Function addRelation

graphdb.js:365–494

(self, relation, indexA, indexB, callback)

}

function addRelation(self, relation, indexA, indexB, callback) {

	// Workflow:
	// Has "A" relation nodes?
	// Has "B" relation nodes?
	// Create "A" relation with "B"
	// Create "B" relation with "A"
	// Register relation to global relations

	var tasks = [];
	var relA = null;
	var relB = null;

	var tmprelation = { index: relation.index, pageindex: 0, documentindex: 0, locked: false, private: true };

	tasks.push(function(next) {
		self.read(indexA, function(err, doc, relid) {
			if (doc) {
				relA = relid;
				next();
			} else {
				tasks = null;
				next = null;
				callback(new Error('GraphDB: Node (A) "{0}" not exists.'.format(indexA)));
			}
		});
	});

	tasks.push(function(next) {
		self.read(indexB, function(err, doc, relid) {
			if (doc) {
				relB = relid;
				next();
			} else {
				tasks = null;
				next = null;
				callback(new Error('GraphDB: Node (B) "{0}" not exists.'.format(indexB)));
			}
		});
	});

	tasks.push(function(next) {

		if (relA == 0) {
			next();
			return;
		}

		checkRelation(self, relation, relA, indexB, function(err, is) {
			if (is) {
				tasks = null;
				next = null;
				callback(new Error('GraphDB: Same relation already exists between nodes (A) "{0}" and (B) "{1}".'.format(indexA, indexB)));
			} else
				next();
		});
	});