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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.xcontent.XContentParser;
import org.elasticsearch.search.SearchParseException;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class TermsParametersParser extends AbstractTermsParametersParser {
private static final TermsAggregator.BucketCountThresholds DEFAULT_BUCKET_COUNT_THRESHOLDS = new TermsAggregator.BucketCountThresholds(1, 0, 10, -1);
public List<OrderElement> getOrderElements() {
return orderElements;
}
public boolean showTermDocCountError() {
return showTermDocCountError;
}
List<OrderElement> orderElements;
private boolean showTermDocCountError = false;
public TermsParametersParser() {
orderElements = new ArrayList<>(1);
orderElements.add(new OrderElement("_count", false));
}
@Override
public void parseSpecial(String aggregationName, XContentParser parser, SearchContext context, XContentParser.Token token, String currentFieldName) throws IOException {
if (token == XContentParser.Token.START_OBJECT) {
if ("order".equals(currentFieldName)) {
this.orderElements = Collections.singletonList(parseOrderParam(aggregationName, parser, context));
} else {
throw new SearchParseException(context, "Unknown key for a " + token + " in [" + aggregationName + "]: ["
+ currentFieldName + "].", parser.getTokenLocation());
}
} else if (token == XContentParser.Token.START_ARRAY) {
if ("order".equals(currentFieldName)) {
orderElements = new ArrayList<>();
while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
if (token == XContentParser.Token.START_OBJECT) {
OrderElement orderParam = parseOrderParam(aggregationName, parser, context);
orderElements.add(orderParam);
} else {
throw new SearchParseException(context, "Order elements must be of type object in [" + aggregationName + "].",
parser.getTokenLocation());
}
}
} else {
throw new SearchParseException(context, "Unknown key for a " + token + " in [" + aggregationName + "]: ["
+ currentFieldName + "].", parser.getTokenLocation());
}
} else if (token == XContentParser.Token.VALUE_BOOLEAN) {
if (context.parseFieldMatcher().match(currentFieldName, SHOW_TERM_DOC_COUNT_ERROR)) {
showTermDocCountError = parser.booleanValue();
}
} else {
throw new SearchParseException(context, "Unknown key for a " + token + " in [" + aggregationName + "]: [" + currentFieldName
+ "].", parser.getTokenLocation());
}
}
private OrderElement parseOrderParam(String aggregationName, XContentParser parser, SearchContext context) 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 SearchParseException(context, "Unknown terms order direction [" + dir + "] in terms aggregation ["
+ aggregationName + "]", parser.getTokenLocation());
}
} else {
throw new SearchParseException(context, "Unexpected token " + token + " for [order] in [" + aggregationName + "].",
parser.getTokenLocation());
}
}
if (orderKey == null) {
throw new SearchParseException(context, "Must specify at least one field for [order] in [" + aggregationName + "].",
parser.getTokenLocation());
} 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(DEFAULT_BUCKET_COUNT_THRESHOLDS);
}
}