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<?php

/*
 * This file is part of the symfony framework.
 *
 * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

/**
 * sfServiceContainerBuilder is a DI container that provides an interface to build the services.
 *
 * @package    symfony
 * @subpackage dependency_injection
 * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
 * @version    SVN: $Id: sfServiceContainerBuilder.php 269 2009-03-26 20:39:16Z fabien $
 */
class sfServiceContainerBuilder extends sfServiceContainer
{
  protected
    $definitions = array(),
    $aliases     = array(),
    $loading     = array();

/**
   * Sets a service.
   *
   * @param string $id      The service identifier
   * @param object $service The service instance
   */
  public function setService($id, $service)
  {
    unset($this->aliases[$id]);

parent::setService($id, $service);
  }

/**
   * Returns true if the given service is defined.
   *
   * @param  string  $id      The service identifier
   *
   * @return Boolean true if the service is defined, false otherwise
   */
  public function hasService($id)
  {
    return isset($this->definitions[$id]) || isset($this->aliases[$id]) || parent::hasService($id);
  }

/**
   * Gets a service.
   *
   * @param  string $id The service identifier
   *
   * @return object The associated service
   *
   * @throw InvalidArgumentException if the service is not defined
   * @throw LogicException if the service has a circular reference to itself
   */
  public function getService($id)
  {
    try
    {
      return parent::getService($id);
    }
    catch (InvalidArgumentException $e)
    {
      if (isset($this->loading[$id]))
      {
        throw new LogicException(sprintf('The service "%s" has a circular reference to itself.', $id));
      }

if (!$this->hasServiceDefinition($id) && isset($this->aliases[$id]))
      {
        return $this->getService($this->aliases[$id]);
      }

$definition = $this->getServiceDefinition($id);
      $this->loading[$id] = true;

if ($definition->isShared())
      {
        $service = $this->services[$id] = $this->createService($definition);
      }
      else
      {
        $service = $this->createService($definition);
      }

unset($this->loading[$id]);

return $service;
    }
  }

/**
   * Gets all service ids.
   *
   * @return array An array of all defined service ids
   */
  public function getServiceIds()
  {
    return array_unique(array_merge(array_keys($this->getServiceDefinitions()), array_keys($this->aliases), parent::getServiceIds()));
  }

/**
   * Sets an alias for an existing service.
   *
   * @param string $alias The alias to create
   * @param string $id    The service to alias
   */
  public function setAlias($alias, $id)
  {
    $this->aliases[$alias] = $id;
  }

/**
   * Gets all defined aliases.
   *
   * @return array An array of aliases
   */
  public function getAliases()
  {
    return $this->aliases;
  }

/**
   * Registers a service definition.
   *
   * This methods allows for simple registration of service definition
   * with a fluid interface.
   *
   * @param  string $id    The service identifier
   * @param  string $class The service class
   *
   * @return sfServiceDefinition A sfServiceDefinition instance
   */
  public function register($id, $class)
  {
    return $this->setServiceDefinition($id, new sfServiceDefinition($class));
  }

/**
   * Adds the service definitions.
   *
   * @param array $definitions An array of service definitions
   */
  public function addServiceDefinitions(array $definitions)
  {
    foreach ($definitions as $id => $definition)
    {
      $this->setServiceDefinition($id, $definition);
    }
  }

/**
   * Sets the service definitions.
   *
   * @param array $definitions An array of service definitions
   */
  public function setServiceDefinitions(array $definitions)
  {
    $this->definitions = array();
    $this->addServiceDefinitions($definitions);
  }

/**
   * Gets all service definitions.
   *
   * @return array An array of sfServiceDefinition instances
   */
  public function getServiceDefinitions()
  {
    return $this->definitions;
  }

/**
   * Sets a service definition.
   *
   * @param  string              $id         The service identifier
   * @param  sfServiceDefinition $definition A sfServiceDefinition instance
   */
  public function setServiceDefinition($id, sfServiceDefinition $definition)
  {
    unset($this->aliases[$id]);

return $this->definitions[$id] = $definition;
  }

/**
   * Returns true if a service definition exists under the given identifier.
   *
   * @param  string  $id The service identifier
   *
   * @return Boolean true if the service definition exists, false otherwise
   */
  public function hasServiceDefinition($id)
  {
    return array_key_exists($id, $this->definitions);
  }

