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/**

Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016.  All rights reserved.

Contact:
     SYSTAP, LLC DBA Blazegraph
     2501 Calvert ST NW #106
     Washington, DC 20008
     [email protected]

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; version 2 of the License.

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
*/
/*
 * Created on May 6, 2014 by Jeremy J. Carroll, Syapse Inc.
 */
package com.bigdata.search;

import java.io.IOException;
import java.io.StringReader;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.miscellaneous.EmptyTokenStream;
import org.apache.lucene.analysis.standard.StandardTokenizer;

/**
 * An analyzer that always returns an {@link EmptyTokenStream}, this can
 * be used with {@link ConfigurableAnalyzerFactory}
 * to switch off indexing and searching for specific language tags.
 * @author jeremycarroll
 *
 */
public class EmptyAnalyzer extends Analyzer {

	@Override
	protected TokenStreamComponents createComponents(String input) {
		Tokenizer source = new Tokenizer() {
			@Override
			public boolean incrementToken() throws IOException {
				return false;
			}
		};
	    return new TokenStreamComponents(source);
	}

}