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<?php |
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/** |
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* TechDivision\Import\Adapter\LeagueFilesystemAdapter |
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* |
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* NOTICE OF LICENSE |
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* |
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* This source file is subject to the Open Software License (OSL 3.0) |
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* that is available through the world-wide-web at this URL: |
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* http://opensource.org/licenses/osl-3.0.php |
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* |
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* PHP version 5 |
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* |
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* @author Tim Wagner <[email protected]> |
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* @copyright 2016 TechDivision GmbH <[email protected]> |
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* @license http://opensource.org/licenses/osl-3.0.php Open Software License (OSL 3.0) |
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* @link https://github.com/techdivision/import |
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* @link http://www.techdivision.com |
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*/ |
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namespace TechDivision\Import\Adapter; |
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use League\Flysystem\FilesystemInterface; |
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/** |
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* Adapter for the league filesystem implementation. |
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* |
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* @author Tim Wagner <[email protected]> |
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* @copyright 2016 TechDivision GmbH <[email protected]> |
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* @license http://opensource.org/licenses/osl-3.0.php Open Software License (OSL 3.0) |
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* @link https://github.com/techdivision/import |
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* @link http://www.techdivision.com |
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*/ |
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class LeagueFilesystemAdapter implements FilesystemAdapterInterface |
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{ |
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/** |
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* The league filesystem implementation. |
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* |
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* @var \League\Flysystem\FilesystemInterface |
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*/ |
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protected $filesystem; |
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/** |
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* This is a utility class, so protect it against direct |
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* instantiation. |
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* |
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* @param \League\Flysystem\FilesystemInterface $filesystem The league filesystem instance |
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*/ |
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public function __construct(FilesystemInterface $filesystem) |
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{ |
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$this->filesystem = $filesystem; |
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} |
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/** |
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* Creates a new directroy. |
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* |
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* @param string $pathname The directory path |
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* @param integer $mode The mode is 0700 by default, which means the widest possible access |
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* |
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* @return boolean TRUE on success, else FALSE |
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*/ |
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public function mkdir($pathname, $mode = 0755) |
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{ |
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return $this->filesystem->createDir($pathname, array('visibility' => $mode === 0755 ? 'public' : 'private')); |
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} |
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/** |
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* Query whether or not the passed filename exists. |
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* |
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* @param string $filename The filename to query |
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* |
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* @return boolean TRUE if the passed filename exists, else FALSE |
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*/ |
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public function isFile($filename) |
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{ |
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return $this->filesystem->has($filename); |
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} |
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/** |
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* Tells whether the filename is a directory. |
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* |
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* @param string $filename Path to the file |
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* |
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* @return TRUE if the filename exists and is a directory, else FALSE |
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*/ |
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public function isDir($filename) |
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{ |
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return $this->filesystem->has($filename); |
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} |
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/** |
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* Creates an empty file with the passed filename. |
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* |
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* @param string $filename The name of the file to create |
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* |
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* @return boolean TRUE if the file can be created, else FALSE |
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*/ |
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public function touch($filename) |
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{ |
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return $this->filesystem->put($filename, ''); |
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} |
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/** |
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* Renames a file or directory. |
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* |
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* @param string $oldname The old name |
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* @param string $newname The new name |
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* |
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* @return boolean TRUE on success, else FALSE |
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*/ |
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public function rename($oldname, $newname) |
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{ |
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return $this->filesystem->rename($oldname, $newname); |
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} |
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/** |
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* Writes the passed data to file with the passed name. |
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* |
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* @param string $filename The name of the file to write the data to |
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* @param string $data The data to write to the file |
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* |
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* @return number The number of bytes written to the file |
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*/ |
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public function write($filename, $data) |
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{ |
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return $this->filesystem->put($filename, $data); |
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} |
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/** |
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* Delete the file with the passed name. |
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* |
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* @param string $filename The name of the file to be deleted |
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* @return boolean TRUE on success, else FALSE |
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*/ |
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public function delete($filename) |
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{ |
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return $this->filesystem->delete($filename); |
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} |
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/** |
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* Copy's a file from source to destination. |
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* |
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* @param string $src The source file |
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* @param string $dest The destination file |
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* |
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* @return boolean TRUE on success, else FALSE |
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*/ |
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public function copy($src, $dest) |
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{ |
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return $this->filesystem->copy($src, $dest); |
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} |
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/** |
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* List the filenames of a directory. |
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* |
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* @param string $directory The directory to list |
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* @param boolean $recursive Whether to list recursively |
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* |
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* @return array A list of filenames |
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*/ |
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public function listContents($directory = '', $recursive = false) |
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{ |
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// initialize the array for the filenames |
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$files = array(); |
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// load the filenames of the passed directory |
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$contents = $this->filesystem->listContents($directory, $recursive); |
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// prepare the array with the file names |
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foreach ($contents as $key => $file) { |
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$files[$key] = $file['path']; |
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} |
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// return the filenames |
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return $files; |
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} |
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/** |
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* Removes the passed directory recursively. |
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* |
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* @param string $src Name of the directory to remove |
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* @param boolean $recursive TRUE if the directory has to be deleted recursive, else FALSE |
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* |
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* @return void |
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* @throws \Exception Is thrown, if the directory can not be removed |
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*/ |
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public function removeDir($src, $recursive = false) |
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{ |
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$this->filesystem->deleteDir($src); |
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} |
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/** |
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* Find and return pathnames matching a pattern |
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* |
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* @param string $pattern No tilde expansion or parameter substitution is done. |
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* @param int $flags Flags that changes the behaviour |
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* |
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* @return array Containing the matched files/directories, an empty array if no file matched or FALSE on error |
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*/ |
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public function glob(string $pattern, int $flags = 0) |
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{ |
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throw new \Exception(sprintf('Method "%s" has not yet been implemented', __METHOD__)); |
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} |
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/** |
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* Return's the size of the file with the passed name. |
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* |
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* @param string $filename The name of the file to return the size for |
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* |
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* @return int The size of the file in bytes |
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* @throws \Exception Is thrown, if the size can not be calculated |
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*/ |
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public function size($filename) |
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{ |
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return $this->filesystem->getSize($filename); |
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} |
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/** |
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* Read's and return's the content of the file with the passed name as array. |
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* |
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* @param string $filename The name of the file to return its content for |
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* |
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* @return array The content of the file as array |
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* @throws \Exception Is thrown, if the file is not accessible |
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*/ |
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public function read($filename) |
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{ |
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return $this->filesystem->read($filename); |
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} |
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} |
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If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_functionexpects aPostobject, and outputs the author of the post. The base classPostreturns a simple string and outputting a simple string will work just fine. However, the child classBlogPostwhich is a sub-type ofPostinstead decided to return anobject, and is therefore violating the SOLID principles. If aBlogPostwere passed tomy_function, PHP would not complain, but ultimately fail when executing thestrtouppercall in its body.