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Editing File: /home/ubuntu/code_review/phabricator/src/applications/differential/query/DifferentialHunkQuery.php

<?php

final class DifferentialHunkQuery
  extends PhabricatorCursorPagedPolicyAwareQuery {

private $changesets;
  private $shouldAttachToChangesets;

public function withChangesets(array $changesets) {
    assert_instances_of($changesets, 'DifferentialChangeset');
    $this->changesets = $changesets;
    return $this;
  }

public function needAttachToChangesets($attach) {
    $this->shouldAttachToChangesets = $attach;
    return $this;
  }

protected function willExecute() {
    // If we fail to load any hunks at all (for example, because all of
    // the requested changesets are directories or empty files and have no
    // hunks) we'll never call didFilterPage(), and thus never have an
    // opportunity to attach hunks. Attach empty hunk lists now so that we
    // end up with the right result.
    if ($this->shouldAttachToChangesets) {
      foreach ($this->changesets as $changeset) {
        $changeset->attachHunks(array());
      }
    }
  }

public function newResultObject() {
    return new DifferentialHunk();
  }

protected function loadPage() {
    return $this->loadStandardPage($this->newResultObject());
  }

protected function willFilterPage(array $hunks) {
    $changesets = mpull($this->changesets, null, 'getID');
    foreach ($hunks as $key => $hunk) {
      $changeset = idx($changesets, $hunk->getChangesetID());
      if (!$changeset) {
        unset($hunks[$key]);
      }
      $hunk->attachChangeset($changeset);
    }

return $hunks;
  }

protected function didFilterPage(array $hunks) {
    if ($this->shouldAttachToChangesets) {
      $hunk_groups = mgroup($hunks, 'getChangesetID');
      foreach ($this->changesets as $changeset) {
        $hunks = idx($hunk_groups, $changeset->getID(), array());
        $changeset->attachHunks($hunks);
      }
    }

return $hunks;
  }

protected function buildWhereClauseParts(AphrontDatabaseConnection $conn) {
    $where = parent::buildWhereClauseParts($conn);

if (!$this->changesets) {
      throw new Exception(
        pht(
          'You must load hunks via changesets, with %s!',
          'withChangesets()'));
    }

$where[] = qsprintf(
      $conn,
      'changesetID IN (%Ld)',
      mpull($this->changesets, 'getID'));

return $where;
  }

public function getQueryApplicationClass() {
    return 'PhabricatorDifferentialApplication';
  }

protected function getDefaultOrderVector() {
    // TODO: Do we need this?
    return array('-id');
  }

}

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