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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.tophits;
import org.elasticsearch.ExceptionsHelper;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.search.SearchParseException;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.fetch.FetchPhase;
import org.elasticsearch.search.fetch.FieldsParseElement;
import org.elasticsearch.search.fetch.fielddata.FieldDataFieldsParseElement;
import org.elasticsearch.search.fetch.script.ScriptFieldsParseElement;
import org.elasticsearch.search.fetch.source.FetchSourceParseElement;
import org.elasticsearch.search.highlight.HighlighterParseElement;
import org.elasticsearch.search.internal.SearchContext;
import org.elasticsearch.search.internal.SubSearchContext;
import org.elasticsearch.search.sort.SortParseElement;
import java.io.IOException;
/**
*
*/
public class TopHitsParser implements Aggregator.Parser {
private final FetchPhase fetchPhase;
private final SortParseElement sortParseElement;
private final FetchSourceParseElement sourceParseElement;
private final HighlighterParseElement highlighterParseElement;
private final FieldDataFieldsParseElement fieldDataFieldsParseElement;
private final ScriptFieldsParseElement scriptFieldsParseElement;
private final FieldsParseElement fieldsParseElement;
@Inject
public TopHitsParser(FetchPhase fetchPhase, SortParseElement sortParseElement, FetchSourceParseElement sourceParseElement,
HighlighterParseElement highlighterParseElement, FieldDataFieldsParseElement fieldDataFieldsParseElement,
ScriptFieldsParseElement scriptFieldsParseElement, FieldsParseElement fieldsParseElement) {
this.fetchPhase = fetchPhase;
this.sortParseElement = sortParseElement;
this.sourceParseElement = sourceParseElement;
this.highlighterParseElement = highlighterParseElement;
this.fieldDataFieldsParseElement = fieldDataFieldsParseElement;
this.scriptFieldsParseElement = scriptFieldsParseElement;
this.fieldsParseElement = fieldsParseElement;
}
@Override
public String type() {
return InternalTopHits.TYPE.name();
}
@Override
public AggregatorFactory parse(String aggregationName, XContentParser parser, SearchContext context) throws IOException {
SubSearchContext subSearchContext = new SubSearchContext(context);
XContentParser.Token token;
String currentFieldName = null;
try {
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if ("sort".equals(currentFieldName)) {
sortParseElement.parse(parser, subSearchContext);
} else if ("_source".equals(currentFieldName)) {
sourceParseElement.parse(parser, subSearchContext);
} else if ("fields".equals(currentFieldName)) {
fieldsParseElement.parse(parser, subSearchContext);
} else if (token.isValue()) {
switch (currentFieldName) {
case "from":
subSearchContext.from(parser.intValue());
break;
case "size":
subSearchContext.size(parser.intValue());
break;
case "track_scores":
case "trackScores":
subSearchContext.trackScores(parser.booleanValue());
break;
case "version":
subSearchContext.version(parser.booleanValue());
break;
case "explain":
subSearchContext.explain(parser.booleanValue());
break;
default:
throw new SearchParseException(context, "Unknown key for a " + token + " in [" + aggregationName + "]: ["
+ currentFieldName + "].", parser.getTokenLocation());
}
} else if (token == XContentParser.Token.START_OBJECT) {
switch (currentFieldName) {
case "highlight":
highlighterParseElement.parse(parser, subSearchContext);
break;
case "scriptFields":
case "script_fields":
scriptFieldsParseElement.parse(parser, subSearchContext);
break;
default:
throw new SearchParseException(context, "Unknown key for a " + token + " in [" + aggregationName + "]: ["
+ currentFieldName + "].", parser.getTokenLocation());
}
} else if (token == XContentParser.Token.START_ARRAY) {
switch (currentFieldName) {
case "fielddataFields":
case "fielddata_fields":
fieldDataFieldsParseElement.parse(parser, subSearchContext);
break;
default:
throw new SearchParseException(context, "Unknown key for a " + token + " in [" + aggregationName + "]: ["
+ currentFieldName + "].", parser.getTokenLocation());
}
} else {
throw new SearchParseException(context, "Unexpected token " + token + " in [" + aggregationName + "].",
parser.getTokenLocation());
}
}
} catch (Exception e) {
throw ExceptionsHelper.convertToElastic(e);
}
return new TopHitsAggregator.Factory(aggregationName, fetchPhase, subSearchContext);
}
}