/*
* *************************************************************************************
* 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.join.base;
import com.espertech.esper.client.EventType;
import com.espertech.esper.collection.Pair;
import com.espertech.esper.core.context.util.AgentInstanceContext;
import com.espertech.esper.epl.expression.ExprEvaluator;
import com.espertech.esper.epl.expression.ExprEvaluatorContext;
import com.espertech.esper.epl.expression.ExprNode;
import com.espertech.esper.epl.join.pollindex.PollResultIndexingStrategy;
import com.espertech.esper.epl.join.pollindex.PollResultIndexingStrategyNoIndex;
import com.espertech.esper.epl.spec.OuterJoinDesc;
import com.espertech.esper.type.OuterJoinType;
import com.espertech.esper.view.HistoricalEventViewable;
import com.espertech.esper.view.Viewable;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class JoinSetComposerPrototypeHistorical2StreamImpl implements JoinSetComposerPrototype {
private static final Log log = LogFactory.getLog(JoinSetComposerPrototypeFactory.class);
private final ExprNode optionalFilterNode;
private final EventType[] streamTypes;
private final ExprEvaluatorContext exprEvaluatorContext;
private final int polledViewNum;
private final int streamViewNum;
private final boolean isOuterJoin;
private final ExprNode outerJoinEqualsNode;
private final Pair<HistoricalIndexLookupStrategy, PollResultIndexingStrategy> indexStrategies;
private final boolean isAllHistoricalNoSubordinate;
private final OuterJoinDesc[] outerJoinDescList;
public JoinSetComposerPrototypeHistorical2StreamImpl(ExprNode optionalFilterNode, EventType[] streamTypes, ExprEvaluatorContext exprEvaluatorContext, int polledViewNum, int streamViewNum, boolean outerJoin, ExprNode outerJoinEqualsNode, Pair<HistoricalIndexLookupStrategy, PollResultIndexingStrategy> indexStrategies, boolean allHistoricalNoSubordinate, OuterJoinDesc[] outerJoinDescList) {
this.optionalFilterNode = optionalFilterNode;
this.streamTypes = streamTypes;
this.exprEvaluatorContext = exprEvaluatorContext;
this.polledViewNum = polledViewNum;
this.streamViewNum = streamViewNum;
isOuterJoin = outerJoin;
this.outerJoinEqualsNode = outerJoinEqualsNode;
this.indexStrategies = indexStrategies;
isAllHistoricalNoSubordinate = allHistoricalNoSubordinate;
this.outerJoinDescList = outerJoinDescList;
}
public JoinSetComposerDesc create(Viewable[] streamViews, boolean isFireAndForget, AgentInstanceContext agentInstanceContext) {
QueryStrategy[] queryStrategies = new QueryStrategy[streamTypes.length];
HistoricalEventViewable viewable = (HistoricalEventViewable) streamViews[polledViewNum];
ExprEvaluator outerJoinEqualsNodeEval = outerJoinEqualsNode == null ? null : outerJoinEqualsNode.getExprEvaluator();
queryStrategies[streamViewNum] = new HistoricalDataQueryStrategy(streamViewNum, polledViewNum, viewable, isOuterJoin, outerJoinEqualsNodeEval,
indexStrategies.getFirst(), indexStrategies.getSecond());
// for strictly historical joins, create a query strategy for the non-subordinate historical view
if (isAllHistoricalNoSubordinate)
{
boolean isOuterJoin = false;
if (outerJoinDescList.length > 0)
{
OuterJoinDesc outerJoinDesc = outerJoinDescList[0];
if (outerJoinDesc.getOuterJoinType().equals(OuterJoinType.FULL))
{
isOuterJoin = true;
}
else if ((outerJoinDesc.getOuterJoinType().equals(OuterJoinType.LEFT)) &&
(polledViewNum == 0))
{
isOuterJoin = true;
}
else if ((outerJoinDesc.getOuterJoinType().equals(OuterJoinType.RIGHT)) &&
(polledViewNum == 1))
{
isOuterJoin = true;
}
}
viewable = (HistoricalEventViewable) streamViews[streamViewNum];
queryStrategies[polledViewNum] = new HistoricalDataQueryStrategy(polledViewNum, streamViewNum, viewable, isOuterJoin, outerJoinEqualsNodeEval,
new HistoricalIndexLookupStrategyNoIndex(), new PollResultIndexingStrategyNoIndex());
}
JoinSetComposer composer = new JoinSetComposerHistoricalImpl(null, queryStrategies, streamViews, exprEvaluatorContext);
ExprEvaluator postJoinEval = optionalFilterNode == null ? null : optionalFilterNode.getExprEvaluator();
return new JoinSetComposerDesc(composer, postJoinEval);
}
}