tools.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;

import edu.udo.cs.yale.operator.OperatorException;
import edu.udo.cs.yale.operator.UserError;
import edu.udo.cs.yale.operator.Operator;
import edu.udo.cs.yale.tools.plugin.Plugin;

import java.util.*;
import java.util.jar.JarFile;
import java.util.jar.JarEntry;
import java.io.BufferedReader;
import java.io.Reader;
import java.io.PrintStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.FileReader;
import java.io.File;
import java.net.URL;

/** Tools for YALE.
 *  @author simon, ingo
 *  @version $Id: Tools.java,v 2.20 2004/08/27 11:57:45 ingomierswa Exp $
 */
public class Tools {

    public static final String RESOURCE_PREFIX = "edu/udo/cs/yale/resources/";

    /** Returns the name for an ordinal number. */
    public static final String ordinalNumber(int n) {
        if ((n % 10 == 1) && (n % 100 != 11))
	    {  return n+"st"; }
	if ((n % 10 == 2) && (n % 100 != 12))
	    {  return n+"nd"; }
	if ((n % 10 == 3) && (n % 100 != 13))
	    {  return n+"rd"; }
        return n+"th";
    }

    /** Returns the class name of the given class without the package information. */
    public static String classNameWOPackage(Class c) {
	return c.getName().substring(c.getName().lastIndexOf(".")+1);
    }


    /** Reads the output of the reader and delivers it at string.
     */
    public static String readOutput(BufferedReader in) throws IOException {
	StringBuffer output = new StringBuffer();
	String line = "";
	while ((line=in.readLine())!=null) {
	    output.append(line);
	    output.append("\n");
	}
	return output.toString();
    }

    /** Creates a file relative to the given parent if name is not an absolute file name. */
    public static File getFile(File parent, String name) {
	File file = new File(name);
	if (file.isAbsolute()) return file;
	else return new File(parent, name);	
    }

    /** Creates a directory including parent directories. 
     *  @return true, if operation was successful. */
    public static boolean mkdir(File dir) {
	if (dir == null) return true;
	if (dir.exists()) return true;
	File parent = dir.getParentFile();
	if (parent == null) {
	    return true;
	} else if (!parent.exists()) {
	    if (!mkdir(parent)) return false;
	}
	return dir.mkdir();
    }


    /** Waits for process to die and writes log messages. Terminates if exit value is not 0. */
    public static void waitForProcess(Operator operator, 
				      Process process, 
				      String name) throws OperatorException {
	try {
	    LogService.logMessage("Waiting for process '"+name+"' to die.", LogService.MINIMUM);
	    int value= process.waitFor();
	    if (value == 0) {
		LogService.logMessage("Process '"+name+"' terminated successfully.", LogService.TASK);
	    } else {
		throw new UserError(operator, 306, new Object[] { name, new Integer(value) });
	    }
	} catch (InterruptedException e) {
	    throw new RuntimeException("Interrupted waiting for process '"+name+"' to die.", e);
	}
    }


    /** Sends a mail to the given address, using the specified subject and contents.
     *  Subject must contain no whitespace! */
    public static void sendEmail(String address, String subject, String content) {
	try {
	    //subject = subject.replaceAll("\\s", "_"); // replace whitespace
	    String command = ParameterService.getProperty("yale.tools.sendmail.command");
	    // command = command.replaceAll("\\$A", address);
	    // command = command.replaceAll("\\$S", subject);
	    LogService.logMessage("Executing '"+command+"'", LogService.MINIMUM);
	    Process sendmail = Runtime.getRuntime().exec(new String[] { command, address });
	    PrintStream out = new PrintStream(sendmail.getOutputStream());
	    out.println("Subject: "+subject);
	    out.println("From: Yale");
	    out.println("To: "+address);
	    out.println();
	    out.println(content);
	    out.close();
	    waitForProcess(null, sendmail, command);
	} catch (Throwable e) {
	    LogService.logException("Cannot send mail to "+address, e);	    
	}
    }

