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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.search.aggregations.bucket.nested;
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.mapper.ObjectMapper;
import org.elasticsearch.index.query.support.NestedScope;
import org.elasticsearch.search.SearchParseException;
import org.elasticsearch.search.aggregations.AbstractAggregationBuilder;
import org.elasticsearch.search.aggregations.AggregationExecutionException;
import org.elasticsearch.search.aggregations.AggregatorFactories.Builder;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.Objects;
public class ReverseNestedAggregationBuilder extends AbstractAggregationBuilder<ReverseNestedAggregationBuilder> {
public static final String NAME = "reverse_nested";
private String path;
public ReverseNestedAggregationBuilder(String name) {
super(name);
}
/**
* Read from a stream.
*/
public ReverseNestedAggregationBuilder(StreamInput in) throws IOException {
super(in);
path = in.readOptionalString();
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
out.writeOptionalString(path);
}
/**
* Set the path to use for this nested aggregation. The path must match
* the path to a nested object in the mappings. If it is not specified
* then this aggregation will go back to the root document.
*/
public ReverseNestedAggregationBuilder path(String path) {
if (path == null) {
throw new IllegalArgumentException("[path] must not be null: [" + name + "]");
}
this.path = path;
return this;
}
/**
* Get the path to use for this nested aggregation.
*/
public String path() {
return path;
}
@Override
protected AggregatorFactory<?> doBuild(SearchContext context, AggregatorFactory<?> parent, Builder subFactoriesBuilder)
throws IOException {
if (findNestedAggregatorFactory(parent) == null) {
throw new SearchParseException(context,
"Reverse nested aggregation [" + name + "] can only be used inside a [nested] aggregation", null);
}
ObjectMapper parentObjectMapper = null;
if (path != null) {
parentObjectMapper = context.getObjectMapper(path);
if (parentObjectMapper == null) {
return new ReverseNestedAggregatorFactory(name, true, null, context, parent, subFactoriesBuilder, metaData);
}
if (parentObjectMapper.nested().isNested() == false) {
throw new AggregationExecutionException("[reverse_nested] nested path [" + path + "] is not nested");
}
}
NestedScope nestedScope = context.getQueryShardContext().nestedScope();
try {
nestedScope.nextLevel(parentObjectMapper);
return new ReverseNestedAggregatorFactory(name, false, parentObjectMapper, context, parent, subFactoriesBuilder,
metaData);
} finally {
nestedScope.previousLevel();
}
}
private static NestedAggregatorFactory findNestedAggregatorFactory(AggregatorFactory<?> parent) {
if (parent == null) {
return null;
} else if (parent instanceof NestedAggregatorFactory) {
return (NestedAggregatorFactory) parent;
} else {
return findNestedAggregatorFactory(parent.getParent());
}
}
@Override
protected XContentBuilder internalXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject();
if (path != null) {
builder.field(ReverseNestedAggregator.PATH_FIELD.getPreferredName(), path);
}
builder.endObject();
return builder;
}
public static ReverseNestedAggregationBuilder parse(String aggregationName, XContentParser parser) throws IOException {
String path = 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 ("path".equals(currentFieldName)) {
path = 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 + "].");
}
}
ReverseNestedAggregationBuilder factory = new ReverseNestedAggregationBuilder(
aggregationName);
if (path != null) {
factory.path(path);
}
return factory;
}
@Override
protected int doHashCode() {
return Objects.hash(path);
}
@Override
protected boolean doEquals(Object obj) {
ReverseNestedAggregationBuilder other = (ReverseNestedAggregationBuilder) obj;
return Objects.equals(path, other.path);
}
@Override
public String getType() {
return NAME;
}
}
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