| /* |
| * 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.luke.models.documents; |
| |
| import java.io.IOException; |
| import java.lang.invoke.MethodHandles; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Objects; |
| |
| import org.apache.logging.log4j.Logger; |
| import org.apache.lucene.index.IndexReader; |
| import org.apache.lucene.index.Terms; |
| import org.apache.lucene.index.TermsEnum; |
| import org.apache.lucene.luke.util.LoggerFactory; |
| |
| /** |
| * An utility class to access to the term vectors. |
| */ |
| final class TermVectorsAdapter { |
| |
| private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass()); |
| |
| private IndexReader reader; |
| |
| TermVectorsAdapter(IndexReader reader) { |
| this.reader = Objects.requireNonNull(reader); |
| } |
| |
| /** |
| * Returns the term vectors for the specified field in the specified document. |
| * If no term vector is available for the field, empty list is returned. |
| * |
| * @param docid - document id |
| * @param field - field name |
| * @return list of term vector elements |
| * @throws IOException - if there is a low level IO error. |
| */ |
| List<TermVectorEntry> getTermVector(int docid, String field) throws IOException { |
| Terms termVector = reader.getTermVector(docid, field); |
| if (termVector == null) { |
| // no term vector available |
| log.warn("No term vector indexed for doc: #{} and field: {}", docid, field); |
| return Collections.emptyList(); |
| } |
| |
| List<TermVectorEntry> res = new ArrayList<>(); |
| TermsEnum te = termVector.iterator(); |
| while (te.next() != null) { |
| res.add(TermVectorEntry.of(te)); |
| } |
| return res; |
| } |
| |
| } |