Registry.php
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Registry.php
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	<?php
	/**
	* Zend Framework
	*
	* LICENSE
	*
	* This source file is subject to the new BSD license that is bundled
	* with this package in the file LICENSE.txt.
	* It is also available through the world-wide-web at this URL:
	* http://framework.zend.com/license/new-bsd
	* If you did not receive a copy of the license and are unable to
	* obtain it through the world-wide-web, please send an email
	* to license@zend.com so we can send you a copy immediately.
	*
	* @category Syncroton
	* @package Syncroton_Registry
	* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
	* @license http://framework.zend.com/license/new-bsd New BSD License
	* @version $Id: Registry.php 10020 2009-08-18 14:34:09Z j.fischer@metaways.de $
	*/

	/**
	* Generic storage class helps to manage global data.
	*
	* @category Syncroton
	* @package Syncroton_Registry
	* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
	* @license http://framework.zend.com/license/new-bsd New BSD License
	*/
	class Syncroton_Registry extends ArrayObject
	{
	const CALENDAR_DATA_CLASS = 'calendar_data_class';
	const CONTACTS_DATA_CLASS = 'contacts_data_class';
	const EMAIL_DATA_CLASS = 'email_data_class';
	const TASKS_DATA_CLASS = 'tasks_data_class';
	const GAL_DATA_CLASS = 'gal_data_class';

	const DEFAULT_POLICY = 'default_policy';

	const DATABASE = 'database';
	const TRANSACTIONMANAGER = 'transactionmanager';

	const CONTENTSTATEBACKEND = 'contentstatebackend';
	const DEVICEBACKEND = 'devicebackend';
	const FOLDERBACKEND = 'folderbackend';
	const POLICYBACKEND = 'policybackend';
	const SYNCSTATEBACKEND = 'syncstatebackend';

	/**
	* Class name of the singleton registry object.
	* @var string
	*/
	private static $_registryClassName = 'Syncroton_Registry';

	/**
	* Registry object provides storage for shared objects.
	* @var Syncroton_Registry
	*/
	private static $_registry = null;

	/**
	* Retrieves the default registry instance.
	*
	* @return Syncroton_Registry
	*/
	public static function getInstance()
	{
	if (self::$_registry === null) {
	self::init();
	}

	return self::$_registry;
	}

	/**
	* @return Zend_Db_Adapter_Abstract
	*/
	public static function getDatabase()
	{
	return self::get(self::DATABASE);
	}

	/**
	* return transaction manager class
	*
	* @return Syncroton_TransactionManagerInterface
	*/
	public static function getTransactionManager()
	{
	if (!self::isRegistered(self::TRANSACTIONMANAGER)) {
	self::set(self::TRANSACTIONMANAGER, Syncroton_TransactionManager::getInstance());
	}

	return self::get(self::TRANSACTIONMANAGER);
	}

	/**
	* Set the default registry instance to a specified instance.
	*
	* @param Syncroton_Registry $registry An object instance of type Syncroton_Registry,
	* or a subclass.
	* @return void
	* @throws Zend_Exception if registry is already initialized.
	*/
	public static function setInstance(Syncroton_Registry $registry)
	{
	if (self::$_registry !== null) {
	require_once 'Zend/Exception.php';
	throw new Zend_Exception('Registry is already initialized');
	}

	self::setClassName(get_class($registry));
	self::$_registry = $registry;
	}

	/**
	* Initialize the default registry instance.
	*
	* @return void
	*/
	protected static function init()
	{
	self::setInstance(new self::$_registryClassName());
	}

	/**
	* Set the class name to use for the default registry instance.
	* Does not affect the currently initialized instance, it only applies
	* for the next time you instantiate.
	*
	* @param string $registryClassName
	* @return void
	* @throws Zend_Exception if the registry is initialized or if the
	* class name is not valid.
	*/
	public static function setClassName($registryClassName = 'Syncroton_Registry')
	{
	if (self::$_registry !== null) {
	require_once 'Zend/Exception.php';
	throw new Zend_Exception('Registry is already initialized');
	}

	if (!is_string($registryClassName)) {
	require_once 'Zend/Exception.php';
	throw new Zend_Exception("Argument is not a class name");
	}

	/**
	* @see Zend_Loader
	*/
	if (!class_exists($registryClassName)) {
	require_once 'Zend/Loader.php';
	Zend_Loader::loadClass($registryClassName);
	}

	self::$_registryClassName = $registryClassName;
	}

	/**
	* Unset the default registry instance.
	* Primarily used in tearDown() in unit tests.
	* @returns void
	*/
	public static function _unsetInstance()
	{
	self::$_registry = null;
	}

