@Override public Filter parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
XContentParser parser = parseContext.parser();
Query query = null;
Filter filter = null;
float boost = 1.0f;
String scope = null;
String path = null;
boolean cache = false;
CacheKeyFilter.Key cacheKey = null;
String filterName = null;
// we need a late binding filter so we can inject a parent nested filter inner nested queries
NestedQueryParser.LateBindingParentFilter currentParentFilterContext = NestedQueryParser.parentFilterContext.get();
NestedQueryParser.LateBindingParentFilter usAsParentFilter = new NestedQueryParser.LateBindingParentFilter();
NestedQueryParser.parentFilterContext.set(usAsParentFilter);
String currentFieldName = null;
XContentParser.Token token;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token == XContentParser.Token.START_OBJECT) {
if ("query".equals(currentFieldName)) {
query = parseContext.parseInnerQuery();
} else if ("filter".equals(currentFieldName)) {
filter = parseContext.parseInnerFilter();
}
} else if (token.isValue()) {
if ("path".equals(currentFieldName)) {
path = parser.text();
} else if ("boost".equals(currentFieldName)) {
boost = parser.floatValue();
} else if ("_scope".equals(currentFieldName)) {
scope = parser.text();
} else if ("_name".equals(currentFieldName)) {
filterName = parser.text();
} else if ("_cache".equals(currentFieldName)) {
cache = parser.booleanValue();
} else if ("_cache_key".equals(currentFieldName) || "_cacheKey".equals(currentFieldName)) {
cacheKey = new CacheKeyFilter.Key(parser.text());
}
}
}
if (query == null && filter == null) {
throw new QueryParsingException(parseContext.index(), "[nested] requires either 'query' or 'filter' field");
}
if (path == null) {
throw new QueryParsingException(parseContext.index(), "[nested] requires 'path' field");
}
if (filter != null) {
query = new DeletionAwareConstantScoreQuery(filter);
}
query.setBoost(boost);
MapperService.SmartNameObjectMapper mapper = parseContext.mapperService().smartNameObjectMapper(path);
if (mapper == null) {
throw new QueryParsingException(parseContext.index(), "[nested] failed to find nested object under path [" + path + "]");
}
ObjectMapper objectMapper = mapper.mapper();
if (objectMapper == null) {
throw new QueryParsingException(parseContext.index(), "[nested] failed to find nested object under path [" + path + "]");
}
if (!objectMapper.nested().isNested()) {
throw new QueryParsingException(parseContext.index(), "[nested] nested object under path [" + path + "] is not of nested type");
}
Filter childFilter = parseContext.cacheFilter(objectMapper.nestedTypeFilter(), null);
usAsParentFilter.filter = childFilter;
// wrap the child query to only work on the nested path type
query = new FilteredQuery(query, childFilter);
Filter parentFilter = currentParentFilterContext;
if (parentFilter == null) {
parentFilter = NonNestedDocsFilter.INSTANCE;
if (mapper.hasDocMapper()) {
// filter based on the type...
parentFilter = mapper.docMapper().typeFilter();
}
parentFilter = parseContext.cacheFilter(parentFilter, null);
}
// restore the thread local one...
NestedQueryParser.parentFilterContext.set(currentParentFilterContext);
BlockJoinQuery joinQuery = new BlockJoinQuery(query, parentFilter, BlockJoinQuery.ScoreMode.None);
if (scope != null) {
SearchContext.current().addNestedQuery(scope, joinQuery);
}
Filter joinFilter = new QueryWrapperFilter(joinQuery);
if (cache) {
joinFilter = parseContext.cacheFilter(joinFilter, cacheKey);
}
if (filterName != null) {
parseContext.addNamedFilter(filterName, joinFilter);