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<?php declare(strict_types=1); |
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namespace Igni\Storage\Mapping\Collection; |
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use ArrayIterator; |
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use Igni\Storage\Driver\Cursor; |
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use Igni\Storage\Exception\CollectionException; |
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/** |
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* Lazy collection fetches items from cursor only if the item is requested and it is immutable. |
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* |
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* @package Igni\Storage\Mapping\Collection |
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*/ |
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class LazyCollection implements \Igni\Storage\Mapping\Collection |
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{ |
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protected $cursor; |
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protected $length; |
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protected $current; |
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protected $items = []; |
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protected $pointer = 0; |
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protected $complete = false; |
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public function __construct(Cursor $cursor) |
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{ |
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$this->cursor = $cursor; |
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} |
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public function contains($element): bool |
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{ |
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foreach ($this as $element) { |
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if ($element === $element) { |
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return true; |
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} |
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} |
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return false; |
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} |
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public function first() |
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{ |
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$this->pointer = 0; |
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if ($this->pointer < $this->length) { |
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return $this->current = $this->items[$this->pointer]; |
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} |
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return $this->current(); |
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} |
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public function last() |
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{ |
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while ($this->valid()) { |
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$this->current(); |
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$this->next(); |
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} |
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return $this->current(); |
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} |
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public function at(int $index) |
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{ |
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if ($index < $this->length) { |
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return $this->current = $this->items[$index]; |
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} |
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if ($this->complete) { |
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throw CollectionException::forOutOfBoundsIndex($index); |
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} |
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$savedPointer = $this->pointer; |
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while ($this->pointer < $index) { |
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if (!$this->valid()) { |
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break; |
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} |
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$this->next(); |
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} |
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$item = $this->current(); |
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if ($this->pointer < $index && $this->complete) { |
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$offset = $this->pointer; |
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$this->pointer = $savedPointer; |
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throw CollectionException::forOutOfBoundsIndex($offset); |
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} |
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$this->pointer = $savedPointer; |
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return $item; |
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} |
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public function current() |
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{ |
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// Empty result-set or out of bounds. |
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if ($this->cursor === null && |
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$this->current === null && |
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($this->pointer > $this->length || ($this->length === null && $this->complete)) |
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) { |
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throw CollectionException::forOutOfBoundsIndex($this->pointer); |
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} |
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if (null === $this->current) { |
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if ($this->pointer < $this->length) { |
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$this->current = $this->items[$this->pointer]; |
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} else { |
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$this->items[$this->pointer] = $this->current = $this->cursor->current(); |
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} |
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} |
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return $this->current; |
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} |
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public function next(): void |
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{ |
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$this->pointer++; |
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if ($this->pointer <= $this->length) { |
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$this->current = $this->items[$this->pointer]; |
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} elseif ($this->cursor) { |
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if ($this->pointer > $this->length) { |
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$this->length = $this->pointer; |
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} |
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$this->cursor->next(); |
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if ($this->cursor->valid()) { |
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$this->items[$this->pointer] = $this->current = $this->cursor->current(); |
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} |
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} |
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} |
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public function previous(): void |
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{ |
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if ($this->pointer > 0) { |
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$this->pointer--; |
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} |
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} |
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public function key() |
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{ |
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if (!$this->current) { |
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$this->current(); |
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} |
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return $this->pointer; |
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} |
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public function valid(): bool |
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{ |
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if ($this->pointer < $this->length) { |
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return true; |
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} |
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if ($this->cursor) { |
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$valid = $this->cursor->valid(); |
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if (!$valid) { |
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$this->complete = true; |
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$this->cursor->close(); |
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$this->cursor = null; |
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} |
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return $valid; |
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} |
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return false; |
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} |
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public function rewind(): void |
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{ |
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$this->pointer = 0; |
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$this->current = null; |
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} |
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public function count(): int |
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{ |
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if ($this->complete) { |
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return $this->length; |
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} |
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$this->last(); |
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return $this->length; |
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} |
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public function toArray(): array |
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{ |
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if ($this->complete) { |
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return $this->items; |
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} |
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$this->last(); |
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return $this->items; |
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} |
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public function toCollection(): Collection |
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{ |
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$this->last(); |
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return new Collection(new ArrayIterator($this->items)); |
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} |
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} |
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igniphp /
storage
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