| using System; |
| |
| namespace Lucene.Net.Search |
| { |
| /* |
| * 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> |
| /// Abstract decorator class of a <see cref="DocIdSetIterator"/> |
| /// implementation that provides on-demand filter/validation |
| /// mechanism on an underlying <see cref="DocIdSetIterator"/>. See |
| /// <see cref="DocIdSetIterator"/>. |
| /// </summary> |
| public abstract class FilteredDocIdSetIterator : DocIdSetIterator |
| { |
| protected DocIdSetIterator m_innerIter; |
| private int doc; |
| |
| /// <summary> |
| /// Constructor. </summary> |
| /// <param name="innerIter"> Underlying <see cref="DocIdSetIterator"/>. </param> |
| public FilteredDocIdSetIterator(DocIdSetIterator innerIter) |
| { |
| m_innerIter = innerIter ?? throw new ArgumentNullException(nameof(innerIter), "null iterator"); |
| doc = -1; |
| } |
| |
| /// <summary> |
| /// Validation method to determine whether a docid should be in the result set. </summary> |
| /// <param name="doc"> docid to be tested </param> |
| /// <returns> <c>true</c> if input docid should be in the result set, <c>false</c> otherwise. </returns> |
| /// <seealso cref="FilteredDocIdSetIterator(DocIdSetIterator)"/> |
| protected abstract bool Match(int doc); |
| |
| public override int DocID => doc; |
| |
| public override int NextDoc() |
| { |
| while ((doc = m_innerIter.NextDoc()) != NO_MORE_DOCS) |
| { |
| if (Match(doc)) |
| { |
| return doc; |
| } |
| } |
| return doc; |
| } |
| |
| public override int Advance(int target) |
| { |
| doc = m_innerIter.Advance(target); |
| if (doc != NO_MORE_DOCS) |
| { |
| if (Match(doc)) |
| { |
| return doc; |
| } |
| else |
| { |
| while ((doc = m_innerIter.NextDoc()) != NO_MORE_DOCS) |
| { |
| if (Match(doc)) |
| { |
| return doc; |
| } |
| } |
| return doc; |
| } |
| } |
| return doc; |
| } |
| |
| public override long GetCost() |
| { |
| return m_innerIter.GetCost(); |
| } |
| } |
| } |