com.espertech.esper.epl.expression.dot.ExprDotMethodEvalNoDuck 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.epl.expression.dot;

import com.espertech.esper.client.EventBean;
import com.espertech.esper.epl.expression.core.ExprEvaluator;
import com.espertech.esper.epl.expression.core.ExprEvaluatorContext;
import com.espertech.esper.epl.rettype.EPType;
import com.espertech.esper.epl.rettype.EPTypeHelper;
import com.espertech.esper.util.JavaClassHelper;
import net.sf.cglib.reflect.FastMethod;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.lang.reflect.InvocationTargetException;

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

    protected final String statementName;
    protected final FastMethod method;
    private final ExprEvaluator[] parameters;

    public ExprDotMethodEvalNoDuck(String statementName, FastMethod method, ExprEvaluator[] parameters)
    {
        this.statementName = statementName;
        this.method = method;
        this.parameters = parameters;
    }

    public void visit(ExprDotEvalVisitor visitor) {
        visitor.visitMethod(method.getName());
    }

    public Object evaluate(Object target, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext) {
        if (target == null) {
            return null;
        }

		Object[] args = new Object[parameters.length];
		for(int i = 0; i < args.length; i++)
		{
			args[i] = parameters[i].evaluate(eventsPerStream, isNewData, exprEvaluatorContext);
		}

		try
		{
            return method.invoke(target, args);
		}
		catch (InvocationTargetException e)
		{
            String message = JavaClassHelper.getMessageInvocationTarget(statementName, method.getJavaMethod(), target.getClass().getName(), args, e);
            log.error(message, e.getTargetException());
		}
        return null;
    }

    public EPType getTypeInfo() {
        return EPTypeHelper.fromMethod(method.getJavaMethod());
    }
}