lib/mshoplib/src/MShop/Locale/Manager/Default.php

<?php

/**
 * @copyright Copyright (c) Metaways Infosystems GmbH, 2011
 * @license LGPLv3, http://www.arcavias.com/en/license
 * @package MShop
 * @subpackage Locale
 */


/**
 * Default locale manager implementation.
 *
 * @package MShop
 * @subpackage Locale
 */
class MShop_Locale_Manager_Default
	extends MShop_Locale_Manager_Abstract
	implements MShop_Locale_Manager_Interface
{
	private $_searchConfig = array(
		'locale.id' => array(
			'code' => 'locale.id',
			'internalcode' => 'mloc."id"',
			'label' => 'Locale ID',
			'type' => 'integer',
			'internaltype' => MW_DB_Statement_Abstract::PARAM_INT,
			'public' => false,
		),
		'locale.siteid' => array(
			'code' => 'locale.siteid',
			'internalcode' => 'mloc."siteid"',
			'label' => 'Locale site',
			'type' => 'integer',
			'internaltype' => MW_DB_Statement_Abstract::PARAM_INT,
			'public' => false,
		),
		'locale.languageid' => array(
			'code' => 'locale.languageid',
			'internalcode' => 'mloc."langid"',
			'label' => 'Locale language ID',
			'type' => 'string',
			'internaltype' => MW_DB_Statement_Abstract::PARAM_STR,
		),
		'locale.currencyid' => array(
			'code' => 'locale.currencyid',
			'internalcode' => 'mloc."currencyid"',
			'label' => 'Locale currency ID',
			'type' => 'string',
			'internaltype' => MW_DB_Statement_Abstract::PARAM_STR,
		),
		'locale.position' => array(
			'code' => 'locale.position',
			'internalcode' => 'mloc."pos"',
			'label' => 'Locale position',
			'type' => 'integer',
			'internaltype' => MW_DB_Statement_Abstract::PARAM_INT,
		),
		'locale.status' => array(
			'code' => 'locale.status',
			'internalcode' => 'mloc."status"',
			'label' => 'Locale status',
			'type' => 'integer',
			'internaltype' => MW_DB_Statement_Abstract::PARAM_INT,
		),
		'locale.ctime'=> array(
			'code'=>'locale.ctime',
			'internalcode'=>'mloc."ctime"',
			'label'=>'Locale create date/time',
			'type'=> 'datetime',
			'internaltype'=> MW_DB_Statement_Abstract::PARAM_STR
		),
		'locale.mtime'=> array(
			'code'=>'locale.mtime',
			'internalcode'=>'mloc."mtime"',
			'label'=>'Locale modification date/time',
			'type'=> 'datetime',
			'internaltype'=> MW_DB_Statement_Abstract::PARAM_STR
		),
		'locale.editor'=> array(
			'code'=>'locale.editor',
			'internalcode'=>'mloc."editor"',
			'label'=>'Locale editor',
			'type'=> 'string',
			'internaltype'=> MW_DB_Statement_Abstract::PARAM_STR
		),
	);


	/**
	 * Initializes the object.
	 *
	 * @param MShop_Context_Item_Interface $context Context object
	 */
	public function __construct( MShop_Context_Item_Interface $context )
	{
		parent::__construct( $context );
		$this->_setResourceName( 'db-locale' );
	}


	/**
	 * Returns the locale item for the given site code, language code and currency code.
	 *
	 * @param string $site Site code
	 * @param string $lang Language code (optional)
	 * @param string $currency Currency code (optional)
	 * @param boolean $active Flag to get only active items (optional)
	 * @param integer|null $level Constant from abstract class which site ID levels should be available (optional),
	 * 	based on config or value for SITE_PATH if null
	 * @return MShop_Locale_Item_Interface Locale item for the given parameters
	 * @throws MShop_Locale_Exception If no locale item is found
	 */
	public function bootstrap( $site, $lang = '', $currency = '', $active = true, $level = null )
	{
		$siteManager = $this->getSubManager( 'site' );
		$siteSearch = $siteManager->createSearch();
		$siteSearch->setConditions( $siteSearch->compare( '==', 'locale.site.code', $site ) );
		$siteItems = $siteManager->searchItems( $siteSearch );

		if( ( $siteItem = reset( $siteItems ) ) === false ) {
			throw new MShop_Locale_Exception( sprintf( 'Site for code "%1$s" not found', $site ) );
		}

