/*******************************************************************************
 * Copyright 2014 Centre for Development of Advanced Computing(C-DAC), Pune
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package in.cdac.medinfo.csnotk.csnolib.icdmap;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.core.LowerCaseFilter;
import org.apache.lucene.analysis.core.WhitespaceTokenizer;

/**
 * An implementation of {@link Analyzer}
 * It is a custom analyzer which extends abstract class Analyzer 
 * 
 */

 class SpecialCharAnalyzer extends Analyzer{

 /**
  *	createComponents method is overrided to use customized {@link Tokenizer}
  * returns {@link TokenStreamComponents}
  */
	 @Override
	 protected TokenStreamComponents createComponents(String fieldName) {
		
	 	Tokenizer whiteSpaceTokenizer = new WhitespaceTokenizer();//explicitly excludes the non-breaking space. 
	 	  LowerCaseFilter lowerCaseFilterTokenStream = new LowerCaseFilter(whiteSpaceTokenizer);//Normalizes token text to lower case.
	 	return new TokenStreamComponents(whiteSpaceTokenizer, lowerCaseFilterTokenStream);	
	 	
	 }

}
