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<?php |
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namespace prgTW\BaseCRM\Resource; |
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class PagingIterator implements \Iterator, \Countable |
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{ |
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/** @var callable */ |
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protected $generator; |
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/** @var array */ |
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protected $args; |
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/** @var int */ |
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protected $page; |
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/** @var array */ |
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protected $query; |
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/** @var ResourceCollection */ |
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protected $resourceCollection; |
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/** |
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* @param callable $generator |
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* @param int $page |
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* @param array $query |
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* |
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* @throws \InvalidArgumentException when generator is not callable |
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*/ |
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public function __construct($generator, $page, array $query = []) |
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{ |
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if (false === is_callable($generator)) |
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{ |
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//@codeCoverageIgnoreStart |
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throw new \InvalidArgumentException('Generator is not callable'); |
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//@codeCoverageIgnoreEnd |
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} |
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$this->generator = $generator; |
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$this->args = array( |
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'page' => $page, |
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'query' => $query, |
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); |
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$this->reset(); |
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} |
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protected function reset() |
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{ |
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$this->page = $this->args['page']; |
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$this->query = $this->args['query']; |
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$this->resourceCollection = null; |
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} |
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/** {@inheritdoc} */ |
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public function current() |
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{ |
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return $this->resourceCollection->current(); |
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} |
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/** {@inheritdoc} */ |
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public function key() |
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{ |
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return $this->resourceCollection->key(); |
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} |
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/** {@inheritdoc} */ |
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public function next() |
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{ |
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$this->loadIfNecessary(); |
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return $this->resourceCollection->next(); |
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} |
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/** {@inheritdoc} */ |
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public function valid() |
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{ |
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$this->loadIfNecessary(); |
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return null !== $this->key(); |
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} |
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/** {@inheritdoc} */ |
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public function rewind() |
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{ |
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$this->reset(); |
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} |
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/** {@inheritdoc} */ |
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public function count() |
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{ |
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return $this->resourceCollection->count(); |
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} |
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protected function loadIfNecessary() |
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{ |
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if (false === $this->isLoadNecessary()) |
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{ |
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return; |
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} |
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/** @var Page $page */ |
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$page = call_user_func_array($this->generator, array( |
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$this->page, |
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$this->query, |
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)); |
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$this->resourceCollection = $page->getResourceCollection(); |
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++$this->page; |
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} |
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/** |
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* @return bool |
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*/ |
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protected function isLoadNecessary() |
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{ |
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return null === $this->resourceCollection; |
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} |
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} |
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prgTW /
basecrm-php-api