		$siteIds = array( $siteItem->getId() );

		return $this->_bootstrap( $site, $lang, $currency, $active, $siteItem, $siteIds, $siteIds );
	}


	/**
	 * Creates a new locale item object.
	 *
	 * @return MShop_Locale_Item_Interface
	 */
	public function createItem()
	{
		try {
			return $this->_createItem( array( 'siteid' => $this->_getContext()->getLocale()->getSiteId() ) );
		} catch ( Exception $e ) {
			return $this->_createItem();
		}
	}


	/**
	 * Creates a search object and sets base criteria.
	 *
	 * @param boolean $default
	 * @return MW_Common_Criteria_Interface
	 */
	public function createSearch( $default = false )
	{
		if ( $default === true ) {
			return parent::_createSearch('locale');
		}

		return parent::createSearch();
	}


	/**
	 * Returns the item specified by its ID.
	 *
	 * @param integer $id Unique ID of the locale item
	 * @param array $ref List of domains to fetch list items and referenced items for
	 * @return MShop_Locale_Item_Interface Returns the locale item of the given id
	 * @throws MShop_Exception If item couldn't be found
	 */
	public function getItem( $id, array $ref = array() )
	{
		return $this->_getItem( 'locale.id', $id, $ref );
	}


	/**
	 * Searches for all items matching the given critera.
	 *
	 * @param MW_Common_Criteria_Interface $search Criteria object with conditions, sortations, etc.
	 * @param array $ref List of domains to fetch list items and referenced items for
	 * @param integer &$total Number of items that are available in total
	 * @return array List of items implementing MShop_Common_Item_Interface
	 */
	public function searchItems( MW_Common_Criteria_Interface $search, array $ref = array(), &$total = null )
	{
		$locale = $this->_getContext()->getLocale();
		$siteIds = $locale->getSitePath();
		$siteIds[] = $locale->getSiteId();
		$items = array();

		$search = clone $search;
		$expr = array(
			$search->compare( '==', 'locale.siteid', $siteIds ),
			$search->getConditions(),
		);
		$search->setConditions( $search->combine( '&&', $expr ) );

		foreach( $this->_search( $search, $ref, $total ) as $row ) {
			$items[ $row['id'] ] = $this->_createItem( $row );
		}

		return $items;
	}


	/**
	 * Removes multiple items specified by ids in the array.
	 *
	 * @param array $ids List of IDs
	 */
	public function deleteItems( array $ids )
	{
		/** mshop/locale/manager/default/item/delete
		 * Deletes the items matched by the given IDs from the database
		 *
		 * Removes the records specified by the given IDs from the locale database.
		 * The records must be from the site that is configured via the
		 * context item.
		 *
		 * The ":cond" placeholder is replaced by the name of the ID column and
		 * the given ID or list of IDs while the site ID is bound to the question
		 * mark.
		 *
		 * The SQL statement should conform to the ANSI standard to be
		 * compatible with most relational database systems. This also
		 * includes using double quotes for table and column names.
		 *
		 * @param string SQL statement for deleting items
		 * @since 2014.03
		 * @category Developer
		 * @see mshop/locale/manager/default/item/insert
		 * @see mshop/locale/manager/default/item/update
		 * @see mshop/locale/manager/default/item/newid
		 * @see mshop/locale/manager/default/item/search
		 * @see mshop/locale/manager/default/item/count
		 */
		$path = 'mshop/locale/manager/default/item/delete';
		$this->_deleteItems( $ids, $this->_getContext()->getConfig()->get( $path, $path ) );
	}


