| using Lucene.Net.Analysis; |
| using Lucene.Net.QueryParsers.Classic; |
| using Lucene.Net.Search; |
| using Lucene.Net.Util; |
| 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> |
| /// <see cref="UserInputQueryBuilder"/> uses 1 of 2 strategies for thread-safe parsing: |
| /// 1) Synchronizing access to "Parse" calls on a previously supplied <see cref="QueryParser"/> |
| /// or.. |
| /// 2) creating a new <see cref="QueryParser"/> object for each parse request |
| /// </summary> |
| public class UserInputQueryBuilder : IQueryBuilder |
| { |
| private readonly QueryParser unSafeParser; // LUCENENET: marked readonly |
| private readonly Analyzer analyzer; // LUCENENET: marked readonly |
| private readonly string defaultField; // LUCENENET: marked readonly |
| |
| /// <summary> |
| /// This constructor has the disadvantage of not being able to change choice of default field name |
| /// </summary> |
| /// <param name="parser">thread un-safe query parser</param> |
| public UserInputQueryBuilder(QueryParser parser) |
| { |
| this.unSafeParser = parser; |
| } |
| |
| public UserInputQueryBuilder(string defaultField, Analyzer analyzer) |
| { |
| this.analyzer = analyzer; |
| this.defaultField = defaultField; |
| } |
| |
| /// <summary> |
| /// (non-Javadoc) |
| /// @see org.apache.lucene.xmlparser.QueryObjectBuilder#process(org.w3c.dom.Element) |
| /// </summary> |
| /// <param name="e"></param> |
| /// <returns></returns> |
| public virtual Query GetQuery(XmlElement e) |
| { |
| string text = DOMUtils.GetText(e); |
| try |
| { |
| Query q = null; |
| if (unSafeParser != null) |
| { |
| //synchronize on unsafe parser |
| lock (unSafeParser) |
| { |
| q = unSafeParser.Parse(text); |
| } |
| } |
| else |
| { |
| string fieldName = DOMUtils.GetAttribute(e, "fieldName", defaultField); |
| //Create new parser |
| QueryParser parser = CreateQueryParser(fieldName, analyzer); |
| q = parser.Parse(text); |
| } |
| q.Boost = DOMUtils.GetAttribute(e, "boost", 1.0f); |
| return q; |
| } |
| catch (ParseException e1) |
| { |
| throw new ParserException(e1.Message); |
| } |
| } |
| |
| /// <summary> |
| /// Method to create a <see cref="QueryParser"/> - designed to be overridden |
| /// </summary> |
| /// <returns><see cref="QueryParser"/></returns> |
| protected virtual QueryParser CreateQueryParser(string fieldName, Analyzer analyzer) |
| { |
| #pragma warning disable 612, 618 |
| return new QueryParser(LuceneVersion.LUCENE_CURRENT, fieldName, analyzer); |
| #pragma warning restore 612, 618 |
| } |
| } |
| } |