/*
* Copyright (C) 2009 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.application.gadget;
import java.io.IOException;
import java.io.InputStream;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.ext.Locator2;
import org.xml.sax.helpers.DefaultHandler;
/**
* @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
* @version $Revision$
*/
public class EncodingDetector extends DefaultHandler {
public static String detect(InputStream in) throws IOException, ParserConfigurationException, SAXException {
EncodingDetector detector = new EncodingDetector();
SAXParserFactory factory = SAXParserFactory.newInstance();
// Set below feature to avoid loading external DTD - a buggy and slow action.
factory.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
SAXParser parser = factory.newSAXParser();
parser.parse(in, detector);
return detector.encoding;
}
/** . */
private Locator2 locator;
/** Use UTF-8 if nothing provided. */
private String encoding = "UTF-8";
private EncodingDetector() {
}
@Override
public void setDocumentLocator(Locator locator) {
if (locator instanceof Locator2) {
this.locator = (Locator2) locator;
}
}
@Override
public void startDocument() throws SAXException {
if (locator != null) {
encoding = locator.getEncoding();
}
}
}