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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.metrics.cardinality;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.mapper.core.Murmur3FieldMapper;
import org.elasticsearch.search.SearchParseException;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.aggregations.support.ValuesSourceConfig;
import org.elasticsearch.search.aggregations.support.ValuesSourceParser;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
public class CardinalityParser implements Aggregator.Parser {
private static final ParseField PRECISION_THRESHOLD = new ParseField("precision_threshold");
@Override
public String type() {
return InternalCardinality.TYPE.name();
}
@Override
public AggregatorFactory parse(String name, XContentParser parser, SearchContext context) throws IOException {
ValuesSourceParser vsParser = ValuesSourceParser.any(name, InternalCardinality.TYPE, context).build();
long precisionThreshold = -1;
Boolean rehash = 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 (vsParser.token(currentFieldName, token, parser)) {
continue;
} else if (token.isValue()) {
if ("rehash".equals(currentFieldName)) {
rehash = parser.booleanValue();
} else if (PRECISION_THRESHOLD.match(currentFieldName)) {
precisionThreshold = parser.longValue();
} else {
throw new SearchParseException(context, "Unknown key for a " + token + " in [" + name + "]: [" + currentFieldName + "].");
}
} else {
throw new SearchParseException(context, "Unexpected token " + token + " in [" + name + "].");
}
}
ValuesSourceConfig<?> config = vsParser.config();
if (rehash == null && config.fieldContext() != null && config.fieldContext().mapper() instanceof Murmur3FieldMapper) {
rehash = false;
} else if (rehash == null) {
rehash = true;
}
return new CardinalityAggregatorFactory(name, config, precisionThreshold, rehash);
}
}