aggregationcount.java

High performance DB query

/*
 * @(#)$Id: AggregationCount.java,v 1.9 2005/04/13 20:17:44 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.aggregation;

import services.network.Payload;
import util.network.serialization.GenericByteBuffer;
import util.network.serialization.SerializationManager;

/**
 * Class AggregationCount
 *
 */
public class AggregationCount implements AggregationOperator {

    public static long serialVersionUID =
        SerializationManager.getSerialUID(
            "pier.helpers.aggregation.AggregationCount");
    private long count;

    /**
     * DeSerialize the object from the provided GenericByteBuffer.
     *
     * @param inputBuffer
     */

    /**
     * Constructor AggregationCount
     *
     * @param inputBuffer
     */
    public AggregationCount(GenericByteBuffer inputBuffer) {
        this.count = inputBuffer.getLong();
    }

    /**
     * Serialize the object into the provided GenericByteBuffer.
     *
     * @param outputBuffer
     * @return
     */

    /**
     * Method serialize
     *
     * @param outputBuffer
     * @return
     */
    public long serialize(GenericByteBuffer outputBuffer) {
        outputBuffer.putLong(count);

        return serialVersionUID;
    }

    /**
     * Constructor AggregationCount
     */
    public AggregationCount() {
        count = 0;
    }

    /**
     * Method addBaseValue
     *
     * @param data
     * @return
     */
    public boolean addBaseValue(Object data) {
        count++;

        return true;
    }

    /**
     * Method addPartialResult
     *
     * @param data
     * @return
     */
    public boolean addPartialResult(AggregationOperator data) {
        long add = ((AggregationCount) data).count;

        if (add > 0) {
            count += add;

            return true;
        } else {
            return false;
        }
    }

    /**
     * Method result
     * @return
     */
    public Object result() {
        return new Long(count);
    }

    /**
     * Method getSize
     * @return
     */
    public int getSize() {
        return Payload.LONG_SIZE;
    }

    /**
     * Method hashCode
     * @return
     */
    public int hashCode() {
        return new Long(count).hashCode();
    }

    /**
     * Method equals
     *
     * @param other
     * @return
     */
    public boolean equals(Object other) {
        return (count == (((AggregationCount) other).count));
    }

    /**
     * Method compareTo
     *
     * @param o
     * @return
     */
    public int compareTo(Object o) {
        if (count > (((AggregationCount) o).count)) {
            return 1;
        }

        if (count < (((AggregationCount) o).count)) {
            return -1;
        }

        return 0;
    }

    /**
     * Method getClone
     * @return
     */
    public Object getClone() {
        AggregationCount newObject = new AggregationCount();

        newObject.count = count;

        return newObject;
    }

    /**
     * Method add
     *
     * @param other
     * @return
     */
    public Object add(Object other) {
        AggregationCount newObject = new AggregationCount();

        newObject.count = count + ((AggregationCount) other).count;

        return newObject;
    }

    /**
     * Method divide
     *
     * @param denominator
     * @return
     */
    public Object divide(long denominator) {
        AggregationCount newObject = new AggregationCount();

        newObject.count = count / denominator;

        return newObject;
    }

    /**
     * Method toString
     * @return
     */
    public String toString() {
        return new String("AGG-COUNT:" + count);
    }
}