public function __construct(EdgeSchema $edge_schema, Node $node, $direction = self::ALL, array $properties = null)
{
if (!$node->hasId()) {
throw new \InvalidArgumentException('Cannot get an edge collection from a node with no ID.');
}
$node_schema = $node->getSchema();
switch ($direction) {
case self::OUT:
if (!$edge_schema->permitsStartNode($node_schema)) {
throw new Exceptions\SchemaException('The schema for edges of type "' . $edge_schema->getName() . '" does not permit edges from nodes of type "' . $node_schema->getName() . '".');
}
break;
case self::IN:
if (!$edge_schema->permitsEndNode($node_schema)) {
throw new Exceptions\SchemaException('The schema for edges of type "' . $edge_schema->getName() . '" does not permit edges to nodes of type "' . $node_schema->getName() . '".');
}
break;
case self::ALL:
if (!$edge_schema->permitsEndNode($node_schema) and !$edge_schema->permitsStartNode($node_schema)) {
throw new Exceptions\SchemaException('The schema for edges of type "' . $edge_schema->getName() . '" does not permit edges to or from nodes of type "' . $node_schema->getName() . '".');
}
break;
default:
throw new \RuntimeException('Invalid direction: "' . $direction . '".');
}
$this->node = $node;
$this->direction = $direction;
parent::__construct($edge_schema, $properties);
}
