class pCache in Visitors 8

Hierarchy

• class \pCache

File

pchart/pCache.inc, line 35

class pCache {
  var $HashKey = "";
  var $CacheFolder = "Cache/";

  /* Create the pCache object */
  function pCache($CacheFolder = "Cache/") {
    $this->CacheFolder = $CacheFolder;
  }

  /* This function is clearing the cache folder */
  function ClearCache() {
    if ($handle = opendir($this->CacheFolder)) {
      while (false !== ($file = readdir($handle))) {
        if ($file != "." && $file != "..") {
          unlink($this->CacheFolder . $file);
        }
      }
      closedir($handle);
    }
  }

  /* This function is checking if we have an offline version of this chart */
  function IsInCache($ID, $Data, $Hash = "") {
    if ($Hash == "") {
      $Hash = $this
        ->GetHash($ID, $Data);
    }
    if (file_exists($this->CacheFolder . $Hash)) {
      return TRUE;
    }
    else {
      return FALSE;
    }
  }

  /* This function is making a copy of drawn chart in the cache folder */
  function WriteToCache($ID, $Data, $Picture) {
    $Hash = $this
      ->GetHash($ID, $Data);
    $FileName = $this->CacheFolder . $Hash;
    imagepng($Picture->Picture, $FileName);
  }

  /* This function is removing any cached copy of this chart */
  function DeleteFromCache($ID, $Data) {
    $Hash = $this
      ->GetHash($ID, $Data);
    $FileName = $this->CacheFolder . $Hash;
    if (file_exists($FileName)) {
      unlink($FileName);
    }
  }

  /* This function is retrieving the cached picture if applicable */
  function GetFromCache($ID, $Data) {
    $Hash = $this
      ->GetHash($ID, $Data);
    if ($this
      ->IsInCache("", "", $Hash)) {
      $FileName = $this->CacheFolder . $Hash;
      header('Content-type: image/png');
      @readfile($FileName);
      exit;
    }
  }

  /* This function is building the graph unique hash key */
  function GetHash($ID, $Data) {
    $mKey = "{$ID}";
    foreach ($Data as $key => $Values) {
      $tKey = "";
      foreach ($Values as $Serie => $Value) {
        $tKey = $tKey . $Serie . $Value;
      }
      $mKey = $mKey . md5($tKey);
    }
    return md5($mKey);
  }

}

Members

Name	Modifiers	Type	Description	Overrides
pCache::$CacheFolder		property
pCache::$HashKey		property
pCache::ClearCache		function
pCache::DeleteFromCache		function
pCache::GetFromCache		function
pCache::GetHash		function
pCache::IsInCache		function
pCache::pCache		function
pCache::WriteToCache		function