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<?php
/* SVN FILE: $Id: connection_manager.php 6305 2008-01-02 02:33:56Z phpnut $ */
/**
* Short description for file.
*
* Long description for file
*
* PHP versions 4 and 5
*
* CakePHP(tm) : Rapid Development Framework <http://www.cakephp.org/>
* Copyright 2005-2008, Cake Software Foundation, Inc.
* 1785 E. Sahara Avenue, Suite 490-204
* Las Vegas, Nevada 89104
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @filesource
* @copyright Copyright 2005-2008, Cake Software Foundation, Inc.
* @link http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
* @package cake
* @subpackage cake.cake.libs.model
* @since CakePHP(tm) v 0.10.x.1402
* @version $Revision: 6305 $
* @modifiedby $LastChangedBy: phpnut $
* @lastmodified $Date: 2008-01-01 21:33:56 -0500 (Tue, 01 Jan 2008) $
* @license http://www.opensource.org/licenses/mit-license.php The MIT License
*/
/**
* Manages loaded instances of DataSource objects
*
* Long description for file
*
* @package cake
* @subpackage cake.cake.libs.model
*/
uses ('model' . DS . 'datasources' . DS . 'datasource');
config('database');
class ConnectionManager extends Object {
/**
* Holds a loaded instance of the Connections object
*
* @var class:Connections
* @access public
*/
var $config = null;
/**
* Holds instances DataSource objects
*
* @var array
* @access private
*/
var $_dataSources = array();
/**
* Contains a list of all file and class names used in Connection settings
*
* @var array
* @access private
*/
var $_connectionsEnum = array();
/**
* Constructor.
*
*/
function __construct() {
if (class_exists('DATABASE_CONFIG')) {
$this->config = new DATABASE_CONFIG();
}
}
/**
* Gets a reference to the ConnectionManger object instance
*
* @return object
*/
function &getInstance() {
static $instance = array();
if (!isset($instance[0]) || !$instance[0]) {
$instance[0] = &new ConnectionManager();
}
return $instance[0];
}
/**
* Gets a reference to a DataSource object
*
* @param string $name The name of the DataSource, as defined in app/config/connections
* @return object
*/
function &getDataSource($name) {
$_this =& ConnectionManager::getInstance();
if (in_array($name, array_keys($_this->_dataSources))) {
return $_this->_dataSources[$name];
}
$connections = $_this->enumConnectionObjects();
if (in_array($name, array_keys($connections))) {
$conn = $connections[$name];
$class = $conn['classname'];
$_this->loadDataSource($name);
$_this->_dataSources[$name] =& new $class($_this->config->{$name});
$_this->_dataSources[$name]->configKeyName = $name;
} else {
trigger_error(sprintf(__("ConnectionManager::getDataSource - Non-existent data source %s", true), $name), E_USER_ERROR);
return null;
}
return $_this->_dataSources[$name];
}
/**
* Gets a DataSource name from an object reference
*
* @param object $source
* @return string
*/
function getSourceName(&$source) {
$_this =& ConnectionManager::getInstance();
$names = array_keys($_this->_dataSources);
for ($i = 0; $i < count($names); $i++) {
if ($_this->_dataSources[$names[$i]] === $source) {
return $names[$i];
}
}
return null;
}
/**
* Loads the DataSource class for the given connection name
*
* @param mixed $connName A string name of the connection, as defined in Connections config,
* or an array containing the file and class name of the object.
* @return boolean True on success, null on failure or false if the class is already loaded
*/
function loadDataSource($connName) {
$_this =& ConnectionManager::getInstance();
if (is_array($connName)) {
$conn = $connName;
} else {
$connections = $_this->enumConnectionObjects();
$conn = $connections[$connName];
}
if (isset($conn['parent']) && !empty($conn['parent'])) {
$_this->loadDataSource($conn['parent']);
}
if (class_exists($conn['classname'])) {
return false;
}
if (file_exists(MODELS . DS . $conn['filename'] . '.php')) {
require (MODELS . DS . $conn['filename'] . '.php');
} elseif (fileExistsInPath(LIBS . 'model' . DS . $conn['filename'] . '.php')) {
require (LIBS . 'model' . DS . $conn['filename'] . '.php');
} else {
trigger_error(sprintf(__('Unable to load DataSource file %s.php', true), $conn['filename']), E_USER_ERROR);
return null;
}
}
/**
* Gets a list of class and file names associated with the user-defined DataSource connections
*
* @return array An associative array of elements where the key is the connection name
* (as defined in Connections), and the value is an array with keys 'filename' and 'classname'.
*/
function enumConnectionObjects() {
$_this =& ConnectionManager::getInstance();
if (!empty($_this->_connectionsEnum)) {
return $_this->_connectionsEnum;
}
$connections = get_object_vars($_this->config);
if ($connections != null) {
foreach ($connections as $name => $config) {
$_this->_connectionsEnum[$name] = $_this->__getDriver($config);
}
return $_this->_connectionsEnum;
} else {
$_this->cakeError('missingConnection', array(array('className' => 'ConnectionManager')));
}
}
/**
* Dynamically creates a DataSource object at runtime, with the given name and settings
*
* @param string $name The DataSource name
* @param array $config The DataSource configuration settings
* @return object A reference to the DataSource object, or null if creation failed
*/
function &create($name = '', $config = array()) {
$_this =& ConnectionManager::getInstance();
if (empty($name) || empty($config) || array_key_exists($name, $_this->_connectionsEnum)) {
$null = null;
return $null;
}
$_this->config->{$name} = $config;
$_this->_connectionsEnum[$name] = $_this->__getDriver($config);
return $_this->getDataSource($name);
}
/**
* Private method
*
* Returns the file and class name for the given driver
*/
function __getDriver($config) {
$_this =& ConnectionManager::getInstance();
if (!isset($config['datasource'])) {
$config['datasource'] = 'dbo';
}
if (isset($config['driver']) && $config['driver'] != null && !empty($config['driver'])) {
$filename = $config['datasource'] . DS . $config['datasource'] . '_' . $config['driver'];
$classname = Inflector::camelize(strtolower($config['datasource'] . '_' . $config['driver']));
$parent = $_this->__getDriver(array('datasource' => $config['datasource']));
} else {
$filename = 'datasources' . DS . $config['datasource'] . '_source';
$classname = Inflector::camelize(strtolower($config['datasource'] . '_source'));
$parent = null;
}
return array('filename' => $filename, 'classname' => $classname, 'parent' => $parent);
}
/**
* Destructor.
*
*/
function __destruct() {
if (CAKE_SESSION_SAVE == 'database' && function_exists('session_write_close')) {
session_write_close();
}
}
}
?>
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