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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.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 NestedAggregationBuilder extends AbstractAggregationBuilder<NestedAggregationBuilder> {
public static final String NAME = "nested";
private final String path;
/**
* @param name
* the name of this aggregation
* @param path
* the path to use for this nested aggregation. The path must
* match the path to a nested object in the mappings.
*/
public NestedAggregationBuilder(String name, String path) {
super(name);
if (path == null) {
throw new IllegalArgumentException("[path] must not be null: [" + name + "]");
}
this.path = path;
}
/**
* Read from a stream.
*/
public NestedAggregationBuilder(StreamInput in) throws IOException {
super(in);
path = in.readString();
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
out.writeString(path);
}
/**
* 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 {
ObjectMapper childObjectMapper = context.getObjectMapper(path);
if (childObjectMapper == null) {
// in case the path has been unmapped:
return new NestedAggregatorFactory(name, null, null, context, parent, subFactoriesBuilder, metaData);
}
if (childObjectMapper.nested().isNested() == false) {
throw new AggregationExecutionException("[nested] nested path [" + path + "] is not nested");
}
try {
ObjectMapper parentObjectMapper = context.getQueryShardContext().nestedScope().nextLevel(childObjectMapper);
return new NestedAggregatorFactory(name, parentObjectMapper, childObjectMapper, context, parent, subFactoriesBuilder,
metaData);
} finally {
context.getQueryShardContext().nestedScope().previousLevel();
}
}
@Override
protected XContentBuilder internalXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject();
builder.field(NestedAggregator.PATH_FIELD.getPreferredName(), path);
builder.endObject();
return builder;
}
public static NestedAggregationBuilder 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 (NestedAggregator.PATH_FIELD.match(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 + "].");
}
}
if (path == null) {
// "field" doesn't exist, so we fall back to the context of the ancestors
throw new ParsingException(parser.getTokenLocation(), "Missing [path] field for nested aggregation [" + aggregationName + "]");
}
return new NestedAggregationBuilder(aggregationName, path);
}
@Override
protected int doHashCode() {
return Objects.hash(path);
}
@Override
protected boolean doEquals(Object obj) {
NestedAggregationBuilder other = (NestedAggregationBuilder) obj;
return Objects.equals(path, other.path);
}
@Override
public String getType() {
return NAME;
}
}
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