| /* |
| * 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.miscellaneous; |
| |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| import org.apache.lucene.analysis.TokenStream; |
| import org.apache.lucene.analysis.tokenattributes.CharTermAttribute; |
| import org.apache.lucene.analysis.tokenattributes.KeywordAttribute; |
| |
| /** |
| * Marks terms as keywords via the {@link KeywordAttribute}. Each token |
| * that matches the provided pattern is marked as a keyword by setting |
| * {@link KeywordAttribute#setKeyword(boolean)} to <code>true</code>. |
| */ |
| public final class PatternKeywordMarkerFilter extends KeywordMarkerFilter { |
| private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class); |
| private final Matcher matcher; |
| |
| /** |
| * Create a new {@link PatternKeywordMarkerFilter}, that marks the current |
| * token as a keyword if the tokens term buffer matches the provided |
| * {@link Pattern} via the {@link KeywordAttribute}. |
| * |
| * @param in |
| * TokenStream to filter |
| * @param pattern |
| * the pattern to apply to the incoming term buffer |
| **/ |
| public PatternKeywordMarkerFilter(TokenStream in, Pattern pattern) { |
| super(in); |
| this.matcher = pattern.matcher(""); |
| } |
| |
| @Override |
| protected boolean isKeyword() { |
| matcher.reset(termAtt); |
| return matcher.matches(); |
| } |
| |
| } |