converterutils.java

一个数据挖掘系统的源码

/**
 *   
 *   AgentAcademy - an open source Data Mining framework for
 *   training intelligent agents
 *
 *   Copyright (C)   2001-2003 AA Consortium.
 *
 *   This library is open source software; you can redistribute it 
 *   and/or modify it under the terms of the GNU Lesser General 
 *   Public License as published by the Free Software Foundation;   
 *   either version 2.0 of the License, or (at your option) any later 
 *   version.
 *
 *   This library 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 Lesser General Public
 *   License along with this library; if not, write to the Free 
 *   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, 
 *   MA  02111-1307 USA
 * 
 */

package org.agentacademy.modules.dataminer.core.converters;

/**
 * <p>Title: The Data Miner prototype</p>
 * <p>Description: A prototype for the DataMiner (DM), the Agent Academy (AA) module responsible for performing data mining on the contents of the Agent Use Repository (AUR). The extracted knowledge is to be sent back to the AUR in the form of a PMML document.</p>
 * <p>Copyright: Copyright (c) 2002</p>
 * <p>Company: CERTH</p>
 * @author asymeon
 * @version 0.3
 */


import java.io.StreamTokenizer;
import java.io.Serializable;
import java.io.IOException;

/**
 * Utility routines for the converter package.
 *
 * @see Serializable
 */
public class ConverterUtils implements Serializable {

  /**
   * Gets token, skipping empty lines.
   *
   * @param tokenizer the stream tokenizer
   * @exception IOException if reading the next token fails
   */
  public static void getFirstToken(StreamTokenizer tokenizer)
    throws IOException {

    while (tokenizer.nextToken() == StreamTokenizer.TT_EOL){};
    if ((tokenizer.ttype == '\'') ||
	(tokenizer.ttype == '"')) {
      tokenizer.ttype = StreamTokenizer.TT_WORD;
    } else if ((tokenizer.ttype == StreamTokenizer.TT_WORD) &&
	       (tokenizer.sval.equals("?"))) {
      tokenizer.ttype = '?';
    }
  }

  /**
   * Gets token.
   *
   * @param tokenizer the stream tokenizer
   * @exception IOException if reading the next token fails
   */
  public static void getToken(StreamTokenizer tokenizer) throws IOException {

    tokenizer.nextToken();
    if (tokenizer.ttype== StreamTokenizer.TT_EOL) {
      return;
    }

    if ((tokenizer.ttype == '\'') ||
	(tokenizer.ttype == '"')) {
      tokenizer.ttype = StreamTokenizer.TT_WORD;
    } else if ((tokenizer.ttype == StreamTokenizer.TT_WORD) &&
	       (tokenizer.sval.equals("?"))) {
      tokenizer.ttype = '?';
    }
  }

  /**
   * Throws error message with line number and last token read.
   *
   * @param theMsg the error message to be thrown
   * @param tokenizer the stream tokenizer
   * @exception IOExcpetion containing the error message
   */
  public static void errms(StreamTokenizer tokenizer, String theMsg)
    throws IOException {

    throw new IOException(theMsg + ", read " + tokenizer.toString());
  }
}