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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.DocValues;
import org.apache.lucene.index.SortedDocValues;
import org.apache.lucene.util.Accountable;
import org.apache.lucene.util.ArrayUtil;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.index.fielddata.AtomicParentChildFieldData;
import org.elasticsearch.index.fielddata.ScriptDocValues;
import org.elasticsearch.index.fielddata.SortedBinaryDocValues;
import java.io.IOException;
import java.util.Collection;
import java.util.Collections;
import java.util.Set;
import static java.util.Collections.emptySet;
abstract class AbstractAtomicParentChildFieldData implements AtomicParentChildFieldData {
@Override
public final ScriptDocValues getScriptValues() {
return new ScriptDocValues.Strings(getBytesValues());
}
@Override
public final SortedBinaryDocValues getBytesValues() {
return new SortedBinaryDocValues() {
private final SortedDocValues[] perTypeValues;
private final BytesRef[] terms = new BytesRef[2];
private int count;
private int termsCursor;
{
Set<String> types = types();
perTypeValues = new SortedDocValues[types.size()];
int i = 0;
for (String type : types) {
perTypeValues[i++] = getOrdinalsValues(type);
}
}
@Override
public boolean advanceExact(int docId) throws IOException {
count = 0;
termsCursor = 0;
for (SortedDocValues values : perTypeValues) {
if (values.advanceExact(docId)) {
final int ord = values.ordValue();
terms[count++] = values.lookupOrd(ord);
}
}
assert count <= 2 : "A single doc can potentially be both parent and child, so the maximum allowed values is 2";
if (count > 1) {
int cmp = terms[0].compareTo(terms[1]);
if (cmp > 0) {
ArrayUtil.swap(terms, 0, 1);
} else if (cmp == 0) {
// If the id is the same between types the only omit one. For example: a doc has parent#1 in _uid field and has grand_parent#1 in _parent field.
count = 1;
}
}
return count != 0;
}
@Override
public int docValueCount() {
return count;
}
@Override
public BytesRef nextValue() throws IOException {
return terms[termsCursor++];
}
};
}
public static AtomicParentChildFieldData empty() {
return new AbstractAtomicParentChildFieldData() {
@Override
public long ramBytesUsed() {
return 0;
}
@Override
public Collection<Accountable> getChildResources() {
return Collections.emptyList();
}
@Override
public void close() {
}
@Override
public SortedDocValues getOrdinalsValues(String type) {
return DocValues.emptySorted();
}
@Override
public Set<String> types() {
return emptySet();
}
};
}
}
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