| using Lucene.Net.Index; |
| using System.Collections.Generic; |
| using JCG = J2N.Collections.Generic; |
| |
| namespace Lucene.Net.Documents |
| { |
| /* |
| * 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> |
| /// A <see cref="StoredFieldVisitor"/> that creates a |
| /// <see cref="Document"/> containing all stored fields, or only specific |
| /// requested fields provided to <see cref="DocumentStoredFieldVisitor.DocumentStoredFieldVisitor(ISet{string})"/>. |
| /// <para/> |
| /// This is used by <see cref="IndexReader.Document(int)"/> to load a |
| /// document. |
| /// |
| /// @lucene.experimental |
| /// </summary> |
| public class DocumentStoredFieldVisitor : StoredFieldVisitor |
| { |
| private readonly Document doc = new Document(); |
| private readonly ISet<string> fieldsToAdd; |
| |
| /// <summary> |
| /// Load only fields named in the provided <see cref="ISet{String}"/>. </summary> |
| /// <param name="fieldsToAdd"> Set of fields to load, or <c>null</c> (all fields). </param> |
| public DocumentStoredFieldVisitor(ISet<string> fieldsToAdd) |
| { |
| this.fieldsToAdd = fieldsToAdd; |
| } |
| |
| /// <summary> |
| /// Load only fields named in the provided fields. </summary> |
| public DocumentStoredFieldVisitor(params string[] fields) |
| { |
| fieldsToAdd = new JCG.HashSet<string>(); |
| foreach (string field in fields) |
| { |
| fieldsToAdd.Add(field); |
| } |
| } |
| |
| /// <summary> |
| /// Load all stored fields. </summary> |
| public DocumentStoredFieldVisitor() |
| { |
| this.fieldsToAdd = null; |
| } |
| |
| public override void BinaryField(FieldInfo fieldInfo, byte[] value) |
| { |
| doc.Add(new StoredField(fieldInfo.Name, value)); |
| } |
| |
| public override void StringField(FieldInfo fieldInfo, string value) |
| { |
| FieldType ft = new FieldType(TextField.TYPE_STORED); |
| ft.StoreTermVectors = fieldInfo.HasVectors; |
| ft.IsIndexed = fieldInfo.IsIndexed; |
| ft.OmitNorms = fieldInfo.OmitsNorms; |
| ft.IndexOptions = fieldInfo.IndexOptions; |
| doc.Add(new Field(fieldInfo.Name, value, ft)); |
| } |
| |
| public override void Int32Field(FieldInfo fieldInfo, int value) // LUCENENET specific: renamed from IntField to follow .NET conventions |
| { |
| doc.Add(new StoredField(fieldInfo.Name, value)); |
| } |
| |
| public override void Int64Field(FieldInfo fieldInfo, long value) // LUCENENET specific: renamed from LongField to follow .NET conventions |
| { |
| doc.Add(new StoredField(fieldInfo.Name, value)); |
| } |
| |
| public override void SingleField(FieldInfo fieldInfo, float value) // LUCENENET specific: renamed from FloatField to follow .NET conventions |
| { |
| doc.Add(new StoredField(fieldInfo.Name, value)); |
| } |
| |
| public override void DoubleField(FieldInfo fieldInfo, double value) |
| { |
| doc.Add(new StoredField(fieldInfo.Name, value)); |
| } |
| |
| public override Status NeedsField(FieldInfo fieldInfo) |
| { |
| return fieldsToAdd == null || fieldsToAdd.Contains(fieldInfo.Name) ? Status.YES : Status.NO; |
| } |
| |
| /// <summary> |
| /// Retrieve the visited document. </summary> |
| /// <returns> Document populated with stored fields. Note that only |
| /// the stored information in the field instances is valid, |
| /// data such as boosts, indexing options, term vector options, |
| /// etc is not set. </returns> |
| public virtual Document Document => doc; |
| } |
| } |