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/*
* Licensed to ElasticSearch and Shay Banon 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.
*/
package org.elasticsearch.search.fetch;
import com.google.common.collect.ImmutableMap;
import org.apache.lucene.index.AtomicReaderContext;
import org.apache.lucene.index.ReaderUtil;
import org.elasticsearch.common.bytes.BytesArray;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.text.StringAndBytesText;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.index.fieldvisitor.CustomFieldsVisitor;
import org.elasticsearch.index.fieldvisitor.FieldsVisitor;
import org.elasticsearch.index.fieldvisitor.JustUidFieldsVisitor;
import org.elasticsearch.index.fieldvisitor.UidAndSourceFieldsVisitor;
import org.elasticsearch.index.mapper.DocumentMapper;
import org.elasticsearch.index.mapper.FieldMappers;
import org.elasticsearch.index.mapper.internal.SourceFieldMapper;
import org.elasticsearch.search.SearchHitField;
import org.elasticsearch.search.SearchParseElement;
import org.elasticsearch.search.SearchPhase;
import org.elasticsearch.search.fetch.explain.ExplainFetchSubPhase;
import org.elasticsearch.search.fetch.matchedfilters.MatchedFiltersFetchSubPhase;
import org.elasticsearch.search.fetch.partial.PartialFieldsFetchSubPhase;
import org.elasticsearch.search.fetch.script.ScriptFieldsFetchSubPhase;
import org.elasticsearch.search.fetch.version.VersionFetchSubPhase;
import org.elasticsearch.search.highlight.HighlightPhase;
import org.elasticsearch.search.internal.InternalSearchHit;
import org.elasticsearch.search.internal.InternalSearchHitField;
import org.elasticsearch.search.internal.InternalSearchHits;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.*;
import static com.google.common.collect.Lists.newArrayList;
/**
*
*/
public class FetchPhase implements SearchPhase {
private final FetchSubPhase[] fetchSubPhases;
@Inject
public FetchPhase(HighlightPhase highlightPhase, ScriptFieldsFetchSubPhase scriptFieldsPhase, PartialFieldsFetchSubPhase partialFieldsPhase,
MatchedFiltersFetchSubPhase matchFiltersPhase, ExplainFetchSubPhase explainPhase, VersionFetchSubPhase versionPhase) {
this.fetchSubPhases = new FetchSubPhase[]{scriptFieldsPhase, partialFieldsPhase, matchFiltersPhase, explainPhase, highlightPhase, versionPhase};
}
@Override
public Map parseElements() {
ImmutableMap.Builder parseElements = ImmutableMap.builder();
parseElements.put("fields", new FieldsParseElement());
for (FetchSubPhase fetchSubPhase : fetchSubPhases) {
parseElements.putAll(fetchSubPhase.parseElements());
}
return parseElements.build();
}
@Override
public void preProcess(SearchContext context) {
}
public void execute(SearchContext context) {
FieldsVisitor fieldsVisitor;
List extractFieldNames = null;
boolean sourceRequested = false;
if (!context.hasFieldNames()) {
if (context.hasPartialFields()) {
// partial fields need the source, so fetch it, but don't return it
fieldsVisitor = new UidAndSourceFieldsVisitor();
} else if (context.hasScriptFields()) {
// we ask for script fields, and no field names, don't load the source
fieldsVisitor = new JustUidFieldsVisitor();
} else {
sourceRequested = true;
fieldsVisitor = new UidAndSourceFieldsVisitor();
}
} else if (context.fieldNames().isEmpty()) {
fieldsVisitor = new JustUidFieldsVisitor();
} else {
boolean loadAllStored = false;
Set fieldNames = null;
for (String fieldName : context.fieldNames()) {
if (fieldName.equals("*")) {
loadAllStored = true;
continue;
}
if (fieldName.equals(SourceFieldMapper.NAME)) {
sourceRequested = true;
continue;
}
FieldMappers x = context.smartNameFieldMappers(fieldName);
if (x != null && x.mapper().fieldType().stored()) {
if (fieldNames == null) {
fieldNames = new HashSet();
}
fieldNames.add(x.mapper().names().indexName());
} else {
if (extractFieldNames == null) {
extractFieldNames = newArrayList();
}
extractFieldNames.add(fieldName);
}
}
if (loadAllStored) {
if (sourceRequested || extractFieldNames != null) {
fieldsVisitor = new CustomFieldsVisitor(true, true); // load everything, including _source
} else {
fieldsVisitor = new CustomFieldsVisitor(true, false);
}
} else if (fieldNames != null) {
boolean loadSource = extractFieldNames != null || sourceRequested;
fieldsVisitor = new CustomFieldsVisitor(fieldNames, loadSource);
} else if (extractFieldNames != null || sourceRequested) {
fieldsVisitor = new UidAndSourceFieldsVisitor();
} else {
fieldsVisitor = new JustUidFieldsVisitor();
}
}
InternalSearchHit[] hits = new InternalSearchHit[context.docIdsToLoadSize()];
for (int index = 0; index < context.docIdsToLoadSize(); index++) {
int docId = context.docIdsToLoad()[context.docIdsToLoadFrom() + index];
loadStoredFields(context, fieldsVisitor, docId);
fieldsVisitor.postProcess(context.mapperService());
Map searchFields = null;
if (!fieldsVisitor.fields().isEmpty()) {
searchFields = new HashMap(fieldsVisitor.fields().size());
for (Map.Entry> entry : fieldsVisitor.fields().entrySet()) {
searchFields.put(entry.getKey(), new InternalSearchHitField(entry.getKey(), entry.getValue()));
}
}
DocumentMapper documentMapper = context.mapperService().documentMapper(fieldsVisitor.uid().type());
Text typeText;
if (documentMapper == null) {
typeText = new StringAndBytesText(fieldsVisitor.uid().type());
} else {
typeText = documentMapper.typeText();
}
InternalSearchHit searchHit = new InternalSearchHit(docId, fieldsVisitor.uid().id(), typeText, sourceRequested ? fieldsVisitor.source() : null, searchFields);
hits[index] = searchHit;
int readerIndex = ReaderUtil.subIndex(docId, context.searcher().getIndexReader().leaves());
AtomicReaderContext subReaderContext = context.searcher().getIndexReader().leaves().get(readerIndex);
int subDoc = docId - subReaderContext.docBase;
// go over and extract fields that are not mapped / stored
context.lookup().setNextReader(subReaderContext);
context.lookup().setNextDocId(subDoc);
if (searchHit.source() != null) {
context.lookup().source().setNextSource(new BytesArray(searchHit.source()));
}
if (extractFieldNames != null) {
for (String extractFieldName : extractFieldNames) {
Object value = context.lookup().source().extractValue(extractFieldName);
if (value != null) {
if (searchHit.fieldsOrNull() == null) {
searchHit.fields(new HashMap(2));
}
SearchHitField hitField = searchHit.fields().get(extractFieldName);
if (hitField == null) {
hitField = new InternalSearchHitField(extractFieldName, new ArrayList