/**
   * Gets a service definition.
   *
   * @param  string  $id The service identifier
   *
   * @return sfServiceDefinition A sfServiceDefinition instance
   *
   * @throw InvalidArgumentException if the service definition does not exist
   */
  public function getServiceDefinition($id)
  {
    if (!$this->hasServiceDefinition($id))
    {
      //print_rr(array_keys($this->services)); 
      //print_rr($this->definitions); 
      //print_rre($this);
      //print_rre($id);
      throw new InvalidArgumentException(sprintf('The service definition "%s" does not exist.', $id));
    }

return $this->definitions[$id];
  }

/**
   * Creates a service for a service definition.
   *
   * @param  sfServiceDefinition $definition A service definition instance
   *
   * @return object              The service described by the service definition
   */
  protected function createService(sfServiceDefinition $definition)
  {
    if (null !== $definition->getFile())
    {
      require_once $this->resolveValue($definition->getFile());
    }

$r = new ReflectionClass($this->resolveValue($definition->getClass()));

$arguments = $this->resolveServices($this->resolveValue($definition->getArguments()));

if (null !== $definition->getConstructor())
    {
      $service = call_user_func_array(array($this->resolveValue($definition->getClass()), $definition->getConstructor()), $arguments);
    }
    else
    {
      $service = null === $r->getConstructor() ? $r->newInstance() : $r->newInstanceArgs($arguments);
    }

foreach ($definition->getMethodCalls() as $call)
    {
      call_user_func_array(array($service, $call[0]), $this->resolveServices($this->resolveValue($call[1])));
    }

if ($callable = $definition->getConfigurator())
    {
      if (is_array($callable) && is_object($callable[0]) && $callable[0] instanceof sfServiceReference)
      {
        $callable[0] = $this->getService((string) $callable[0]);
      }
      elseif (is_array($callable))
      {
        $callable[0] = $this->resolveValue($callable[0]);
      }

if (!is_callable($callable))
      {
        throw new InvalidArgumentException(sprintf('The configure callable for class "%s" is not a callable.', get_class($service)));
      }

call_user_func($callable, $service);
    }

return $service;
  }

/**
   * Replaces parameter placeholders (%name%) by their values.
   *
   * @param  mixed $value A value
   *
   * @return mixed The same value with all placeholders replaced by their values
   *
   * @throw RuntimeException if a placeholder references a parameter that does not exist
   */
  public function resolveValue($value)
  {
    if (is_array($value))
    {
      $args = array();
      foreach ($value as $k => $v)
      {
        $args[$this->resolveValue($k)] = $this->resolveValue($v);
      }

$value = $args;
    }
    else if (is_string($value))
    {
      if (preg_match('/^%([^%]+)%$/', $value, $match))
      {
        // we do this to deal with non string values (boolean, integer, ...)
        // the preg_replace_callback converts them to strings
        if (!$this->hasParameter($name = strtolower($match[1])))
        {
          throw new RuntimeException(sprintf('The parameter "%s" must be defined.', $name));
        }

$value = $this->getParameter($name);
      }
      else
      {
        $value = str_replace('%%', '%', preg_replace_callback('/(?<!%)(%)([^%]+)\1/', array($this, 'replaceParameter'), $value));
      }
    }

return $value;
  }

/**
   * Replaces service references by the real service instance.
   *
   * @param  mixed $value A value
   *
   * @return mixed The same value with all service references replaced by the real service instances
   */
  public function resolveServices($value)
  {
    if (is_array($value))
    {
      $value = array_map(array($this, 'resolveServices'), $value);
    }
    else if (is_object($value) && $value instanceof sfServiceReference)
    {
      $value = $this->getService((string) $value);
    }

return $value;
  }

protected function replaceParameter($match)
  {
    if (!$this->hasParameter($name = strtolower($match[2])))
    {
      throw new RuntimeException(sprintf('The parameter "%s" must be defined.', $name));
    }

return $this->getParameter($name);
  }
}

Editing: sfServiceContainerBuilder.php

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