Container.php

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<?php

namespace Rsi\Fred\Storage;

abstract class Container extends \Rsi\Thing{

  protected $_storage = null;
  protected $_key = null;

  protected $_data = null;
  protected $_changed = false;

  public function __construct($storage,$options,$key){
    $this->_storage = $storage;
    $this->configure($options);
    $this->_key = $key;
  }

  public function __destruct(){
    $this->commit();
  }

  abstract protected function open();

  abstract protected function save();

  public function read($key,$default = null){
    return \Rsi\Record::get($this->data,$key,$default);
  }

  public function write($key,$value){
    if($value !== $this->read($key)){
      \Rsi\Record::set($this->_data,$key,$value);
      $this->_changed = true;
    }
  }

  public function remove($key){
    if(\Rsi\Record::exists($this->data,$key)){
      \Rsi\Record::delete($this->_data,$key);
      $this->_changed = true;
    }
  }

  public function clear(){
    $this->_data = null;
    $this->_changed = true;
  }

  public function commit(){
    if($this->_changed) $this->save();
    $this->_changed = false;
  }

  public function rollback(){
    $this->_data = null;
    $this->_changed = false;
  }

  protected function _get($key){
    return $this->read($key);
  }

  protected function _set($key,$value){
    $this->write($key,$value);
  }

  protected function getData(){
    if($this->_data === null) $this->open();
    return $this->_data;
  }

}