aggregationconcat.java

High performance DB query

/*
 * @(#)$Id: AggregationConcat.java,v 1.4 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;
import util.network.serialization.SerializeString;

/**
 * Class AggregationSum
 *
 */
public class AggregationConcat implements AggregationOperator {

    public static long serialVersionUID =
        SerializationManager.getSerialUID(
            "pier.helpers.aggregation.AggregationConcat");
    private String value;

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

    /**
     * Constructor AggregationSum
     *
     * @param inputBuffer
     */
    public AggregationConcat(GenericByteBuffer inputBuffer) {
        this.value = SerializeString.deSerialize(inputBuffer);
    }

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

    /**
     * Method serialize
     *
     * @param outputBuffer
     * @return
     */
    public long serialize(GenericByteBuffer outputBuffer) {
        SerializeString.serialize(outputBuffer, value);

        return serialVersionUID;
    }

    /**
     * Constructor AggregationSum
     */
    public AggregationConcat() {
        value = null;
    }

    /**
     * Method addBaseValue
     *
     * @param data
     * @return
     */
    public boolean addBaseValue(Object data) {
        if (value == null) {
            value = data.toString();
        } else {
            value += data.toString();
        }

        return true;
    }

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

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

    /**
     * Method getSize
     * @return
     */
    public int getSize() {
        return value.length();
    }

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

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

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

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

        newObject.value = value.toString();

        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-CONCAT:" + value);
    }
}