final Optional getDefaultSortClause()

in aliyun-sdk-opensearch/src/main/java/com/aliyun/opensearch/search/AbstractSubClausesBuilder.java [199:227]

• 29 lines of code
• 6 McCabe index (conditional complexity)

	final Optional<String> getDefaultSortClause() {
		Optional<String> sortClause = Optional.absent();
		if (params.isSetSort()) {
			Sort sort = params.getSort();
			if (sort.isSetSortFields()) {
				StringBuilder sortBuilder = new StringBuilder(SortClauseKey).append("=");
				List<SortField> sortFields = sort.getSortFields();
				List<String> sortStrings = Lists.newArrayList();
				for (SortField sortField : sortFields) {
					String field = sortField.getField();
					Order orderEnum = sortField.getOrder();
					String order;
					switch (orderEnum) {
					case INCREASE:
						order = SORT_CLAUSE_INCREASE;
						break;
					case DECREASE:
						order = SORT_CLAUSE_DECREASE;
						break;
					default:
						throw new IllegalArgumentException("unknow order: " + orderEnum);
					}
					sortStrings.add(order + field);
				}
				sortClause = Optional.of(sortBuilder.append(Joiner.on(";").join(sortStrings)).toString());
			}
		}
		return sortClause;
	}