// LanguageStatisticsHolder.java
// -----------------------
// (C) by Marc Nause; marc.nause@audioattack.de
// first published on http://www.yacy.net
// Braunschweig, Germany, 2008
//
// $LastChangedDate: 2010-12-27 18:07:21 +0100 (Mo, 27. Dez 2010) $
// $LastChangedRevision: 7396 $
// $LastChangedBy: low012 $
//
// 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 net.yacy.document.language;
import java.io.File;
import java.io.FilenameFilter;
import java.util.Vector;
import net.yacy.kelondro.logging.Log;
/**
* This class loads and provides several language statistics to the system.
* It has been implemented as a Singleton since it has to access several
* files on instanciation which should be avoided since it is very slow.
*/
public final class LanguageStatisticsHolder extends Vector<LanguageStatistics> {
private static final long serialVersionUID = -887517724227204705L;
private static final String languageDir = "langstats"; // directory that contains language files
private static LanguageStatisticsHolder instance;
private LanguageStatisticsHolder() {
addAllLanguagesInDirectory(languageDir);
}
/**
* method to get an instance of this class, should be used instead of
* <b>new LanguageStatisticsHolder()</b>
* @return an instance of the class Identificator
*/
public synchronized static LanguageStatisticsHolder getInstance() {
if (instance == null) {
instance = new LanguageStatisticsHolder();
}
return instance;
}
/**
* Reads all language files from a directory.
* @param directory the directory that contains the language files
*/
private void addAllLanguagesInDirectory(final String directory) {
final File folder = new File(directory);
if (!folder.exists()) {
Log.logWarning("LanguageStatistics", "the language statistics folder " + directory + " cannot be found");
return;
}
final FilenameFilter filter = new LanguageFilenameFilter();
final File[] allLanguageFiles = folder.listFiles(filter);
if (allLanguageFiles != null) {
for (int i = 0; i < allLanguageFiles.length; i++) {
if(allLanguageFiles[i].isFile()) {
this.add(new LanguageStatistics(allLanguageFiles[i]));
}
}
}
}
}