	/**
	 * Adds or updates an item object.
	 *
	 * @param MShop_Common_Item_Interface $item Item object whose data should be saved
	 * @param boolean $fetch True if the new ID should be returned in the item
	 */
	public function saveItem( MShop_Common_Item_Interface $item, $fetch = true )
	{
		$iface = 'MShop_Locale_Item_Interface';
		if ( !( $item instanceof $iface ) ) {
			throw new MShop_Locale_Exception(sprintf('Object is not of required type "%1$s"', $iface));
		}

		if( !$item->isModified() ) { return; }

		$context = $this->_getContext();

		$dbm = $context->getDatabaseManager();
		$dbname = $this->_getResourceName();
		$conn = $dbm->acquire( $dbname );

		try
		{
			$id = $item->getId();
			$date = date( 'Y-m-d H:i:s' );

			if( $id === null )
			{
				/** mshop/locale/manager/default/item/insert
				 * Inserts a new locale record into the database table
				 *
				 * Items with no ID yet (i.e. the ID is NULL) will be created in
				 * the database and the newly created ID retrieved afterwards
				 * using the "newid" SQL statement.
				 *
				 * The SQL statement must be a string suitable for being used as
				 * prepared statement. It must include question marks for binding
				 * the values from the locale item to the statement before they are
				 * sent to the database server. The number of question marks must
				 * be the same as the number of columns listed in the INSERT
				 * statement. The order of the columns must correspond to the
				 * order in the saveItems() method, so the correct values are
				 * bound to the columns.
				 *
				 * The SQL statement should conform to the ANSI standard to be
				 * compatible with most relational database systems. This also
				 * includes using double quotes for table and column names.
				 *
				 * @param string SQL statement for inserting records
				 * @since 2014.03
				 * @category Developer
				 * @see mshop/locale/manager/default/item/update
				 * @see mshop/locale/manager/default/item/newid
				 * @see mshop/locale/manager/default/item/delete
				 * @see mshop/locale/manager/default/item/search
				 * @see mshop/locale/manager/default/item/count
				 */
				$path = 'mshop/locale/manager/default/item/insert';
			}
			else
			{
				/** mshop/locale/manager/default/item/update
				 * Updates an existing locale record in the database
				 *
				 * Items which already have an ID (i.e. the ID is not NULL) will
				 * be updated in the database.
				 *
				 * The SQL statement must be a string suitable for being used as
				 * prepared statement. It must include question marks for binding
				 * the values from the locale item to the statement before they are
				 * sent to the database server. The order of the columns must
				 * correspond to the order in the saveItems() method, so the
				 * correct values are bound to the columns.
				 *
				 * The SQL statement should conform to the ANSI standard to be
				 * compatible with most relational database systems. This also
				 * includes using double quotes for table and column names.
				 *
				 * @param string SQL statement for updating records
				 * @since 2014.03
				 * @category Developer
				 * @see mshop/locale/manager/default/item/insert
				 * @see mshop/locale/manager/default/item/newid
				 * @see mshop/locale/manager/default/item/delete
				 * @see mshop/locale/manager/default/item/search
				 * @see mshop/locale/manager/default/item/count
				 */
				$path = 'mshop/locale/manager/default/item/update';
			}

			$stmt = $this->_getCachedStatement( $conn, $path );

			$stmt->bind( 1, $item->getSiteId(), MW_DB_Statement_Abstract::PARAM_INT );
			$stmt->bind( 2, $item->getLanguageId() );
			$stmt->bind( 3, $item->getCurrencyId() );
			$stmt->bind( 4, $item->getPosition(), MW_DB_Statement_Abstract::PARAM_INT );
			$stmt->bind( 5, $item->getStatus(), MW_DB_Statement_Abstract::PARAM_INT );
			$stmt->bind( 6, $date ); // mtime
			$stmt->bind( 7, $context->getEditor() );

			if( $id !== null ) {
				$stmt->bind( 8, $id, MW_DB_Statement_Abstract::PARAM_INT );
				$item->setId( $id ); //so item is no longer modified
			} else {
				$stmt->bind( 8, $date ); // ctime
			}

