copyminingstream.java

来自「一个数据挖掘软件ALPHAMINERR的整个过程的JAVA版源代码」· Java 代码 · 共 83 行

/*
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

 /**
  * Title: XELOPES Data Mining Library
  * Description: The XELOPES library is an open platform-independent and data-source-independent library for Embedded Data Mining.
  * Copyright: Copyright (c) 2002 Prudential Systems Software GmbH
  * Company: ZSoft (www.zsoft.ru), Prudsys (www.prudsys.com)
  * @author Michael Thess
  * @version 1.0
  */
package com.prudsys.pdm.Transform.Special;

import com.prudsys.pdm.Core.MiningDataSpecification;
import com.prudsys.pdm.Core.MiningException;
import com.prudsys.pdm.Input.MiningFilterStream;
import com.prudsys.pdm.Input.MiningInputStream;
import com.prudsys.pdm.Transform.MiningStreamTransformer;

/**
 * Copies one mining input stream into another one. Used in connection
 * with MiningFilterStream for static transformations.
 *
 * @see MiningInputStream
 * @see MiningFilterStream
 */
public class CopyMiningStream implements MiningStreamTransformer
{
    // -----------------------------------------------------------------------
    //  Constructor
    // -----------------------------------------------------------------------
    /**
     * Empty constructor.
     */
    public CopyMiningStream() {

    }

    // -----------------------------------------------------------------------
    //  Transformation methods
    // -----------------------------------------------------------------------
  /**
   * Copies mining input stream to another one. The
   * targetStream must contain an updatable mining stream.
   *
   * @param sourceStream mining stream used as source to copy
   * @param targetStream mining stream used as target of copy
   * @return number of vectors of transformation
   * @exception MiningException can't copy stream
   */
  public int transform( MiningInputStream sourceStream, MiningInputStream targetStream )
    throws MiningException {

    // Copy metadata:
    MiningDataSpecification metaDataSource = sourceStream.getMetaData();
    targetStream.updateSetMetaData( metaDataSource );

    // Copy stream:
    int nVec = 0;
    sourceStream.reset();
    targetStream.updateRemoveAllVectors();
    while (sourceStream.next()) {
      targetStream.updateAppendVector( sourceStream.read() );
      nVec = nVec + 1;
    };

    return nVec;
  }

}