org.elasticsearch.index.fielddata.fieldcomparator.ByteValuesComparatorSource Maven / Gradle / Ivy
/*
* Licensed to ElasticSearch and Shay Banon under one
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* 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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.index.fielddata.fieldcomparator;
import org.apache.lucene.search.FieldComparator;
import org.apache.lucene.search.SortField;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.index.fielddata.IndexFieldData;
import org.elasticsearch.index.fielddata.IndexNumericFieldData;
import java.io.IOException;
/**
*/
public class ByteValuesComparatorSource extends IndexFieldData.XFieldComparatorSource {
private final IndexNumericFieldData indexFieldData;
private final Object missingValue;
private final SortMode sortMode;
public ByteValuesComparatorSource(IndexNumericFieldData indexFieldData, @Nullable Object missingValue, SortMode sortMode) {
this.indexFieldData = indexFieldData;
this.missingValue = missingValue;
this.sortMode = sortMode;
}
@Override
public SortField.Type reducedType() {
return SortField.Type.INT;
}
@Override
public FieldComparator newComparator(String fieldname, int numHits, int sortPos, boolean reversed) throws IOException {
assert fieldname.equals(indexFieldData.getFieldNames().indexName());
byte dMissingValue;
if (missingValue == null || "_last".equals(missingValue)) {
dMissingValue = reversed ? Byte.MIN_VALUE : Byte.MAX_VALUE;
} else if ("_first".equals(missingValue)) {
dMissingValue = reversed ? Byte.MAX_VALUE : Byte.MIN_VALUE;
} else {
dMissingValue = missingValue instanceof Number ? ((Number) missingValue).byteValue() : Byte.parseByte(missingValue.toString());
}
return new ByteValuesComparator(indexFieldData, dMissingValue, numHits, sortMode);
}
}