/**************************************************************************************
* 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.plan;
import com.espertech.esper.client.EventType;
import com.espertech.esper.epl.expression.ExprEvaluator;
import com.espertech.esper.epl.join.exec.base.IndexedTableLookupStrategy;
import com.espertech.esper.epl.join.exec.base.IndexedTableLookupStrategyExpr;
import com.espertech.esper.epl.join.exec.base.JoinExecTableLookupStrategy;
import com.espertech.esper.epl.join.table.EventTable;
import com.espertech.esper.epl.join.table.PropertyIndexedEventTable;
import java.io.StringWriter;
import java.util.Collections;
import java.util.List;
import java.util.Map;
/**
* Plan to perform an indexed table lookup.
*/
public class IndexedTableLookupPlanMulti extends TableLookupPlan
{
private List<QueryGraphValueEntryHashKeyed> keyProperties;
/**
* Ctor.
* @param lookupStream - stream that generates event to look up for
* @param indexedStream - stream to index table lookup
* @param indexNum - index number for the table containing the full unindexed contents
* @param keyProperties - properties to use in lookup event to access index
*/
public IndexedTableLookupPlanMulti(int lookupStream, int indexedStream, String indexNum, List<QueryGraphValueEntryHashKeyed> keyProperties)
{
super(lookupStream, indexedStream, indexNum);
this.keyProperties = keyProperties;
}
public TableLookupKeyDesc getKeyDescriptor() {
return new TableLookupKeyDesc(keyProperties, Collections.<QueryGraphValueEntryRange>emptyList());
}
public JoinExecTableLookupStrategy makeStrategyInternal(EventTable eventTable, EventType[] eventTypes)
{
PropertyIndexedEventTable index = (PropertyIndexedEventTable) eventTable;
String[] keyProps = new String[keyProperties.size()];
ExprEvaluator[] evaluators = new ExprEvaluator[keyProperties.size()];
boolean isStrictlyProps = true;
for (int i = 0; i < keyProps.length; i++) {
isStrictlyProps = isStrictlyProps && keyProperties.get(i) instanceof QueryGraphValueEntryHashKeyedProp;
evaluators[i] = keyProperties.get(i).getKeyExpr().getExprEvaluator();
if (keyProperties.get(i) instanceof QueryGraphValueEntryHashKeyedProp) {
keyProps[i] = ((QueryGraphValueEntryHashKeyedProp) keyProperties.get(i)).getKeyProperty();
}
else {
isStrictlyProps = false;
}
}
if (isStrictlyProps) {
return new IndexedTableLookupStrategy(eventTypes[this.getLookupStream()], keyProps, index);
}
else {
return new IndexedTableLookupStrategyExpr(evaluators, getLookupStream(), index);
}
}
public String toString()
{
return this.getClass().getSimpleName() + " " +
super.toString() +
" keyProperties=" + QueryGraphValueEntryHashKeyed.toQueryPlan(keyProperties);
}
}