| using Lucene.Net.Index; |
| using Lucene.Net.Queries.Function; |
| using Lucene.Net.Util.Mutable; |
| using System.Collections; |
| using System.IO; |
| |
| 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> |
| /// Concrete implementation of <see cref="AbstractFirstPassGroupingCollector{TGroupValue}"/> that groups based on |
| /// <see cref="ValueSource"/> instances. |
| /// |
| /// @lucene.experimental |
| /// </summary> |
| public class FunctionFirstPassGroupingCollector : AbstractFirstPassGroupingCollector<MutableValue> |
| { |
| private readonly ValueSource groupByVS; |
| private readonly IDictionary /* Map<?, ?> */ vsContext; |
| |
| private FunctionValues.ValueFiller filler; |
| private MutableValue mval; |
| |
| /// <summary> |
| /// Creates a first pass collector. |
| /// </summary> |
| /// <param name="groupByVS">The <see cref="ValueSource"/> instance to group by</param> |
| /// <param name="vsContext">The <see cref="ValueSource"/> context</param> |
| /// <param name="groupSort"> |
| /// The <see cref="Sort"/> used to sort the |
| /// groups. The top sorted document within each group |
| /// according to groupSort, determines how that group |
| /// sorts against other groups. This must be non-null, |
| /// ie, if you want to groupSort by relevance use |
| /// <see cref="Sort.RELEVANCE"/>. |
| /// </param> |
| /// <param name="topNGroups">How many top groups to keep.</param> |
| /// <exception cref="IOException">When I/O related errors occur</exception> |
| public FunctionFirstPassGroupingCollector(ValueSource groupByVS, IDictionary /* Map<?, ?> */ vsContext, Sort groupSort, int topNGroups) |
| : base(groupSort, topNGroups) |
| { |
| this.groupByVS = groupByVS; |
| this.vsContext = vsContext; |
| } |
| |
| protected override MutableValue GetDocGroupValue(int doc) |
| { |
| filler.FillValue(doc); |
| return mval; |
| } |
| |
| protected override MutableValue CopyDocGroupValue(MutableValue groupValue, MutableValue reuse) |
| { |
| if (reuse != null) |
| { |
| reuse.Copy(groupValue); |
| return reuse; |
| } |
| return groupValue.Duplicate(); |
| } |
| |
| public override void SetNextReader(AtomicReaderContext context) |
| { |
| base.SetNextReader(context); |
| FunctionValues values = groupByVS.GetValues(vsContext, context); |
| filler = values.GetValueFiller(); |
| mval = filler.Value; |
| } |
| } |
| } |