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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.index.query.support;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.query.QueryParseContext;
import org.elasticsearch.index.query.QueryParsingException;
import org.elasticsearch.search.fetch.fielddata.FieldDataFieldsParseElement;
import org.elasticsearch.search.fetch.innerhits.InnerHitsSubSearchContext;
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 InnerHitsQueryParserHelper {
private final SortParseElement sortParseElement;
private final FetchSourceParseElement sourceParseElement;
private final HighlighterParseElement highlighterParseElement;
private final ScriptFieldsParseElement scriptFieldsParseElement;
private final FieldDataFieldsParseElement fieldDataFieldsParseElement;
@Inject
public InnerHitsQueryParserHelper(SortParseElement sortParseElement, FetchSourceParseElement sourceParseElement, HighlighterParseElement highlighterParseElement, ScriptFieldsParseElement scriptFieldsParseElement, FieldDataFieldsParseElement fieldDataFieldsParseElement) {
this.sortParseElement = sortParseElement;
this.sourceParseElement = sourceParseElement;
this.highlighterParseElement = highlighterParseElement;
this.scriptFieldsParseElement = scriptFieldsParseElement;
this.fieldDataFieldsParseElement = fieldDataFieldsParseElement;
}
public InnerHitsSubSearchContext parse(QueryParseContext parserContext) throws IOException, QueryParsingException {
String fieldName = null;
XContentParser.Token token;
String innerHitName = null;
SubSearchContext subSearchContext = new SubSearchContext(SearchContext.current());
try {
XContentParser parser = parserContext.parser();
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
fieldName = parser.currentName();
} else if (token.isValue()) {
if ("name".equals(fieldName)) {
innerHitName = parser.textOrNull();
} else {
parseCommonInnerHitOptions(parser, token, fieldName, subSearchContext, sortParseElement, sourceParseElement, highlighterParseElement, scriptFieldsParseElement, fieldDataFieldsParseElement);
}
} else {
parseCommonInnerHitOptions(parser, token, fieldName, subSearchContext, sortParseElement, sourceParseElement, highlighterParseElement, scriptFieldsParseElement, fieldDataFieldsParseElement);
}
}
} catch (Exception e) {
throw new QueryParsingException(parserContext, "Failed to parse [_inner_hits]", e);
}
return new InnerHitsSubSearchContext(innerHitName, subSearchContext);
}
public static void parseCommonInnerHitOptions(XContentParser parser, XContentParser.Token token, String fieldName, SubSearchContext subSearchContext,
SortParseElement sortParseElement, FetchSourceParseElement sourceParseElement, HighlighterParseElement highlighterParseElement,
ScriptFieldsParseElement scriptFieldsParseElement, FieldDataFieldsParseElement fieldDataFieldsParseElement) throws Exception {
if ("sort".equals(fieldName)) {
sortParseElement.parse(parser, subSearchContext);
} else if ("_source".equals(fieldName)) {
sourceParseElement.parse(parser, subSearchContext);
} else if (token == XContentParser.Token.START_OBJECT) {
switch (fieldName) {
case "highlight":
highlighterParseElement.parse(parser, subSearchContext);
break;
case "scriptFields":
case "script_fields":
scriptFieldsParseElement.parse(parser, subSearchContext);
break;
default:
throw new IllegalArgumentException("Unknown key for a " + token + " for nested query: [" + fieldName + "].");
}
} else if (token == XContentParser.Token.START_ARRAY) {
switch (fieldName) {
case "fielddataFields":
case "fielddata_fields":
fieldDataFieldsParseElement.parse(parser, subSearchContext);
break;
case "fields":
boolean added = false;
while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
String name = parser.text();
added = true;
subSearchContext.fieldNames().add(name);
}
if (!added) {
subSearchContext.emptyFieldNames();
}
break;
default:
throw new IllegalArgumentException("Unknown key for a " + token + " for nested query: [" + fieldName + "].");
}
} else if (token.isValue()) {
switch (fieldName) {
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;
case "fields":
subSearchContext.fieldNames().add(parser.text());
break;
default:
throw new IllegalArgumentException("Unknown key for a " + token + " for nested query: [" + fieldName + "].");
}
}
}
}