| /* |
| * 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.en; |
| |
| import java.io.IOException; |
| import org.apache.lucene.analysis.TokenFilter; |
| import org.apache.lucene.analysis.TokenStream; |
| import org.apache.lucene.analysis.tokenattributes.CharTermAttribute; |
| |
| /** TokenFilter that removes possessives (trailing 's) from words. */ |
| public final class EnglishPossessiveFilter extends TokenFilter { |
| private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class); |
| |
| public EnglishPossessiveFilter(TokenStream input) { |
| super(input); |
| } |
| |
| @Override |
| public boolean incrementToken() throws IOException { |
| if (!input.incrementToken()) { |
| return false; |
| } |
| |
| final char[] buffer = termAtt.buffer(); |
| final int bufferLength = termAtt.length(); |
| |
| if (bufferLength >= 2 |
| && (buffer[bufferLength - 2] == '\'' |
| || buffer[bufferLength - 2] == '\u2019' |
| || buffer[bufferLength - 2] == '\uFF07') |
| && (buffer[bufferLength - 1] == 's' || buffer[bufferLength - 1] == 'S')) { |
| termAtt.setLength(bufferLength - 2); // Strip last 2 characters off |
| } |
| |
| return true; |
| } |
| } |