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/*
* 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.
*/
package org.elasticsearch.index.fielddata.plain;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.RandomAccessOrds;
import org.apache.lucene.search.SortField;
import org.apache.lucene.search.SortedSetSortField;
import org.apache.lucene.search.SortedSetSelector;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.index.IndexSettings;
import org.elasticsearch.index.fielddata.AtomicOrdinalsFieldData;
import org.elasticsearch.index.fielddata.IndexFieldData.XFieldComparatorSource.Nested;
import org.elasticsearch.index.fielddata.IndexFieldDataCache;
import org.elasticsearch.index.fielddata.IndexOrdinalsFieldData;
import org.elasticsearch.index.fielddata.ScriptDocValues;
import org.elasticsearch.index.fielddata.fieldcomparator.BytesRefFieldComparatorSource;
import org.elasticsearch.index.fielddata.ordinals.GlobalOrdinalsBuilder;
import org.elasticsearch.indices.breaker.CircuitBreakerService;
import org.elasticsearch.search.MultiValueMode;
import java.io.IOException;
import java.util.function.Function;
public class SortedSetDVOrdinalsIndexFieldData extends DocValuesIndexFieldData implements IndexOrdinalsFieldData {
private final IndexSettings indexSettings;
private final IndexFieldDataCache cache;
private final CircuitBreakerService breakerService;
private final Function<RandomAccessOrds, ScriptDocValues<?>> scriptFunction;
public SortedSetDVOrdinalsIndexFieldData(IndexSettings indexSettings, IndexFieldDataCache cache, String fieldName,
CircuitBreakerService breakerService, Function<RandomAccessOrds, ScriptDocValues<?>> scriptFunction) {
super(indexSettings.getIndex(), fieldName);
this.indexSettings = indexSettings;
this.cache = cache;
this.breakerService = breakerService;
this.scriptFunction = scriptFunction;
}
@Override
public SortField sortField(@Nullable Object missingValue, MultiValueMode sortMode, Nested nested, boolean reverse) {
XFieldComparatorSource source = new BytesRefFieldComparatorSource(this, missingValue, sortMode, nested);
/**
* Check if we can use a simple {@link SortedSetSortField} compatible with index sorting and
* returns a custom sort field otherwise.
*/
if (nested != null ||
(sortMode != MultiValueMode.MAX && sortMode != MultiValueMode.MIN) ||
(source.sortMissingLast(missingValue) == false && source.sortMissingFirst(missingValue) == false)) {
return new SortField(getFieldName(), source, reverse);
}
SortField sortField = new SortedSetSortField(fieldName, reverse,
sortMode == MultiValueMode.MAX ? SortedSetSelector.Type.MAX : SortedSetSelector.Type.MIN);
sortField.setMissingValue(source.sortMissingLast(missingValue) ^ reverse ?
SortedSetSortField.STRING_LAST : SortedSetSortField.STRING_FIRST);
return sortField;
}
@Override
public AtomicOrdinalsFieldData load(LeafReaderContext context) {
return new SortedSetDVBytesAtomicFieldData(context.reader(), fieldName, scriptFunction);
}
@Override
public AtomicOrdinalsFieldData loadDirect(LeafReaderContext context) throws Exception {
return load(context);
}
@Override
public IndexOrdinalsFieldData loadGlobal(DirectoryReader indexReader) {
if (indexReader.leaves().size() <= 1) {
// ordinals are already global
return this;
}
boolean fieldFound = false;
for (LeafReaderContext context : indexReader.leaves()) {
if (context.reader().getFieldInfos().fieldInfo(getFieldName()) != null) {
fieldFound = true;
break;
}
}
if (fieldFound == false) {
// Some directory readers may be wrapped and report different set of fields and use the same cache key.
// If a field can't be found then it doesn't mean it isn't there,
// so if a field doesn't exist then we don't cache it and just return an empty field data instance.
// The next time the field is found, we do cache.
try {
return GlobalOrdinalsBuilder.buildEmpty(indexSettings, indexReader, this);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
try {
return cache.load(indexReader, this);
} catch (Exception e) {
if (e instanceof ElasticsearchException) {
throw (ElasticsearchException) e;
} else {
throw new ElasticsearchException(e);
}
}
}
@Override
public IndexOrdinalsFieldData localGlobalDirect(DirectoryReader indexReader) throws Exception {
return GlobalOrdinalsBuilder.build(indexReader, this, indexSettings, breakerService, logger, scriptFunction);
}
}
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