EvalFilterNode.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.pattern;

import com.espertech.esper.filter.FilterValueSetParam;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.util.List;

/**
 * This class represents a filter of events in the evaluation tree representing any event expressions.
 */
public class EvalFilterNode extends EvalNodeBase
{
    protected final EvalFilterFactoryNode factoryNode;
    private final List<FilterValueSetParam> addendumFilters;

    public EvalFilterNode(PatternAgentInstanceContext context, EvalFilterFactoryNode factoryNode) {
        super(context);
        this.factoryNode = factoryNode;
        if (context.getAgentInstanceContext().getAgentInstanceFilterProxy() != null) {
            this.addendumFilters = context.getAgentInstanceContext().getAgentInstanceFilterProxy().getAddendumFilters(factoryNode.getFilterSpec());
        }
        else {
            this.addendumFilters = null;
        }
    }

    public EvalFilterFactoryNode getFactoryNode() {
        return factoryNode;
    }

    public List<FilterValueSetParam> getAddendumFilters() {
        return addendumFilters;
    }

    public EvalStateNode newState(Evaluator parentNode,
                                  EvalStateNodeNumber stateNodeNumber, long stateNodeId)
    {
        if (getContext().getConsumptionHandler() != null) {
            return new EvalFilterStateNodeConsumeImpl(parentNode, this);
        }
        return new EvalFilterStateNode(parentNode, this);
    }

    private static final Log log = LogFactory.getLog(EvalFilterNode.class);
}