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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;
import org.elasticsearch.common.CheckedBiConsumer;
import org.elasticsearch.common.CheckedFunction;
import org.elasticsearch.common.xcontent.ObjectParser;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.common.xcontent.XContentParserUtils;
import org.elasticsearch.search.aggregations.bucket.MultiBucketsAggregation;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Supplier;
import static org.elasticsearch.common.xcontent.XContentParserUtils.ensureExpectedToken;
public abstract class ParsedMultiBucketAggregation<B extends ParsedMultiBucketAggregation.Bucket>
extends ParsedAggregation implements MultiBucketsAggregation {
protected final List<B> buckets = new ArrayList<>();
protected boolean keyed = false;
@Override
protected XContentBuilder doXContentBody(XContentBuilder builder, Params params) throws IOException {
if (keyed) {
builder.startObject(CommonFields.BUCKETS.getPreferredName());
} else {
builder.startArray(CommonFields.BUCKETS.getPreferredName());
}
for (B bucket : buckets) {
bucket.toXContent(builder, params);
}
if (keyed) {
builder.endObject();
} else {
builder.endArray();
}
return builder;
}
protected static void declareMultiBucketAggregationFields(final ObjectParser<? extends ParsedMultiBucketAggregation, Void> objectParser,
final CheckedFunction<XContentParser, ParsedBucket, IOException> bucketParser,
final CheckedFunction<XContentParser, ParsedBucket, IOException> keyedBucketParser) {
declareAggregationFields(objectParser);
objectParser.declareField((parser, aggregation, context) -> {
XContentParser.Token token = parser.currentToken();
if (token == XContentParser.Token.START_OBJECT) {
aggregation.keyed = true;
while (parser.nextToken() != XContentParser.Token.END_OBJECT) {
aggregation.buckets.add(keyedBucketParser.apply(parser));
}
} else if (token == XContentParser.Token.START_ARRAY) {
aggregation.keyed = false;
while (parser.nextToken() != XContentParser.Token.END_ARRAY) {
aggregation.buckets.add(bucketParser.apply(parser));
}
}
}, CommonFields.BUCKETS, ObjectParser.ValueType.OBJECT_ARRAY);
}
public abstract static class ParsedBucket implements MultiBucketsAggregation.Bucket {
private Aggregations aggregations;
private String keyAsString;
private long docCount;
private boolean keyed;
protected void setKeyAsString(String keyAsString) {
this.keyAsString = keyAsString;
}
@Override
public String getKeyAsString() {
return keyAsString;
}
protected void setDocCount(long docCount) {
this.docCount = docCount;
}
@Override
public long getDocCount() {
return docCount;
}
public void setKeyed(boolean keyed) {
this.keyed = keyed;
}
protected boolean isKeyed() {
return keyed;
}
protected void setAggregations(Aggregations aggregations) {
this.aggregations = aggregations;
}
@Override
public Aggregations getAggregations() {
return aggregations;
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
if (keyed) {
// Subclasses can override the getKeyAsString method to handle specific cases like
// keyed bucket with RAW doc value format where the key_as_string field is not printed
// out but we still need to have a string version of the key to use as the bucket's name.
builder.startObject(getKeyAsString());
} else {
builder.startObject();
}
if (keyAsString != null) {
builder.field(CommonFields.KEY_AS_STRING.getPreferredName(), getKeyAsString());
}
keyToXContent(builder);
builder.field(CommonFields.DOC_COUNT.getPreferredName(), docCount);
aggregations.toXContentInternal(builder, params);
builder.endObject();
return builder;
}
protected XContentBuilder keyToXContent(XContentBuilder builder) throws IOException {
return builder.field(CommonFields.KEY.getPreferredName(), getKey());
}
protected static <B extends ParsedBucket> B parseXContent(final XContentParser parser,
final boolean keyed,
final Supplier<B> bucketSupplier,
final CheckedBiConsumer<XContentParser, B, IOException> keyConsumer)
throws IOException {
final B bucket = bucketSupplier.get();
bucket.setKeyed(keyed);
XContentParser.Token token = parser.currentToken();
String currentFieldName = parser.currentName();
if (keyed) {
ensureExpectedToken(XContentParser.Token.FIELD_NAME, token, parser::getTokenLocation);
ensureExpectedToken(XContentParser.Token.START_OBJECT, parser.nextToken(), parser::getTokenLocation);
}
List<Aggregation> aggregations = new ArrayList<>();
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token.isValue()) {
if (CommonFields.KEY_AS_STRING.getPreferredName().equals(currentFieldName)) {
bucket.setKeyAsString(parser.text());
} else if (CommonFields.KEY.getPreferredName().equals(currentFieldName)) {
keyConsumer.accept(parser, bucket);
} else if (CommonFields.DOC_COUNT.getPreferredName().equals(currentFieldName)) {
bucket.setDocCount(parser.longValue());
}
} else if (token == XContentParser.Token.START_OBJECT) {
aggregations.add(XContentParserUtils.parseTypedKeysObject(parser, Aggregation.TYPED_KEYS_DELIMITER, Aggregation.class));
}
}
bucket.setAggregations(new Aggregations(aggregations));
return bucket;
}
}
}
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