/*
***************************************************************************************
* Copyright (C) 2006 EsperTech, Inc. All rights reserved. *
* http://www.espertech.com/esper *
* 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.core.eval;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventType;
import com.espertech.esper.epl.core.SelectExprProcessor;
import com.espertech.esper.epl.expression.core.ExprEvaluator;
import com.espertech.esper.epl.expression.core.ExprEvaluatorContext;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
public abstract class EvalBaseMap extends EvalBase implements SelectExprProcessor {
protected EvalBaseMap(SelectExprContext selectExprContext, EventType resultEventType) {
super(selectExprContext, resultEventType);
}
public abstract EventBean processSpecific(Map<String, Object> props, EventBean[] eventsPerStream, boolean isNewData, boolean isSynthesize, ExprEvaluatorContext exprEvaluatorContext);
public EventBean process(EventBean[] eventsPerStream, boolean isNewData, boolean isSynthesize, ExprEvaluatorContext exprEvaluatorContext) {
ExprEvaluator[] expressionNodes = selectExprContext.getExpressionNodes();
String[] columnNames = selectExprContext.getColumnNames();
// Evaluate all expressions and build a map of name-value pairs
Map<String, Object> props;
if (expressionNodes.length == 0) {
props = Collections.EMPTY_MAP;
} else {
props = new HashMap<String, Object>();
for (int i = 0; i < expressionNodes.length; i++) {
Object evalResult = expressionNodes[i].evaluate(eventsPerStream, isNewData, exprEvaluatorContext);
props.put(columnNames[i], evalResult);
}
}
return processSpecific(props, eventsPerStream, isNewData, isSynthesize, exprEvaluatorContext);
}
}