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Make the fetch fields phase easier to test. (#55756)
This commit pulls out a FieldValueRetriever object, which retrieves specific fields given a document's source. The new object makes it easier to unit test the logic, and will help keep FetchFieldsPhase from growing too complex as we add more functionality.
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server/src/main/java/org/elasticsearch/search/fetch/subphase/FieldValueRetriever.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,87 @@ | ||
| /* | ||
| * Licensed to Elasticsearch under one or more contributor | ||
| * license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright | ||
| * ownership. Elasticsearch 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. | ||
| */ | ||
|
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| package org.elasticsearch.search.fetch.subphase; | ||
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| import org.elasticsearch.common.document.DocumentField; | ||
| import org.elasticsearch.common.xcontent.support.XContentMapValues; | ||
| import org.elasticsearch.index.mapper.DocumentMapper; | ||
| import org.elasticsearch.index.mapper.MapperService; | ||
| import org.elasticsearch.search.lookup.SourceLookup; | ||
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|
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| import java.util.Collection; | ||
| import java.util.HashMap; | ||
| import java.util.HashSet; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Set; | ||
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| public class FieldValueRetriever { | ||
| private final Set<String> fields; | ||
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| public static FieldValueRetriever create(MapperService mapperService, | ||
| Collection<String> fieldPatterns) { | ||
| Set<String> fields = new HashSet<>(); | ||
| DocumentMapper documentMapper = mapperService.documentMapper(); | ||
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| for (String fieldPattern : fieldPatterns) { | ||
| if (documentMapper.objectMappers().containsKey(fieldPattern)) { | ||
| continue; | ||
| } | ||
| Collection<String> concreteFields = mapperService.simpleMatchToFullName(fieldPattern); | ||
| fields.addAll(concreteFields); | ||
| } | ||
| return new FieldValueRetriever(fields); | ||
| } | ||
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| private FieldValueRetriever(Set<String> fields) { | ||
| this.fields = fields; | ||
| } | ||
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| @SuppressWarnings("unchecked") | ||
| public Map<String, DocumentField> retrieve(SourceLookup sourceLookup) { | ||
| Map<String, DocumentField> result = new HashMap<>(); | ||
| Map<String, Object> sourceValues = extractValues(sourceLookup, this.fields); | ||
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| for (Map.Entry<String, Object> entry : sourceValues.entrySet()) { | ||
| String field = entry.getKey(); | ||
| Object value = entry.getValue(); | ||
| List<Object> values = value instanceof List | ||
| ? (List<Object>) value | ||
| : List.of(value); | ||
| result.put(field, new DocumentField(field, values)); | ||
| } | ||
| return result; | ||
| } | ||
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| /** | ||
| * For each of the provided paths, return its value in the source. Note that in contrast with | ||
| * {@link SourceLookup#extractRawValues}, array and object values can be returned. | ||
| */ | ||
| private static Map<String, Object> extractValues(SourceLookup sourceLookup, Collection<String> paths) { | ||
| Map<String, Object> result = new HashMap<>(paths.size()); | ||
| for (String path : paths) { | ||
| Object value = XContentMapValues.extractValue(path, sourceLookup); | ||
| if (value != null) { | ||
| result.put(path, value); | ||
| } | ||
| } | ||
| return result; | ||
| } | ||
| } |
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