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, $properties);
}
public function get($id)
{
$node = new Node($this, $id);
// Preload data before returning.
// NotFoundException will be thrown if:
// - the node does not exist
// SchemaException will be thrown if:
// - there's a mismatch between the requested node and the given schema
$node->fetch();
return $node;
}
public function setRelationship(Node $start_node, Node $end_node)
{
if ($start_node->hasId() and $start_node->getId() === $end_node->getId()) {
throw new Exceptions\SchemaException('A node may not have an edge to itself.');
}
if (!$this->schema->permits($start_node->getSchema(), $end_node->getSchema())) {
throw new Exceptions\SchemaException('Relationship between ' . $start_node->getSchema()->getName() . ' and ' . $end_node->getSchema()->getName() . ' forbidden by schema.');
}
$this->end_node = $end_node;
$this->start_node = $start_node;
}
public function process(Node $node)
{
$node->index();
}