Total Complexity | 45 |
Total Lines | 281 |
Duplicated Lines | 0 % |
Changes | 8 | ||
Bugs | 0 | Features | 0 |
Complex classes like Stream often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Stream, and based on these observations, apply Extract Interface, too.
1 | <?php |
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24 | class Stream implements StreamInterface{ |
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25 | |||
26 | /** @var resource|null */ |
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27 | protected $stream = null; |
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28 | |||
29 | protected bool $seekable; |
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30 | protected bool $readable; |
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31 | protected bool $writable; |
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32 | protected ?string $uri = null; |
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33 | protected ?int $size = null; |
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34 | |||
35 | /** |
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36 | * Stream constructor. |
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37 | * |
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38 | * @param resource $stream |
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39 | */ |
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40 | public function __construct($stream){ |
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41 | |||
42 | if(!is_resource($stream)){ |
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43 | throw new InvalidArgumentException('Stream must be a resource'); |
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44 | } |
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45 | |||
46 | $this->stream = $stream; |
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47 | $meta = $this->getMetadata(); |
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48 | $mode = $meta['mode'] ?? null; |
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49 | $this->seekable = $meta['seekable'] ?? false; |
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50 | $this->readable = in_array($mode, FactoryHelpers::STREAM_MODES_READ); |
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51 | $this->writable = in_array($mode, FactoryHelpers::STREAM_MODES_WRITE); |
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52 | $this->uri = $meta['uri'] ?? null; |
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53 | } |
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54 | |||
55 | /** |
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56 | * Closes the stream when the destructed |
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57 | * |
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58 | * @return void |
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59 | */ |
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60 | public function __destruct(){ |
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61 | $this->close(); |
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62 | } |
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63 | |||
64 | /** |
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65 | * @inheritDoc |
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66 | */ |
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67 | public function __toString():string{ |
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68 | |||
69 | if(!is_resource($this->stream)){ |
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70 | return ''; |
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71 | } |
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72 | |||
73 | if($this->isSeekable()){ |
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74 | $this->seek(0); |
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75 | } |
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76 | |||
77 | // this would be nice but some iplementations don't like nice things :( |
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78 | # $wrapper_type = $this->getMetadata('wrapper_type'); |
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79 | # if($wrapper_type === 'plainfile'){ |
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80 | # return $this->getMetadata('uri'); |
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81 | # } |
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82 | |||
83 | return $this->getContents(); |
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84 | } |
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85 | |||
86 | /** |
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87 | * @inheritDoc |
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88 | */ |
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89 | public function close():void{ |
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90 | |||
91 | if(is_resource($this->stream)){ |
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92 | fclose($this->stream); |
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93 | } |
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94 | |||
95 | $this->detach(); |
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96 | } |
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97 | |||
98 | /** |
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99 | * @inheritDoc |
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100 | */ |
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101 | public function detach(){ |
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102 | $oldResource = $this->stream; |
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103 | |||
104 | $this->stream = null; |
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105 | $this->size = null; |
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106 | $this->uri = null; |
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107 | $this->readable = false; |
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108 | $this->writable = false; |
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109 | $this->seekable = false; |
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110 | |||
111 | return $oldResource; |
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112 | } |
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113 | |||
114 | /** |
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115 | * @inheritDoc |
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116 | */ |
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117 | public function getSize():?int{ |
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118 | |||
119 | if(!is_resource($this->stream)){ |
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120 | return null; |
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121 | } |
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122 | |||
123 | // Clear the stat cache if the stream has a URI |
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124 | if($this->uri){ |
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125 | clearstatcache(true, $this->uri); |
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126 | } |
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127 | |||
128 | $stats = fstat($this->stream); |
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129 | |||
130 | if(isset($stats['size'])){ |
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131 | $this->size = $stats['size']; |
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132 | |||
133 | return $this->size; |
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134 | } |
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135 | |||
136 | if($this->size !== null){ |
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137 | return $this->size; |
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138 | } |
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139 | |||
140 | return null; // @codeCoverageIgnore |
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141 | } |
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142 | |||
143 | /** |
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144 | * @inheritDoc |
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145 | */ |
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146 | public function tell():int{ |
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147 | |||
148 | if(!is_resource($this->stream)){ |
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149 | throw new RuntimeException('Invalid stream'); // @codeCoverageIgnore |
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150 | } |
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151 | |||
152 | $result = ftell($this->stream); |
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153 | |||
154 | if($result === false){ |
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155 | throw new RuntimeException('Unable to determine stream position'); // @codeCoverageIgnore |
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156 | } |
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157 | |||
158 | return $result; |
