EnumEvalFirstOfNoPredicate.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.enummethod.eval;

import com.espertech.esper.client.EventBean;
import com.espertech.esper.epl.expression.ExprEvaluatorContext;

import java.util.Collection;

public class EnumEvalFirstOfNoPredicate extends EnumEvalBase implements EnumEval {

    public EnumEvalFirstOfNoPredicate(int streamCountIncoming) {
        super(streamCountIncoming);
    }

    public Object evaluateEnumMethod(EventBean[] eventsLambda, Collection target, boolean isNewData, ExprEvaluatorContext context) {
        if (target == null || target.isEmpty()) {
            return null;
        }
        return target.iterator().next();
    }
}