/**************************************************************************************
* 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.core.start;
import com.espertech.esper.client.EPStatementException;
import com.espertech.esper.client.EventType;
import com.espertech.esper.collection.UniformPair;
import com.espertech.esper.core.service.ExprEvaluatorContextStatement;
import com.espertech.esper.core.service.StatementContext;
import com.espertech.esper.epl.core.MethodResolutionService;
import com.espertech.esper.epl.core.StreamTypeService;
import com.espertech.esper.epl.core.StreamTypeServiceImpl;
import com.espertech.esper.epl.core.ViewResourceDelegateUnverified;
import com.espertech.esper.epl.expression.*;
import com.espertech.esper.epl.named.NamedWindowService;
import com.espertech.esper.epl.spec.OnTriggerSetAssignment;
import com.espertech.esper.epl.spec.OuterJoinDesc;
import com.espertech.esper.epl.spec.StatementSpecCompiled;
import com.espertech.esper.epl.view.OutputConditionExpressionFactory;
import com.espertech.esper.util.JavaClassHelper;
import com.espertech.esper.view.DataWindowViewFactory;
import com.espertech.esper.view.ViewFactory;
import com.espertech.esper.view.std.GroupByViewFactory;
import com.espertech.esper.view.std.MergeViewFactory;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
public class EPStatementStartMethodHelperValidate
{
private static final Log log = LogFactory.getLog(EPStatementStartMethodHelperValidate.class);
public static void validateNoDataWindowOnNamedWindow(List<ViewFactory> viewFactories) throws ExprValidationException {
for (ViewFactory viewFactory : viewFactories)
{
if ((viewFactory instanceof GroupByViewFactory) || ((viewFactory instanceof MergeViewFactory)))
{
continue;
}
if (viewFactory instanceof DataWindowViewFactory)
{
throw new ExprValidationException(NamedWindowService.ERROR_MSG_NO_DATAWINDOW_ALLOWED);
}
}
}
/**
* Validate filter and join expression nodes.
* @param statementSpec the compiled statement
* @param statementContext the statement services
* @param typeService the event types for streams
* @param viewResourceDelegate the delegate to verify expressions that use view resources
*/
protected static void validateNodes(StatementSpecCompiled statementSpec,
StatementContext statementContext,
StreamTypeService typeService,
ViewResourceDelegateUnverified viewResourceDelegate)
{
MethodResolutionService methodResolutionService = statementContext.getMethodResolutionService();
ExprEvaluatorContextStatement evaluatorContextStmt = new ExprEvaluatorContextStatement(statementContext);
if (statementSpec.getFilterRootNode() != null)
{
ExprNode optionalFilterNode = statementSpec.getFilterRootNode();
// Validate where clause, initializing nodes to the stream ids used
try
{
ExprValidationContext validationContext = new ExprValidationContext(typeService, methodResolutionService, viewResourceDelegate, statementContext.getSchedulingService(), statementContext.getVariableService(), evaluatorContextStmt, statementContext.getEventAdapterService(), statementContext.getStatementName(), statementContext.getStatementId(), statementContext.getAnnotations(), statementContext.getContextDescriptor());
optionalFilterNode = ExprNodeUtility.getValidatedSubtree(optionalFilterNode, validationContext);
if (optionalFilterNode.getExprEvaluator().getType() != boolean.class && optionalFilterNode.getExprEvaluator().getType() != Boolean.class) {
throw new ExprValidationException("The where-clause filter expression must return a boolean value");
}
statementSpec.setFilterExprRootNode(optionalFilterNode);
// Make sure there is no aggregation in the where clause
List<ExprAggregateNode> aggregateNodes = new LinkedList<ExprAggregateNode>();
ExprAggregateNodeUtil.getAggregatesBottomUp(optionalFilterNode, aggregateNodes);
if (!aggregateNodes.isEmpty())
{
throw new ExprValidationException("An aggregate function may not appear in a WHERE clause (use the HAVING clause)");
}
}
catch (ExprValidationException ex)
{
log.debug(".validateNodes Validation exception for filter=" + optionalFilterNode.toExpressionString(), ex);
