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| <?php
class PagingJsonIterator implements Iterator
{
protected $http;
protected $url;
protected $pageSize;
protected $totalCount;
public $jsonVarTotal = 'total';
public $jsonVarStartAt = 'startAt';
public $jsonVarPageSize = 'maxResults';
public $jsonVarData = 'issues';
public function __construct(HTTP_Request2 $http, $url, $pageSize = 50)
{
$this->http = $http;
$this->url = $url;
$this->pageSize = $pageSize;
}
public function rewind()
{
$this->position = 0;
$this->loadData();
}
public function current()
{
return $this->data[$this->position - $this->dataPos];
}
public function key()
{
return $this->position;
}
public function next()
{
++$this->position;
}
public function valid()
{
if (isset($this->data[$this->position - $this->dataPos])) {
return true;
}
if ($this->position >= $this->totalCount) {
//no more data
return false;
}
$this->loadData();
return isset($this->data[$this->position - $this->dataPos]);
}
protected function loadData()
{
$hreq = clone $this->http;
$hreq->setUrl(
str_replace(
array('{startAt}', '{pageSize}'),
array($this->position, $this->pageSize),
$this->url
)
);
$res = $hreq->send();
$obj = json_decode($res->getBody());
$this->totalCount = $obj->{$this->jsonVarTotal};
$this->data = $obj->{$this->jsonVarData};
$this->dataPos = $this->position;
}
}
?>
|
