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StreamDecoratorTrait.php
001 <?php
002
003 namespace GuzzleHttp\Psr7;
004
005 use Psr\Http\Message\StreamInterface;
006
007 /**
008 * Stream decorator trait
009 *
010 * @property StreamInterface stream
011 */
012 trait StreamDecoratorTrait
013 {
014 /**
015 * @param StreamInterface $stream Stream to decorate
016 */
017 public function __construct(StreamInterface $stream)
018 {
019 $this->stream = $stream;
020 }
021
022 /**
023 * Magic method used to create a new stream if streams are not added in
024 * the constructor of a decorator (e.g., LazyOpenStream).
025 *
026 * @param string $name Name of the property (allows "stream" only).
027 *
028 * @return StreamInterface
029 */
030 public function __get($name)
031 {
032 if ($name == 'stream') {
033 $this->stream = $this->createStream();
034 return $this->stream;
035 }
036
037 throw new \UnexpectedValueException("$name not found on class");
038 }
039
040 public function __toString()
041 {
042 try {
043 if ($this->isSeekable()) {
044 $this->seek(0);
045 }
046 return $this->getContents();
047 } catch (\Exception $e) {
048 // Really, PHP? https://bugs.php.net/bug.php?id=53648
049 trigger_error('StreamDecorator::__toString exception: '
050 . (string) $e, E_USER_ERROR);
051 return '';
052 }
053 }
054
055 public function getContents()
056 {
057 return Utils::copyToString($this);
058 }
059
060 /**
061 * Allow decorators to implement custom methods
062 *
063 * @param string $method Missing method name
064 * @param array $args Method arguments
065 *
066 * @return mixed
067 */
068 public function __call($method, array $args)
069 {
070 $result = call_user_func_array([$this->stream, $method], $args);
071
072 // Always return the wrapped object if the result is a return $this
073 return $result === $this->stream ? $this : $result;
074 }
075
076 public function close()
077 {
078 $this->stream->close();
079 }
080
081 public function getMetadata($key = null)
082 {
083 return $this->stream->getMetadata($key);
084 }
085
086 public function detach()
087 {
088 return $this->stream->detach();
089 }
090
091 public function getSize()
092 {
093 return $this->stream->getSize();
094 }
095
096 public function eof()
097 {
098 return $this->stream->eof();
099 }
100
101 public function tell()
102 {
103 return $this->stream->tell();
104 }
105
106 public function isReadable()
107 {
108 return $this->stream->isReadable();
109 }
110
111 public function isWritable()
112 {
113 return $this->stream->isWritable();
114 }
115
116 public function isSeekable()
117 {
118 return $this->stream->isSeekable();
119 }
120
121 public function rewind()
122 {
123 $this->seek(0);
124 }
125
126 public function seek($offset, $whence = SEEK_SET)
127 {
128 $this->stream->seek($offset, $whence);
129 }
130
131 public function read($length)
132 {
133 return $this->stream->read($length);
134 }
135
136 public function write($string)
137 {
138 return $this->stream->write($string);
139 }
140
141 /**
142 * Implement in subclasses to dynamically create streams when requested.
143 *
144 * @return StreamInterface
145 *
146 * @throws \BadMethodCallException
147 */
148 protected function createStream()
149 {
150 throw new \BadMethodCallException('Not implemented');
151 }
152 }
153