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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.terms;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.ParseFieldMatcher;
import org.elasticsearch.common.ParsingException;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.common.xcontent.XContentParser.Token;
import org.elasticsearch.search.aggregations.Aggregator.SubAggCollectionMode;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.aggregations.bucket.terms.Terms.Order;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregator.BucketCountThresholds;
import org.elasticsearch.search.aggregations.bucket.terms.support.IncludeExclude;
import org.elasticsearch.search.aggregations.support.ValueType;
import org.elasticsearch.search.aggregations.support.ValuesSourceType;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
/**
*
*/
public class TermsParser extends AbstractTermsParser {
@Override
public String type() {
return StringTerms.TYPE.name();
}
@Override
protected TermsAggregatorFactory doCreateFactory(String aggregationName, ValuesSourceType valuesSourceType,
ValueType targetValueType, BucketCountThresholds bucketCountThresholds, SubAggCollectionMode collectMode, String executionHint,
IncludeExclude incExc, Map<ParseField, Object> otherOptions) {
TermsAggregatorFactory factory = new TermsAggregatorFactory(aggregationName, targetValueType);
List<OrderElement> orderElements = (List<OrderElement>) otherOptions.get(TermsAggregatorFactory.ORDER_FIELD);
if (orderElements != null) {
List<Terms.Order> orders = new ArrayList<>(orderElements.size());
for (OrderElement orderElement : orderElements) {
orders.add(resolveOrder(orderElement.key(), orderElement.asc()));
}
factory.order(orders);
}
if (bucketCountThresholds != null) {
factory.bucketCountThresholds(bucketCountThresholds);
}
if (collectMode != null) {
factory.collectMode(collectMode);
}
if (executionHint != null) {
factory.executionHint(executionHint);
}
if (incExc != null) {
factory.includeExclude(incExc);
}
Boolean showTermDocCountError = (Boolean) otherOptions.get(TermsAggregatorFactory.SHOW_TERM_DOC_COUNT_ERROR);
if (showTermDocCountError != null) {
factory.showTermDocCountError(showTermDocCountError);
}
return factory;
}
@Override
public boolean parseSpecial(String aggregationName, XContentParser parser, ParseFieldMatcher parseFieldMatcher, Token token,
String currentFieldName, Map<ParseField, Object> otherOptions) throws IOException {
if (token == XContentParser.Token.START_OBJECT) {
if (parseFieldMatcher.match(currentFieldName, TermsAggregatorFactory.ORDER_FIELD)) {
otherOptions.put(TermsAggregatorFactory.ORDER_FIELD, Collections.singletonList(parseOrderParam(aggregationName, parser)));
return true;
}
} else if (token == XContentParser.Token.START_ARRAY) {
if (parseFieldMatcher.match(currentFieldName, TermsAggregatorFactory.ORDER_FIELD)) {
List<OrderElement> orderElements = new ArrayList<>();
while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
if (token == XContentParser.Token.START_OBJECT) {
OrderElement orderParam = parseOrderParam(aggregationName, parser);
orderElements.add(orderParam);
} else {
throw new ParsingException(parser.getTokenLocation(),
"Order elements must be of type object in [" + aggregationName + "] found token of type [" + token + "].");
}
}
otherOptions.put(TermsAggregatorFactory.ORDER_FIELD, orderElements);
return true;
}
} else if (token == XContentParser.Token.VALUE_BOOLEAN) {
if (parseFieldMatcher.match(currentFieldName, TermsAggregatorFactory.SHOW_TERM_DOC_COUNT_ERROR)) {
otherOptions.put(TermsAggregatorFactory.SHOW_TERM_DOC_COUNT_ERROR, parser.booleanValue());
return true;
}
}
return false;
}
private OrderElement parseOrderParam(String aggregationName, XContentParser parser) throws IOException {
XContentParser.Token token;
OrderElement orderParam = null;
String orderKey = null;
boolean orderAsc = false;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
orderKey = parser.currentName();
} else if (token == XContentParser.Token.VALUE_STRING) {
String dir = parser.text();
if ("asc".equalsIgnoreCase(dir)) {
orderAsc = true;
} else if ("desc".equalsIgnoreCase(dir)) {
orderAsc = false;
} else {
throw new ParsingException(parser.getTokenLocation(),
"Unknown terms order direction [" + dir + "] in terms aggregation [" + aggregationName + "]");
}
} else {
throw new ParsingException(parser.getTokenLocation(),
"Unexpected token " + token + " for [order] in [" + aggregationName + "].");
}
}
if (orderKey == null) {
throw new ParsingException(parser.getTokenLocation(),
"Must specify at least one field for [order] in [" + aggregationName + "].");
} else {
orderParam = new OrderElement(orderKey, orderAsc);
}
return orderParam;
}
static class OrderElement {
private final String key;
private final boolean asc;
public OrderElement(String key, boolean asc) {
this.key = key;
this.asc = asc;
}
public String key() {
return key;
}
public boolean asc() {
return asc;
}
}
@Override
public TermsAggregator.BucketCountThresholds getDefaultBucketCountThresholds() {
return new TermsAggregator.BucketCountThresholds(TermsAggregatorFactory.DEFAULT_BUCKET_COUNT_THRESHOLDS);
}
static Terms.Order resolveOrder(String key, boolean asc) {
if ("_term".equals(key)) {
return Order.term(asc);
}
if ("_count".equals(key)) {
return Order.count(asc);
}
return Order.aggregation(key, asc);
}
@Override
public AggregatorFactory<?> getFactoryPrototypes() {
return new TermsAggregatorFactory(null, null);
}
}
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