ContextControllerHashedGetterSingleRow.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.core.context.mgr;

import com.asper.sources.net.sf.cglib.reflect.FastMethod;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventPropertyGetter;
import com.espertech.esper.client.EventType;
import com.espertech.esper.client.PropertyAccessException;
import com.espertech.esper.collection.Pair;
import com.espertech.esper.epl.core.EngineImportSingleRowDesc;
import com.espertech.esper.epl.core.MethodResolutionService;
import com.espertech.esper.epl.expression.*;
import com.espertech.esper.util.JavaClassHelper;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.lang.reflect.InvocationTargetException;
import java.util.List;

public class ContextControllerHashedGetterSingleRow implements EventPropertyGetter {
    private static final Log log = LogFactory.getLog(ContextControllerHashedGetterSingleRow.class);

    private final String statementName;
    private final FastMethod fastMethod;
    private final ExprEvaluator[] evaluators;
    private final int granularity;

    public ContextControllerHashedGetterSingleRow(String statementName, String functionName, Pair<Class, EngineImportSingleRowDesc> func, List<ExprNode> parameters, int granularity, MethodResolutionService methodResolutionService, EventType eventType)
        throws ExprValidationException
    {
        ExprNodeUtilSingleRowMethodDesc staticMethodDesc = ExprNodeUtility.resolveSingleRowPluginFunc(func.getFirst().getName(), func.getSecond().getMethodName(), parameters, methodResolutionService, true, eventType, func.getSecond().getMethodName(), true);
        this.statementName = statementName;
        this.evaluators = staticMethodDesc.getChildEvals();
        this.granularity = granularity;
        this.fastMethod = staticMethodDesc.getFastMethod();
    }

    public Object get(EventBean eventBean) throws PropertyAccessException {
        EventBean[] events = new EventBean[] {eventBean};

        Object[] parameters = new Object[evaluators.length];
        for (int i = 0; i < evaluators.length; i++) {
            parameters[i] = evaluators[i].evaluate(events, true, null);
        }

        try
        {
            Object result = fastMethod.invoke(null, parameters);
            if (result == null) {
                return 0;
            }
            int value = ((Number) result).intValue();
            if (value >= 0) {
                return value % granularity;
            }
            return -value % granularity;
        }
        catch (InvocationTargetException e)
        {
            String message = JavaClassHelper.getMessageInvocationTarget(statementName, fastMethod.getJavaMethod(), fastMethod.getDeclaringClass().getName(), parameters, e);
            log.error(message, e.getTargetException());
        }

        return 0;
    }

    public boolean isExistsProperty(EventBean eventBean) {
        return false;
    }

    public Object getFragment(EventBean eventBean) throws PropertyAccessException {
        return null;
    }
}