	/**
	* getter method, basically same as offsetGet().
	*
	* This method can be called from an object of type Syncroton_Registry, or it
	* can be called statically. In the latter case, it uses the default
	* static instance stored in the class.
	*
	* @param string $index - get the value associated with $index
	* @return mixed
	* @throws Zend_Exception if no entry is registerd for $index.
	*/
	public static function get($index)
	{
	$instance = self::getInstance();

	if (!$instance->offsetExists($index)) {
	require_once 'Zend/Exception.php';
	throw new Zend_Exception("No entry is registered for key '$index'");
	}

	return $instance->offsetGet($index);
	}

	/**
	* returns content state backend
	*
	* creates Syncroton_Backend_Content on the fly if not before via
	* Syncroton_Registry::set(self::CONTENTSTATEBACKEND, $backend);
	*
	* @return Syncroton_Backend_IContent
	*/
	public static function getContentStateBackend()
	{
	if (!self::isRegistered(self::CONTENTSTATEBACKEND)) {
	self::set(self::CONTENTSTATEBACKEND, new Syncroton_Backend_Content(self::getDatabase()));
	}

	return self::get(self::CONTENTSTATEBACKEND);
	}

	/**
	* returns device backend
	*
	* creates Syncroton_Backend_Device on the fly if not before via
	* Syncroton_Registry::set(self::DEVICEBACKEND, $backend);
	*
	* @return Syncroton_Backend_IDevice
	*/
	public static function getDeviceBackend()
	{
	if (!self::isRegistered(self::DEVICEBACKEND)) {
	self::set(self::DEVICEBACKEND, new Syncroton_Backend_Device(self::getDatabase()));
	}

	return self::get(self::DEVICEBACKEND);
	}

	/**
	* returns folder backend
	*
	* creates Syncroton_Backend_Folder on the fly if not before via
	* Syncroton_Registry::set(self::FOLDERBACKEND, $backend);
	*
	* @return Syncroton_Backend_IFolder
	*/
	public static function getFolderBackend()
	{
	if (!self::isRegistered(self::FOLDERBACKEND)) {
	self::set(self::FOLDERBACKEND, new Syncroton_Backend_Folder(self::getDatabase()));
	}

	return self::get(self::FOLDERBACKEND);
	}

	/**
	* returns policy backend
	*
	* creates Syncroton_Backend_Policy on the fly if not set before via
	* Syncroton_Registry::set(self::POLICYBACKEND, $backend);
	*
	* @return Syncroton_Backend_ISyncState
	*/
	public static function getPolicyBackend()
	{
	if (!self::isRegistered(self::POLICYBACKEND)) {
	self::set(self::POLICYBACKEND, new Syncroton_Backend_Policy(self::getDatabase()));
	}

	return self::get(self::POLICYBACKEND);
	}

	/**
	* returns syncstate backend
	*
	* creates Syncroton_Backend_SyncState on the fly if not before via
	* Syncroton_Registry::set(self::SYNCSTATEBACKEND, $backend);
	*
	* @return Syncroton_Backend_ISyncState
	*/
	public static function getSyncStateBackend()
	{
	if (!self::isRegistered(self::SYNCSTATEBACKEND)) {
	self::set(self::SYNCSTATEBACKEND, new Syncroton_Backend_SyncState(self::getDatabase()));
	}

	return self::get(self::SYNCSTATEBACKEND);
	}

	/**
	* setter method, basically same as offsetSet().
	*
	* This method can be called from an object of type Syncroton_Registry, or it
	* can be called statically. In the latter case, it uses the default
	* static instance stored in the class.
	*
	* @param string $index The location in the ArrayObject in which to store
	* the value.
	* @param mixed $value The object to store in the ArrayObject.
	* @return void
	*/
	public static function set($index, $value)
	{
	$instance = self::getInstance();
	$instance->offsetSet($index, $value);
	}

	public static function setDatabase(Zend_Db_Adapter_Abstract $db)
	{
	self::set(self::DATABASE, $db);
	}

	public static function setCalendarDataClass($className)
	{
	if (!class_exists($className)) {
	throw new InvalidArgumentException('invalid $_className provided');
	}

	self::set(self::CALENDAR_DATA_CLASS, $className);
	}

	public static function setContactsDataClass($className)
	{
	if (!class_exists($className)) {
	throw new InvalidArgumentException('invalid $_className provided');
	}

	self::set(self::CONTACTS_DATA_CLASS, $className);
	}

	public static function setEmailDataClass($className)
	{
	if (!class_exists($className)) {
	throw new InvalidArgumentException('invalid $_className provided');
	}

	self::set(self::EMAIL_DATA_CLASS, $className);
	}

	public static function setTasksDataClass($className)
	{
	if (!class_exists($className)) {
	throw new InvalidArgumentException('invalid $_className provided');
	}

	self::set(self::TASKS_DATA_CLASS, $className);
	}

	public static function setGALDataClass($className)
	{
	if (!class_exists($className)) {
	throw new InvalidArgumentException('invalid $_className provided');
	}

	self::set(self::GAL_DATA_CLASS, $className);
	}

	public static function setTransactionManager($manager)
	{
	self::set(self::TRANSACTIONMANAGER, $manager);
	}

	/**
	* Returns TRUE if the $index is a named value in the registry,
	* or FALSE if $index was not found in the registry.
	*
	* @param string $index
	* @return boolean
	*/
	public static function isRegistered($index)
	{
	if (self::$_registry === null) {
	return false;
	}
	return self::$_registry->offsetExists($index);
	}

	/**
	* Constructs a parent ArrayObject with default
	* ARRAY_AS_PROPS to allow acces as an object
	*
	* @param array $array data array
	* @param integer $flags ArrayObject flags
	*/
	public function __construct($array = array(), $flags = parent::ARRAY_AS_PROPS)
	{
	parent::__construct($array, $flags);
	}

	/**
	* @param string $index
	* @returns mixed
	*
	* Workaround for http://bugs.php.net/bug.php?id=40442 (ZF-960).
	*/
	public function offsetExists($index)
	{
	return array_key_exists($index, $this);
	}

	}

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