attributeset.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.tools.att;

import edu.udo.cs.yale.example.Attribute;
import edu.udo.cs.yale.tools.XMLException;

import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.Map;
import java.util.HashMap;
import java.util.Set;
import org.xml.sax.SAXException;
import javax.xml.parsers.ParserConfigurationException;

/** Set of regular and special attributes that need not necessarily be associated
 *  with an {@link edu.udo.cs.yale.example.ExampleSet}.
 *
 *  @version $Id: AttributeSet.java,v 2.5 2004/08/27 11:57:46 ingomierswa Exp $ */
public class AttributeSet {

    /** List of regular attributes. */
    private List regularAttributes = new ArrayList();

    /** Names, i.e. Strings are mapped to special attributes. */
    private Map specialAttributes = new HashMap();

    /** The default source file. */
    private File defaultSource;
    
    /** Creates an empty attribute set. */
    public AttributeSet() { }

    /** Creates an empty attribute set. */
    public AttributeSet(int initialCapacity) {
	regularAttributes = new ArrayList(initialCapacity);
    }

    /** Creates an attribute set from a list of {@link AttributeDataSource}s. */
    public AttributeSet(AttributeDataSources attributeDataSources) {
	Iterator i = attributeDataSources.getDataSources().iterator();
	while (i.hasNext()) {
	    AttributeDataSource ads = (AttributeDataSource)i.next();
	    if (ads.getType().equals("attribute")) {
		addAttribute(ads.getAttribute());
	    } else {
		setSpecialAttribute(ads.getType(), ads.getAttribute());
	    }
	}
	this.defaultSource = attributeDataSources.getDefaultSource();
    }

    /** Reads an xml attribute description file and creates an attribute set. */
    public AttributeSet(File attributeDescriptionFile, boolean sourceColRequired) 
	throws XMLException, ParserConfigurationException, SAXException, IOException {

	this(AttributeDataSource.createAttributeDataSources(attributeDescriptionFile, sourceColRequired));
    }

    public AttributeSet(List regularAttributes, Map specialAttributes) {
	this.regularAttributes = regularAttributes;
	this.specialAttributes = specialAttributes;
    }

    /** Returns the default file. */
    public File getDefaultSource() {
	return defaultSource;
    }

    /** Returns an attribute by index. */
    public Attribute getAttribute(int index) {
	return (Attribute)regularAttributes.get(index);
    }

    /** Adds an attribute at the end of the list. */
    public void addAttribute(Attribute attribute) {
	regularAttributes.add(attribute);
    }

    /** Returns a special attribute by name. */
    public Attribute getSpecialAttribute(String name) {
	return (Attribute)specialAttributes.get(name);
    }

    /** Adds a named special attribute. */
    public void setSpecialAttribute(String name, Attribute attribute) {
	specialAttributes.put(name, attribute);
    }

    /** Returns a list of all names (Strings) of all special attributes. */
    public Set getSpecialNames() {
	return specialAttributes.keySet();
    }

    /** Returns a list of all regular attributes. */
    public List getRegularAttributes() {
	return regularAttributes;
    }

    /** Returns the number of regular attributes. */
    public int getNumberOfRegularAttributes() {
	return regularAttributes.size();
    }

    /** Returns a Map mapping names to special attributes. */
    public Map getSpecialAttributes() {
	return specialAttributes;
    }

    /** Returns a list of all, i.e. regular and special attributes. This method creates
     *  a list. The first elements in the list will be the regular attributes, the last
     *  elements will be the special attributes. */
    public List getAllAttributes() {
	List attributes = new LinkedList();
	attributes.addAll(regularAttributes);
	attributes.addAll(specialAttributes.values());
	return attributes;
    }
}