| /* |
| * 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.Map; |
| import java.util.Set; |
| |
| import org.apache.lucene.index.LeafReaderContext; |
| import org.apache.lucene.queries.function.FunctionValues; |
| import org.apache.lucene.queries.function.ValueSource; |
| import org.apache.lucene.search.Scorable; |
| import org.apache.lucene.util.mutable.MutableValue; |
| |
| /** |
| * A GroupSelector that groups via a ValueSource |
| */ |
| public class ValueSourceGroupSelector extends GroupSelector<MutableValue> { |
| |
| private final ValueSource valueSource; |
| private final Map<?, ?> context; |
| |
| private Set<MutableValue> secondPassGroups; |
| |
| /** |
| * Create a new ValueSourceGroupSelector |
| * @param valueSource the ValueSource to group by |
| * @param context a context map for the ValueSource |
| */ |
| public ValueSourceGroupSelector(ValueSource valueSource, Map<?, ?> context) { |
| this.valueSource = valueSource; |
| this.context = context; |
| } |
| |
| private FunctionValues.ValueFiller filler; |
| |
| @Override |
| public void setNextReader(LeafReaderContext readerContext) throws IOException { |
| FunctionValues values = valueSource.getValues(context, readerContext); |
| this.filler = values.getValueFiller(); |
| } |
| |
| @Override |
| public void setScorer(Scorable scorer) throws IOException { } |
| |
| @Override |
| public State advanceTo(int doc) throws IOException { |
| this.filler.fillValue(doc); |
| if (secondPassGroups != null) { |
| if (secondPassGroups.contains(filler.getValue()) == false) |
| return State.SKIP; |
| } |
| return State.ACCEPT; |
| } |
| |
| @Override |
| public MutableValue currentValue() throws IOException { |
| return filler.getValue(); |
| } |
| |
| @Override |
| public MutableValue copyValue() { |
| return filler.getValue().duplicate(); |
| } |
| |
| @Override |
| public void setGroups(Collection<SearchGroup<MutableValue>> searchGroups) { |
| secondPassGroups = new HashSet<>(); |
| for (SearchGroup<MutableValue> group : searchGroups) { |
| secondPassGroups.add(group.groupValue); |
| } |
| } |
| } |