CompositeAccessStrategyLT.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.join.exec.composite;

import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventPropertyGetter;
import com.espertech.esper.epl.expression.ExprEvaluator;
import com.espertech.esper.epl.expression.ExprEvaluatorContext;
import com.espertech.esper.event.EventBeanUtility;

import java.util.Collection;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;

public class CompositeAccessStrategyLT extends CompositeAccessStrategyRelOpBase implements CompositeAccessStrategy {

    public CompositeAccessStrategyLT(boolean isNWOnTrigger, int lookupStream, int numStreams, ExprEvaluator key, Class coercionType) {
        super(isNWOnTrigger, lookupStream, numStreams, key, coercionType);
    }

    public Set<EventBean> lookup(EventBean theEvent, Map parent, Set<EventBean> result, CompositeIndexQuery next, ExprEvaluatorContext context) {
        TreeMap index = (TreeMap) parent;
        Object comparable = super.evaluateLookup(theEvent, context);
        if (comparable == null) {
            return null;
        }
        comparable = EventBeanUtility.coerce(comparable, coercionType);
        return CompositeIndexQueryRange.handle(theEvent, index.headMap(comparable), null, result, next);
    }

    public Collection<EventBean> lookup(EventBean[] eventsPerStream, Map parent, Collection<EventBean> result, CompositeIndexQuery next, ExprEvaluatorContext context) {
        TreeMap index = (TreeMap) parent;
        Object comparable = super.evaluatePerStream(eventsPerStream, context);
        if (comparable == null) {
            return null;
        }
        comparable = EventBeanUtility.coerce(comparable, coercionType);
        return CompositeIndexQueryRange.handle(eventsPerStream, index.headMap(comparable), null, result, next);
    }
}