package org.apache.lucene.analysis.fa;
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
import java.io.IOException;
import org.apache.lucene.analysis.TokenFilter;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.TermAttribute;
/**
* A {@link TokenFilter} that applies {@link PersianNormalizer} to normalize the
* orthography.
*
*/
public final class PersianNormalizationFilter extends TokenFilter {
private final PersianNormalizer normalizer;
private TermAttribute termAtt;
public PersianNormalizationFilter(TokenStream input) {
super(input);
normalizer = new PersianNormalizer();
termAtt = (TermAttribute) addAttribute(TermAttribute.class);
}
public boolean incrementToken() throws IOException {
if (input.incrementToken()) {
int newlen = normalizer.normalize(termAtt.termBuffer(), termAtt
.termLength());
termAtt.setTermLength(newlen);
return true;
} else {
return false;
}
}
}