<?php

/*
 +--------------------------------------------------------------------+
 | CiviCRM version 3.0                                                |
 +--------------------------------------------------------------------+
 | Copyright CiviCRM LLC (c) 2004-2009                                |
 +--------------------------------------------------------------------+
 | This file is a part of CiviCRM.                                    |
 |                                                                    |
 | CiviCRM is free software; you can copy, modify, and distribute it  |
 | under the terms of the GNU Affero General Public License           |
 | Version 3, 19 November 2007.                                       |
 |                                                                    |
 | CiviCRM is distributed in the hope that it will be useful, but     |
 | WITHOUT ANY WARRANTY; without even the implied warranty of         |
 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.               |
 | See the GNU Affero General Public License for more details.        |
 |                                                                    |
 | You should have received a copy of the GNU Affero General Public   |
 | License along with this program; if not, contact CiviCRM LLC       |
 | at info[AT]civicrm[DOT]org. If you have questions about the        |
 | GNU Affero General Public License or the licensing of CiviCRM,     |
 | see the CiviCRM license FAQ at http://civicrm.org/licensing        |
 +--------------------------------------------------------------------+
*/

/**
 *
 * @package CRM
 * @copyright CiviCRM LLC (c) 2004-2009
 * $Id$
 *
 */

require_once 'CRM/ACL/DAO/Cache.php';

/**
 *  Access Control Cache
 */
class CRM_ACL_BAO_Cache extends CRM_ACL_DAO_Cache {

    static $_cache = null;

    static function &build( $id ) {
        if ( ! self::$_cache ) {
            self::$_cache = array( );
        }
        
        if ( array_key_exists( $id, self::$_cache ) ) {
            return self::$_cache[$id];
        }

        // check if this entry exists in db
        // if so retrieve and return
        self::$_cache[$id] = self::retrieve( $id );
        if ( self::$_cache[$id] ) {
            return self::$_cache[$id];
        }

        require_once 'CRM/ACL/BAO/ACL.php';
        self::$_cache[$id] = CRM_ACL_BAO_ACL::getAllByContact( $id );
        self::store( $id, self::$_cache[$id] );
        return self::$_cache[$id];
    }

    static function retrieve( $id ) {
        $query = "
SELECT acl_id
  FROM civicrm_acl_cache
 WHERE contact_id = %1
";
        $params = array( 1 => array( $id, 'Integer' ) );

        if ( $id == 0 ) {
            $query .= " OR contact_id IS NULL";
        }

        $dao =& CRM_Core_DAO::executeQuery( $query, $params );

        $cache = array( );
        while ( $dao->fetch( ) ) {
            $cache[$dao->acl_id] = 1;
        }
        return $cache;
    }

    static function store( $id, &$cache ) {
        foreach ( $cache as $aclID => $data ) {
            $dao =& new CRM_ACL_DAO_Cache( );
            if ( $id ) {
                $dao->contact_id = $id;
            }
            $dao->acl_id     = $aclID;

            $cache[$aclID] = 1;

            $dao->save( );
        }
    }

    static function deleteEntry( $id ) {
        if ( self::$_cache &&
             array_key_exists( $id, self::$_cache ) ) {
            unset( self::$_cache[$id] );
        }

        $query = "
DELETE FROM civicrm_acl_cache
WHERE contact_id = %1
";
        $params = array( 1 => array( $id, 'Integer' ) );
        $dao =& CRM_Core_DAO::executeQuery( $query, $params );
    }

    static function updateEntry( $id ) {
        self::delete( $id );
        self::build( $id );
    }

    // deletes all the cache entries
    static function resetCache( ) {
        self::$_cache = null;

        $query = "
DELETE     c 
FROM       civicrm_acl_cache c
INNER JOIN civicrm_acl       a ON c.acl_id = a.id
";

        $dao =& CRM_Core_DAO::executeQuery( $query );
    }

}


