multipredicateconvert.java

一个数据挖掘软件ALPHAMINERR的整个过程的JAVA版源代码

/**
 * 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 1.2
 */

package com.prudsys.pdm.Input.Multidimensional;

import com.prudsys.pdm.Core.MiningException;
import com.prudsys.pdm.Input.Predicates.CompoundPredicate;
import com.prudsys.pdm.Input.Predicates.ConstantPredicate;
import com.prudsys.pdm.Input.Predicates.Predicate;
import com.prudsys.pdm.Input.Predicates.SimplePredicate;
import com.prudsys.pdm.Input.Predicates.SimpleSetPredicate;

/**
  * Class for conversions to multi predicates.
  */
public class MultiPredicateConvert
{
  /**
   * Converts a 'usual' predicate into a MultiPredicate.
   *
   * @param predicate predicate to convert
   * @return corresponding multi predicate
   * @exception MiningException can't convert predicate
   */
  public static MultiPredicate convertToMultiPredicate(Predicate predicate)
    throws MiningException {

    if (predicate == null)
      return null;

    if (predicate instanceof MultiPredicate)
      return (MultiPredicate) predicate;

    if (predicate instanceof ConstantPredicate) {
      ConstantPredicate cp = (ConstantPredicate) predicate;
      MultiConstantPredicate mcp = new MultiConstantPredicate( cp.getConstant() );
      return mcp;
    }
    else if (predicate instanceof SimplePredicate) {
      SimplePredicate sp = (SimplePredicate) predicate;
      MultiSimplePredicate msp = new MultiSimplePredicate( sp.getAttribute(),
        sp.getValue(), sp.getOperator() );
      return msp;
    }
    else if (predicate instanceof SimpleSetPredicate) {
      SimpleSetPredicate ssp = (SimpleSetPredicate) predicate;
      int nval = ssp.getValuesNumber();
      MultiSimpleSetPredicate mssp = new MultiSimpleSetPredicate( ssp.getAttribute(),
        ssp.getOperator(), nval);
      for (int i = 0; i < nval; i++)
        mssp.setValue( ssp.getStringValue(i), i );
      return mssp;
    }
    else if (predicate instanceof CompoundPredicate) {
      CompoundPredicate cp = (CompoundPredicate) predicate;
      int npred = cp.getPredicatesNumber();
      MultiCompoundPredicate mcp = new MultiCompoundPredicate( cp.getOperator(),
        npred);
      for (int i = 0; i < npred; i++)
        mcp.setPredicate( cp.getPredicate(i), i );
      return mcp;
    }
    else
      throw new MiningException("unknown predicate type");
  }
}