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<?php |
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/* |
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* This file is part of the kaloa/xmp package. |
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* |
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* For full copyright and license information, please view the LICENSE file |
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* that was distributed with this source code. |
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*/ |
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namespace Kaloa\Xmp\Properties; |
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use DateTime; |
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use DOMNode; |
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/** |
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* Extracts the Exif properties from an XMP document referenced by an XPath |
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* instance. |
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* |
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* The descriptions for all getters are taken from |
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* <a href="http://www.exiv2.org/tags-xmp-exif.html">exiv2.org</a>. |
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* |
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* @todo More EXIF properties will be added in later versions. |
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*/ |
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class ExifProperties extends AbstractProperties |
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{ |
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/** |
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* See getDateTimeOriginal. |
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* |
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* @var DateTime|null |
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*/ |
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private $dateTimeOriginal = null; |
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/** |
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* See getExifVersion. |
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* |
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* @var string |
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*/ |
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private $exifVersion = ''; |
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/** |
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* See getPixelXDimension. |
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* |
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* @var string |
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*/ |
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private $pixelXDimension = ''; |
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/** |
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* See getPixelYDimension. |
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* |
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* @var string |
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*/ |
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private $pixelYDimension = ''; |
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/** |
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* Tries to fill an entity instance variable with corresponding data from |
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* the XMP document. |
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* |
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* Exif data might be added either as attributes or as independent elements. |
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* This method checks for both. If both types are found, element content |
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* will overwrite attribute content. |
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* |
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* @param string $entity |
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*/ |
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private function fill($entity) |
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{ |
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$value = ''; |
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$whatLcfirst = lcfirst($entity); |
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foreach ($this->xPath->query('//rdf:Description') as $node) { |
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/* @var $node DOMNode */ |
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if ($node->hasAttributes()) { |
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$attribute = $node->attributes->getNamedItemNS( |
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'http://ns.adobe.com/exif/1.0/', |
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$entity |
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); |
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if ($attribute !== null) { |
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$value = $attribute->nodeValue; |
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} |
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} |
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} |
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if ($value === '') { |
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foreach ($this->xPath->query('//exif:' . $entity) as $node) { |
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$value = $node->nodeValue; |
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} |
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} |
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$this->{$whatLcfirst} = $value; |
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} |
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/** |
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* Retrieves all properties from the underlying XMP document. |
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*/ |
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final protected function init() |
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{ |
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$this->fill('DateTimeOriginal'); |
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if (trim($this->dateTimeOriginal) !== '') { |
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$this->dateTimeOriginal = DateTime::createFromFormat( |
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'Y-m-d\TH:i:s.uP', |
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$this->dateTimeOriginal |
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); |
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} else { |
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$this->dateTimeOriginal = null; |
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} |
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$this->fill('ExifVersion'); |
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$this->fill('PixelXDimension'); |
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$this->fill('PixelYDimension'); |
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// Free our reference to the XPath instance. |
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$this->xPath = null; |
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} |
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/** |
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* Returns date and time when original image was generated, in ISO 8601 |
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* format. |
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* |
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* @return DateTime|null |
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*/ |
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public function getDateTimeOriginal() |
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{ |
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return $this->dateTimeOriginal; |
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} |
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/** |
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* Returns the EXIF version number. |
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* |
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* @return string |
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*/ |
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public function getExifVersion() |
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{ |
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return $this->exifVersion; |
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} |
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/** |
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* Return the image width, in pixels. |
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* |
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* @return string |
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*/ |
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1 |
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public function getPixelXDimension() |
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{ |
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return $this->pixelXDimension; |
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} |
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/** |
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* Returns the image height, in pixels. |
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* |
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* @return string |
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*/ |
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1 |
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public function getPixelYDimension() |
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{ |
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return $this->pixelYDimension; |
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} |
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} |
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mermshaus /
kaloa-xmp
