Examples with NoIndexException com.baidu.hugegraph.exception.NoIndexException used on opensource projects

Example 1 with NoIndexException

use of com.baidu.hugegraph.exception.NoIndexException in project incubator-hugegraph by apache.

the class GraphIndexTransaction method queryByLabel.

@Watched(prefix = "index")
private IdHolderList queryByLabel(ConditionQuery query) {
    HugeType queryType = query.resultType();
    IndexLabel il = IndexLabel.label(queryType);
    validateIndexLabel(il);
    Id label = query.condition(HugeKeys.LABEL);
    assert label != null;
    HugeType indexType;
    SchemaLabel schemaLabel;
    if (queryType.isVertex()) {
        indexType = HugeType.VERTEX_LABEL_INDEX;
        schemaLabel = this.graph().vertexLabel(label);
    } else if (queryType.isEdge()) {
        indexType = HugeType.EDGE_LABEL_INDEX;
        schemaLabel = this.graph().edgeLabel(label);
    } else {
        throw new HugeException("Can't query %s by label", queryType);
    }
    if (!this.store().features().supportsQueryByLabel() && !schemaLabel.enableLabelIndex()) {
        throw new NoIndexException("Don't accept query by label '%s', " + "label index is disabled", schemaLabel);
    }
    ConditionQuery indexQuery = new ConditionQuery(indexType, query);
    indexQuery.eq(HugeKeys.INDEX_LABEL_ID, il.id());
    indexQuery.eq(HugeKeys.FIELD_VALUES, label);
    /*
         * We can avoid redundant element ids if set limit, but if there are
         * label index overridden by other vertices with different label,
         * query with limit like g.V().hasLabel('xx').limit(10) may lose some
         * results, so can't set limit here. But in this case, the following
         * query results may be still different:
         *   g.V().hasLabel('xx').count()  // label index count
         *   g.V().hasLabel('xx').limit(-1).count()  // actual vertices count
         * It’s a similar situation for the offset, like:
         *   g.V().hasLabel('xx').range(26, 27)
         *   g.V().hasLabel('xx').range(27, 28)
         * we just reset limit here, but don't reset offset due to performance
         * optimization with index+offset query, see Query.skipOffsetIfNeeded().
         * NOTE: if set offset the backend itself will skip the offset
         */
    indexQuery.copyBasic(query);
    indexQuery.limit(Query.NO_LIMIT);
    IdHolder idHolder = this.doIndexQuery(il, indexQuery);
    IdHolderList holders = new IdHolderList(query.paging());
    holders.add(idHolder);
    return holders;
}