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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.DocValues;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.SortedDocValues;
import org.apache.lucene.index.SortedSetDocValues;
import org.apache.lucene.search.SortField;
import org.apache.lucene.util.Accountable;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.index.IndexSettings;
import org.elasticsearch.index.fielddata.AbstractSortedDocValues;
import org.elasticsearch.index.fielddata.AtomicOrdinalsFieldData;
import org.elasticsearch.index.fielddata.IndexFieldData;
import org.elasticsearch.index.fielddata.IndexFieldDataCache;
import org.elasticsearch.index.fielddata.IndexOrdinalsFieldData;
import org.elasticsearch.index.fielddata.fieldcomparator.BytesRefFieldComparatorSource;
import org.elasticsearch.index.mapper.MappedFieldType;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.mapper.TextFieldMapper;
import org.elasticsearch.indices.breaker.CircuitBreakerService;
import org.elasticsearch.search.MultiValueMode;
import java.io.IOException;
import java.util.Collection;
import java.util.Collections;
import java.util.function.Function;
public class ConstantIndexFieldData extends AbstractIndexOrdinalsFieldData {
public static class Builder implements IndexFieldData.Builder {
private final Function valueFunction;
public Builder(Function valueFunction) {
this.valueFunction = valueFunction;
}
@Override
public IndexFieldData build(IndexSettings indexSettings, MappedFieldType fieldType, IndexFieldDataCache cache,
CircuitBreakerService breakerService, MapperService mapperService) {
return new ConstantIndexFieldData(indexSettings, fieldType.name(), valueFunction.apply(mapperService));
}
}
private static class ConstantAtomicFieldData extends AbstractAtomicOrdinalsFieldData {
private final String value;
ConstantAtomicFieldData(String value) {
super(DEFAULT_SCRIPT_FUNCTION);
this.value = value;
}
@Override
public long ramBytesUsed() {
return 0;
}
@Override
public Collection getChildResources() {
return Collections.emptyList();
}
@Override
public SortedSetDocValues getOrdinalsValues() {
final BytesRef term = new BytesRef(value);
final SortedDocValues sortedValues = new AbstractSortedDocValues() {
private int docID = -1;
@Override
public BytesRef lookupOrd(int ord) {
return term;
}
@Override
public int getValueCount() {
return 1;
}
@Override
public int ordValue() {
return 0;
}
@Override
public boolean advanceExact(int target) throws IOException {
docID = target;
return true;
}
@Override
public int docID() {
return docID;
}
};
return (SortedSetDocValues) DocValues.singleton(sortedValues);
}
@Override
public void close() {
}
}
private final ConstantAtomicFieldData atomicFieldData;
private ConstantIndexFieldData(IndexSettings indexSettings, String name, String value) {
super(indexSettings, name, null, null,
TextFieldMapper.Defaults.FIELDDATA_MIN_FREQUENCY,
TextFieldMapper.Defaults.FIELDDATA_MAX_FREQUENCY,
TextFieldMapper.Defaults.FIELDDATA_MIN_SEGMENT_SIZE);
atomicFieldData = new ConstantAtomicFieldData(value);
}
@Override
public void clear() {
}
@Override
public final AtomicOrdinalsFieldData load(LeafReaderContext context) {
return atomicFieldData;
}
@Override
public AtomicOrdinalsFieldData loadDirect(LeafReaderContext context)
throws Exception {
return atomicFieldData;
}
@Override
public SortField sortField(@Nullable Object missingValue, MultiValueMode sortMode, XFieldComparatorSource.Nested nested,
boolean reverse) {
final XFieldComparatorSource source = new BytesRefFieldComparatorSource(this, missingValue, sortMode, nested);
return new SortField(getFieldName(), source, reverse);
}
@Override
public IndexOrdinalsFieldData loadGlobal(DirectoryReader indexReader) {
return this;
}
@Override
public IndexOrdinalsFieldData localGlobalDirect(DirectoryReader indexReader) throws Exception {
return loadGlobal(indexReader);
}
public String getValue() {
return atomicFieldData.value;
}
}