/**************************************************************************************
* 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.ExprNodeUtility;
import com.espertech.esper.epl.join.exec.base.IndexedTableLookupStrategySingle;
import com.espertech.esper.epl.join.exec.base.IndexedTableLookupStrategySingleExpr;
import com.espertech.esper.epl.join.exec.base.JoinExecTableLookupStrategy;
import com.espertech.esper.epl.join.table.EventTable;
import com.espertech.esper.epl.join.table.PropertyIndexedEventTableSingle;
import com.espertech.esper.epl.lookup.LookupStrategyDesc;
import com.espertech.esper.epl.lookup.LookupStrategyType;
import java.util.Collections;
/**
* Plan to perform an indexed table lookup.
*/
public class IndexedTableLookupPlanSingle extends TableLookupPlan
{
private QueryGraphValueEntryHashKeyed hashKey;
/**
* 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 hashKey - properties to use in lookup event to access index
*/
public IndexedTableLookupPlanSingle(int lookupStream, int indexedStream, String indexNum, QueryGraphValueEntryHashKeyed hashKey)
{
super(lookupStream, indexedStream, new String[] {indexNum});
this.hashKey = hashKey;
}
public TableLookupKeyDesc getKeyDescriptor() {
return new TableLookupKeyDesc(Collections.singletonList(hashKey), Collections.<QueryGraphValueEntryRange>emptyList());
}
public JoinExecTableLookupStrategy makeStrategyInternal(EventTable[] eventTable, EventType[] eventTypes)
{
PropertyIndexedEventTableSingle index = (PropertyIndexedEventTableSingle) eventTable[0];
if (hashKey instanceof QueryGraphValueEntryHashKeyedExpr) {
QueryGraphValueEntryHashKeyedExpr expr = (QueryGraphValueEntryHashKeyedExpr) hashKey;
return new IndexedTableLookupStrategySingleExpr(expr.getKeyExpr(), super.getLookupStream(), index,
new LookupStrategyDesc(LookupStrategyType.SINGLEEXPR, new String[] {ExprNodeUtility.toExpressionStringMinPrecedence(expr.getKeyExpr())}));
}
else if (hashKey instanceof QueryGraphValueEntryHashKeyedProp) {
QueryGraphValueEntryHashKeyedProp prop = (QueryGraphValueEntryHashKeyedProp) hashKey;
return new IndexedTableLookupStrategySingle(eventTypes[this.getLookupStream()], prop.getKeyProperty(), index);
}
else {
throw new IllegalArgumentException("Invalid hashkey instance " + hashKey);
}
}
public QueryGraphValueEntryHashKeyed getHashKey() {
return hashKey;
}
public String toString()
{
return "IndexedTableLookupPlan " +
super.toString() +
" keyProperty=" + getKeyDescriptor();
}
}