| using Lucene.Net.Index; |
| using Lucene.Net.Queries.Function; |
| using Lucene.Net.Util.Mutable; |
| using System.Collections; |
| using System.Collections.Generic; |
| using JCG = J2N.Collections.Generic; |
| |
| namespace Lucene.Net.Search.Grouping.Function |
| { |
| /* |
| * 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 collector that collects all groups that match the |
| /// query. Only the group value is collected, and the order |
| /// is undefined. This collector does not determine |
| /// the most relevant document of a group. |
| /// |
| /// <para> |
| /// Implementation detail: Uses <see cref="ValueSource"/> and <see cref="FunctionValues"/> to retrieve the |
| /// field values to group by. |
| /// </para> |
| /// @lucene.experimental |
| /// </summary> |
| public class FunctionAllGroupsCollector : AbstractAllGroupsCollector<MutableValue> |
| { |
| private readonly IDictionary /* Map<?, ?> */ vsContext; |
| private readonly ValueSource groupBy; |
| private readonly ISet<MutableValue> groups = new JCG.SortedSet<MutableValue>(); |
| |
| private FunctionValues.ValueFiller filler; |
| private MutableValue mval; |
| |
| /// <summary> |
| /// Constructs a <see cref="FunctionAllGroupsCollector"/> instance. |
| /// </summary> |
| /// <param name="groupBy">The <see cref="ValueSource"/> to group by</param> |
| /// <param name="vsContext">The <see cref="ValueSource"/> context</param> |
| public FunctionAllGroupsCollector(ValueSource groupBy, IDictionary /* Map<?, ?> */ vsContext) |
| { |
| this.vsContext = vsContext; |
| this.groupBy = groupBy; |
| } |
| |
| public override IEnumerable<MutableValue> Groups => groups; |
| |
| public override void Collect(int doc) |
| { |
| filler.FillValue(doc); |
| if (!groups.Contains(mval)) |
| { |
| groups.Add(mval.Duplicate()); |
| } |
| } |
| |
| public override void SetNextReader(AtomicReaderContext context) |
| { |
| FunctionValues values = groupBy.GetValues(vsContext, context); |
| filler = values.GetValueFiller(); |
| mval = filler.Value; |
| } |
| } |
| } |