I want to iterate through nested objects using RecursiveIterator interface. HeadHunterEntity object can have many CandidateEntities. I want to iterate all CandidateEntities in main loop, but something is wrong.
I have main loop like this:
$iterator = new RecursiveIteratorIterator(new RecursiveHunterCandidatesIterator(new RecursiveArrayIterator($this->getHeadHunters())));
foreach ($iterator as $object) {
echo('<br>MAIN LOOP: ' . (is_object($object) ? get_class($object) : $object));
}
RecursiveHunterCandidatesIterator
class RecursiveHunterCandidatesIterator extends RecursiveFilterIterator {
public function accept() {
echo "<br>RecursiveHunterCandidatesIterator (accept) hasChildren: " . $this->hasChildren();
return $this->hasChildren();
}
public function hasChildren() {
$current = $this->current();
echo "<br>RecursiveHunterCandidatesIterator (hasChildren) current Class: " . get_class($current);
return is_object($this->current()) ? (boolean)count($this->current()->getHuntedCandidates()) : FALSE;
}
public function getChildren() {
echo "<br>RecursiveHunterCandidatesIterator (getChildren) count: " . count($this->current()->getHuntedCandidates());
$childIterator = new RecursiveArrayIterator($this->current()->getHuntedCandidates());
$childIterator2 = new RecursiveArrayIterator(array(1,2,3));
return $childIterator;
}
}
The result is unexpected, I have nothin in main loop :(
RecursiveHunterCandidatesIterator (hasChildren) current Class: HeadHunterEntity
RecursiveHunterCandidatesIterator (accept) hasChildren: 1
RecursiveHunterCandidatesIterator (hasChildren) current Class: HeadHunterEntity
RecursiveHunterCandidatesIterator (hasChildren) current Class: HeadHunterEntity
RecursiveHunterCandidatesIterator (getChildren) count: 2
RecursiveHunterCandidatesIterator (hasChildren) current Class: HeadHunterEntity
RecursiveHunterCandidatesIterator (accept) hasChildren:
RecursiveHunterCandidatesIterator (hasChildren) current Class: HeadHunterEntity
RecursiveHunterCandidatesIterator (hasChildren) current Class: HeadHunterEntity
RecursiveHunterCandidatesIterator (accept) hasChildren:
RecursiveHunterCandidatesIterator (hasChildren) current Class: HeadHunterEntity
But if I return $childIterator2 instead, there are results in main loop as expected:
RecursiveHunterCandidatesIterator (hasChildren) current Class: HeadHunterEntity
RecursiveHunterCandidatesIterator (accept) hasChildren: 1
RecursiveHunterCandidatesIterator (hasChildren) current Class: HeadHunterEntity
RecursiveHunterCandidatesIterator (hasChildren) current Class: HeadHunterEntity
RecursiveHunterCandidatesIterator (getChildren) count: 2
MAIN LOOP: 1
MAIN LOOP: 2
MAIN LOOP: 3
RecursiveHunterCandidatesIterator (hasChildren) current Class: HeadHunterEntity
RecursiveHunterCandidatesIterator (accept) hasChildren:
RecursiveHunterCandidatesIterator (hasChildren) current Class: HeadHunterEntity
RecursiveHunterCandidatesIterator (hasChildren) current Class: HeadHunterEntity
RecursiveHunterCandidatesIterator (accept) hasChildren:
RecursiveHunterCandidatesIterator (hasChildren) current Class: HeadHunterEntity
$this->current()->getHuntedCandidates() returns array, so it should be in main loop like fake 1,2,3 aray in $childIterator2...
What do I do wrong ?
I have found a solution. As getChildren() method of RecursiveIterator, has to return instance of RecursiveIterator, I have extended RecursiveArrayIterator (You can also extend RecursiveFilterIterator if you need to filter objects on this level).
class CandidateIterator extends RecursiveArrayIterator {
public function hasChildren() {
return false;
}
}
and of course change returned iterator in RecursiveHunterCandidatesIterator class:
class RecursiveHunterCandidatesIterator extends RecursiveFilterIterator {
(..)
public function getChildren() {
$childIterator = new CandidateIterator(new RecursiveArrayIterator($this->current()->getHuntedCandidates()));
return $childIterator;
}
}
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