| namespace Lucene.Net.Codecs.Memory |
| { |
| /* |
| * 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. |
| */ |
| |
| using SegmentReadState = Index.SegmentReadState; |
| using SegmentWriteState = Index.SegmentWriteState; |
| using ArrayUtil = Util.ArrayUtil; |
| |
| /// <summary> |
| /// In-memory docvalues format that does no (or very little) |
| /// compression. Indexed values are stored on disk, but |
| /// then at search time all values are loaded into memory as |
| /// simple .NET arrays. For numeric values, it uses |
| /// byte[], short[], int[], long[] as necessary to fit the |
| /// range of the values. For binary values, there is an <see cref="int"/> |
| /// (4 bytes) overhead per value. |
| /// |
| /// <para>Limitations: |
| /// <list type="bullet"> |
| /// <item><description>For binary and sorted fields the total space |
| /// required for all binary values cannot exceed about |
| /// 2.1 GB (see <see cref="MAX_TOTAL_BYTES_LENGTH"/>).</description></item> |
| /// |
| /// <item><description>For sorted set fields, the sum of the size of each |
| /// document's set of values cannot exceed about 2.1 B |
| /// values (see <see cref="MAX_SORTED_SET_ORDS"/>). For example, |
| /// if every document has 10 values (10 instances of |
| /// <see cref="Documents.SortedSetDocValuesField"/>) added, then no |
| /// more than ~210 M documents can be added to one |
| /// segment. </description></item> |
| /// </list> |
| /// </para> |
| /// </summary> |
| [DocValuesFormatName("Direct")] // LUCENENET specific - using DocValuesFormatName attribute to ensure the default name passed from subclasses is the same as this class name |
| public class DirectDocValuesFormat : DocValuesFormat |
| { |
| /// <summary> |
| /// The sum of all byte lengths for binary field, or for |
| /// the unique values in sorted or sorted set fields, cannot |
| /// exceed this. |
| /// </summary> |
| public static readonly int MAX_TOTAL_BYTES_LENGTH = ArrayUtil.MAX_ARRAY_LENGTH; |
| |
| /// <summary> |
| /// The sum of the number of values across all documents |
| /// in a sorted set field cannot exceed this. |
| /// </summary> |
| public static readonly int MAX_SORTED_SET_ORDS = ArrayUtil.MAX_ARRAY_LENGTH; |
| |
| /// <summary> |
| /// Sole constructor. </summary> |
| public DirectDocValuesFormat() |
| : base() |
| { |
| } |
| |
| public override DocValuesConsumer FieldsConsumer(SegmentWriteState state) |
| { |
| return new DirectDocValuesConsumer(state, DATA_CODEC, DATA_EXTENSION, METADATA_CODEC, METADATA_EXTENSION); |
| } |
| |
| public override DocValuesProducer FieldsProducer(SegmentReadState state) |
| { |
| return new DirectDocValuesProducer(state, DATA_CODEC, DATA_EXTENSION, METADATA_CODEC, METADATA_EXTENSION); |
| } |
| |
| internal static readonly string DATA_CODEC = "DirectDocValuesData"; |
| internal static readonly string DATA_EXTENSION = "dvdd"; |
| internal static readonly string METADATA_CODEC = "DirectDocValuesMetadata"; |
| internal static readonly string METADATA_EXTENSION = "dvdm"; |
| } |
| } |