functionstats.java

High performance DB query

/*
 * @(#)$Id: FunctionStats.java,v 1.4 2004/07/02 23:59:21 huebsch Exp $
 *
 * Copyright (c) 2001-2004 Regents of the University of California.
 * All rights reserved.
 *
 * This file is distributed under the terms in the attached BERKELEY-LICENSE
 * file. If you do not find these files, copies can be found by writing to:
 * Computer Science Division, Database Group, Universite of California,
 * 617 Soda Hall #1776, Berkeley, CA 94720-1776. Attention: Berkeley License
 *
 * Copyright (c) 2003-2004 Intel Corporation. All rights reserved.
 *
 * This file is distributed under the terms in the attached INTEL-LICENSE file.
 * If you do not find these files, copies can be found by writing to:
 * Intel Research Berkeley, 2150 Shattuck Avenue, Suite 1300,
 * Berkeley, CA, 94704.  Attention:  Intel License Inquiry.
 */


package pier.helpers.functions;

import services.stats.BasicDoubleCounter;
import services.stats.BasicDoubleResponse;
import services.stats.StatCollector;

/**
 * Class FunctionEnvvar
 *
 */
public class FunctionStats implements Function {

    /**
     * Method evaluate
     *
     * @param parameters
     * @return
     */
    public Object evaluate(Object[] parameters) {
        int params = parameters.length;

        if (params == 4) {
            int category;
            int user;
            int service;

            try {
                category = ((Integer) parameters[0]).intValue();
                user = ((Integer) parameters[1]).intValue();
                service = ((Integer) parameters[2]).intValue();
            } catch (Exception exception) {
                return null;
            }

            Object statObject;

            try {
                statObject = StatCollector.getStatsObject(category, user,
                                                          service);
            } catch (Exception exception) {
                return null;
            }

            if (statObject instanceof BasicDoubleCounter) {
                if (parameters[3].toString().equalsIgnoreCase("COUNT")) {
                    return new Long(
                        ((BasicDoubleCounter) statObject).getCount());
                }

                if (parameters[3].toString().equalsIgnoreCase("SUM")) {
                    return new Double(
                        ((BasicDoubleCounter) statObject).getSum());
                }

                if (parameters[3].toString().equalsIgnoreCase("MIN")) {
                    return new Double(
                        ((BasicDoubleCounter) statObject).getMin());
                }

                if (parameters[3].toString().equalsIgnoreCase("MAX")) {
                    return new Double(
                        ((BasicDoubleCounter) statObject).getMax());
                }

                if (parameters[3].toString().equalsIgnoreCase("AVG")) {
                    return new Double(
                        ((BasicDoubleCounter) statObject).getAvg());
                }
            }

            if (statObject instanceof BasicDoubleResponse) {
                if (parameters[3].toString().equalsIgnoreCase("COUNT")) {
                    return new Long(
                        ((BasicDoubleResponse) statObject).getCount());
                }

                if (parameters[3].toString().equalsIgnoreCase("FIRST")) {
                    return new Double(
                        ((BasicDoubleResponse) statObject).getFirst());
                }

                if (parameters[3].toString().equalsIgnoreCase("LAST")) {
                    return new Double(
                        ((BasicDoubleResponse) statObject).getLast());
                }

                if (parameters[3].toString().equalsIgnoreCase("XTH")) {
                    return new Double(
                        ((BasicDoubleResponse) statObject).getXth());
                }
            }

            return null;
        } else {
            return null;
        }
    }

    /**
     * Method cacheable
     * @return
     */
    public boolean cacheable() {
        return false;
    }
}