| 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. |
| */ |
| |
| // javadocs |
| using BytesRef = Lucene.Net.Util.BytesRef; |
| |
| /// <summary> |
| /// Subclass of <see cref="FilteredTermsEnum"/> for enumerating a single term. |
| /// <para/> |
| /// For example, this can be used by <see cref="Search.MultiTermQuery"/>s |
| /// that need only visit one term, but want to preserve |
| /// <see cref="Search.MultiTermQuery"/> semantics such as <see cref="Search.MultiTermQuery.MultiTermRewriteMethod"/>. |
| /// </summary> |
| public sealed class SingleTermsEnum : FilteredTermsEnum |
| { |
| private readonly BytesRef singleRef; |
| |
| /// <summary> |
| /// Creates a new <see cref="SingleTermsEnum"/>. |
| /// <para/> |
| /// After calling the constructor the enumeration is already pointing to the term, |
| /// if it exists. |
| /// </summary> |
| public SingleTermsEnum(TermsEnum tenum, BytesRef termText) |
| : base(tenum) |
| { |
| singleRef = termText; |
| SetInitialSeekTerm(termText); |
| } |
| |
| protected override AcceptStatus Accept(BytesRef term) |
| { |
| return term.Equals(singleRef) ? AcceptStatus.YES : AcceptStatus.END; |
| } |
| } |
| } |