Verzeichnisstruktur phpBB-3.2.0
- Veröffentlicht
- 06.01.2017
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FnStream.php
001 <?php
002 namespace GuzzleHttp\Stream;
003
004 /**
005 * Compose stream implementations based on a hash of functions.
006 *
007 * Allows for easy testing and extension of a provided stream without needing
008 * to create a concrete class for a simple extension point.
009 */
010 class FnStream implements StreamInterface
011 {
012 /** @var array */
013 private $methods;
014
015 /** @var array Methods that must be implemented in the given array */
016 private static $slots = ['__toString', 'close', 'detach', 'attach',
017 'getSize', 'tell', 'eof', 'isSeekable', 'seek', 'isWritable', 'write',
018 'isReadable', 'read', 'getContents', 'getMetadata'];
019
020 /**
021 * @param array $methods Hash of method name to a callable.
022 */
023 public function __construct(array $methods)
024 {
025 $this->methods = $methods;
026
027 // Create the functions on the class
028 foreach ($methods as $name => $fn) {
029 $this->{'_fn_' . $name} = $fn;
030 }
031 }
032
033 /**
034 * Lazily determine which methods are not implemented.
035 * @throws \BadMethodCallException
036 */
037 public function __get($name)
038 {
039 throw new \BadMethodCallException(str_replace('_fn_', '', $name)
040 . '() is not implemented in the FnStream');
041 }
042
043 /**
044 * The close method is called on the underlying stream only if possible.
045 */
046 public function __destruct()
047 {
048 if (isset($this->_fn_close)) {
049 call_user_func($this->_fn_close);
050 }
051 }
052
053 /**
054 * Adds custom functionality to an underlying stream by intercepting
055 * specific method calls.
056 *
057 * @param StreamInterface $stream Stream to decorate
058 * @param array $methods Hash of method name to a closure
059 *
060 * @return FnStream
061 */
062 public static function decorate(StreamInterface $stream, array $methods)
063 {
064 // If any of the required methods were not provided, then simply
065 // proxy to the decorated stream.
066 foreach (array_diff(self::$slots, array_keys($methods)) as $diff) {
067 $methods[$diff] = [$stream, $diff];
068 }
069
070 return new self($methods);
071 }
072
073 public function __toString()
074 {
075 return call_user_func($this->_fn___toString);
076 }
077
078 public function close()
079 {
080 return call_user_func($this->_fn_close);
081 }
082
083 public function detach()
084 {
085 return call_user_func($this->_fn_detach);
086 }
087
088 public function attach($stream)
089 {
090 return call_user_func($this->_fn_attach, $stream);
091 }
092
093 public function getSize()
094 {
095 return call_user_func($this->_fn_getSize);
096 }
097
098 public function tell()
099 {
100 return call_user_func($this->_fn_tell);
101 }
102
103 public function eof()
104 {
105 return call_user_func($this->_fn_eof);
106 }
107
108 public function isSeekable()
109 {
110 return call_user_func($this->_fn_isSeekable);
111 }
112
113 public function seek($offset, $whence = SEEK_SET)
114 {
115 return call_user_func($this->_fn_seek, $offset, $whence);
116 }
117
118 public function isWritable()
119 {
120 return call_user_func($this->_fn_isWritable);
121 }
122
123 public function write($string)
124 {
125 return call_user_func($this->_fn_write, $string);
126 }
127
128 public function isReadable()
129 {
130 return call_user_func($this->_fn_isReadable);
131 }
132
133 public function read($length)
134 {
135 return call_user_func($this->_fn_read, $length);
136 }
137
138 public function getContents()
139 {
140 return call_user_func($this->_fn_getContents);
141 }
142
143 public function getMetadata($key = null)
144 {
145 return call_user_func($this->_fn_getMetadata, $key);
146 }
147 }
148