/*
***************************************************************************************
* 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 com.espertech.esper.epl.spec.SelectClauseStreamCompiledSpec;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public abstract class EvalSelectStreamBaseMap extends EvalSelectStreamBase implements SelectExprProcessor {
protected EvalSelectStreamBaseMap(SelectExprContext selectExprContext, EventType resultEventType, List<SelectClauseStreamCompiledSpec> namedStreams, boolean usingWildcard) {
super(selectExprContext, resultEventType, namedStreams, usingWildcard);
}
public abstract EventBean processSpecific(Map<String, Object> props, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext);
public EventBean process(EventBean[] eventsPerStream, boolean isNewData, boolean isSynthesize, ExprEvaluatorContext exprEvaluatorContext) {
// Evaluate all expressions and build a map of name-value pairs
Map<String, Object> props = new HashMap<String, Object>();
int count = 0;
for (ExprEvaluator expressionNode : selectExprContext.getExpressionNodes()) {
Object evalResult = expressionNode.evaluate(eventsPerStream, isNewData, exprEvaluatorContext);
props.put(selectExprContext.getColumnNames()[count], evalResult);
count++;
}
for (SelectClauseStreamCompiledSpec element : namedStreams) {
EventBean theEvent = eventsPerStream[element.getStreamNumber()];
if (element.getTableMetadata() != null) {
if (theEvent != null) {
theEvent = element.getTableMetadata().getEventToPublic().convert(theEvent, eventsPerStream, isNewData, exprEvaluatorContext);
}
}
props.put(selectExprContext.getColumnNames()[count], theEvent);
count++;
}
if (isUsingWildcard && eventsPerStream.length > 1) {
for (EventBean anEventsPerStream : eventsPerStream) {
props.put(selectExprContext.getColumnNames()[count], anEventsPerStream);
count++;
}
}
return processSpecific(props, eventsPerStream, isNewData, exprEvaluatorContext);
}
}