gnu-social/classes/Managed_DataObject.php

156 lines
4.1 KiB
PHP

<?php
/*
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2010, StatusNet, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 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 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, see <http://www.gnu.org/licenses/>.
*/
/**
* Wrapper for Memcached_DataObject which knows its own schema definition.
* Builds its own damn settings from a schema definition.
*
* @author Brion Vibber <brion@status.net>
*/
abstract class Managed_DataObject extends Memcached_DataObject
{
/**
* The One True Thingy that must be defined and declared.
*/
public static abstract function schemaDef();
/**
* get/set an associative array of table columns
*
* @access public
* @return array (associative)
*/
function table()
{
$table = self::schemaDef();
return array_map(array($this, 'columnBitmap'), $table['fields']);
}
/**
* get/set an array of table primary keys
*
* Key info is pulled from the table definition array.
*
* @access private
* @return array
*/
function keys()
{
return array_keys($this->keyTypes());
}
/**
* Get a sequence key
*
* Returns the first serial column defined in the table, if any.
*
* @access private
* @return array (column,use_native,sequence_name)
*/
function sequenceKey()
{
$table = self::schemaDef();
foreach ($table['fields'] as $name => $column) {
if ($column['type'] == 'serial') {
// We have a serial/autoincrement column.
// Declare it to be a native sequence!
return array($name, true, false);
}
}
// No sequence key on this table.
return array(false, false, false);
}
/**
* Return key definitions for DB_DataObject and Memcache_DataObject.
*
* DB_DataObject needs to know about keys that the table has; this function
* defines them.
*
* @return array key definitions
*/
function keyTypes()
{
$keys = array();
$table = self::schemaDef();
if (!empty($table['unique keys'])) {
foreach ($table['unique keys'] as $idx => $fields) {
foreach ($fields as $name) {
$keys[$name] = 'U';
}
}
}
if (!empty($table['primary key'])) {
foreach ($table['primary key'] as $name) {
$keys[$name] = 'K';
}
}
return $keys;
}
/**
* Build the appropriate DB_DataObject bitfield map for this field.
*
* @param array $column
* @return int
*/
function columnBitmap($column)
{
$type = 0;
switch ($column['type']) {
case 'int':
case 'serial':
case 'numeric':
// Doesn't need quoting.
$type |= DB_DATAOBJECT_INT;
break;
default:
// Value needs quoting in SQL literal statements.
$type |= DB_DATAOBJECT_STR;
}
switch ($column['type']) {
case 'blob':
$type |= DB_DATAOBJECT_BLOB;
break;
case 'text':
$type |= DB_DATAOBJECT_TXT;
break;
case 'datetime':
$type |= DB_DATAOBJECT_DATE;
$type |= DB_DATAOBJECT_TIME;
break;
case 'timestamp':
$type |= DB_DATAOBJECT_MYSQLTIMESTAMP;
break;
}
if (!empty($column['not null'])) {
$type |= DB_DATAOBJECT_NOTNULL;
}
return $type;
}
}