org.elasticsearch.index.fielddata.plain.NumericDVAtomicFieldData Maven / Gradle / Ivy
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* the Apache License, Version 2.0 (the "License"); you may
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*
* http://www.apache.org/licenses/LICENSE-2.0
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package org.elasticsearch.index.fielddata.plain;
import org.apache.lucene.index.AtomicReader;
import org.apache.lucene.index.NumericDocValues;
import org.apache.lucene.util.Bits;
import org.elasticsearch.ElasticsearchIllegalStateException;
import org.elasticsearch.index.fielddata.AbstractAtomicNumericFieldData;
import org.elasticsearch.index.fielddata.AtomicFieldData;
import org.elasticsearch.index.fielddata.DoubleValues;
import org.elasticsearch.index.fielddata.LongValues;
import java.io.IOException;
/** {@link AtomicFieldData} impl on top of Lucene's numeric doc values. */
public class NumericDVAtomicFieldData extends AbstractAtomicNumericFieldData {
private final AtomicReader reader;
private final String field;
public NumericDVAtomicFieldData(AtomicReader reader, String field) {
super(false);
this.reader = reader;
this.field = field;
}
@Override
public void close() {
// no-op
}
@Override
public boolean isMultiValued() {
return false;
}
@Override
public boolean isValuesOrdered() {
return true; // single-valued
}
@Override
public int getNumDocs() {
return reader.maxDoc();
}
@Override
public long getNumberUniqueValues() {
// good upper limit
return reader.maxDoc();
}
@Override
public long getMemorySizeInBytes() {
// TODO: cannot be computed from Lucene
return -1;
}
private static class DocValuesAndBits {
final NumericDocValues values;
final Bits docsWithField;
DocValuesAndBits(NumericDocValues values, Bits docsWithField) {
super();
this.values = values;
this.docsWithField = docsWithField;
}
}
private DocValuesAndBits getDocValues() {
final NumericDocValues values;
final Bits docsWithField;
try {
final NumericDocValues v = reader.getNumericDocValues(field);
if (v == null) {
// segment has no value
values = NumericDocValues.EMPTY;
docsWithField = new Bits.MatchNoBits(reader.maxDoc());
} else {
values = v;
final Bits b = reader.getDocsWithField(field);
docsWithField = b == null ? new Bits.MatchAllBits(reader.maxDoc()) : b;
}
} catch (IOException e) {
throw new ElasticsearchIllegalStateException("Cannot load doc values", e);
}
return new DocValuesAndBits(values, docsWithField);
}
@Override
public LongValues getLongValues() {
final DocValuesAndBits docValues = getDocValues();
return new LongValues(false) {
@Override
public int setDocument(int docId) {
this.docId = docId;
return docValues.docsWithField.get(docId) ? 1 : 0;
}
@Override
public long nextValue() {
return docValues.values.get(docId);
}
};
}
@Override
public DoubleValues getDoubleValues() {
final DocValuesAndBits docValues = getDocValues();
return new DoubleValues(false) {
@Override
public int setDocument(int docId) {
this.docId = docId;
return docValues.docsWithField.get(docId) ? 1 : 0;
}
@Override
public double nextValue() {
return docValues.values.get(docId);
}
};
}
}