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- 06.01.2017
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StreamDecoratorTrait.php
001 <?php
002 namespace GuzzleHttp\Stream;
003 use GuzzleHttp\Stream\Exception\CannotAttachException;
004
005 /**
006 * Stream decorator trait
007 * @property StreamInterface stream
008 */
009 trait StreamDecoratorTrait
010 {
011 /**
012 * @param StreamInterface $stream Stream to decorate
013 */
014 public function __construct(StreamInterface $stream)
015 {
016 $this->stream = $stream;
017 }
018
019 /**
020 * Magic method used to create a new stream if streams are not added in
021 * the constructor of a decorator (e.g., LazyOpenStream).
022 */
023 public function __get($name)
024 {
025 if ($name == 'stream') {
026 $this->stream = $this->createStream();
027 return $this->stream;
028 }
029
030 throw new \UnexpectedValueException("$name not found on class");
031 }
032
033 public function __toString()
034 {
035 try {
036 $this->seek(0);
037 return $this->getContents();
038 } catch (\Exception $e) {
039 // Really, PHP? https://bugs.php.net/bug.php?id=53648
040 trigger_error('StreamDecorator::__toString exception: '
041 . (string) $e, E_USER_ERROR);
042 return '';
043 }
044 }
045
046 public function getContents()
047 {
048 return Utils::copyToString($this);
049 }
050
051 /**
052 * Allow decorators to implement custom methods
053 *
054 * @param string $method Missing method name
055 * @param array $args Method arguments
056 *
057 * @return mixed
058 */
059 public function __call($method, array $args)
060 {
061 $result = call_user_func_array(array($this->stream, $method), $args);
062
063 // Always return the wrapped object if the result is a return $this
064 return $result === $this->stream ? $this : $result;
065 }
066
067 public function close()
068 {
069 $this->stream->close();
070 }
071
072 public function getMetadata($key = null)
073 {
074 return $this->stream->getMetadata($key);
075 }
076
077 public function detach()
078 {
079 return $this->stream->detach();
080 }
081
082 public function attach($stream)
083 {
084 throw new CannotAttachException();
085 }
086
087 public function getSize()
088 {
089 return $this->stream->getSize();
090 }
091
092 public function eof()
093 {
094 return $this->stream->eof();
095 }
096
097 public function tell()
098 {
099 return $this->stream->tell();
100 }
101
102 public function isReadable()
103 {
104 return $this->stream->isReadable();
105 }
106
107 public function isWritable()
108 {
109 return $this->stream->isWritable();
110 }
111
112 public function isSeekable()
113 {
114 return $this->stream->isSeekable();
115 }
116
117 public function seek($offset, $whence = SEEK_SET)
118 {
119 return $this->stream->seek($offset, $whence);
120 }
121
122 public function read($length)
123 {
124 return $this->stream->read($length);
125 }
126
127 public function write($string)
128 {
129 return $this->stream->write($string);
130 }
131
132 /**
133 * Implement in subclasses to dynamically create streams when requested.
134 *
135 * @return StreamInterface
136 * @throws \BadMethodCallException
137 */
138 protected function createStream()
139 {
140 throw new \BadMethodCallException('createStream() not implemented in '
141 . get_class($this));
142 }
143 }
144