Current File : //www/varak.net/wiki.varak.net/vendor/wikimedia/cdb/src/Reader.php
<?php
namespace Cdb;
/**
* Native CDB file reader and writer.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
/**
* Read from a CDB file.
* Native and pure PHP implementations are provided.
* http://cr.yp.to/cdb.html
*/
abstract class Reader {
/**
* The file handle
*/
protected $handle;
/**
* Open a file and return a subclass instance
*
* @param string $fileName
*
* @return Reader
*/
public static function open( $fileName ) {
return self::haveExtension() ?
new Reader\DBA( $fileName ) :
new Reader\PHP( $fileName );
}
/**
* Returns true if the native extension is available
*
* @return bool
*/
public static function haveExtension() {
if ( !function_exists( 'dba_handlers' ) ) {
return false;
}
$handlers = dba_handlers();
if ( !in_array( 'cdb', $handlers ) || !in_array( 'cdb_make', $handlers ) ) {
return false;
}
return true;
}
/**
* Create the object and open the file
*
* @param string $fileName
*/
abstract public function __construct( $fileName );
/**
* Close the file. Optional, you can just let the variable go out of scope.
*/
abstract public function close();
/**
* Get a value with a given key. Only string values are supported.
*
* @param string $key
*/
abstract public function get( $key );
/**
* Check whether key exists
*
* @param string $key
*/
abstract public function exists( $key );
/**
* Fetch first key
*/
abstract public function firstkey();
/**
* Fetch next key
*/
abstract public function nextkey();
}
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