| using Lucene.Net.Analysis; |
| using Lucene.Net.Sandbox.Queries; |
| using Lucene.Net.Search; |
| using System.Xml; |
| |
| namespace Lucene.Net.QueryParsers.Xml.Builders |
| { |
| /* |
| * 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> |
| /// Builder for <see cref="FuzzyLikeThisQuery"/> |
| /// </summary> |
| public class FuzzyLikeThisQueryBuilder : IQueryBuilder |
| { |
| private const int DEFAULT_MAX_NUM_TERMS = 50; |
| #pragma warning disable 612, 618 |
| private const float DEFAULT_MIN_SIMILARITY = SlowFuzzyQuery.defaultMinSimilarity; |
| #pragma warning restore 612, 618 |
| private const int DEFAULT_PREFIX_LENGTH = 1; |
| private const bool DEFAULT_IGNORE_TF = false; |
| |
| private readonly Analyzer analyzer; |
| |
| public FuzzyLikeThisQueryBuilder(Analyzer analyzer) |
| { |
| this.analyzer = analyzer; |
| } |
| |
| public virtual Query GetQuery(XmlElement e) |
| { |
| XmlNodeList nl = e.GetElementsByTagName("Field"); |
| int maxNumTerms = DOMUtils.GetAttribute(e, "maxNumTerms", DEFAULT_MAX_NUM_TERMS); |
| FuzzyLikeThisQuery fbq = new FuzzyLikeThisQuery(maxNumTerms, analyzer); |
| fbq.IgnoreTF = DOMUtils.GetAttribute(e, "ignoreTF", DEFAULT_IGNORE_TF); |
| |
| for (int i = 0; i < nl.Count; i++) |
| { |
| XmlElement fieldElem = (XmlElement)nl.Item(i); |
| float minSimilarity = DOMUtils.GetAttribute(fieldElem, "minSimilarity", DEFAULT_MIN_SIMILARITY); |
| int prefixLength = DOMUtils.GetAttribute(fieldElem, "prefixLength", DEFAULT_PREFIX_LENGTH); |
| string fieldName = DOMUtils.GetAttributeWithInheritance(fieldElem, "fieldName"); |
| |
| string value = DOMUtils.GetText(fieldElem); |
| fbq.AddTerms(value, fieldName, minSimilarity, prefixLength); |
| } |
| |
| fbq.Boost = DOMUtils.GetAttribute(e, "boost", 1.0f); |
| return fbq; |
| } |
| } |
| } |