| /* |
| * 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.ja; |
| |
| import java.util.Map; |
| import org.apache.lucene.analysis.TokenFilterFactory; |
| import org.apache.lucene.analysis.TokenStream; |
| |
| /** |
| * Factory for {@link JapaneseKatakanaStemFilter}. |
| * |
| * <pre class="prettyprint"> |
| * <fieldType name="text_ja" class="solr.TextField"> |
| * <analyzer> |
| * <tokenizer class="solr.JapaneseTokenizerFactory"/> |
| * <filter class="solr.JapaneseKatakanaStemFilterFactory" |
| * minimumLength="4"/> |
| * </analyzer> |
| * </fieldType> |
| * </pre> |
| * |
| * @since 3.6.0 |
| * @lucene.spi {@value #NAME} |
| */ |
| public class JapaneseKatakanaStemFilterFactory extends TokenFilterFactory { |
| |
| /** SPI name */ |
| public static final String NAME = "japaneseKatakanaStem"; |
| |
| private static final String MINIMUM_LENGTH_PARAM = "minimumLength"; |
| private final int minimumLength; |
| |
| /** Creates a new JapaneseKatakanaStemFilterFactory */ |
| public JapaneseKatakanaStemFilterFactory(Map<String, String> args) { |
| super(args); |
| minimumLength = |
| getInt(args, MINIMUM_LENGTH_PARAM, JapaneseKatakanaStemFilter.DEFAULT_MINIMUM_LENGTH); |
| if (minimumLength < 2) { |
| throw new IllegalArgumentException( |
| "Illegal " + MINIMUM_LENGTH_PARAM + " " + minimumLength + " (must be 2 or greater)"); |
| } |
| if (!args.isEmpty()) { |
| throw new IllegalArgumentException("Unknown parameters: " + args); |
| } |
| } |
| |
| /** Default ctor for compatibility with SPI */ |
| public JapaneseKatakanaStemFilterFactory() { |
| throw defaultCtorException(); |
| } |
| |
| @Override |
| public TokenStream create(TokenStream input) { |
| return new JapaneseKatakanaStemFilter(input, minimumLength); |
| } |
| } |