Function ApplyDeleteEdge

src/effects/effects_apply.c:435–483

process DeleteNode effect

// process DeleteNode effect
static void ApplyDeleteEdge
(
	FILE *stream,     // effects stream
	GraphContext *gc  // graph to operate on
) {
	//--------------------------------------------------------------------------
	// effect format:
	//    edge ID
	//    relation ID
	//    src ID
	//    dest ID
	//--------------------------------------------------------------------------

	Edge e;  // edge to delete

	EntityID id   = INVALID_ENTITY_ID;       // edge ID
	int      r_id = GRAPH_UNKNOWN_RELATION;  // edge rel-type
	NodeID   s_id = INVALID_ENTITY_ID;       // edge src node ID
	NodeID   t_id = INVALID_ENTITY_ID;       // edge dest node ID

	int res;
	UNUSED(res);

	Graph *g = gc->g;  // graph to delete edge from

	// read edge ID
	fread_assert(&id, sizeof(EntityID), stream);

	// read relation ID
	fread_assert(&r_id, sizeof(RelationID), stream);

	// read src node ID
	fread_assert(&s_id, sizeof(EntityID), stream);

	// read dest node ID
	fread_assert(&t_id, sizeof(EntityID), stream);

	// get edge from the graph
	res = Graph_GetEdge(g, id, (Edge*)&e);
	ASSERT(res != 0);

	// set edge relation, src and destination node
	Edge_SetSrcNodeID(&e, s_id);
	Edge_SetDestNodeID(&e, t_id);
	Edge_SetRelationID(&e, r_id);

	// delete edge
	DeleteEdges(gc, &e, 1, false);
}

// returns false in case of effect encode/decode version mismatch
static bool ValidateVersion