			$stmt->execute()->finish();

			if( $id === null && $fetch === true )
			{
				/** mshop/locale/manager/default/item/newid
				 * Retrieves the ID generated by the database when inserting a new record
				 *
				 * As soon as a new record is inserted into the database table,
				 * the database server generates a new and unique identifier for
				 * that record. This ID can be used for retrieving, updating and
				 * deleting that specific record from the table again.
				 *
				 * For MySQL:
				 *  SELECT LAST_INSERT_ID()
				 * For PostgreSQL:
				 *  SELECT currval('seq_mloc_id')
				 * For SQL Server:
				 *  SELECT SCOPE_IDENTITY()
				 * For Oracle:
				 *  SELECT "seq_mloc_id".CURRVAL FROM DUAL
				 *
				 * There's no way to retrive the new ID by a SQL statements that
				 * fits for most database servers as they implement their own
				 * specific way.
				 *
				 * @param string SQL statement for retrieving the last inserted record ID
				 * @since 2014.03
				 * @category Developer
				 * @see mshop/locale/manager/default/item/insert
				 * @see mshop/locale/manager/default/item/update
				 * @see mshop/locale/manager/default/item/delete
				 * @see mshop/locale/manager/default/item/search
				 * @see mshop/locale/manager/default/item/count
				 */
				$path = 'mshop/locale/manager/default/item/newid';
				$item->setId( $this->_newId( $conn, $context->getConfig()->get( $path, $path ) ) );
			}

			$dbm->release( $conn, $dbname );
		}
		catch ( Exception $e )
		{
			$dbm->release( $conn, $dbname );
			throw $e;
		}
	}


	/**
	 * Returns a new manager for locale extensions
	 *
	 * @param string $manager Name of the sub manager type in lower case
	 * @param string|null $name Name of the implementation, will be from configuration (or Default) if null
	 * @return MShop_Common_Manager_Interface Manager for different extensions, e.g site, language, currency.
	 */
	public function getSubManager( $manager, $name = null )
	{
		/** classes/locale/manager/name
		 * Class name of the used locale manager implementation
		 *
		 * Each default locale manager can be replaced by an alternative imlementation.
		 * To use this implementation, you have to set the last part of the class
		 * name as configuration value so the manager factory knows which class it
		 * has to instantiate.
		 *
		 * For example, if the name of the default class is
		 *
		 *  MShop_Locale_Manager_Default
		 *
		 * and you want to replace it with your own version named
		 *
		 *  MShop_Locale_Manager_Mylocale
		 *
		 * then you have to set the this configuration option:
		 *
		 *  classes/locale/manager/name = Mylocale
		 *
		 * The value is the last part of your own class name and it's case sensitive,
		 * so take care that the configuration value is exactly named like the last
		 * part of the class name.
		 *
		 * The allowed characters of the class name are A-Z, a-z and 0-9. No other
		 * characters are possible! You should always start the last part of the class
		 * name with an upper case character and continue only with lower case characters
		 * or numbers. Avoid chamel case names like "MyLocale"!
		 *
		 * @param string Last part of the class name
		 * @since 2014.03
		 * @category Developer
		 */

		/** mshop/locale/manager/decorators/excludes
		 * Excludes decorators added by the "common" option from the locale manager
		 *
		 * Decorators extend the functionality of a class by adding new aspects
		 * (e.g. log what is currently done), executing the methods of the underlying
		 * class only in certain conditions (e.g. only for logged in users) or
		 * modify what is returned to the caller.
		 *
		 * This option allows you to remove a decorator added via
		 * "mshop/common/manager/decorators/default" before they are wrapped
		 * around the locale manager.
		 *
		 *  mshop/locale/manager/decorators/excludes = array( 'decorator1' )
		 *
		 * This would remove the decorator named "decorator1" from the list of
		 * common decorators ("MShop_Common_Manager_Decorator_*") added via
		 * "mshop/common/manager/decorators/default" for the locale manager.
		 *
		 * @param array List of decorator names
		 * @since 2014.03
		 * @category Developer
		 * @see mshop/common/manager/decorators/default
		 * @see mshop/locale/manager/decorators/global
		 * @see mshop/locale/manager/decorators/local
		 */

