Function UpdateNodeLabels

src/graph/graph_hub.c:322–438

}

void UpdateNodeLabels
(
	GraphContext *gc,            // graph context to update the entity
	Node *node,                  // the node to be updated
	const char **add_labels,     // labels to add to the node
	const char **remove_labels,  // labels to add to the node
	uint n_add_labels,           // number of labels to add
	uint n_remove_labels,        // number of labels to remove
	bool log                     // log this operation in undo-log
) {
	ASSERT(gc   != NULL);
	ASSERT(node != NULL);

	// quick return if there are no labels
	if(add_labels == NULL && remove_labels == NULL) {
		return;
	}

	// if add_labels is specified its count must be > 0
	ASSERT((add_labels != NULL && n_add_labels > 0) ||
		   (add_labels == NULL && n_add_labels == 0));

	// if remove_labels is specified its count must be > 0
	ASSERT((remove_labels != NULL && n_remove_labels > 0) ||
		   (remove_labels == NULL && n_remove_labels == 0));

	EffectsBuffer *eb = NULL; 
	UndoLog undo_log  = NULL;

	if(log == true) {
		eb = QueryCtx_GetEffectsBuffer();
		undo_log = QueryCtx_GetUndoLog();
	}

	if(add_labels != NULL) {
		int add_labels_ids[n_add_labels];
		uint add_labels_index = 0;

		for (uint i = 0; i < n_add_labels; i++) {
			const char *label = add_labels[i];
			// get or create label matrix
			const Schema *s = GraphContext_GetSchema(gc, label, SCHEMA_NODE);
			bool schema_created = false;
			if(s == NULL) {
				s = AddSchema(gc, label, SCHEMA_NODE, log);
				schema_created = true;
			}

			int  schema_id = Schema_GetID(s);
			bool node_labeled = Graph_IsNodeLabeled(gc->g, ENTITY_GET_ID(node),
					schema_id);

			if(!node_labeled) {
				// sync matrix
				// make sure label matrix is of the right dimensions
				if(schema_created) {
					RG_Matrix m = Graph_GetLabelMatrix(gc->g, schema_id);
				}