/**************************************************************************************
* 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.expression.ExprNode;
import com.espertech.esper.epl.expression.ExprNodeUtility;
import com.espertech.esper.epl.join.exec.base.InKeywordSingleTableLookupStrategyExpr;
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 InKeywordTableLookupPlanSingleIdx extends TableLookupPlan
{
private ExprNode[] expressions;
/**
* 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
*/
public InKeywordTableLookupPlanSingleIdx(int lookupStream, int indexedStream, String indexNum, ExprNode[] expressions)
{
super(lookupStream, indexedStream, new String[] {indexNum});
this.expressions = expressions;
}
public ExprNode[] getExpressions() {
return expressions;
}
public TableLookupKeyDesc getKeyDescriptor() {
return new TableLookupKeyDesc(Collections.<QueryGraphValueEntryHashKeyed>emptyList(), Collections.<QueryGraphValueEntryRange>emptyList());
}
public JoinExecTableLookupStrategy makeStrategyInternal(EventTable[] eventTable, EventType[] eventTypes)
{
PropertyIndexedEventTableSingle single = (PropertyIndexedEventTableSingle) eventTable[0];
ExprEvaluator[] evaluators = new ExprEvaluator[expressions.length];
for (int i = 0; i < expressions.length; i++) {
evaluators[i] = expressions[i].getExprEvaluator();
}
return new InKeywordSingleTableLookupStrategyExpr(evaluators,
super.getLookupStream(), single, new LookupStrategyDesc(LookupStrategyType.INKEYWORDSINGLEIDX, ExprNodeUtility.toExpressionStringsMinPrecedence(expressions)));
}
public String toString()
{
return this.getClass().getSimpleName() + " " +
super.toString() +
" keyProperties=" + ExprNodeUtility.toExpressionStringMinPrecedence(expressions);
}
}