<?php

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namespace GuzzleHttp\Psr7;

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use Psr\Http\Message\StreamInterface;

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/**

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* Compose stream implementations based on a hash of functions.

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*

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* Allows for easy testing and extension of a provided stream without needing

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* to create a concrete class for a simple extension point.

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*

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* @final

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*/

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class FnStream implements StreamInterface

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{

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/** @var array */

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private $methods;

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/** @var array Methods that must be implemented in the given array */

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private static $slots = ['__toString', 'close', 'detach', 'rewind',

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'getSize', 'tell', 'eof', 'isSeekable', 'seek', 'isWritable', 'write',

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'isReadable', 'read', 'getContents', 'getMetadata'];

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/**

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* @param array $methods Hash of method name to a callable.

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*/

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public function __construct(array $methods)

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{

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$this->methods = $methods;

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// Create the functions on the class

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foreach ($methods as $name => $fn) {

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$this->{'_fn_' . $name} = $fn;

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}

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}

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/**

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* Lazily determine which methods are not implemented.

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*

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* @throws \BadMethodCallException

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*/

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public function __get($name)

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{

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throw new \BadMethodCallException(str_replace('_fn_', '', $name)

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. '() is not implemented in the FnStream');

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}

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/**

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* The close method is called on the underlying stream only if possible.

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*/

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public function __destruct()

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{

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if (isset($this->_fn_close)) {

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call_user_func($this->_fn_close);

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}

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}

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/**

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* An unserialize would allow the __destruct to run when the unserialized value goes out of scope.

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*

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* @throws \LogicException

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*/

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public function __wakeup()

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{

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throw new \LogicException('FnStream should never be unserialized');

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}

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/**

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* Adds custom functionality to an underlying stream by intercepting

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* specific method calls.

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*

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* @param StreamInterface $stream Stream to decorate

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* @param array $methods Hash of method name to a closure

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*

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* @return FnStream

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*/

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public static function decorate(StreamInterface $stream, array $methods)

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{

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// If any of the required methods were not provided, then simply

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// proxy to the decorated stream.

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foreach (array_diff(self::$slots, array_keys($methods)) as $diff) {

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$methods[$diff] = [$stream, $diff];

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}

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return new self($methods);

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}

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public function __toString()

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{

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return call_user_func($this->_fn___toString);

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}

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public function close()

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{

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return call_user_func($this->_fn_close);

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}

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public function detach()

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{

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return call_user_func($this->_fn_detach);

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}

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public function getSize()

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{

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return call_user_func($this->_fn_getSize);

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}

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public function tell()

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{

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return call_user_func($this->_fn_tell);

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}

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public function eof()

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{

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return call_user_func($this->_fn_eof);

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}

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public function isSeekable()

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{

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return call_user_func($this->_fn_isSeekable);

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}

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public function rewind()

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{

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call_user_func($this->_fn_rewind);

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}

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public function seek($offset, $whence = SEEK_SET)

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{

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call_user_func($this->_fn_seek, $offset, $whence);

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}

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public function isWritable()

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{

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return call_user_func($this->_fn_isWritable);

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}

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public function write($string)

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{

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return call_user_func($this->_fn_write, $string);

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}

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public function isReadable()

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{

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return call_user_func($this->_fn_isReadable);

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}

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public function read($length)

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{

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return call_user_func($this->_fn_read, $length);

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}

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public function getContents()

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{

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return call_user_func($this->_fn_getContents);

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}

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public function getMetadata($key = null)

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{

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return call_user_func($this->_fn_getMetadata, $key);

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}

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}

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