Pro PHP- Patterns, Frameworks, Testing and More

CHAPTER 3 ■ SINGLETON AND FACTORY PATTERNS^25

class Image_PNG implements IImage {

private $_width, $_height, $_data;

public function __construct($file) {

$this->_file = $file;

$this->_parse();

}

private function _parse() {

//Complete PNG specific parsing

//and populate $_width, $_height and $_data

}

public function getWidth() {

return $this->_width;

}

public function getHeight() {

return $this->_height;

}

public function getData() {

return $this->_data;

}

}

class Image_JPEG implements IImage {

private $_width, $_height, $_data;

public function __construct($file) {

$this->_file = $file;

$this->_parse();

}

private function _parse() {

//Complete JPEG specific parsing

//and populate $_width, $_height and $_data

}

public function getWidth() {

return $this->_width;

}

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