		/** mshop/locale/manager/decorators/global
		 * Adds a list of globally available decorators only to the locale manager
		 *
		 * Decorators extend the functionality of a class by adding new aspects
		 * (e.g. log what is currently done), executing the methods of the underlying
		 * class only in certain conditions (e.g. only for logged in users) or
		 * modify what is returned to the caller.
		 *
		 * This option allows you to wrap global decorators
		 * ("MShop_Common_Manager_Decorator_*") around the locale manager.
		 *
		 *  mshop/locale/manager/decorators/global = array( 'decorator1' )
		 *
		 * This would add the decorator named "decorator1" defined by
		 * "MShop_Common_Manager_Decorator_Decorator1" only to the locale controller.
		 *
		 * @param array List of decorator names
		 * @since 2014.03
		 * @category Developer
		 * @see mshop/common/manager/decorators/default
		 * @see mshop/locale/manager/decorators/excludes
		 * @see mshop/locale/manager/decorators/local
		 */

		/** mshop/locale/manager/decorators/local
		 * Adds a list of local decorators only to the locale manager
		 *
		 * Decorators extend the functionality of a class by adding new aspects
		 * (e.g. log what is currently done), executing the methods of the underlying
		 * class only in certain conditions (e.g. only for logged in users) or
		 * modify what is returned to the caller.
		 *
		 * This option allows you to wrap local decorators
		 * ("MShop_Common_Manager_Decorator_*") around the locale manager.
		 *
		 *  mshop/locale/manager/decorators/local = array( 'decorator2' )
		 *
		 * This would add the decorator named "decorator2" defined by
		 * "MShop_Common_Manager_Decorator_Decorator2" only to the locale
		 * controller.
		 *
		 * @param array List of decorator names
		 * @since 2014.03
		 * @category Developer
		 * @see mshop/common/manager/decorators/default
		 * @see mshop/locale/manager/decorators/excludes
		 * @see mshop/locale/manager/decorators/global
		 */

		return $this->_getSubManager('locale', $manager, $name);
	}


	/**
	 * Returns the attributes that can be used for searching.
	 *
	 * @param boolean $withsub Return also attributes of sub-managers if true
	 * @return array List of attribute items implementing MW_Common_Criteria_Attribute_Interface
	 */
	public function getSearchAttributes( $withsub = true )
	{
		/** classes/locale/manager/submanagers
		 * List of manager names that can be instantiated by the locale manager
		 *
		 * Managers provide a generic interface to the underlying storage.
		 * Each manager has or can have sub-managers caring about particular
		 * aspects. Each of these sub-managers can be instantiated by its
		 * parent manager using the getSubManager() method.
		 *
		 * The search keys from sub-managers can be normally used in the
		 * manager as well. It allows you to search for items of the manager
		 * using the search keys of the sub-managers to further limit the
		 * retrieved list of items.
		 *
		 * @param array List of sub-manager names
		 * @since 2014.03
		 * @category Developer
		 */
		$path = 'classes/locale/manager/submanagers';
		$default = array( 'language', 'currency', 'site' );

		return $this->_getSearchAttributes( $this->_searchConfig, $path, $default, $withsub );
	}


	/**
	 * Returns the locale item for the given site code, language code and currency code.
	 *
	 * If the locale item is inherited from a parent site, the site ID of this locale item
	 * is changed to the site ID of the actual site. This ensures that items assigned to
	 * the same site as the site item are still used.
	 *
	 * @param string $site Site code
	 * @param string $lang Language code
	 * @param string $currency Currency code
	 * @param boolean $active Flag to get only active items
	 * @param MShop_Locale_Item_Site_Interface Site item
	 * @param array $sitePath List of site IDs up to the root site
	 * @param array $siteSubTree List of site IDs below and including the current site
	 * @return MShop_Locale_Item_Interface Locale item for the given parameters
	 * @throws MShop_Locale_Exception If no locale item is found
	 */
	protected function _bootstrap( $site, $lang, $currency, $active,
		MShop_Locale_Item_Site_Interface $siteItem, array $sitePath, array $siteSubTree )
	{
		$siteId = $siteItem->getId();

