ResultSetProcessorFactory.java

/**************************************************************************************
 * 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.core;

import com.espertech.esper.client.EventType;
import com.espertech.esper.core.context.util.AgentInstanceContext;
import com.espertech.esper.epl.agg.service.AggregationService;

/**
 * Processor prototype for result sets for instances that apply the select-clause, group-by-clause and having-clauses
 * as supplied.
 */
public interface ResultSetProcessorFactory
{
    /**
     * Returns the event type of processed results.
     * @return event type of the resulting events posted by the processor.
     */
    public EventType getResultEventType();

    public boolean hasAggregation();

    public ResultSetProcessor instantiate(OrderByProcessor orderByProcessor, AggregationService aggregationService, AgentInstanceContext agentInstanceContext);
}