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<?php
namespace Box\Spout\Writer\Common\Manager\Style;
use Box\Spout\Common\Entity\Style\Style;
/**
* Class StyleRegistry
* Registry for all used styles
*/
class StyleRegistry
{
/** @var array [SERIALIZED_STYLE] => [STYLE_ID] mapping table, keeping track of the registered styles */
protected $serializedStyleToStyleIdMappingTable = [];
/** @var array [STYLE_ID] => [STYLE] mapping table, keeping track of the registered styles */
protected $styleIdToStyleMappingTable = [];
/**
* @param Style $defaultStyle
*/
public function __construct(Style $defaultStyle)
{
// This ensures that the default style is the first one to be registered
$this->registerStyle($defaultStyle);
}
/**
* Registers the given style as a used style.
* Duplicate styles won't be registered more than once.
*
* @param Style $style The style to be registered
* @return Style The registered style, updated with an internal ID.
*/
public function registerStyle(Style $style)
{
$serializedStyle = $this->serialize($style);
if (!$this->hasStyleAlreadyBeenRegistered($style)) {
$nextStyleId = count($this->serializedStyleToStyleIdMappingTable);
$style->setId($nextStyleId);
$this->serializedStyleToStyleIdMappingTable[$serializedStyle] = $nextStyleId;
$this->styleIdToStyleMappingTable[$nextStyleId] = $style;
}
return $this->getStyleFromSerializedStyle($serializedStyle);
}
/**
* Returns whether the given style has already been registered.
*
* @param Style $style
* @return bool
*/
protected function hasStyleAlreadyBeenRegistered(Style $style)
{
$serializedStyle = $this->serialize($style);
// Using isset here because it is way faster than array_key_exists...
return isset($this->serializedStyleToStyleIdMappingTable[$serializedStyle]);
}
/**
* Returns the registered style associated to the given serialization.
*
* @param string $serializedStyle The serialized style from which the actual style should be fetched from
* @return Style
*/
protected function getStyleFromSerializedStyle($serializedStyle)
{
$styleId = $this->serializedStyleToStyleIdMappingTable[$serializedStyle];
return $this->styleIdToStyleMappingTable[$styleId];
}
/**
* @return Style[] List of registered styles
*/
public function getRegisteredStyles()
{
return array_values($this->styleIdToStyleMappingTable);
}
/**
* @param int $styleId
* @return Style
*/
public function getStyleFromStyleId($styleId)
{
return $this->styleIdToStyleMappingTable[$styleId];
}
/**
* Serializes the style for future comparison with other styles.
* The ID is excluded from the comparison, as we only care about
* actual style properties.
*
* @param Style $style
* @return string The serialized style
*/
public function serialize(Style $style)
{
// In order to be able to properly compare style, set static ID value
$currentId = $style->getId();
$style->setId(0);
$serializedStyle = serialize($style);
$style->setId($currentId);
return $serializedStyle;
}
}