		$result = $this->_bootstrapMatch( $siteId, $lang, $currency, $active, $siteItem, $sitePath, $siteSubTree );

		if( $result !== false ) {
			return $result;
		}

		$result = $this->_bootstrapClosest( $siteId, $lang, $active, $siteItem, $sitePath, $siteSubTree );

		if( $result !== false ) {
			return $result;
		}

		throw new MShop_Locale_Exception( sprintf( 'Locale item for site "%1$s" not found', $site ) );
	}


	/**
	 * Returns the matching locale item for the given site code, language code and currency code.
	 *
	 * If the locale item is inherited from a parent site, the site ID of this locale item
	 * is changed to the site ID of the actual site. This ensures that items assigned to
	 * the same site as the site item are still used.
	 *
	 * @param string $siteId Site ID
	 * @param string $lang Language code
	 * @param string $currency Currency code
	 * @param boolean $active Flag to get only active items
	 * @param MShop_Locale_Item_Site_Interface Site item
	 * @param array $sitePath List of site IDs up to the root site
	 * @param array $siteSubTree List of site IDs below and including the current site
	 * @return MShop_Locale_Item_Interface|boolean Locale item for the given parameters or false if no item was found
	 */
	private function _bootstrapMatch( $siteId, $lang, $currency, $active,
		MShop_Locale_Item_Site_Interface $siteItem, array $sitePath, array $siteSubTree )
	{
		// Try to find exact match
		$search = $this->createSearch( $active );

		$expr = array( $search->compare( '==', 'locale.siteid', $sitePath ) );

		if( !empty( $lang ) ) {
			$expr[] = $search->compare( '==', 'locale.languageid', $lang );
		}

		if( !empty( $currency ) ) {
			$expr[] = $search->compare( '==', 'locale.currencyid', $currency );
		}

		$expr[] = $search->getConditions();


		if ( $active === true )
		{
			$expr[] = $search->compare( '>', 'locale.currency.status', 0 );
			$expr[] = $search->compare( '>', 'locale.language.status', 0 );
			$expr[] = $search->compare( '>', 'locale.site.status', 0 );
		}

		$search->setConditions( $search->combine( '&&', $expr ) );
		$result = $this->_search( $search );

		// Try to find first item where site matches
		foreach( $result as $row )
		{
			if( $row['siteid'] == $siteId ) {
				return $this->_createItem( $row, $siteItem, $sitePath, $siteSubTree );
			}
		}

		if( ( $row = reset( $result ) ) !== false )
		{
			$row['siteid'] = $siteId;
			return $this->_createItem( $row, $siteItem, $sitePath, $siteSubTree );
		}

		return false;
	}


	/**
	 * Returns the locale item for the given site code, language code and currency code.
	 *
	 * If the locale item is inherited from a parent site, the site ID of this locale item
	 * is changed to the site ID of the actual site. This ensures that items assigned to
	 * the same site as the site item are still used.
	 *
	 * @param string $siteId Site ID
	 * @param string $lang Language code
	 * @param boolean $active Flag to get only active items
	 * @param MShop_Locale_Item_Site_Interface Site item
	 * @param array $sitePath List of site IDs up to the root site
	 * @param array $siteSubTree List of site IDs below and including the current site
	 * @return MShop_Locale_Item_Interface|boolean Locale item for the given parameters or false if no item was found
	 */
	private function _bootstrapClosest( $siteId, $lang, $active,
		MShop_Locale_Item_Site_Interface $siteItem, array $sitePath, array $siteSubTree )
	{
		// Try to find the best matching locale
		$search = $this->createSearch( $active );

