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PhabricatorEdgeObjectQuery.php
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Mon, May 6, 04:26

PhabricatorEdgeObjectQuery.php
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<?php
/**
* This is a more formal version of @{class:PhabricatorEdgeQuery} that is used
* to expose edges to Conduit.
*/
final class PhabricatorEdgeObjectQuery
extends PhabricatorCursorPagedPolicyAwareQuery {
private $sourcePHIDs;
private $sourcePHIDType;
private $edgeTypes;
private $destinationPHIDs;
public function withSourcePHIDs(array $source_phids) {
$this->sourcePHIDs = $source_phids;
return $this;
}
public function withEdgeTypes(array $types) {
$this->edgeTypes = $types;
return $this;
}
public function withDestinationPHIDs(array $destination_phids) {
$this->destinationPHIDs = $destination_phids;
return $this;
}
protected function willExecute() {
$source_phids = $this->sourcePHIDs;
if (!$source_phids) {
throw new Exception(
pht(
'Edge object query must be executed with a nonempty list of '.
'source PHIDs.'));
}
$phid_item = null;
$phid_type = null;
foreach ($source_phids as $phid) {
$this_type = phid_get_type($phid);
if ($this_type == PhabricatorPHIDConstants::PHID_TYPE_UNKNOWN) {
throw new Exception(
pht(
'Source PHID "%s" in edge object query has unknown PHID type.',
$phid));
}
if ($phid_type === null) {
$phid_type = $this_type;
$phid_item = $phid;
continue;
}
if ($phid_type !== $this_type) {
throw new Exception(
pht(
'Two source PHIDs ("%s" and "%s") have different PHID types '.
'("%s" and "%s"). All PHIDs must be of the same type to execute '.
'an edge object query.',
$phid_item,
$phid,
$phid_type,
$this_type));
}
}
$this->sourcePHIDType = $phid_type;
}
protected function loadPage() {
$type = $this->sourcePHIDType;
$conn = PhabricatorEdgeConfig::establishConnection($type, 'r');
$table = PhabricatorEdgeConfig::TABLE_NAME_EDGE;
$rows = $this->loadStandardPageRowsWithConnection($conn, $table);
$result = array();
foreach ($rows as $row) {
$result[] = PhabricatorEdgeObject::newFromRow($row);
}
return $result;
}
protected function buildWhereClauseParts(AphrontDatabaseConnection $conn) {
$parts = parent::buildWhereClauseParts($conn);
$parts[] = qsprintf(
$conn,
'src IN (%Ls)',
$this->sourcePHIDs);
$parts[] = qsprintf(
$conn,
'type IN (%Ls)',
$this->edgeTypes);
if ($this->destinationPHIDs !== null) {
$parts[] = qsprintf(
$conn,
'dst IN (%Ls)',
$this->destinationPHIDs);
}
return $parts;
}
public function getQueryApplicationClass() {
return null;
}
protected function getPrimaryTableAlias() {
return 'edge';
}
public function getOrderableColumns() {
return array(
'dateCreated' => array(
'table' => 'edge',
'column' => 'dateCreated',
'type' => 'int',
),
'sequence' => array(
'table' => 'edge',
'column' => 'seq',
'type' => 'int',
// TODO: This is not actually unique, but we're just doing our best
// here.
'unique' => true,
),
);
}
protected function getDefaultOrderVector() {
return array('dateCreated', 'sequence');
}
protected function newInternalCursorFromExternalCursor($cursor) {
list($epoch, $sequence) = $this->parseCursor($cursor);
// Instead of actually loading an edge, we're just making a fake edge
// with the properties the cursor describes.
$edge_object = PhabricatorEdgeObject::newFromRow(
array(
'dateCreated' => $epoch,
'seq' => $sequence,
));
return id(new PhabricatorQueryCursor())
->setObject($edge_object);
}
protected function newPagingMapFromPartialObject($object) {
return array(
'dateCreated' => $object->getDateCreated(),
'sequence' => $object->getSequence(),
);
}
protected function newExternalCursorStringForResult($object) {
return sprintf(
'%d_%d',
$object->getDateCreated(),
$object->getSequence());
}
private function parseCursor($cursor) {
if (!preg_match('/^\d+_\d+\z/', $cursor)) {
$this->throwCursorException(
pht(
'Expected edge cursor in the form "0123_6789", got "%s".',
$cursor));
}
return explode('_', $cursor);
}
}

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