aggregationmin.java

High performance DB query

/*
 * @(#)$Id: AggregationMin.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 pier.data.DataTypes;
import util.network.serialization.GenericByteBuffer;
import util.network.serialization.SerializationManager;

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

    public static long serialVersionUID =
        SerializationManager.getSerialUID(
            "pier.helpers.aggregation.AggregationMin");
    private Object lowVal;

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

    /**
     * Constructor AggregationMin
     *
     * @param inputBuffer
     */
    public AggregationMin(GenericByteBuffer inputBuffer) {
        this.lowVal = SerializationManager.deSerializeExtended(inputBuffer);
    }

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

    /**
     * Method serialize
     *
     * @param outputBuffer
     * @return
     */
    public long serialize(GenericByteBuffer outputBuffer) {
        SerializationManager.serializeExtended(outputBuffer, lowVal);

        return serialVersionUID;
    }

    /**
     * Constructor AggregationMin
     */
    public AggregationMin() {
        lowVal = null;
    }

    /**
     * Method addBaseValue
     *
     * @param data
     * @return
     */
    public boolean addBaseValue(Object data) {
        if ((lowVal == null) || ((Comparable) lowVal).compareTo(data) > 0) {
            lowVal = data;

            return true;
        } else {
            return false;
        }
    }

    /**
     * Method addPartialResult
     *
     * @param data
     * @return
     */
    public boolean addPartialResult(AggregationOperator data) {
        return addBaseValue(((AggregationMin) data).lowVal);
    }

    /**
     * Method result
     * @return
     */
    public Object result() {
        return lowVal;
    }

    /**
     * Method getSize
     * @return
     */
    public int getSize() {
        return DataTypes.getSize(lowVal);
    }

    /**
     * Method hashCode
     * @return
     */
    public int hashCode() {
        return lowVal.hashCode();
    }

    /**
     * Method equals
     *
     * @param other
     * @return
     */
    public boolean equals(Object other) {
        return (lowVal.equals(((AggregationMin) other).lowVal));
    }

    /**
     * Method compareTo
     *
     * @param o
     * @return
     */
    public int compareTo(Object o) {
        return DataTypes.compareTo(lowVal, ((AggregationMin) o).lowVal);
    }

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

        newObject.lowVal = DataTypes.getClone(lowVal);

        return newObject;
    }

    /**
     * Method add
     *
     * @param other
     * @return
     */
    public Object add(Object other) {
        throw new RuntimeException(
            "DataTypes: Unsupported data type for adding: " + this.getClass()
            + " and " + other.getClass());
    }

    /**
     * Method divide
     *
     * @param denominator
     * @return
     */
    public Object divide(long denominator) {
        throw new RuntimeException(
            "DataTypes: Unsupported data type for division: "
            + this.getClass());
    }

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