parametertypedouble.java

一个很好的LIBSVM的JAVA源码。对于要研究和改进SVM算法的学者。可以参考。来自数据挖掘工具YALE工具包。

/*
 *  YALE - Yet Another Learning Environment
 *  Copyright (C) 2001-2004
 *      Simon Fischer, Ralf Klinkenberg, Ingo Mierswa, 
 *          Katharina Morik, Oliver Ritthoff
 *      Artificial Intelligence Unit
 *      Computer Science Department
 *      University of Dortmund
 *      44221 Dortmund,  Germany
 *  email: [e-mail]
 *  web:   http://yale.cs.uni-dortmund.de/
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License as 
 *  published by the Free Software Foundation; either version 2 of the
 *  License, or (at your option) any later version. 
 *
 *  This program 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 General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 *  USA.
 */
package edu.udo.cs.yale.operator.parameter;

public class ParameterTypeDouble extends ParameterTypeNumber {

    private double defaultValue = Double.NaN;
    private double min          = Double.NEGATIVE_INFINITY;
    private double max          = Double.POSITIVE_INFINITY;
    private boolean noDefault   = true;
    private boolean optional    = true;

    public ParameterTypeDouble(String key, String description, double min, double max) {
	this(key, description, min, max, Double.NaN);
	this.noDefault = true;
	this.optional  = false;
    }

    public ParameterTypeDouble(String key, String description, double min, double max, boolean optional) {
	this(key, description, min, max, Double.NaN);
	this.noDefault = true;
	this.optional  = optional;
    }

    public ParameterTypeDouble(String key, String description, double min, double max, double defaultValue) {
	super(key, description);
	this.defaultValue = defaultValue;
	this.min = min;
	this.max = max;
	this.optional  = true;
    }

    public double getMinValue() { return min; }
    public double getMaxValue() { return max; }
    public double getDefault() { return defaultValue; }
    public boolean isOptional() { return optional; }

    public Object getDefaultValue() { 
	if (Double.isNaN(defaultValue)) {
	    return null;
	} else {
	    return new Double(defaultValue); 
	}
    }

    public Object checkValue(Object value) { 
	String string = (String)value;
	Double doubleValue = null;
	try {
	    doubleValue = Double.valueOf(string);
	    if (doubleValue.doubleValue() < min) {
		doubleValue = new Double(min);
		illegalValue(value, doubleValue);
	    } else if (doubleValue.doubleValue() > max) {
		doubleValue = new Double(max);
		illegalValue(value, doubleValue);
	    }	    
	} catch (NumberFormatException e) {
	    doubleValue = new Double(defaultValue);
	    illegalValue(value, doubleValue);
	}
	return doubleValue;
    }

    public String getRange() {
	String range = "real; ";
	if (min == Double.NEGATIVE_INFINITY) range += "-\u221E"; else range += min;
	range += "-";
	if (max == Double.POSITIVE_INFINITY) range += "+\u221E"; else range += max;
	if (!noDefault) range += "; default: " + defaultValue;
	return range;
    }
}