iddescription.java

Boosting算法软件包

package jboost.examples;

import jboost.controller.Configuration;
import jboost.tokenizer.BadAttException;

/**
 * The description for a private weight of each example.
 */
public class IdDescription extends IntegerDescription {

    public static final int MAX_ID = Integer.MAX_VALUE;
  
  IdDescription(String name, Configuration config, int default_val) 
  throws ClassNotFoundException {
    super(name,config);
  }

  
  /** 
   *  Reads an id 
   *  If no value is specified, default to 1
   *  If the value is negative, return 0 as the weight.
   *  If the value is greater than 1, return 1.
   * @param weight the string representation of the weight
   * @return Attribute the RealAttribute corresponding to the weight
   */
  public Attribute str2Att(String id) throws BadAttException {
    double att = 1.0; // initialized because try complains otherwise.    

    if (id != null) {
      id= id.trim(); 
      if (id.length() != 0) {
        try {
          att= Double.parseDouble(id);
        } catch (NumberFormatException nfe) {
          throw new BadAttException(id + " is not a float",0,0);          
        }
        if (att < 0) {
	    att= 0;
	    throw new BadAttException("The id: " + id + " is less than 0",0,0);          
        }
        if (att > MAX_ID) {
	    throw new BadAttException("The id: " + id + " is larger than MAX_ID=" + MAX_ID,0,0);          
        } 
      }
    }
    return new RealAttribute (att);
  }

}