		$expr = array (
			$search->compare( '==', 'locale.siteid', $sitePath ),
			$search->getConditions()
		);

		if ( $active === true )
		{
			$expr[] = $search->compare( '>', 'locale.currency.status', 0 );
			$expr[] = $search->compare( '>', 'locale.language.status', 0 );
			$expr[] = $search->compare( '>', 'locale.site.status', 0 );
		}

		$search->setConditions( $search->combine( '&&', $expr ) );
		$search->setSortations( array( $search->sort( '+', 'locale.position' ) ) );
		$result = $this->_search( $search );

		// Try to find first item where site and language matches
		foreach( $result as $row )
		{
			if( $row['siteid'] == $siteId && $row['langid'] == $lang ) {
				return $this->_createItem( $row, $siteItem, $sitePath, $siteSubTree );
			}
		}

		// Try to find first item where language matches
		foreach( $result as $row )
		{
			if( $row['langid'] == $lang )
			{
				$row['siteid'] = $siteId;
				return $this->_createItem( $row, $siteItem, $sitePath, $siteSubTree );
			}
		}

		// Try to find first item where site matches
		foreach( $result as $row )
		{
			if( $row['siteid'] == $siteId ) {
				return $this->_createItem( $row, $siteItem, $sitePath, $siteSubTree );
			}
		}

		// Return first item (no other match found)
		if( ( $row = reset( $result ) ) !== false )
		{
			$row['siteid'] = $siteId;
			return $this->_createItem( $row, $siteItem, $sitePath, $siteSubTree );
		}

		return false;
	}


	/**
	 * Instances a new locale item object.
	 *
	 * @param array $values Parameter to initialise the item
	 * @param MShop_Locale_Item_Site_Interface $site Site item
	 * @param array $sitePath List of site IDs up to the root site
	 * @param array $siteSubTree List of site IDs below and including the current site
	 * @return MShop_Locale_Item_Default Locale item
	 */
	protected function _createItem( array $values = array( ), MShop_Locale_Item_Site_Interface $site = null,
		array $sitePath = array(), array $siteSubTree = array() )
	{
		return new MShop_Locale_Item_Default( $values, $site, $sitePath, $siteSubTree );
	}


	/**
	 * Returns the search results for the given SQL statement.
	 *
	 * @param MW_DB_Connection_Interface $conn Database connection
	 * @param $sql SQL statement
	 * @return MW_DB_Result_Interface Search result object
	 */
	protected function _getSearchResults( MW_DB_Connection_Interface $conn, $sql )
	{
		$stmt = $conn->create($sql);

		$this->_getContext()->getLogger()->log(__METHOD__ . ': SQL statement: ' . $stmt, MW_Logger_Abstract::DEBUG);

		return $stmt->execute();
	}


	/**
	 * Searches for all items matching the given critera.
	 *
	 * @param MW_Common_Criteria_Interface $search Criteria object with conditions, sortations, etc.
	 * @param integer &$total Number of items that are available in total
	 * @return array List of items implementing MShop_Common_Item_Interface
	 */
	protected function _search( MW_Common_Criteria_Interface $search, array $ref = array(), &$total = null )
	{
		$context = $this->_getContext();
		$config = $context->getConfig();

		$dbm = $context->getDatabaseManager();
		$dbname = $this->_getResourceName();
		$conn = $dbm->acquire( $dbname );

		$items = array();

		try
		{
			$attributes = $this->getSearchAttributes();
			$types = $this->_getSearchTypes($attributes);
			$translations = $this->_getSearchTranslations($attributes);

			$find = array( ':cond', ':order', ':start', ':size' );
			$replace = array(
				$search->getConditionString($types, $translations),
				$search->getSortationString($types, $translations),
				$search->getSliceStart(),
				$search->getSliceSize(),
			);

