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<?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()
{
// Hack for PHP 5.2 not supporting late static binding
//$table = static::schemaDef();
$table = call_user_func(array(get_class($this), '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 = $column['type'];
// For quoting style...
$intTypes = array('int',
'integer',
'float',
'serial',
'numeric');
if (in_array($type, $intTypes)) {
$style = DB_DATAOBJECT_INT;
} else {
$style = DB_DATAOBJECT_STR;
}
// Data type formatting style...
$formatStyles = array('blob' => DB_DATAOBJECT_BLOB,
'text' => DB_DATAOBJECT_TXT,
'date' => DB_DATAOBJECT_DATE,
'time' => DB_DATAOBJECT_TIME,
'datetime' => DB_DATAOBJECT_DATE | DB_DATAOBJECT_TIME,
'timestamp' => DB_DATAOBJECT_MYSQLTIMESTAMP);
if (isset($formatStyles[$type])) {
$style |= $formatStyles[$type];
}
// Nullable?
if (!empty($column['not null'])) {
$style |= DB_DATAOBJECT_NOTNULL;
}
return $style;
}
}
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