    public static InputStream openResource(String name) throws IOException {
	return getResource(name).openStream();
    }

    public static URL getResource(String name) {
	return getResource(Tools.class.getClassLoader(), name);
    }

    public static URL getResource(ClassLoader loader, String name) {
	return loader.getResource(RESOURCE_PREFIX + name);
    }

    public static String readTextFile(File file) throws IOException {
	return readTextFile(new FileReader(file));
    }

    public static String readTextFile(Reader r) throws IOException {
	StringBuffer contents = new StringBuffer();
	BufferedReader reader = new BufferedReader(r);
	String line = "";
	while ((line = reader.readLine()) != null) {
	    contents.append(line + "\n");
	}
	reader.close();
	return contents.toString();
    }

    public static final String[] TRUE_STRINGS  = { "true",  "on", "yes", "y" };
    public static final String[] FALSE_STRINGS = { "false", "off", "no", "n" };

    public static boolean booleanValue(String string, boolean deflt) {
	if (string == null) return deflt;
	string = string.toLowerCase().trim();
	for (int i = 0; i < TRUE_STRINGS.length; i++) {
	    if (TRUE_STRINGS[i].equals(string)) {
		return true;
	    }
	}
	for (int i = 0; i < FALSE_STRINGS.length; i++) {
	    if (FALSE_STRINGS[i].equals(string)) {
		return false;
	    }
	}
	return deflt;
    }

    public static File findSourceFile(StackTraceElement e) {
	try {
	    Class clazz = Class.forName(e.getClassName());
	    while (clazz.getDeclaringClass() != null)
		clazz = clazz.getDeclaringClass();
	    String filename = clazz.getName().replace('.', File.separatorChar);
	    return ParameterService.getSourceFile(filename+".java");
	} catch (Throwable t) {
	}
	String filename = e.getClassName().replace('.', File.separatorChar);
	return ParameterService.getSourceFile(filename+".java");
    }


    public static Process launchFileEditor(File file, int line) throws IOException {
	String editor = System.getProperty("yale.tools.editor");
	if (editor == null) throw new IOException("Property 'yale.tools.editor' undefined.");
	editor = editor.replaceAll("%f", file.getAbsolutePath());
	editor = editor.replaceAll("%l", line + "");
	return Runtime.getRuntime().exec(editor);
    }

    /** Replaces angle brackets by html entities.*/
    public static String escapeHTML(String string) {
	if (string == null) return "null";
	string = string.replaceAll("<", "&lt;");
	string = string.replaceAll(">", "&gt;");
	return string;
    }


    public static void findImplementationsInJar(JarFile jar, Class superClass, List implementations) {
	findImplementationsInJar(Tools.class.getClassLoader(), jar, superClass, implementations);
    }

    public static void findImplementationsInJar(ClassLoader loader, JarFile jar, Class superClass, List implementations) {
	Enumeration e = jar.entries();
	while (e.hasMoreElements()) {
	    JarEntry entry = (JarEntry)e.nextElement();
	    String name = entry.getName();
	    int dotClass = name.lastIndexOf(".class");
	    if (dotClass < 0) continue;
	    name = name.substring(0, dotClass);
	    name = name.replaceAll("/", "\\.");
	    //if (!name.startsWith(packageName)) continue;
	    try {
		Class c = loader.loadClass(name);
		if (superClass.isAssignableFrom(c)) {
		    if (!java.lang.reflect.Modifier.isAbstract(c.getModifiers())) {
			implementations.add(name);
		    }
		}
	    } catch (Throwable t) {
	    }
	}
    }

    public static Class classForName(String className) throws ClassNotFoundException {
	try {
	    return Class.forName(className);
	} catch (ClassNotFoundException e) {}
	Iterator i = Plugin.getAllPlugins().iterator();
	while (i.hasNext()) {
	    Plugin p = (Plugin)i.next();
	    try {
		return p.getClassLoader().loadClass(className);
	    } catch (ClassNotFoundException e) { 
		//System.out.println("not found"); 
	    }
	}
	throw new ClassNotFoundException(className);
    }
}