| using Lucene.Net.Diagnostics; |
| |
| namespace Lucene.Net.Index |
| { |
| /* |
| * 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 BytesRef = Lucene.Net.Util.BytesRef; |
| |
| /// <summary> |
| /// Exposes multi-valued view over a single-valued instance. |
| /// <para/> |
| /// This can be used if you want to have one multi-valued implementation |
| /// against e.g. <see cref="Search.IFieldCache.GetDocTermOrds(AtomicReader, string)"/> that also works for single-valued |
| /// fields. |
| /// </summary> |
| internal sealed class SingletonSortedSetDocValues : SortedSetDocValues |
| { |
| private readonly SortedDocValues @in; |
| private int docID; |
| private bool set; |
| |
| /// <summary> |
| /// Creates a multi-valued view over the provided <see cref="Index.SortedDocValues"/> </summary> |
| public SingletonSortedSetDocValues(SortedDocValues @in) |
| { |
| this.@in = @in; |
| if (Debugging.AssertsEnabled) Debugging.Assert(NO_MORE_ORDS == -1); // this allows our nextOrd() to work for missing values without a check |
| } |
| |
| /// <summary> |
| /// Return the wrapped <see cref="Index.SortedDocValues"/> </summary> |
| public SortedDocValues SortedDocValues => @in; |
| |
| public override long NextOrd() |
| { |
| if (set) |
| { |
| return NO_MORE_ORDS; |
| } |
| else |
| { |
| set = true; |
| return @in.GetOrd(docID); |
| } |
| } |
| |
| public override void SetDocument(int docID) |
| { |
| this.docID = docID; |
| set = false; |
| } |
| |
| public override void LookupOrd(long ord, BytesRef result) |
| { |
| // cast is ok: single-valued cannot exceed Integer.MAX_VALUE |
| @in.LookupOrd((int)ord, result); |
| } |
| |
| public override long ValueCount => @in.ValueCount; |
| |
| public override long LookupTerm(BytesRef key) |
| { |
| return @in.LookupTerm(key); |
| } |
| } |
| } |