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159 | } |
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160 | |||
161 | /** |
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162 | * @inheritDoc |
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163 | */ |
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164 | public function eof():bool{ |
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165 | return !$this->stream || feof($this->stream); |
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166 | } |
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167 | |||
168 | /** |
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169 | * @inheritDoc |
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170 | */ |
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171 | public function isSeekable():bool{ |
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172 | return $this->seekable; |
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173 | } |
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174 | |||
175 | /** |
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176 | * @inheritDoc |
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177 | */ |
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178 | public function seek($offset, $whence = SEEK_SET):void{ |
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179 | |||
180 | if(!is_resource($this->stream)){ |
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181 | throw new RuntimeException('Invalid stream'); // @codeCoverageIgnore |
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182 | } |
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183 | |||
184 | if(!$this->seekable){ |
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185 | throw new RuntimeException('Stream is not seekable'); |
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186 | } |
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187 | elseif(fseek($this->stream, $offset, $whence) === -1){ |
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188 | throw new RuntimeException('Unable to seek to stream position '.$offset.' with whence '.$whence); |
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189 | } |
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190 | |||
191 | } |
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192 | |||
193 | /** |
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194 | * @inheritDoc |
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195 | */ |
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196 | public function rewind():void{ |
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197 | $this->seek(0); |
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198 | } |
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199 | |||
200 | /** |
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201 | * @inheritDoc |
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202 | */ |
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203 | public function isWritable():bool{ |
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204 | return $this->writable; |
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205 | } |
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206 | |||
207 | /** |
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208 | * @inheritDoc |
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209 | */ |
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210 | public function write($string):int{ |
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211 | |||
212 | if(!is_resource($this->stream)){ |
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213 | throw new RuntimeException('Invalid stream'); // @codeCoverageIgnore |
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214 | } |
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215 | |||
216 | if(!$this->writable){ |
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217 | throw new RuntimeException('Cannot write to a non-writable stream'); |
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218 | } |
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219 | |||
220 | // We can't know the size after writing anything |
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221 | $this->size = null; |
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222 | $result = fwrite($this->stream, $string); |
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223 | |||
224 | if($result === false){ |
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225 | throw new RuntimeException('Unable to write to stream'); // @codeCoverageIgnore |
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226 | } |
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227 | |||
228 | return $result; |
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229 | } |
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230 | |||
231 | /** |
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232 | * @inheritDoc |
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233 | */ |
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234 | public function isReadable():bool{ |
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235 | return $this->readable; |
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236 | } |
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237 | |||
238 | /** |
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239 | * @inheritDoc |
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240 | */ |
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241 | public function read($length):string{ |
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242 | |||
243 | if(!is_resource($this->stream)){ |
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244 | throw new RuntimeException('Invalid stream'); // @codeCoverageIgnore |
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245 | } |
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246 | |||
247 | if(!$this->readable){ |
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248 | throw new RuntimeException('Cannot read from non-readable stream'); |
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249 | } |
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250 | |||
251 | if($length < 0){ |
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252 | throw new RuntimeException('Length parameter cannot be negative'); |
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253 | } |
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254 | |||
255 | if($length === 0){ |
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256 | return ''; |
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257 | } |
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258 | |||
259 | $string = fread($this->stream, $length); |
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260 | |||
261 | if($string === false){ |
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262 | throw new RuntimeException('Unable to read from stream'); // @codeCoverageIgnore |
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263 | } |
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264 | |||
265 | return $string; |
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266 | } |
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267 | |||
268 | /** |
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269 | * @inheritDoc |
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270 | */ |
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271 | public function getContents():string{ |
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272 | |||
273 | if(!is_resource($this->stream)){ |
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274 | throw new RuntimeException('Invalid stream'); // @codeCoverageIgnore |
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275 | } |
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276 | |||
277 | if(!$this->readable){ |
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278 | throw new RuntimeException('Cannot read from non-readable stream'); |
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279 | } |
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280 | |||
281 | $contents = stream_get_contents($this->stream); |
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282 | |||
283 | if($contents === false){ |
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284 | throw new RuntimeException('Unable to read stream contents'); // @codeCoverageIgnore |
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285 | } |
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286 | |||
287 | return $contents; |
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288 | } |
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289 | |||
290 | /** |
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291 | * @inheritDoc |
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292 | */ |
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293 | public function getMetadata($key = null):mixed{ |
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305 | } |
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306 | |||
307 | } |
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308 |