| /* |
| * 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.join; |
| |
| import java.io.IOException; |
| |
| import org.apache.lucene.index.BinaryDocValues; |
| import org.apache.lucene.index.DocValues; |
| import org.apache.lucene.index.LeafReader; |
| import org.apache.lucene.index.LeafReaderContext; |
| import org.apache.lucene.index.SortedSetDocValues; |
| import org.apache.lucene.search.SimpleCollector; |
| |
| abstract class DocValuesTermsCollector<DV> extends SimpleCollector { |
| |
| @FunctionalInterface |
| static interface Function<R> { |
| R apply(LeafReader t) throws IOException; |
| } |
| |
| protected DV docValues; |
| private final Function<DV> docValuesCall; |
| |
| public DocValuesTermsCollector(Function<DV> docValuesCall) { |
| this.docValuesCall = docValuesCall; |
| } |
| |
| @Override |
| protected final void doSetNextReader(LeafReaderContext context) throws IOException { |
| docValues = docValuesCall.apply(context.reader()); |
| } |
| |
| static Function<BinaryDocValues> binaryDocValues(String field) { |
| return (ctx) -> DocValues.getBinary(ctx, field); |
| } |
| |
| static Function<SortedSetDocValues> sortedSetDocValues(String field) { |
| return (ctx) -> DocValues.getSortedSet(ctx, field); |
| } |
| } |