| /* |
| * 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.ngram; |
| |
| |
| import org.apache.lucene.analysis.TokenStream; |
| import org.apache.lucene.analysis.Tokenizer; |
| import org.apache.lucene.analysis.util.TokenizerFactory; |
| import org.apache.lucene.util.AttributeFactory; |
| |
| import java.io.Reader; |
| import java.util.Map; |
| |
| /** |
| * Factory for {@link NGramTokenizer}. |
| * <pre class="prettyprint"> |
| * <fieldType name="text_ngrm" class="solr.TextField" positionIncrementGap="100"> |
| * <analyzer> |
| * <tokenizer class="solr.NGramTokenizerFactory" minGramSize="1" maxGramSize="2"/> |
| * </analyzer> |
| * </fieldType></pre> |
| * |
| * @since 3.1 |
| * @lucene.spi {@value #NAME} |
| */ |
| public class NGramTokenizerFactory extends TokenizerFactory { |
| |
| /** SPI name */ |
| public static final String NAME = "nGram"; |
| |
| private final int maxGramSize; |
| private final int minGramSize; |
| |
| /** Creates a new NGramTokenizerFactory */ |
| public NGramTokenizerFactory(Map<String, String> args) { |
| super(args); |
| minGramSize = getInt(args, "minGramSize", NGramTokenizer.DEFAULT_MIN_NGRAM_SIZE); |
| maxGramSize = getInt(args, "maxGramSize", NGramTokenizer.DEFAULT_MAX_NGRAM_SIZE); |
| if (!args.isEmpty()) { |
| throw new IllegalArgumentException("Unknown parameters: " + args); |
| } |
| } |
| |
| /** Creates the {@link TokenStream} of n-grams from the given {@link Reader} and {@link AttributeFactory}. */ |
| @Override |
| public Tokenizer create(AttributeFactory factory) { |
| return new NGramTokenizer(factory, minGramSize, maxGramSize); |
| } |
| } |