@Override
public Query parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
ensureNotDeleteByQuery(NAME, parseContext);
XContentParser parser = parseContext.parser();
boolean queryFound = false;
float boost = 1.0f;
String childType = null;
ScoreType scoreType = ScoreType.NONE;
int minChildren = 0;
int maxChildren = 0;
int shortCircuitParentDocSet = 8192;
String queryName = null;
Tuple<String, SubSearchContext> innerHits = null;
String currentFieldName = null;
XContentParser.Token token;
XContentStructure.InnerQuery iq = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token == XContentParser.Token.START_OBJECT) {
// Usually, the query would be parsed here, but the child
// type may not have been extracted yet, so use the
// XContentStructure.<type> facade to parse if available,
// or delay parsing if not.
if ("query".equals(currentFieldName)) {
iq =
new XContentStructure.InnerQuery(
parseContext, childType == null ? null : new String[] {childType});
queryFound = true;
} else if ("inner_hits".equals(currentFieldName)) {
innerHits = innerHitsQueryParserHelper.parse(parseContext);
} else {
throw new QueryParsingException(
parseContext.index(),
"[has_child] query does not support [" + currentFieldName + "]");
}
} else if (token.isValue()) {
if ("type".equals(currentFieldName)
|| "child_type".equals(currentFieldName)
|| "childType".equals(currentFieldName)) {
childType = parser.text();
} else if ("score_type".equals(currentFieldName) || "scoreType".equals(currentFieldName)) {
scoreType = ScoreType.fromString(parser.text());
} else if ("score_mode".equals(currentFieldName) || "scoreMode".equals(currentFieldName)) {
scoreType = ScoreType.fromString(parser.text());
} else if ("boost".equals(currentFieldName)) {
boost = parser.floatValue();
} else if ("min_children".equals(currentFieldName)
|| "minChildren".equals(currentFieldName)) {
minChildren = parser.intValue(true);
} else if ("max_children".equals(currentFieldName)
|| "maxChildren".equals(currentFieldName)) {
maxChildren = parser.intValue(true);
} else if ("short_circuit_cutoff".equals(currentFieldName)) {
shortCircuitParentDocSet = parser.intValue();
} else if ("_name".equals(currentFieldName)) {
queryName = parser.text();
} else {
throw new QueryParsingException(
parseContext.index(),
"[has_child] query does not support [" + currentFieldName + "]");
}
}
}
if (!queryFound) {
throw new QueryParsingException(parseContext.index(), "[has_child] requires 'query' field");
}
if (childType == null) {
throw new QueryParsingException(parseContext.index(), "[has_child] requires 'type' field");
}
Query innerQuery = iq.asQuery(childType);
if (innerQuery == null) {
return null;
}
innerQuery.setBoost(boost);
DocumentMapper childDocMapper = parseContext.mapperService().documentMapper(childType);
if (childDocMapper == null) {
throw new QueryParsingException(
parseContext.index(), "[has_child] No mapping for for type [" + childType + "]");
}
if (!childDocMapper.parentFieldMapper().active()) {
throw new QueryParsingException(
parseContext.index(),
"[has_child] Type [" + childType + "] does not have parent mapping");
}
if (innerHits != null) {
InnerHitsContext.ParentChildInnerHits parentChildInnerHits =
new InnerHitsContext.ParentChildInnerHits(
innerHits.v2(), innerQuery, null, childDocMapper);
String name = innerHits.v1() != null ? innerHits.v1() : childType;
parseContext.addInnerHits(name, parentChildInnerHits);
}
ParentFieldMapper parentFieldMapper = childDocMapper.parentFieldMapper();
if (!parentFieldMapper.active()) {
throw new QueryParsingException(
parseContext.index(), "[has_child] _parent field not configured");
}
String parentType = parentFieldMapper.type();
DocumentMapper parentDocMapper = parseContext.mapperService().documentMapper(parentType);
if (parentDocMapper == null) {
throw new QueryParsingException(
parseContext.index(),
"[has_child] Type ["
+ childType
+ "] points to a non existent parent type ["
+ parentType
+ "]");
}
if (maxChildren > 0 && maxChildren < minChildren) {
throw new QueryParsingException(
parseContext.index(), "[has_child] 'max_children' is less than 'min_children'");
}
BitDocIdSetFilter nonNestedDocsFilter = null;
if (parentDocMapper.hasNestedObjects()) {
nonNestedDocsFilter = parseContext.bitsetFilter(NonNestedDocsFilter.INSTANCE);
}
// wrap the query with type query
innerQuery =
new FilteredQuery(
innerQuery,
parseContext.cacheFilter(
childDocMapper.typeFilter(), null, parseContext.autoFilterCachePolicy()));
Query query;
Filter parentFilter =
parseContext.cacheFilter(
parentDocMapper.typeFilter(), null, parseContext.autoFilterCachePolicy());
ParentChildIndexFieldData parentChildIndexFieldData =
parseContext.getForField(parentFieldMapper);
if (minChildren > 1 || maxChildren > 0 || scoreType != ScoreType.NONE) {
query =
new ChildrenQuery(
parentChildIndexFieldData,
parentType,
childType,
parentFilter,
innerQuery,
scoreType,
minChildren,
maxChildren,
shortCircuitParentDocSet,
nonNestedDocsFilter);
} else {
query =
new ChildrenConstantScoreQuery(
parentChildIndexFieldData,
innerQuery,
parentType,
childType,
parentFilter,
shortCircuitParentDocSet,
nonNestedDocsFilter);
}
if (queryName != null) {
parseContext.addNamedFilter(queryName, new CustomQueryWrappingFilter(query));
}
query.setBoost(boost);
return query;
}
