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<?php
/**
* @version $Id$
* @package Koowa_Database
* @subpackage Behavior
* @copyright Copyright (C) 2007 - 2012 Johan Janssens. All rights reserved.
* @license GNU GPLv3 <http://www.gnu.org/licenses/gpl.html>
*/
/**
* Abstract Database Behavior
*
* @author Johan Janssens <johan@nooku.org>
* @package Koowa_Database
* @subpackage Behavior
*/
abstract class KDatabaseBehaviorAbstract extends KMixinAbstract implements KDatabaseBehaviorInterface
{
/**
* The behavior priority
*
* @var integer
*/
protected $_priority;
/**
* The service identifier
*
* @var KServiceIdentifier
*/
private $__service_identifier;
/**
* The service container
*
* @var KServiceInterface
*/
private $__service_container;
/**
* Constructor.
*
* @param object An optional KConfig object with configuration options
*/
public function __construct( KConfig $config = null)
{
//Set the service container
if(isset($config->service_container)) {
$this->__service_container = $config->service_container;
}
//Set the service identifier
if(isset($config->service_identifier)) {
$this->__service_identifier = $config->service_identifier;
}
parent::__construct($config);
$this->_priority = $config->priority;
//Automatically mixin the behavior with the mixer (table object)
if($config->auto_mixin) {
$this->mixin($this);
}
}
/**
* Initializes the options for the object
*
* Called from {@link __construct()} as a first step of object instantiation.
*
* @param object An optional KConfig object with configuration options
* @return void
*/
protected function _initialize(KConfig $config)
{
$config->append(array(
'priority' => KCommand::PRIORITY_NORMAL,
'auto_mixin' => false
));
parent::_initialize($config);
}
/**
* Get the priority of a behavior
*
* @return integer The command priority
*/
public function getPriority()
{
return $this->_priority;
}
/**
* Command handler
*
* This function transmlated the command name to a command handler function of
* the format '_beforeX[Command]' or '_afterX[Command]. Command handler
* functions should be declared protected.
*
* @param string The command name
* @param object The command context
* @return boolean Can return both true or false.
*/
final public function execute( $name, KCommandContext $context)
{
$identifier = clone $context->caller->getIdentifier();
$type = array_pop($identifier->path);
$parts = explode('.', $name);
$method = '_'.$parts[0].ucfirst($type).ucfirst($parts[1]);
if(method_exists($this, $method))
{
if($context->data instanceof KDatabaseRowInterface) {
$this->setMixer($context->data);
}
return $this->$method($context);
}
return true;
}
/**
* Saves the row or rowset in the database.
*
* This function specialises the KDatabaseRow or KDatabaseRowset save
* function and auto-disables the tables command chain to prevent recursive
* looping.
*
* @return KDatabaseRowAbstract or KDatabaseRowsetAbstract
* @see KDatabaseRow::save or KDatabaseRowset::save
*/
public function save()
{
$this->getTable()->getCommandChain()->disable();
$this->_mixer->save();
$this->getTable()->getCommandChain()->enable();
return $this->_mixer;
}
/**
* Deletes the row form the database.
*
* This function specialises the KDatabaseRow or KDatabaseRowset delete
* function and auto-disables the tables command chain to prevent recursive
* looping.
*
* @return KDatabaseRowAbstract
*/
public function delete()
{
$this->getTable()->getCommandChain()->disable();
$this->_mixer->delete();
$this->getTable()->getCommandChain()->enable();
return $this->_mixer;
}
/**
* Get an object handle
*
* This function only returns a valid handle if one or more command handler
* functions are defined. A commend handler function needs to follow the
* following format : '_afterX[Event]' or '_beforeX[Event]' to be
* recognised.
*
* @return string A string that is unique, or NULL
* @see execute()
*/
public function getHandle()
{
$methods = $this->getMethods();
foreach($methods as $method)
{
if(substr($method, 0, 7) == '_before' || substr($method, 0, 6) == '_after') {
return parent::getHandle();
}
}
return null;
}
/**
* Get the methods that are available for mixin based
*
* This function also dynamically adds a function of format is[Behavior]
* to allow client code to check if the behavior is callable.
*
* @param object The mixer requesting the mixable methods.
* @return array An array of methods
*/
public function getMixableMethods(KObject $mixer = null)
{
$methods = parent::getMixableMethods($mixer);
$methods[] = 'is'.ucfirst($this->getIdentifier()->name);
return array_diff($methods, array('execute', 'save', 'delete', 'getHandle', 'getPriority', 'getIdentifier', 'getService'));
}
/**
* Get an instance of a class based on a class identifier only creating it
* if it doesn't exist yet.
*
* @param string|object The class identifier or identifier object
* @param array An optional associative array of configuration settings.
* @throws KServiceServiceException
* @return object Return object on success, throws exception on failure
* @see KObjectServiceable
*/
final public function getService($identifier, array $config = array())
{
return $this->__service_container->get($identifier, $config);
}
/**
* Gets the service identifier.
*
* @return KServiceIdentifier
* @see KObjectServiceable
*/
final public function getIdentifier($identifier = null)
{
if(isset($identifier)) {
$result = $this->__service_container->getIdentifier($identifier);
} else {
$result = $this->__service_identifier;
}
return $result;
}
}
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