (pass)) {
result.add(parent.selectClauseEvaluator[0].evaluate(events, isNewData, context));
}
}
return result;
}
// Filter and Select
public Object[] typableEvaluate(EventBean[] eventsPerStream, boolean isNewData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext, ExprSubselectRowNode parent) {
EventBean[] events = EventBeanUtility.allocatePerStreamShift(eventsPerStream);
EventBean subSelectResult = ExprSubselectRowNodeUtility.evaluateFilterExpectSingleMatch(events, isNewData, matchingEvents, exprEvaluatorContext, parent);
if (subSelectResult == null) {
return null;
}
events[0] = subSelectResult;
Object[] results = new Object[parent.selectClauseEvaluator.length];
for (int i = 0; i < results.length; i++) {
results[i] = parent.selectClauseEvaluator[i].evaluate(events, isNewData, exprEvaluatorContext);
}
return results;
}
public Object[][] typableEvaluateMultirow(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext, ExprSubselectRowNode parent) {
Object[][] rows = new Object[matchingEvents.size()][];
int index = -1;
EventBean[] events = EventBeanUtility.allocatePerStreamShift(eventsPerStream);
for (EventBean matchingEvent : matchingEvents) {
events[0] = matchingEvent;
Boolean pass = (Boolean) parent.filterExpr.evaluate(events, newData, exprEvaluatorContext);
if ((pass != null) && (pass)) {
index++;
Object[] results = new Object[parent.selectClauseEvaluator.length];
for (int i = 0; i < results.length; i++) {
results[i] = parent.selectClauseEvaluator[i].evaluate(events, newData, exprEvaluatorContext);
}
rows[index] = results;
}
}
if (index == rows.length - 1) {
return rows;
}
if (index == -1) {
return new Object[0][];
}
Object[][] rowArray = new Object[index + 1][];
System.arraycopy(rows, 0, rowArray, 0, rowArray.length);
return rowArray;
}
// Filter and Select
public EventBean evaluateGetEventBean(EventBean[] eventsPerStream, boolean isNewData, Collection<EventBean> matchingEvents, ExprEvaluatorContext context, ExprSubselectRowNode parent) {
EventBean[] events = EventBeanUtility.allocatePerStreamShift(eventsPerStream);
EventBean subSelectResult = ExprSubselectRowNodeUtility.evaluateFilterExpectSingleMatch(events, isNewData, matchingEvents, context, parent);
if (subSelectResult == null) {
return null;
}
Map<String, Object> row = parent.evaluateRow(events, true, context);
return parent.subselectMultirowType.getEventAdapterService().adapterForTypedMap(row, parent.subselectMultirowType.getEventType());
}
}
}