/**
* Prepare the next item in our collection.
* @return null
*/
public function next()
{
// If, after moving to the next item in $models we end up with a blank, then
// try looking at the next queued element
next($this->models);
if (!current($this->models)) {
// See if a queue element is already active
if ($this->active !== null) {
// It's a normal array so move the whole lot into $models. We can't use
// array_merge here is the unique flag is set as we need to prevent
// duplicates from being added to $this->models, so need to check the
// persistent IDs.
if (is_array($this->active)) {
if ($this->isUnique) {
foreach ($this->active as $m) {
if ($m->isInDatabase()) {
$pId = $m->getPersistentId();
if (!isset($this->persistentModels[$pId])) {
$this->models[] = $this->persistentModels[$pId] = $m;
}
} else {
$this->models[] = $m;
}
}
} else {
$this->models = array_merge($this->models, $this->active);
}
$this->active = null;
} else {
if ($this->active instanceof \stdClass) {
if ($record = $this->active->stmt->fetch(\PDO::FETCH_ASSOC)) {
$model = Model::create($this->active->modelName);
$model->populateFromArray($record);
$model->isInDatabase(true);
$model->hasChanged(false);
$pId = $model->isInDatabase() ? $model->getPersistentId() : null;
if ($this->isUnique && $pId !== null && isset($this->persistentModels[$pId])) {
return $this->next();
} else {
$this->models[] = $model;
}
} else {
$this->active->stmt->closeCursor();
$this->active->stmt = null;
$this->active = null;
}
} else {
if ($this->active instanceof ModelCollection) {
if ($this->active->valid() && ($data = $this->active->current())) {
$this->active->next();
$pId = $data->isInDatabase() ? $data->getPersistentId() : null;
if ($this->isUnique && $pId !== null && isset($this->persistentModels[$pId])) {
$this->next();
return null;
} else {
$this->models[] = $data;
}
} else {
$this->active = null;
$this->next();
}
}
}
}
} else {
if (!empty($this->queue)) {
$this->active = array_shift($this->queue);
$this->next();
}
}
}
return null;
}
