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<?php
/**
* 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
* @ingroup Database
*/
namespace Wikimedia\Rdbms;
use InvalidArgumentException;
/**
* Class to handle database/prefix specification for IDatabase domains
*/
class DatabaseDomain {
/** @var string|null */
private $database;
/** @var string|null */
private $schema;
/** @var string */
private $prefix;
/** @var string Cache of convertToString() */
private $equivalentString;
/**
* @param string|null $database Database name
* @param string|null $schema Schema name
* @param string $prefix Table prefix
*/
public function __construct( $database, $schema, $prefix ) {
if ( $database !== null && ( !is_string( $database ) || !strlen( $database ) ) ) {
throw new InvalidArgumentException( "Database must be null or a non-empty string." );
}
$this->database = $database;
if ( $schema !== null && ( !is_string( $schema ) || !strlen( $schema ) ) ) {
throw new InvalidArgumentException( "Schema must be null or a non-empty string." );
}
$this->schema = $schema;
if ( !is_string( $prefix ) ) {
throw new InvalidArgumentException( "Prefix must be a string." );
}
$this->prefix = $prefix;
}
/**
* @param DatabaseDomain|string $domain Result of DatabaseDomain::toString()
* @return DatabaseDomain
*/
public static function newFromId( $domain ) {
if ( $domain instanceof self ) {
return $domain;
}
$parts = array_map( [ __CLASS__, 'decode' ], explode( '-', $domain ) );
$schema = null;
$prefix = '';
if ( count( $parts ) == 1 ) {
$database = $parts[0];
} elseif ( count( $parts ) == 2 ) {
list( $database, $prefix ) = $parts;
} elseif ( count( $parts ) == 3 ) {
list( $database, $schema, $prefix ) = $parts;
} else {
throw new InvalidArgumentException( "Domain has too few or too many parts." );
}
if ( $database === '' ) {
$database = null;
}
return new self( $database, $schema, $prefix );
}
/**
* @return DatabaseDomain
*/
public static function newUnspecified() {
return new self( null, null, '' );
}
/**
* @param DatabaseDomain|string $other
* @return bool
*/
public function equals( $other ) {
if ( $other instanceof DatabaseDomain ) {
return (
$this->database === $other->database &&
$this->schema === $other->schema &&
$this->prefix === $other->prefix
);
}
return ( $this->getId() === $other );
}
/**
* @return string|null Database name
*/
public function getDatabase() {
return $this->database;
}
/**
* @return string|null Database schema
*/
public function getSchema() {
return $this->schema;
}
/**
* @return string Table prefix
*/
public function getTablePrefix() {
return $this->prefix;
}
/**
* @return string
*/
public function getId() {
if ( $this->equivalentString === null ) {
$this->equivalentString = $this->convertToString();
}
return $this->equivalentString;
}
/**
* @return string
*/
private function convertToString() {
$parts = [ $this->database ];
if ( $this->schema !== null ) {
$parts[] = $this->schema;
}
if ( $this->prefix != '' ) {
$parts[] = $this->prefix;
}
return implode( '-', array_map( [ __CLASS__, 'encode' ], $parts ) );
}
private static function encode( $decoded ) {
$encoded = '';
$length = strlen( $decoded );
for ( $i = 0; $i < $length; ++$i ) {
$char = $decoded[$i];
if ( $char === '-' ) {
$encoded .= '?h';
} elseif ( $char === '?' ) {
$encoded .= '??';
} else {
$encoded .= $char;
}
}
return $encoded;
}
private static function decode( $encoded ) {
$decoded = '';
$length = strlen( $encoded );
for ( $i = 0; $i < $length; ++$i ) {
$char = $encoded[$i];
if ( $char === '?' ) {
$nextChar = isset( $encoded[$i + 1] ) ? $encoded[$i + 1] : null;
if ( $nextChar === 'h' ) {
$decoded .= '-';
++$i;
} elseif ( $nextChar === '?' ) {
$decoded .= '?';
++$i;
} else {
$decoded .= $char;
}
} else {
$decoded .= $char;
}
}
return $decoded;
}
/**
* @return string
*/
function __toString() {
return $this->getId();
}
}
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