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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.apache.lucene.search.grouping;
import org.apache.lucene.index.DocValues;
import org.apache.lucene.index.DocValuesType;
import org.apache.lucene.index.FieldInfo;
import org.apache.lucene.index.LeafReader;
import org.apache.lucene.index.NumericDocValues;
import org.apache.lucene.index.SortedDocValues;
import org.apache.lucene.index.SortedNumericDocValues;
import org.apache.lucene.index.SortedSetDocValues;
import org.apache.lucene.util.ArrayUtil;
import org.apache.lucene.util.Bits;
import org.apache.lucene.util.BytesRef;
import java.io.IOException;
/**
* Utility class that ensures that a single collapse key is extracted per document.
*/
abstract class CollapsingDocValuesSource<T> {
protected final String field;
CollapsingDocValuesSource(String field) throws IOException {
this.field = field;
}
abstract T get(int doc);
abstract T copy(T value, T reuse);
abstract void setNextReader(LeafReader reader) throws IOException;
/**
* Implementation for {@link NumericDocValues} and {@link SortedNumericDocValues}.
* Fails with an {@link IllegalStateException} if a document contains multiple values for the specified field.
*/
static class Numeric extends CollapsingDocValuesSource<Long> {
private NumericDocValues values;
private Bits docsWithField;
Numeric(String field) throws IOException {
super(field);
}
@Override
public Long get(int doc) {
if (docsWithField.get(doc)) {
return values.get(doc);
} else {
return null;
}
}
@Override
public Long copy(Long value, Long reuse) {
return value;
}
@Override
public void setNextReader(LeafReader reader) throws IOException {
DocValuesType type = getDocValuesType(reader, field);
if (type == null || type == DocValuesType.NONE) {
values = DocValues.emptyNumeric();
docsWithField = new Bits.MatchNoBits(reader.maxDoc());
return ;
}
docsWithField = DocValues.getDocsWithField(reader, field);
switch (type) {
case NUMERIC:
values = DocValues.getNumeric(reader, field);
break;
case SORTED_NUMERIC:
final SortedNumericDocValues sorted = DocValues.getSortedNumeric(reader, field);
values = DocValues.unwrapSingleton(sorted);
if (values == null) {
values = new NumericDocValues() {
@Override
public long get(int docID) {
sorted.setDocument(docID);
assert sorted.count() > 0;
if (sorted.count() > 1) {
throw new IllegalStateException("failed to collapse " + docID +
", the collapse field must be single valued");
}
return sorted.valueAt(0);
}
};
}
break;
default:
throw new IllegalStateException("unexpected doc values type " +
type + "` for field `" + field + "`");
}
}
}
/**
* Implementation for {@link SortedDocValues} and {@link SortedSetDocValues}.
* Fails with an {@link IllegalStateException} if a document contains multiple values for the specified field.
*/
static class Keyword extends CollapsingDocValuesSource<BytesRef> {
private Bits docsWithField;
private SortedDocValues values;
Keyword(String field) throws IOException {
super(field);
}
@Override
public BytesRef get(int doc) {
if (docsWithField.get(doc)) {
return values.get(doc);
} else {
return null;
}
}
@Override
public BytesRef copy(BytesRef value, BytesRef reuse) {
if (value == null) {
return null;
}
if (reuse != null) {
reuse.bytes = ArrayUtil.grow(reuse.bytes, value.length);
reuse.offset = 0;
reuse.length = value.length;
System.arraycopy(value.bytes, value.offset, reuse.bytes, 0, value.length);
return reuse;
} else {
return BytesRef.deepCopyOf(value);
}
}
@Override
public void setNextReader(LeafReader reader) throws IOException {
DocValuesType type = getDocValuesType(reader, field);
if (type == null || type == DocValuesType.NONE) {
values = DocValues.emptySorted();
docsWithField = new Bits.MatchNoBits(reader.maxDoc());
return ;
}
docsWithField = DocValues.getDocsWithField(reader, field);
switch (type) {
case SORTED:
values = DocValues.getSorted(reader, field);
break;
case SORTED_SET:
final SortedSetDocValues sorted = DocValues.getSortedSet(reader, field);
values = DocValues.unwrapSingleton(sorted);
if (values == null) {
values = new SortedDocValues() {
@Override
public int getOrd(int docID) {
sorted.setDocument(docID);
int ord = (int) sorted.nextOrd();
if (sorted.nextOrd() != SortedSetDocValues.NO_MORE_ORDS) {
throw new IllegalStateException("failed to collapse " + docID +
", the collapse field must be single valued");
}
return ord;
}
@Override
public BytesRef lookupOrd(int ord) {
return sorted.lookupOrd(ord);
}
@Override
public int getValueCount() {
return (int) sorted.getValueCount();
}
};
}
break;
default:
throw new IllegalStateException("unexpected doc values type "
+ type + "` for field `" + field + "`");
}
}
}
private static DocValuesType getDocValuesType(LeafReader in, String field) {
FieldInfo fi = in.getFieldInfos().fieldInfo(field);
if (fi != null) {
return fi.getDocValuesType();
}
return null;
}
}
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