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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.ordinals;
import org.apache.lucene.index.DocValues;
import org.apache.lucene.index.RandomAccessOrds;
import org.apache.lucene.index.SortedDocValues;
import org.apache.lucene.util.Accountable;
import org.apache.lucene.util.Accountables;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.RamUsageEstimator;
import org.apache.lucene.util.packed.PackedInts;
import java.util.Collection;
import java.util.Collections;
/**
*/
public class SinglePackedOrdinals extends Ordinals {
// ordinals with value 0 indicates no value
private final PackedInts.Reader reader;
private final int valueCount;
public SinglePackedOrdinals(OrdinalsBuilder builder, float acceptableOverheadRatio) {
assert builder.getNumMultiValuesDocs() == 0;
this.valueCount = (int) builder.getValueCount();
// We don't reuse the builder as-is because it might have been built with a higher overhead ratio
final PackedInts.Mutable reader = PackedInts.getMutable(builder.maxDoc(), PackedInts.bitsRequired(valueCount), acceptableOverheadRatio);
PackedInts.copy(builder.getFirstOrdinals(), 0, reader, 0, builder.maxDoc(), 8 * 1024);
this.reader = reader;
}
@Override
public long ramBytesUsed() {
return RamUsageEstimator.NUM_BYTES_OBJECT_REF + reader.ramBytesUsed();
}
@Override
public Collection getChildResources() {
return Collections.singleton(Accountables.namedAccountable("reader", reader));
}
@Override
public RandomAccessOrds ordinals(ValuesHolder values) {
return (RandomAccessOrds) DocValues.singleton(new Docs(this, values));
}
private static class Docs extends SortedDocValues {
private final int maxOrd;
private final PackedInts.Reader reader;
private final ValuesHolder values;
public Docs(SinglePackedOrdinals parent, ValuesHolder values) {
this.maxOrd = parent.valueCount;
this.reader = parent.reader;
this.values = values;
}
@Override
public int getValueCount() {
return maxOrd;
}
@Override
public BytesRef lookupOrd(int ord) {
return values.lookupOrd(ord);
}
@Override
public int getOrd(int docID) {
return (int) (reader.get(docID) - 1);
}
}
}