			/** mshop/locale/manager/default/item/search
			 * Retrieves the records matched by the given criteria in the database
			 *
			 * Fetches the records matched by the given criteria from the locale
			 * database. The records must be from one of the sites that are
			 * configured via the context item. If the current site is part of
			 * a tree of sites, the SELECT statement can retrieve all records
			 * from the current site and the complete sub-tree of sites.
			 *
			 * To limit the records matched, conditions can be added to the given
			 * criteria object. It can contain comparisons like column names that
			 * must match specific values which can be combined by AND, OR or NOT
			 * operators. The resulting string of SQL conditions replaces the
			 * ":cond" placeholder before the statement is sent to the database
			 * server.
			 *
			 * If the records that are retrieved should be ordered by one or more
			 * columns, the generated string of column / sort direction pairs
			 * replaces the ":order" placeholder. In case no ordering is required,
			 * the complete ORDER BY part including the "\/*-orderby*\/...\/*orderby-*\/"
			 * markers is removed to speed up retrieving the records. Columns of
			 * sub-managers can also be used for ordering the result set but then
			 * no index can be used.
			 *
			 * The number of returned records can be limited and can start at any
			 * number between the begining and the end of the result set. For that
			 * the ":size" and ":start" placeholders are replaced by the
			 * corresponding values from the criteria object. The default values
			 * are 0 for the start and 100 for the size value.
			 *
			 * The SQL statement should conform to the ANSI standard to be
			 * compatible with most relational database systems. This also
			 * includes using double quotes for table and column names.
			 *
			 * @param string SQL statement for searching items
			 * @since 2014.03
			 * @category Developer
			 * @see mshop/locale/manager/default/item/insert
			 * @see mshop/locale/manager/default/item/update
			 * @see mshop/locale/manager/default/item/newid
			 * @see mshop/locale/manager/default/item/delete
			 * @see mshop/locale/manager/default/item/count
			 */
			$path = 'mshop/locale/manager/default/item/search';

			$sql = $config->get($path, $path);
			$results = $this->_getSearchResults($conn, str_replace($find, $replace, $sql));

			try
			{
				while ( ( $row = $results->fetch() ) !== false ) {
					$items[ $row['id'] ] = $row;
				}
			}
			catch( Exception $e )
			{
				$results->finish();
				throw $e;
			}

			if ( $total !== null )
			{
				/** mshop/locale/manager/default/item/count
				 * Counts the number of records matched by the given criteria in the database
				 *
				 * Counts all records matched by the given criteria from the locale
				 * database. The records must be from one of the sites that are
				 * configured via the context item. If the current site is part of
				 * a tree of sites, the statement can count all records from the
				 * current site and the complete sub-tree of sites.
				 *
				 * To limit the records matched, conditions can be added to the given
				 * criteria object. It can contain comparisons like column names that
				 * must match specific values which can be combined by AND, OR or NOT
				 * operators. The resulting string of SQL conditions replaces the
				 * ":cond" placeholder before the statement is sent to the database
				 * server.
				 *
				 * Both, the strings for ":joins" and for ":cond" are the same as for
				 * the "search" SQL statement.
				 *
				 * Contrary to the "search" statement, it doesn't return any records
				 * but instead the number of records that have been found. As counting
				 * thousands of records can be a long running task, the maximum number
				 * of counted records is limited for performance reasons.
				 *
				 * The SQL statement should conform to the ANSI standard to be
				 * compatible with most relational database systems. This also
				 * includes using double quotes for table and column names.
				 *
				 * @param string SQL statement for counting items
				 * @since 2014.03
				 * @category Developer
				 * @see mshop/locale/manager/default/item/insert
				 * @see mshop/locale/manager/default/item/update
				 * @see mshop/locale/manager/default/item/newid
				 * @see mshop/locale/manager/default/item/delete
				 * @see mshop/locale/manager/default/item/search
				 */
				$path = 'mshop/locale/manager/default/item/count';

				$sql = $config->get($path, $path);
				$results = $this->_getSearchResults($conn, str_replace($find, $replace, $sql));

				$row = $results->fetch();
				$results->finish();

				if ( $row === false ) {
					throw new MShop_Locale_Exception( sprintf( 'Total results value not found' ) );
				}

				$total = $row['count'];
			}

			$dbm->release( $conn, $dbname );
		}
		catch ( Exception $e )
		{
			$dbm->release( $conn, $dbname );
			throw $e;
		}

		return $items;
	}
}