| /* |
| * 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. |
| */ |
| |
| package org.apache.lucene.search.grouping; |
| |
| import java.io.IOException; |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.apache.lucene.index.LeafReaderContext; |
| import org.apache.lucene.search.DoubleValuesSource; |
| import org.apache.lucene.search.LongValues; |
| import org.apache.lucene.search.LongValuesSource; |
| import org.apache.lucene.search.Scorable; |
| |
| /** |
| * A GroupSelector implementation that groups documents by long values |
| */ |
| public class LongRangeGroupSelector extends GroupSelector<LongRange> { |
| |
| private final LongValuesSource source; |
| private final LongRangeFactory rangeFactory; |
| |
| private Set<LongRange> inSecondPass; |
| private boolean includeEmpty = true; |
| private boolean positioned; |
| private LongRange current; |
| |
| private LeafReaderContext context; |
| private LongValues values; |
| |
| /** |
| * Creates a new LongRangeGroupSelector |
| * @param source a LongValuesSource to retrieve long values per document |
| * @param rangeFactory a LongRangeFactory that defines how to group the long values into range buckets |
| */ |
| public LongRangeGroupSelector(LongValuesSource source, LongRangeFactory rangeFactory) { |
| this.source = source; |
| this.rangeFactory = rangeFactory; |
| } |
| |
| @Override |
| public void setNextReader(LeafReaderContext readerContext) throws IOException { |
| this.context = readerContext; |
| } |
| |
| @Override |
| public void setScorer(Scorable scorer) throws IOException { |
| this.values = source.getValues(context, DoubleValuesSource.fromScorer(scorer)); |
| } |
| |
| @Override |
| public State advanceTo(int doc) throws IOException { |
| positioned = values.advanceExact(doc); |
| if (positioned == false) { |
| return includeEmpty ? State.ACCEPT : State.SKIP; |
| } |
| this.current = rangeFactory.getRange(values.longValue(), this.current); |
| if (inSecondPass == null) { |
| return State.ACCEPT; |
| } |
| return inSecondPass.contains(this.current) ? State.ACCEPT : State.SKIP; |
| } |
| |
| @Override |
| public LongRange currentValue() throws IOException { |
| return positioned ? this.current : null; |
| } |
| |
| @Override |
| public LongRange copyValue() throws IOException { |
| return positioned ? new LongRange(this.current.min, this.current.max) : null; |
| } |
| |
| @Override |
| public void setGroups(Collection<SearchGroup<LongRange>> searchGroups) { |
| inSecondPass = new HashSet<>(); |
| includeEmpty = false; |
| for (SearchGroup<LongRange> group : searchGroups) { |
| if (group.groupValue == null) |
| includeEmpty = true; |
| else |
| inSecondPass.add(group.groupValue); |
| } |
| } |
| } |