/*
 ***************************************************************************************
 *  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.view.internal;

import com.espertech.esper.client.EventBean;
import com.espertech.esper.core.context.util.AgentInstanceContext;
import com.espertech.esper.core.service.EPStatementHandle;
import com.espertech.esper.core.service.InternalEventRouter;
import com.espertech.esper.core.start.EPStatementStartMethodOnTriggerItem;
import com.espertech.esper.epl.core.ResultSetProcessor;
import com.espertech.esper.epl.expression.core.ExprEvaluator;
import com.espertech.esper.epl.expression.core.ExprEvaluatorContext;
import com.espertech.esper.epl.table.mgmt.TableStateInstance;
import com.espertech.esper.metrics.instrumentation.InstrumentationHelper;

/**
 * Handler for split-stream evaluating the first where-clause matching select-clause.
 */
public class RouteResultViewHandlerFirst extends RouteResultViewHandlerBase {
    public RouteResultViewHandlerFirst(EPStatementHandle epStatementHandle, InternalEventRouter internalEventRouter, TableStateInstance[] tableStateInstances, EPStatementStartMethodOnTriggerItem[] items, ResultSetProcessor[] processors, ExprEvaluator[] whereClauses, AgentInstanceContext agentInstanceContext) {
        super(epStatementHandle, internalEventRouter, tableStateInstances, items, processors, whereClauses, agentInstanceContext);
    }

    public boolean handle(EventBean theEvent, ExprEvaluatorContext exprEvaluatorContext) {
        if (InstrumentationHelper.ENABLED) {
            InstrumentationHelper.get().qSplitStream(false, theEvent, whereClauses);
        }

        int index = -1;

        for (int i = 0; i < whereClauses.length; i++) {
            EPStatementStartMethodOnTriggerItem item = items[i];
            eventsPerStream[0] = theEvent;

            // handle no contained-event evaluation
            if (item.getPropertyEvaluator() == null) {
                boolean pass = checkWhereClauseCurrentEvent(i, exprEvaluatorContext);
                if (pass) {
                    index = i;
                    break;
                }
            } else {
                // need to get contained events first
                EventBean[] containeds = items[i].getPropertyEvaluator().getProperty(eventsPerStream[0], exprEvaluatorContext);
                if (containeds == null || containeds.length == 0) {
                    continue;
                }

                for (EventBean contained : containeds) {
                    eventsPerStream[0] = contained;
                    boolean pass = checkWhereClauseCurrentEvent(i, exprEvaluatorContext);
                    if (pass) {
                        index = i;
                        break;
                    }
                }

                if (index != -1) {
                    break;
                }
            }
        }

        if (index != -1) {
            mayRouteCurrentEvent(index, exprEvaluatorContext);
        }

        if (InstrumentationHelper.ENABLED) {
            InstrumentationHelper.get().aSplitStream(false, index != -1);
        }
        return index != -1;
    }
}