throw new EPStatementException("Error validating expression: " + ex.getMessage(), statementContext.getExpression());
}
}
if ((statementSpec.getOutputLimitSpec() != null) && (statementSpec.getOutputLimitSpec().getWhenExpressionNode() != null))
{
ExprNode outputLimitWhenNode = statementSpec.getOutputLimitSpec().getWhenExpressionNode();
// Validate where clause, initializing nodes to the stream ids used
try
{
EventType outputLimitType = OutputConditionExpressionFactory.getBuiltInEventType(statementContext.getEventAdapterService());
StreamTypeService typeServiceOutputWhen = new StreamTypeServiceImpl(new EventType[] {outputLimitType}, new String[]{null}, new boolean[] {true}, statementContext.getEngineURI(), false);
ExprValidationContext validationContext = new ExprValidationContext(typeServiceOutputWhen, methodResolutionService, null, statementContext.getSchedulingService(), statementContext.getVariableService(), evaluatorContextStmt, statementContext.getEventAdapterService(), statementContext.getStatementName(), statementContext.getStatementId(), statementContext.getAnnotations(), statementContext.getContextDescriptor());
outputLimitWhenNode = ExprNodeUtility.getValidatedSubtree(outputLimitWhenNode, validationContext);
statementSpec.getOutputLimitSpec().setWhenExpressionNode(outputLimitWhenNode);
if (JavaClassHelper.getBoxedType(outputLimitWhenNode.getExprEvaluator().getType()) != Boolean.class)
{
throw new ExprValidationException("The when-trigger expression in the OUTPUT WHEN clause must return a boolean-type value");
}
EPStatementStartMethodHelperValidate.validateNoAggregations(outputLimitWhenNode, "An aggregate function may not appear in a OUTPUT LIMIT clause");
if (statementSpec.getOutputLimitSpec().getThenExpressions() != null)
{
for (OnTriggerSetAssignment assign : statementSpec.getOutputLimitSpec().getThenExpressions())
{
ExprNode node = ExprNodeUtility.getValidatedSubtree(assign.getExpression(), validationContext);
assign.setExpression(node);
EPStatementStartMethodHelperValidate.validateNoAggregations(node, "An aggregate function may not appear in a OUTPUT LIMIT clause");
}
}
}
catch (ExprValidationException ex)
{
throw new EPStatementException("Error validating expression: " + ex.getMessage(), statementContext.getExpression());
}
}
for (int outerJoinCount = 0; outerJoinCount < statementSpec.getOuterJoinDescList().size(); outerJoinCount++)
{
OuterJoinDesc outerJoinDesc = statementSpec.getOuterJoinDescList().get(outerJoinCount);
UniformPair<Integer> streamIdPair = validateOuterJoinPropertyPair(statementContext, outerJoinDesc.getLeftNode(), outerJoinDesc.getRightNode(), outerJoinCount,
typeService, viewResourceDelegate);
if (outerJoinDesc.getAdditionalLeftNodes() != null)
{
Set<Integer> streamSet = new HashSet<Integer>();
streamSet.add(streamIdPair.getFirst());
streamSet.add(streamIdPair.getSecond());
for (int i = 0; i < outerJoinDesc.getAdditionalLeftNodes().length; i++)
{
UniformPair<Integer> streamIdPairAdd = validateOuterJoinPropertyPair(statementContext, outerJoinDesc.getAdditionalLeftNodes()[i], outerJoinDesc.getAdditionalRightNodes()[i], outerJoinCount,
typeService, viewResourceDelegate);
// make sure all additional properties point to the same two streams
if ((!streamSet.contains(streamIdPairAdd.getFirst()) || (!streamSet.contains(streamIdPairAdd.getSecond()))))
{
String message = "Outer join ON-clause columns must refer to properties of the same joined streams" +
" when using multiple columns in the on-clause";
throw new EPStatementException("Error validating expression: " + message, statementContext.getExpression());
}
}
}
}
}
protected static UniformPair<Integer> validateOuterJoinPropertyPair(
StatementContext statementContext,
ExprIdentNode leftNode,
ExprIdentNode rightNode,
int outerJoinCount,
StreamTypeService typeService,
ViewResourceDelegateUnverified viewResourceDelegate)
{
// Validate the outer join clause using an artificial equals-node on top.
// Thus types are checked via equals.
// Sets stream ids used for validated nodes.
