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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.join.aggregations;
import org.apache.lucene.search.Query;
import org.elasticsearch.common.ParsingException;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.fielddata.plain.SortedSetDVOrdinalsIndexFieldData;
import org.elasticsearch.index.mapper.DocumentMapper;
import org.elasticsearch.index.mapper.MappedFieldType;
import org.elasticsearch.index.mapper.ParentFieldMapper;
import org.elasticsearch.join.mapper.ParentIdFieldMapper;
import org.elasticsearch.join.mapper.ParentJoinFieldMapper;
import org.elasticsearch.search.aggregations.AggregatorFactories.Builder;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.aggregations.support.FieldContext;
import org.elasticsearch.search.aggregations.support.ValueType;
import org.elasticsearch.search.aggregations.support.ValuesSource.Bytes.WithOrdinals;
import org.elasticsearch.search.aggregations.support.ValuesSourceAggregationBuilder;
import org.elasticsearch.search.aggregations.support.ValuesSourceAggregatorFactory;
import org.elasticsearch.search.aggregations.support.ValuesSourceConfig;
import org.elasticsearch.search.aggregations.support.ValuesSourceType;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.Objects;
public class ChildrenAggregationBuilder
extends ValuesSourceAggregationBuilder<WithOrdinals, ChildrenAggregationBuilder> {
public static final String NAME = "children";
private final String childType;
private Query parentFilter;
private Query childFilter;
/**
* @param name
* the name of this aggregation
* @param childType
* the type of children documents
*/
public ChildrenAggregationBuilder(String name, String childType) {
super(name, ValuesSourceType.BYTES, ValueType.STRING);
if (childType == null) {
throw new IllegalArgumentException("[childType] must not be null: [" + name + "]");
}
this.childType = childType;
}
/**
* Read from a stream.
*/
public ChildrenAggregationBuilder(StreamInput in) throws IOException {
super(in, ValuesSourceType.BYTES, ValueType.STRING);
childType = in.readString();
}
@Override
protected void innerWriteTo(StreamOutput out) throws IOException {
out.writeString(childType);
}
@Override
protected ValuesSourceAggregatorFactory<WithOrdinals, ?> innerBuild(SearchContext context,
ValuesSourceConfig<WithOrdinals> config,
AggregatorFactory<?> parent,
Builder subFactoriesBuilder) throws IOException {
return new ChildrenAggregatorFactory(name, config, childFilter, parentFilter, context, parent,
subFactoriesBuilder, metaData);
}
@Override
protected ValuesSourceConfig<WithOrdinals> resolveConfig(SearchContext context) {
ValuesSourceConfig<WithOrdinals> config = new ValuesSourceConfig<>(ValuesSourceType.BYTES);
if (context.mapperService().getIndexSettings().isSingleType()) {
joinFieldResolveConfig(context, config);
} else {
parentFieldResolveConfig(context, config);
}
return config;
}
private void joinFieldResolveConfig(SearchContext context, ValuesSourceConfig<WithOrdinals> config) {
ParentJoinFieldMapper parentJoinFieldMapper = ParentJoinFieldMapper.getMapper(context.mapperService());
ParentIdFieldMapper parentIdFieldMapper = parentJoinFieldMapper.getParentIdFieldMapper(childType, false);
if (parentIdFieldMapper != null) {
parentFilter = parentIdFieldMapper.getParentFilter();
childFilter = parentIdFieldMapper.getChildFilter(childType);
MappedFieldType fieldType = parentIdFieldMapper.fieldType();
final SortedSetDVOrdinalsIndexFieldData fieldData = context.fieldData().getForField(fieldType);
config.fieldContext(new FieldContext(fieldType.name(), fieldData, fieldType));
} else {
config.unmapped(true);
}
}
private void parentFieldResolveConfig(SearchContext context, ValuesSourceConfig<WithOrdinals> config) {
DocumentMapper childDocMapper = context.mapperService().documentMapper(childType);
if (childDocMapper != null) {
ParentFieldMapper parentFieldMapper = childDocMapper.parentFieldMapper();
if (!parentFieldMapper.active()) {
throw new IllegalArgumentException("[children] no [_parent] field not configured that points to a parent type");
}
String parentType = parentFieldMapper.type();
DocumentMapper parentDocMapper = context.mapperService().documentMapper(parentType);
if (parentDocMapper != null) {
parentFilter = parentDocMapper.typeFilter(context.getQueryShardContext());
childFilter = childDocMapper.typeFilter(context.getQueryShardContext());
MappedFieldType parentFieldType = parentDocMapper.parentFieldMapper().getParentJoinFieldType();
final SortedSetDVOrdinalsIndexFieldData fieldData = context.fieldData().getForField(parentFieldType);
config.fieldContext(new FieldContext(parentFieldType.name(), fieldData,
parentFieldType));
} else {
config.unmapped(true);
}
} else {
config.unmapped(true);
}
}
@Override
protected XContentBuilder doXContentBody(XContentBuilder builder, Params params) throws IOException {
builder.field(ParentToChildrenAggregator.TYPE_FIELD.getPreferredName(), childType);
return builder;
}
public static ChildrenAggregationBuilder parse(String aggregationName, XContentParser parser) throws IOException {
String childType = null;
XContentParser.Token token;
String currentFieldName = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token == XContentParser.Token.VALUE_STRING) {
if ("type".equals(currentFieldName)) {
childType = parser.text();
} else {
throw new ParsingException(parser.getTokenLocation(),
"Unknown key for a " + token + " in [" + aggregationName + "]: [" + currentFieldName + "].");
}
} else {
throw new ParsingException(parser.getTokenLocation(), "Unexpected token " + token + " in [" + aggregationName + "].");
}
}
if (childType == null) {
throw new ParsingException(parser.getTokenLocation(),
"Missing [child_type] field for children aggregation [" + aggregationName + "]");
}
return new ChildrenAggregationBuilder(aggregationName, childType);
}
@Override
protected int innerHashCode() {
return Objects.hash(childType);
}
@Override
protected boolean innerEquals(Object obj) {
ChildrenAggregationBuilder other = (ChildrenAggregationBuilder) obj;
return Objects.equals(childType, other.childType);
}
@Override
public String getType() {
return NAME;
}
}
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