numberdescription.java

Boosting算法软件包

package jboost.examples;

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

/**
 * the description for number attributes.
 */
class NumberDescription extends AttributeDescription {
  NumberDescription(String name, Configuration c) throws ClassNotFoundException {
    attributeName = name;
    attributeClass = Class.forName("jboost.examples.RealAttribute");
    
//  Need to make a SAFE version of configuration, which implements an error() function, which
//  can return and error message.
    
    crucial=c.getBool("crucial",false);
    ignoreAttribute=c.getBool("ignoreAttribute",false);
    existence=c.getBool("existence",false);
    existence=c.getBool("order",true);
  }
  
  /** checks format of string in datafile and converts to float 
   *  
   *  If the attribute is missing it creates a new
   *  real attribute, that is not defined.
   */
  public Attribute str2Att(String string) throws BadAttException {
    if(string == null) return(new RealAttribute());
    string=string.trim();
    if(string.length()==0) return(new RealAttribute());
    double att = 0.; // initialized because try complains otherwise.
    try {
      att = Double.parseDouble(string);
    }
    catch (NumberFormatException e) {
      System.err.println(string + " is not a float.");
      throw new BadAttException(string+" is not a float",0,0);
    }
    return new RealAttribute (att);
  }
  
  public String toString() {
    String retval=new String(attributeName);
    retval+=" "+attributeClass.getName();
    retval+=" crucial: "+crucial;
    retval+=" ignoreAttribute: "+ignoreAttribute;
    retval+=" existence: "+existence;
    retval+=" order: "+order;
    return(retval);
  }
  
  public String toString(Attribute attr) {
    String retval=new String();
    if(attr==null) return("undefined");
    retval+=((RealAttribute)attr).toString();
    return(retval);
  }
}