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<?php

namespace mageekguy\atoum;

use
mageekguy\atoum\factory
;

class factory implements \arrayAccess, \serializable
{
protected $builders = array();
protected $importations = array();

private static $classes = array();

public function serialize()
{
return serialize($this->importations);
}

public function unserialize($string)
{
$this->importations = unserialize($string);

return $this;
}

public function offsetGet($class)
{
$builder = $this->getBuilder($class);

if ($builder === null)
{
$class = $this->resolveClass($class);

if (class_exists($class, true) === false)
{
throw new factory\exception('Class \'' . $class . '\' does not exist');
}

$this->setBuilder($class, $builder = function() use ($class) {
if (func_num_args() <= 0)
{
return new $class();
}
else
{
$class = new \reflectionClass($class);

return $class->newInstanceArgs(func_get_args());
}
}
);
}

return $builder;
}

public function offsetSet($class, $builder)
{
if ($builder instanceof \closure === false)
{
$builder = function() use ($builder) { return $builder; };
}

$this->setBuilder($class, $builder);
}

public function offsetUnset($class)
{
return $this->unsetBuilder($class);
}

public function offsetExists($class)
{
return $this->builderIsSet($class);
}

public function build($class, array $arguments = array())
{
return call_user_func_array($this[$class], $arguments);
}

public function setBuilder($class, $builder)
{
$this->builders[$this->resolveClass($class)] = $builder;

return $this;
}

public function builderIsSet($class)
{
return ($this->getBuilder($class) !== null);
}

public function getBuilder($class)
{
$builder = null;

if (sizeof($this->builders) > 0)
{
$class = $this->resolveClass($class);

if (isset($this->builders[$class]) === true)
{
$builder = $this->builders[$class];
}
}

return $builder;
}

public function unsetBuilder($class)
{
if (sizeof($this->builders) > 0)
{
$class = $this->resolveClass($class);

if (isset($this->builders[$class]) === true)
{
unset($this->builders[$class]);
}
}

return $this;
}

public function returnWhenBuild($class, $value)
{
return $this->setBuilder($class, function() use ($value) { return $value; });
}

public function getBuilders()
{
return $this->builders;
}

public function import($string, $alias = null)
{
$string = trim($string, '\\');

if ($alias !== null)
{
$alias = trim($alias, '\\');
}
else if (($lastOccurence = strrpos($string, '\\')) === false)
{
$alias = $string;
}
else
{
$alias = substr($string, $lastOccurence + 1);
}

if (isset($this->importations[$alias]) === true && $this->importations[$alias] != $string)
{
throw new factory\exception('Unable to use \'' . $string . '\' as \'' . $alias . '\' because the name is already in use');
}
else
{
$this->importations[$alias] = $string;

return $this;
}
}

public function getImportations()
{
return $this->importations;
}

public function resetImportations()
{
$this->importations = array();

return $this;
}

protected function resolveClass($class)
{
if (($firstOccurrence = strpos($class, '\\')) === false || $firstOccurrence > 0)
{
if ($firstOccurrence === false)
{
$topLevelNamespace = $class;
}
else
{
$topLevelNamespace = substr($class, 0, $firstOccurrence);
}


if (isset($this->importations[$topLevelNamespace]) === true)
{
if ($firstOccurrence === false)
{
$class = $this->importations[$topLevelNamespace];
}
else
{
$class = $this->importations[$topLevelNamespace] . '\\' . substr($class, $firstOccurrence + 1);
}
}
}

return $class;
}
}
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