labeldescription.java

Boosting算法软件包

package jboost.examples;

import java.util.List;
import java.util.StringTokenizer;

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

/**
 * the description for multi-finite attributes.
 */
public class LabelDescription extends FiniteDescription {
    LabelDescription(String name, Configuration c, List okValues)
	throws ClassNotFoundException {
	super(name,c,okValues);
	attributeClass = Class.forName("jboost.examples.LabelDescription");
	multiLabel = c.getBool("multiLabel", false);
    }

    private boolean multiLabel;
    public boolean isMultiLabel() {
	return multiLabel;
    }

    public String toString() {
	return super.toString() + " multiLabel: " + multiLabel;
    }

/*
    public String toString(Attribute attr) throws Exception {
	String retval=new String();
	boolean[] tok=((MultiDiscreteAttribute)attr).getValue();
	if(tok==null) {
		int tok1=((MultiDiscreteAttribute)attr).getSingleValue();
		if(tok1>attributeValues.size()) throw(new Exception("More attribute values than allowed"));
		retval+=(String)attributeValues.get(tok1);
	} else 	{	
	    if(tok.length>attributeValues.size()) throw(new Exception("More attribute values than allowed"));
	    for(int i=0;i<tok.length;i++) {
	    	if(tok[i]==true)
	    	    retval+=(String)attributeValues.get(i);
// This should be improved when the reader is integrated.
	    }    
	}
	return(retval);
    }
*/

    /** Reads a MultiFinite attribute 
     *  Note that it is currently based on String but should use StringBuffer 
     *  Also note that right now it can only deal with one value.
     */
    public Attribute str2Att(String string) throws BadAttException {
	if(string == null) return new Label(null);

	StringTokenizer st = new StringTokenizer(string);
	if (!multiLabel && (st.countTokens() != 1))
	    throw new BadAttException((st.countTokens() == 0
				       ? "Zero"
				       : "Multiple")
				      + " labels found when expecting single label: "+string);
	String s;
	boolean v[] = new boolean[getNoOfValues()];
	while(st.hasMoreElements()) {
	    s = st.nextToken();
	    if(!caseSignificant)
		s = s.toLowerCase();
	    if(!punctuationSignificant)
		s = StringOp.removePunctuation(s);
	    if(map.containsKey(s)) 
		v[((Integer) map.get(s)).intValue()] = true;
	    else if(map.containsKey("*"))
		v[((Integer) map.get("*")).intValue()] = true;
	    else
		throw(new BadAttException("Unknown label: "+s
					  +" when not allowed."));
	}
	return new Label(v);
    }
}