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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;
import org.apache.lucene.search.Sort;
import org.apache.lucene.search.SortField;
import org.apache.lucene.search.SortedNumericSortField;
import org.apache.lucene.search.SortedSetSortField;
import org.elasticsearch.Version;
import org.elasticsearch.common.settings.Setting;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.fielddata.IndexFieldData;
import org.elasticsearch.index.mapper.MappedFieldType;
import org.elasticsearch.search.MultiValueMode;
import org.elasticsearch.search.sort.SortOrder;
import java.util.Collections;
import java.util.EnumSet;
import java.util.List;
import java.util.function.Function;
/**
* Holds all the information that is used to build the sort order of an index.
*
* The index sort settings are final and can be defined only at index creation.
* These settings are divided in four lists that are merged during the initialization of this class:
*
* - `index.sort.field`: the field or a list of field to use for the sort
* - `index.sort.order` the {@link SortOrder} to use for the field or a list of {@link SortOrder}
* for each field defined in `index.sort.field`.
*
* - `index.sort.mode`: the {@link MultiValueMode} to use for the field or a list of orders
* for each field defined in `index.sort.field`.
*
* - `index.sort.missing`: the missing value to use for the field or a list of missing values
* for each field defined in `index.sort.field`
*
*
*
**/
public final class IndexSortConfig {
/**
* The list of field names
*/
public static final Setting> INDEX_SORT_FIELD_SETTING =
Setting.listSetting("index.sort.field", Collections.emptyList(),
Function.identity(), Setting.Property.IndexScope, Setting.Property.Final);
/**
* The {@link SortOrder} for each specified sort field (ie. asc or desc).
*/
public static final Setting> INDEX_SORT_ORDER_SETTING =
Setting.listSetting("index.sort.order", Collections.emptyList(),
IndexSortConfig::parseOrderMode, Setting.Property.IndexScope, Setting.Property.Final);
/**
* The {@link MultiValueMode} for each specified sort field (ie. max or min).
*/
public static final Setting> INDEX_SORT_MODE_SETTING =
Setting.listSetting("index.sort.mode", Collections.emptyList(),
IndexSortConfig::parseMultiValueMode, Setting.Property.IndexScope, Setting.Property.Final);
/**
* The missing value for each specified sort field (ie. _first or _last)
*/
public static final Setting> INDEX_SORT_MISSING_SETTING =
Setting.listSetting("index.sort.missing", Collections.emptyList(),
IndexSortConfig::validateMissingValue, Setting.Property.IndexScope, Setting.Property.Final);
private static String validateMissingValue(String missing) {
if ("_last".equals(missing) == false && "_first".equals(missing) == false) {
throw new IllegalArgumentException("Illegal missing value:[" + missing + "], " +
"must be one of [_last, _first]");
}
return missing;
}
private static SortOrder parseOrderMode(String value) {
try {
return SortOrder.fromString(value);
} catch (Exception e) {
throw new IllegalArgumentException("Illegal sort order:" + value);
}
}
private static MultiValueMode parseMultiValueMode(String value) {
MultiValueMode mode = MultiValueMode.fromString(value);
if (mode != MultiValueMode.MAX && mode != MultiValueMode.MIN) {
throw new IllegalArgumentException("Illegal index sort mode:[" + mode + "], " +
"must be one of [" + MultiValueMode.MAX + ", " + MultiValueMode.MIN + "]");
}
return mode;
}
// visible for tests
final FieldSortSpec[] sortSpecs;
public IndexSortConfig(IndexSettings indexSettings) {
final Settings settings = indexSettings.getSettings();
List fields = INDEX_SORT_FIELD_SETTING.get(settings);
this.sortSpecs = fields.stream()
.map((name) -> new FieldSortSpec(name))
.toArray(FieldSortSpec[]::new);
if (sortSpecs.length > 0 && indexSettings.getIndexVersionCreated().before(Version.V_6_0_0_alpha1)) {
/**
* This index might be assigned to a node where the index sorting feature is not available
* (ie. versions prior to {@link Version.V_6_0_0_alpha1_UNRELEASED}) so we must fail here rather than later.
