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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.LeafReaderContext;
import org.apache.lucene.search.SortField;
import org.apache.lucene.search.SortedSetSortField;
import org.apache.lucene.search.SortedSetSelector;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.index.Index;
import org.elasticsearch.index.fielddata.IndexFieldData;
import org.elasticsearch.index.fielddata.fieldcomparator.BytesRefFieldComparatorSource;
import org.elasticsearch.search.MultiValueMode;
public class BinaryDVIndexFieldData extends DocValuesIndexFieldData implements IndexFieldData<BinaryDVAtomicFieldData> {
public BinaryDVIndexFieldData(Index index, String fieldName) {
super(index, fieldName);
}
@Override
public BinaryDVAtomicFieldData load(LeafReaderContext context) {
return new BinaryDVAtomicFieldData(context.reader(), fieldName);
}
@Override
public BinaryDVAtomicFieldData loadDirect(LeafReaderContext context) throws Exception {
return load(context);
}
@Override
public SortField sortField(@Nullable Object missingValue, MultiValueMode sortMode, XFieldComparatorSource.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.sortMissingFirst(missingValue) == false && source.sortMissingLast(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;
}
}