| using Lucene.Net.Analysis.Util; |
| using Lucene.Net.Util; |
| using System; |
| using System.Collections.Generic; |
| using System.IO; |
| |
| namespace Lucene.Net.Analysis.NGram |
| { |
| /* |
| * 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. |
| */ |
| |
| /// <summary> |
| /// Factory for <see cref="NGramTokenizer"/>. |
| /// <code> |
| /// <fieldType name="text_ngrm" class="solr.TextField" positionIncrementGap="100"> |
| /// <analyzer> |
| /// <tokenizer class="solr.NGramTokenizerFactory" minGramSize="1" maxGramSize="2"/> |
| /// </analyzer> |
| /// </fieldType></code> |
| /// </summary> |
| public class NGramTokenizerFactory : TokenizerFactory |
| { |
| private readonly int maxGramSize; |
| private readonly int minGramSize; |
| |
| /// <summary> |
| /// Creates a new <see cref="NGramTokenizerFactory"/> </summary> |
| public NGramTokenizerFactory(IDictionary<string, string> args) |
| : base(args) |
| { |
| minGramSize = GetInt32(args, "minGramSize", NGramTokenizer.DEFAULT_MIN_NGRAM_SIZE); |
| maxGramSize = GetInt32(args, "maxGramSize", NGramTokenizer.DEFAULT_MAX_NGRAM_SIZE); |
| if (args.Count > 0) |
| { |
| throw new ArgumentException(string.Format(J2N.Text.StringFormatter.CurrentCulture, "Unknown parameters: {0}", args)); |
| } |
| } |
| |
| /// <summary> |
| /// Creates the <see cref="TokenStream"/> of n-grams from the given <see cref="TextReader"/> and <see cref="AttributeSource.AttributeFactory"/>. </summary> |
| public override Tokenizer Create(AttributeSource.AttributeFactory factory, TextReader input) |
| { |
| #pragma warning disable 612, 618 |
| if (m_luceneMatchVersion.OnOrAfter(LuceneVersion.LUCENE_44)) |
| #pragma warning restore 612, 618 |
| { |
| return new NGramTokenizer(m_luceneMatchVersion, factory, input, minGramSize, maxGramSize); |
| } |
| else |
| { |
| #pragma warning disable 612, 618 |
| return new Lucene43NGramTokenizer(factory, input, minGramSize, maxGramSize); |
| #pragma warning restore 612, 618 |
| } |
| } |
| } |
| } |