*/
throw new IllegalArgumentException("unsupported index.version.created:" + indexSettings.getIndexVersionCreated() +
", can't set index.sort on versions prior to " + Version.V_6_0_0_alpha1);
}
if (INDEX_SORT_ORDER_SETTING.exists(settings)) {
List orders = INDEX_SORT_ORDER_SETTING.get(settings);
if (orders.size() != sortSpecs.length) {
throw new IllegalArgumentException("index.sort.field:" + fields +
" index.sort.order:" + orders.toString() + ", size mismatch");
}
for (int i = 0; i < sortSpecs.length; i++) {
sortSpecs[i].order = orders.get(i);
}
}
if (INDEX_SORT_MODE_SETTING.exists(settings)) {
List modes = INDEX_SORT_MODE_SETTING.get(settings);
if (modes.size() != sortSpecs.length) {
throw new IllegalArgumentException("index.sort.field:" + fields +
" index.sort.mode:" + modes + ", size mismatch");
}
for (int i = 0; i < sortSpecs.length; i++) {
sortSpecs[i].mode = modes.get(i);
}
}
if (INDEX_SORT_MISSING_SETTING.exists(settings)) {
List missingValues = INDEX_SORT_MISSING_SETTING.get(settings);
if (missingValues.size() != sortSpecs.length) {
throw new IllegalArgumentException("index.sort.field:" + fields +
" index.sort.missing:" + missingValues + ", size mismatch");
}
for (int i = 0; i < sortSpecs.length; i++) {
sortSpecs[i].missingValue = missingValues.get(i);
}
}
}
/**
* Returns true if the index should be sorted
*/
public boolean hasIndexSort() {
return sortSpecs.length > 0;
}
/**
* Builds the {@link Sort} order from the settings for this index
* or returns null if this index has no sort.
*/
public Sort buildIndexSort(Function fieldTypeLookup,
Function> fieldDataLookup) {
if (hasIndexSort() == false) {
return null;
}
final SortField[] sortFields = new SortField[sortSpecs.length];
for (int i = 0; i < sortSpecs.length; i++) {
FieldSortSpec sortSpec = sortSpecs[i];
final MappedFieldType ft = fieldTypeLookup.apply(sortSpec.field);
if (ft == null) {
throw new IllegalArgumentException("unknown index sort field:[" + sortSpec.field + "]");
}
boolean reverse = sortSpec.order == null ? false : (sortSpec.order == SortOrder.DESC);
MultiValueMode mode = sortSpec.mode;
if (mode == null) {
mode = reverse ? MultiValueMode.MAX : MultiValueMode.MIN;
}
IndexFieldData fieldData;
try {
fieldData = fieldDataLookup.apply(ft);
} catch (Exception e) {
throw new IllegalArgumentException("docvalues not found for index sort field:[" + sortSpec.field + "]");
}
if (fieldData == null) {
throw new IllegalArgumentException("docvalues not found for index sort field:[" + sortSpec.field + "]");
}
sortFields[i] = fieldData.sortField(sortSpec.missingValue, mode, null, reverse);
validateIndexSortField(sortFields[i]);
}
return new Sort(sortFields);
}
private void validateIndexSortField(SortField sortField) {
SortField.Type type = getSortFieldType(sortField);
if (ALLOWED_INDEX_SORT_TYPES.contains(type) == false) {
throw new IllegalArgumentException("invalid index sort field:[" + sortField.getField() + "]");
}
}
static class FieldSortSpec {
final String field;
SortOrder order;
MultiValueMode mode;
String missingValue;
FieldSortSpec(String field) {
this.field = field;
}
}
/** We only allow index sorting on these types */
private static final EnumSet ALLOWED_INDEX_SORT_TYPES = EnumSet.of(
SortField.Type.STRING,
SortField.Type.LONG,
SortField.Type.INT,
SortField.Type.DOUBLE,
SortField.Type.FLOAT
);
public static SortField.Type getSortFieldType(SortField sortField) {
if (sortField instanceof SortedSetSortField) {
return SortField.Type.STRING;
} else if (sortField instanceof SortedNumericSortField) {
return ((SortedNumericSortField) sortField).getNumericType();
} else {
return sortField.getType();
}
}
}