Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like Swift_Transport_StreamBuffer 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. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
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 Swift_Transport_StreamBuffer, and based on these observations, apply Extract Interface, too.
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16 | class Swift_Transport_StreamBuffer extends Swift_ByteStream_AbstractFilterableInputStream implements Swift_Transport_IoBuffer |
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17 | { |
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18 | /** |
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19 | * A primary socket |
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20 | * |
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21 | * @var resource |
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22 | */ |
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23 | private $_stream; |
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24 | |||
25 | /** |
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26 | * The input stream |
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27 | */ |
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28 | private $_in; |
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29 | |||
30 | /** |
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31 | * The output stream |
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32 | */ |
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33 | private $_out; |
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34 | |||
35 | /** |
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36 | * Buffer initialization parameters |
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37 | */ |
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38 | private $_params = array(); |
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39 | |||
40 | /** |
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41 | * The ReplacementFilterFactory |
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42 | * |
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43 | * @var Swift_ReplacementFilterFactory |
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44 | */ |
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45 | private $_replacementFactory; |
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46 | |||
47 | /** |
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48 | * Translations performed on data being streamed into the buffer |
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49 | * |
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50 | * @var array |
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51 | */ |
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52 | private $_translations = array(); |
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53 | |||
54 | /** |
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55 | * Create a new StreamBuffer using $replacementFactory for transformations. |
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56 | * |
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57 | * @param Swift_ReplacementFilterFactory $replacementFactory |
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58 | */ |
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59 | 8 | public function __construct(Swift_ReplacementFilterFactory $replacementFactory) |
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63 | |||
64 | /** |
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65 | * Perform any initialization needed, using the given $params. |
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66 | * |
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67 | * Parameters will vary depending upon the type of IoBuffer used. |
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68 | * |
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69 | * @param array $params |
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70 | */ |
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71 | 5 | public function initialize(array $params) |
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84 | |||
85 | /** |
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86 | * Set an individual param on the buffer (e.g. switching to SSL). |
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87 | * |
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88 | * @param string $param |
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89 | * @param integer $value |
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90 | */ |
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91 | public function setParam($param, $value) |
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110 | |||
111 | public function startTLS() |
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115 | |||
116 | /** |
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117 | * Perform any shutdown logic needed. |
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118 | */ |
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119 | 4 | public function terminate() |
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138 | |||
139 | /** |
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140 | * Set an array of string replacements which should be made on data written |
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141 | * to the buffer. |
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142 | * |
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143 | * This could replace LF with CRLF for example. |
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144 | * |
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145 | * @param string[] $replacements |
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146 | */ |
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147 | 6 | public function setWriteTranslations(array $replacements) |
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148 | { |
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149 | 6 | foreach ($this->_translations as $search => $replace) { |
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150 | 5 | if (!isset($replacements[$search])) { |
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151 | 4 | $this->removeFilter($search); |
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152 | 4 | unset($this->_translations[$search]); |
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153 | 4 | } |
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154 | 6 | } |
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155 | |||
156 | 6 | foreach ($replacements as $search => $replace) { |
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157 | 6 | if (!isset($this->_translations[$search])) { |
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158 | 6 | $this->addFilter( |
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159 | 6 | $this->_replacementFactory->createFilter($search, $replace), |
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160 | $search |
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161 | 6 | ); |
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162 | 6 | $this->_translations[$search] = true; |
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163 | 6 | } |
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164 | 6 | } |
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165 | 6 | } |
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166 | |||
167 | /** |
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168 | * Get a line of output (including any CRLF). |
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169 | * |
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170 | * The $sequence number comes from any writes and may or may not be used |
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171 | * depending upon the implementation. |
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172 | * |
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173 | * @param int $sequence of last write to scan from |
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174 | * |
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175 | * @throws Swift_IoException |
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176 | * |
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177 | * @return string |
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178 | */ |
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179 | 5 | View Code Duplication | public function readLine($sequence) |
193 | |||
194 | /** |
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195 | * Reads $length bytes from the stream into a string and moves the pointer |
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196 | * through the stream by $length. |
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197 | * |
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198 | * If less bytes exist than are requested the remaining bytes are given instead. |
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199 | * If no bytes are remaining at all, boolean false is returned. |
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200 | * |
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201 | * @param int $length |
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202 | * |
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203 | * @throws Swift_IoException |
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204 | * |
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205 | * @return string|null |
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206 | */ |
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207 | View Code Duplication | public function read($length) |
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208 | { |
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209 | if (isset($this->_out) && !feof($this->_out)) { |
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210 | $ret = fread($this->_out, $length); |
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211 | if (!$ret) { |
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212 | $metas = stream_get_meta_data($this->_out); |
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213 | if ($metas['timed_out']) { |
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214 | throw new Swift_IoException( |
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215 | 'Connection to ' . $this->_getReadConnectionDescription() . ' Timed Out' |
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216 | ); |
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217 | } |
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218 | } |
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219 | |||
220 | return $ret; |
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221 | } |
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222 | } |
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223 | |||
224 | /** Not implemented */ |
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225 | public function setReadPointer($byteOffset) |
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228 | |||
229 | /** Flush the stream contents */ |
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230 | 4 | protected function _flush() |
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236 | |||
237 | /** |
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238 | * Write this bytes to the stream |
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239 | * |
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240 | * @param string $bytes |
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241 | * |
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242 | * @return int |
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243 | * |
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244 | * @throws Swift_IoException |
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245 | */ |
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246 | 4 | protected function _commit($bytes) |
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268 | |||
269 | /** |
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270 | * Establishes a connection to a remote server. |
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271 | * |
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272 | * @throws Swift_TransportException |
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273 | */ |
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274 | 5 | private function _establishSocketConnection() |
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320 | |||
321 | /** |
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322 | * Opens a process for input/output. |
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323 | */ |
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324 | private function _establishProcessConnection() |
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345 | |||
346 | 1 | private function _getReadConnectionDescription() |
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365 | } |
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366 |
You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.