ExprNode equalsNode = new ExprEqualsNodeImpl(false, false);
equalsNode.addChildNode(leftNode);
equalsNode.addChildNode(rightNode);
ExprEvaluatorContextStatement evaluatorContextStmt = new ExprEvaluatorContextStatement(statementContext);
try
{
ExprValidationContext validationContext = new ExprValidationContext(typeService, statementContext.getMethodResolutionService(), viewResourceDelegate, statementContext.getSchedulingService(), statementContext.getVariableService(), evaluatorContextStmt, statementContext.getEventAdapterService(), statementContext.getStatementName(), statementContext.getStatementId(), statementContext.getAnnotations(), statementContext.getContextDescriptor());
ExprNodeUtility.getValidatedSubtree(equalsNode, validationContext);
}
catch (ExprValidationException ex)
{
log.debug("Validation exception for outer join node=" + equalsNode.toExpressionString(), ex);
throw new EPStatementException("Error validating expression: " + ex.getMessage(), statementContext.getExpression());
}
// Make sure we have left-hand-side and right-hand-side refering to different streams
int streamIdLeft = leftNode.getStreamId();
int streamIdRight = rightNode.getStreamId();
if (streamIdLeft == streamIdRight)
{
String message = "Outer join ON-clause cannot refer to properties of the same stream";
throw new EPStatementException("Error validating expression: " + message, statementContext.getExpression());
}
// Make sure one of the properties refers to the acutual stream currently being joined
int expectedStreamJoined = outerJoinCount + 1;
if ((streamIdLeft != expectedStreamJoined) && (streamIdRight != expectedStreamJoined))
{
String message = "Outer join ON-clause must refer to at least one property of the joined stream" +
" for stream " + expectedStreamJoined;
throw new EPStatementException("Error validating expression: " + message, statementContext.getExpression());
}
// Make sure neither of the streams refer to a 'future' stream
String badPropertyName = null;
if (streamIdLeft > outerJoinCount + 1)
{
badPropertyName = leftNode.getResolvedPropertyName();
}
if (streamIdRight > outerJoinCount + 1)
{
badPropertyName = rightNode.getResolvedPropertyName();
}
if (badPropertyName != null)
{
String message = "Outer join ON-clause invalid scope for property" +
" '" + badPropertyName + "', expecting the current or a prior stream scope";
throw new EPStatementException("Error validating expression: " + message, statementContext.getExpression());
}
return new UniformPair<Integer>(streamIdLeft, streamIdRight);
}
protected static ExprNode validateExprNoAgg(ExprNode exprNode, StreamTypeService streamTypeService, StatementContext statementContext, ExprEvaluatorContext exprEvaluatorContext, String errorMsg) throws ExprValidationException {
ExprValidationContext validationContext = new ExprValidationContext(streamTypeService, statementContext.getMethodResolutionService(), null, statementContext.getSchedulingService(), statementContext.getVariableService(), exprEvaluatorContext, statementContext.getEventAdapterService(), statementContext.getStatementName(), statementContext.getStatementId(), statementContext.getAnnotations(), statementContext.getContextDescriptor());
ExprNode validated = ExprNodeUtility.getValidatedSubtree(exprNode, validationContext);
validateNoAggregations(validated, errorMsg);
return validated;
}
protected static void validateNoAggregations(ExprNode exprNode, String errorMsg)
throws ExprValidationException
{
// Make sure there is no aggregation in the where clause
List<ExprAggregateNode> aggregateNodes = new LinkedList<ExprAggregateNode>();
ExprAggregateNodeUtil.getAggregatesBottomUp(exprNode, aggregateNodes);
if (!aggregateNodes.isEmpty())
{
throw new ExprValidationException(errorMsg);
}
}
// Special-case validation: When an on-merge query in the not-matched clause uses a subquery then
// that subquery should not reference any of the stream's properties which are not-matched
protected static void validateSubqueryExcludeOuterStream(ExprNode matchCondition) throws ExprValidationException {
ExprNodeSubselectVisitor visitorSubselects = new ExprNodeSubselectVisitor();
matchCondition.accept(visitorSubselects);
if (visitorSubselects.getSubselects().isEmpty()) {
return;
}
ExprNodeIdentifierCollectVisitor visitorProps = new ExprNodeIdentifierCollectVisitor();
for (ExprSubselectNode node : visitorSubselects.getSubselects()) {
if (node.getStatementSpecCompiled().getFilterRootNode() != null) {
node.getStatementSpecCompiled().getFilterRootNode().accept(visitorProps);
}
}
for (ExprIdentNode node : visitorProps.getExprProperties()) {
if (node.getStreamId() == 1) {
throw new ExprValidationException("On-Merge not-matched filter expression may not use properties that are provided by the named window event");
}
}
}
}