<?php

abstract class CAS_PGTStorage_AbstractStorage
{
	/**
	 * string used to store an error message. Written by
	 * PGTStorage::setErrorMessage(), read by PGTStorage::getErrorMessage().
	 *
	 * @hideinitializer
	 * @deprecated not used.
	 */
	public $_error_message = false;

	/**
	 * a boolean telling if the storage has already been initialized. Written by
	 * PGTStorage::init(), read by PGTStorage::isInitialized().
	 *
	 * @hideinitializer
	 */
	public $_initialized = false;


	/**
	 * The constructor of the class, should be called only by inherited classes.
	 *
	 * @param CAS_Client $cas_parent the CAS _client instance that creates the
	 * current object.
	 *
	 * @return void
	 *
	 * @protected
	 */
	function __construct($cas_parent)
	{
		phpCAS::traceBegin();
		if ( !$cas_parent->isProxy() ) {
		    phpCAS::error(
		        'defining PGT storage makes no sense when not using a CAS proxy'
		    );
		}
		phpCAS::traceEnd();
	}


	/**
	 * This virtual method returns an informational string giving the type of storage
	 * used by the object (used for debugging purposes).
	 *
	 * @return string
	 *
	 * @public
	 */
	function getStorageType()
	{
		phpCAS::error(__CLASS__.'::'.__FUNCTION__.'() should never be called');
	}


	/**
	 * This virtual method returns an informational string giving informations on the
	 * parameters of the storage.(used for debugging purposes).
	 *
	 * @return string
	 *
	 * @public
	 */
	function getStorageInfo()
	{
		phpCAS::error(__CLASS__.'::'.__FUNCTION__.'() should never be called');
	}


	/**
	 * This method sets en error message, which can be read later by
	 * PGTStorage::getErrorMessage().
	 *
	 * @param string $error_message an error message
	 *
	 * @return void
	 *
	 * @deprecated not used.
	 */
	function setErrorMessage($error_message)
	{
		$this->_error_message = $error_message;
	}


	/**
	 * This method returns an error message set by PGTStorage::setErrorMessage().
	 *
	 * @return string an error message when set by PGTStorage::setErrorMessage(), FALSE
	 * otherwise.
	 *
	 * @deprecated not used.
	 */
	function getErrorMessage()
	{
		return $this->_error_message;
	}


	/**
	 * This method tells if the storage has already been intialized.
	 *
	 * @return bool
	 *
	 * @protected
	 */
	function isInitialized()
	{
		return $this->_initialized;
	}


	/**
	 * This virtual method initializes the object.
	 *
	 * @return void
	 */
	function init()
	{
		$this->_initialized = true;
	}


	/**
	 * This virtual method stores a PGT and its corresponding PGT Iuo.
	 *
	 * @param string $pgt     the PGT
	 * @param string $pgt_iou the PGT iou
	 *
	 * @return void
	 *
	 * @note Should never be called.
	 */
	function write($pgt, $pgt_iou)
	{
		phpCAS::error(__CLASS__.'::'.__FUNCTION__.'() should never be called');
	}


	/**
	 * This virtual method reads a PGT corresponding to a PGT Iou and deletes
	 * the corresponding storage entry.
	 *
	 * @param string $pgt_iou the PGT iou
	 *
	 * @return string
	 *
	 * @note Should never be called.
	 */
	function read($pgt_iou)
	{
		phpCAS::error(__CLASS__.'::'.__FUNCTION__.'() should never be called');
	}
}
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