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PhabricatorEdgeType.php
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Wed, Aug 21, 05:29

PhabricatorEdgeType.php
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<?php
/**
* Defines an edge type.
*
* Edges are typed, directed connections between two objects. They are used to
* represent most simple relationships, like when a user is subscribed to an
* object or an object is a member of a project.
*
* @task load Loading Types
*/
abstract class PhabricatorEdgeType extends Phobject {
// TODO: Make this final after we remove PhabricatorLegacyEdgeType.
/* final */ public function getEdgeConstant() {
$class = new ReflectionClass($this);
$const = $class->getConstant('EDGECONST');
if ($const === false) {
throw new Exception(
pht(
'EdgeType class "%s" must define an EDGECONST property.',
get_class($this)));
}
if (!is_int($const) || ($const <= 0)) {
throw new Exception(
pht(
'EdgeType class "%s" has an invalid EDGECONST property. Edge '.
'constants must be positive integers.',
get_class($this)));
}
return $const;
}
public function getInverseEdgeConstant() {
return null;
}
public function shouldPreventCycles() {
return false;
}
public function shouldWriteInverseTransactions() {
return false;
}
public function getTransactionAddString(
$actor,
$add_count,
$add_edges) {
return pht(
'%s added %s edge(s): %s.',
$actor,
$add_count,
$add_edges);
}
public function getTransactionRemoveString(
$actor,
$rem_count,
$rem_edges) {
return pht(
'%s removed %s edge(s): %s.',
$actor,
$rem_count,
$rem_edges);
}
public function getTransactionEditString(
$actor,
$total_count,
$add_count,
$add_edges,
$rem_count,
$rem_edges) {
return pht(
'%s edited %s edge(s), added %s: %s; removed %s: %s.',
$actor,
$total_count,
$add_count,
$add_edges,
$rem_count,
$rem_edges);
}
public function getFeedAddString(
$actor,
$object,
$add_count,
$add_edges) {
return pht(
'%s added %s edge(s) to %s: %s.',
$actor,
$add_count,
$object,
$add_edges);
}
public function getFeedRemoveString(
$actor,
$object,
$rem_count,
$rem_edges) {
return pht(
'%s removed %s edge(s) from %s: %s.',
$actor,
$rem_count,
$object,
$rem_edges);
}
public function getFeedEditString(
$actor,
$object,
$total_count,
$add_count,
$add_edges,
$rem_count,
$rem_edges) {
return pht(
'%s edited %s edge(s) for %s, added %s: %s; removed %s: %s.',
$actor,
$total_count,
$object,
$add_count,
$add_edges,
$rem_count,
$rem_edges);
}
/* -( Loading Types )------------------------------------------------------ */
/**
* @task load
*/
public static function getAllTypes() {
static $type_map;
if ($type_map === null) {
$types = id(new PhutilSymbolLoader())
->setAncestorClass(__CLASS__)
->loadObjects();
$map = array();
// TODO: Remove this once everything is migrated.
$exclude = mpull($types, 'getEdgeConstant');
$map = PhabricatorEdgeConfig::getLegacyTypes($exclude);
unset($types['PhabricatorLegacyEdgeType']);
foreach ($types as $class => $type) {
$const = $type->getEdgeConstant();
if (isset($map[$const])) {
throw new Exception(
pht(
'Two edge types ("%s", "%s") share the same edge constant '.
'(%d). Each edge type must have a unique constant.',
$class,
get_class($map[$const]),
$const));
}
$map[$const] = $type;
}
// Check that all the inverse edge definitions actually make sense. If
// edge type A says B is its inverse, B must exist and say that A is its
// inverse.
foreach ($map as $const => $type) {
$inverse = $type->getInverseEdgeConstant();
if ($inverse === null) {
continue;
}
if (empty($map[$inverse])) {
throw new Exception(
pht(
'Edge type "%s" ("%d") defines an inverse type ("%d") which '.
'does not exist.',
get_class($type),
$const,
$inverse));
}
$inverse_inverse = $map[$inverse]->getInverseEdgeConstant();
if ($inverse_inverse !== $const) {
throw new Exception(
pht(
'Edge type "%s" ("%d") defines an inverse type ("%d"), but that '.
'inverse type defines a different type ("%d") as its '.
'inverse.',
get_class($type),
$const,
$inverse,
$inverse_inverse));
}
}
$type_map = $map;
}
return $type_map;
}
/**
* @task load
*/
public static function getByConstant($const) {
$type = idx(self::getAllTypes(), $const);
if (!$type) {
throw new Exception(
pht('Unknown edge constant "%s"!', $const));
}
return $type;
}
}

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