| using Lucene.Net.Index; |
| using Lucene.Net.Search; |
| using Lucene.Net.Util; |
| using System; |
| |
| namespace Lucene.Net.Queries |
| { |
| /* |
| * 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 filter that includes documents that match with a specific term. |
| /// </summary> |
| public sealed class TermFilter : Filter |
| { |
| private readonly Term term; |
| |
| /// <param name="term"> The term documents need to have in order to be a match for this filter. </param> |
| public TermFilter(Term term) |
| { |
| if (term == null) |
| { |
| throw new ArgumentException("Term must not be null"); |
| } |
| else if (term.Field == null) |
| { |
| throw new ArgumentException("Field must not be null"); |
| } |
| this.term = term; |
| } |
| |
| /// <summary> Gets the term this filter includes documents with. </summary> |
| public Term Term => term; |
| |
| public override DocIdSet GetDocIdSet(AtomicReaderContext context, IBits acceptDocs) |
| { |
| Terms terms = context.AtomicReader.GetTerms(term.Field); |
| if (terms == null) |
| { |
| return null; |
| } |
| |
| TermsEnum termsEnum = terms.GetEnumerator(); |
| if (!termsEnum.SeekExact(term.Bytes)) |
| { |
| return null; |
| } |
| return new DocIdSetAnonymousInnerClassHelper(acceptDocs, termsEnum); |
| } |
| |
| private class DocIdSetAnonymousInnerClassHelper : DocIdSet |
| { |
| private readonly IBits acceptDocs; |
| private readonly TermsEnum termsEnum; |
| |
| public DocIdSetAnonymousInnerClassHelper(IBits acceptDocs, TermsEnum termsEnum) |
| { |
| this.acceptDocs = acceptDocs; |
| this.termsEnum = termsEnum; |
| } |
| |
| public override DocIdSetIterator GetIterator() |
| { |
| return termsEnum.Docs(acceptDocs, null, DocsFlags.NONE); |
| } |
| } |
| |
| public override bool Equals(object o) |
| { |
| if (this == o) |
| { |
| return true; |
| } |
| if (o == null || this.GetType() != o.GetType()) |
| { |
| return false; |
| } |
| |
| TermFilter that = (TermFilter)o; |
| |
| if (term != null ? !term.Equals(that.term) : that.term != null) |
| { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| public override int GetHashCode() |
| { |
| return term != null ? term.GetHashCode() : 0; |
| } |
| |
| public override string ToString() |
| { |
| return term.Field + ":" + term.Text(); |
| } |
| } |
| } |