| /* |
| * 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. |
| */ |
| package org.apache.lucene.analysis.te; |
| |
| import java.io.IOException; |
| import org.apache.lucene.analysis.TokenFilter; |
| import org.apache.lucene.analysis.TokenStream; |
| import org.apache.lucene.analysis.miscellaneous.SetKeywordMarkerFilter; |
| import org.apache.lucene.analysis.tokenattributes.CharTermAttribute; |
| import org.apache.lucene.analysis.tokenattributes.KeywordAttribute; |
| |
| /** |
| * A {@link TokenFilter} that applies {@link TeluguNormalizer} to normalize the orthography. |
| * |
| * <p>In some cases the normalization may cause unrelated terms to conflate, so to prevent terms |
| * from being normalized use an instance of {@link SetKeywordMarkerFilter} or a custom {@link |
| * TokenFilter} that sets the {@link KeywordAttribute} before this {@link TokenStream}. |
| * |
| * @since 9.0.0 |
| * @see TeluguNormalizer |
| */ |
| public final class TeluguNormalizationFilter extends TokenFilter { |
| |
| private final TeluguNormalizer normalizer = new TeluguNormalizer(); |
| private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class); |
| private final KeywordAttribute keywordAtt = addAttribute(KeywordAttribute.class); |
| |
| public TeluguNormalizationFilter(TokenStream input) { |
| super(input); |
| } |
| |
| @Override |
| public boolean incrementToken() throws IOException { |
| if (input.incrementToken()) { |
| if (!keywordAtt.isKeyword()) |
| termAtt.setLength(normalizer.normalize(termAtt.buffer(), termAtt.length())); |
| return true; |
| } |
| return false; |
| } |
| } |