com.espertech.esper.view.internal.RouteResultView Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of esper Show documentation
Complex event processing and event series analysis component
There is a newer version: 7.1.0
/*
 * *************************************************************************************
 *  Copyright (C) 2006-2015 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.client.EventType;
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.epl.core.ResultSetProcessor;
import com.espertech.esper.epl.expression.core.ExprEvaluatorContext;
import com.espertech.esper.epl.expression.core.ExprNode;
import com.espertech.esper.epl.expression.core.ExprNodeUtility;
import com.espertech.esper.epl.table.mgmt.TableStateInstance;
import com.espertech.esper.util.CollectionUtil;
import com.espertech.esper.view.ViewSupport;

import java.util.Iterator;

/**
 * View for processing split-stream syntax.
 */
public class RouteResultView extends ViewSupport
{
    private final EventType eventType;
    private RouteResultViewHandler handler;
    private ExprEvaluatorContext exprEvaluatorContext;

    /**
     * Ctor.
     * @param isFirst true for the first-where clause, false for all where-clauses
     * @param eventType output type
     * @param epStatementHandle handle
     * @param processors processors for select clauses
     * @param whereClauses where expressions
     * @param agentInstanceContext agent instance context
     */
    public RouteResultView(boolean isFirst,
                           EventType eventType,
                           EPStatementHandle epStatementHandle,
                           InternalEventRouter internalEventRouter,
                           TableStateInstance[] tableStateInstances,
                           boolean[] isNamedWindowInsert,
                           ResultSetProcessor[] processors,
                           ExprNode[] whereClauses,
                           AgentInstanceContext agentInstanceContext)
    {
        if (whereClauses.length != processors.length)
        {
            throw new IllegalArgumentException("Number of where-clauses and processors does not match");
        }

        this.exprEvaluatorContext = agentInstanceContext;
        this.eventType = eventType;
        if (isFirst)
        {
            handler = new RouteResultViewHandlerFirst(epStatementHandle, internalEventRouter, tableStateInstances, isNamedWindowInsert, processors, ExprNodeUtility.getEvaluators(whereClauses), agentInstanceContext);
        }
        else
        {
            handler = new RouteResultViewHandlerAll(epStatementHandle, internalEventRouter, tableStateInstances, isNamedWindowInsert, processors, ExprNodeUtility.getEvaluators(whereClauses), agentInstanceContext);
        }
    }

    public void update(EventBean[] newData, EventBean[] oldData)
    {
        if (newData == null)
        {
            return;
        }

        for (EventBean bean : newData)
        {
            boolean isHandled = handler.handle(bean, exprEvaluatorContext);

            if (!isHandled)
            {
                updateChildren(new EventBean[] {bean}, null);
            }
        }
    }

    public EventType getEventType()
    {
        return eventType;
    }

    public Iterator iterator()
    {
        return CollectionUtil.NULL_EVENT_ITERATOR;
    }
}