CAS/PGTStorage/pgt-file.php

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<?php

class PGTStorageFile extends PGTStorage
{
  var $_path;

  function getPath()
    {
      return $this->_path;
    }

  var $_format;

  function getFormat()
    {
      return $this->_format;
    }

  // ########################################################################
  //  DEBUGGING
  // ########################################################################
  
  function getStorageType()
    {
      return "file";
    }

  function getStorageInfo()
    {
      return 'path=`'.$this->getPath().'\', format=`'.$this->getFormat().'\'';
    }

  // ########################################################################
  //  CONSTRUCTOR
  // ########################################################################
  
  function PGTStorageFile($cas_parent,$format,$path)
    {
      phpCAS::traceBegin();
      // call the ancestor's constructor
      $this->PGTStorage($cas_parent);

      if (empty($format) ) $format = CAS_PGT_STORAGE_FILE_DEFAULT_FORMAT;
      if (empty($path) ) $path = CAS_PGT_STORAGE_FILE_DEFAULT_PATH;

      // check that the path is an absolute path
      if (getenv("OS")=="Windows_NT"){
        
         if (!preg_match('`^[a-zA-Z]:`', $path)) {
                phpCAS::error('an absolute path is needed for PGT storage to file');
        }
        
      }
      else
      {
      
        if ( $path[0] != '/' ) {
                        phpCAS::error('an absolute path is needed for PGT storage to file');
        }

        // store the path (with a leading and trailing '/')      
        $path = preg_replace('|[/]*$|','/',$path);
        $path = preg_replace('|^[/]*|','/',$path);
      }
      
      $this->_path = $path;
      // check the format and store it
      switch ($format) {
      case CAS_PGT_STORAGE_FILE_FORMAT_PLAIN:
      case CAS_PGT_STORAGE_FILE_FORMAT_XML:
        $this->_format = $format;
        break;
      default:
        phpCAS::error('unknown PGT file storage format (`'.CAS_PGT_STORAGE_FILE_FORMAT_PLAIN.'\' and `'.CAS_PGT_STORAGE_FILE_FORMAT_XML.'\' allowed)');
      }
      phpCAS::traceEnd();      
    }

  // ########################################################################
  //  INITIALIZATION
  // ########################################################################
  
  function init()
    {
      phpCAS::traceBegin();
      // if the storage has already been initialized, return immediatly
      if ( $this->isInitialized() )
        return;
      // call the ancestor's method (mark as initialized)
      parent::init();
      phpCAS::traceEnd();      
    }

  // ########################################################################
  //  PGT I/O
  // ########################################################################

  function getPGTIouFilename($pgt_iou)
    {
      phpCAS::traceBegin();
      $filename = $this->getPath().$pgt_iou.'.'.$this->getFormat();
      phpCAS::traceEnd($filename);
      return $filename;
    }
  
  function write($pgt,$pgt_iou)
    {
      phpCAS::traceBegin();
      $fname = $this->getPGTIouFilename($pgt_iou);
      if ( $f=fopen($fname,"w") ) {
        if ( fputs($f,$pgt) === FALSE ) {
          phpCAS::error('could not write PGT to `'.$fname.'\'');
        }
        fclose($f);
      } else {
        phpCAS::error('could not open `'.$fname.'\'');
      }
      phpCAS::traceEnd();      
    }

  function read($pgt_iou)
    {
      phpCAS::traceBegin();
      $pgt = FALSE;
      $fname = $this->getPGTIouFilename($pgt_iou);
      if ( !($f=fopen($fname,"r")) ) {
        phpCAS::trace('could not open `'.$fname.'\'');
      } else {
        if ( ($pgt=fgets($f)) === FALSE ) {
          phpCAS::trace('could not read PGT from `'.$fname.'\'');
        } 
        fclose($f);
      }

      // delete the PGT file
      @unlink($fname);

      phpCAS::traceEnd($pgt);
      return $pgt;
    }
  
}

  
?>

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