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DependencyContainer.php
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DependencyContainer.php
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<?php
namespace Solve\DependencyInjection;
use Solve\Storage\ArrayStorage;
/**
* Class DependencyContainer
* @package Solve\DependencyInjection
*
* Class DependencyContainer is a DI pattern realization
*
* @version 1.0
* @author Alexandr Viniychuk <alexandr.viniychuk@icloud.com>
*/
class DependencyContainer {
/**
* @var ArrayStorage
*/
private $_dependencies;
/**
* @var ArrayStorage
*/
private $_customArguments;
private static $_mainInstance;
public function __construct($initialDependencies = null) {
$this->_dependencies = new ArrayStorage();
$this->_customArguments = new ArrayStorage();
if (!empty($initialDependencies)) {
$this->addDependencies($initialDependencies);
}
}
public static function getMainInstance($initialDependencies = array()) {
if (empty(self::$_mainInstance)) {
self::$_mainInstance = new DependencyContainer($initialDependencies);
}
return self::$_mainInstance;
}
public function addDependencies($dependencies, $overwrite = true) {
foreach ($dependencies as $name => $dependencyInfo) {
if ($overwrite || !$this->hasDependency($name)) {
$this->add($name, $dependencyInfo['className'], $dependencyInfo);
}
}
}
/**
* Add dependency declaration to current container
*
* @param string $name
* @param mixed $dependencyUnit
* @param array $arguments
*/
public function add($name, $dependencyUnit, $arguments = array()) {
if (is_object($dependencyUnit)) {
$dependencyClass = get_class($dependencyUnit);
} else {
$dependencyClass = $dependencyUnit;
}
if (!is_array($arguments)) $arguments = array('arguments' => $arguments);
$this->_dependencies[$name] = array_merge($arguments, array(
'className' => $dependencyClass,
'object' => !empty($arguments['object']) ? $arguments['object'] : null
));
}
/**
* @param string $name
* @return mixed
* @throws \Exception
*/
public function get($name) {
$instance = null;
if ($this->_dependencies->offsetExists($name)) {
$this->initializeDependencyObject($name);
/** add reusability check */
$instance = $this->_dependencies[$name]['object'];
} else {
throw new \Exception('Invalid dependency unit requested: ' . $name);
}
return $instance;
}
public function getAllDependencies() {
return $this->_dependencies;
}
private function initializeDependencyObject($name) {
$params = $this->_dependencies[$name];
if (empty($params['object'])) {
$arguments = isset($params['arguments']) ? (is_array($params['arguments']) ? $params['arguments'] : array($params['arguments'])) : array();
if ($this->_customArguments->has($name)) {
$this->_customArguments->extendDeepValue($arguments, $name);
$arguments = $this->_customArguments->getDeepValue($name);
}
if (is_callable(array($params['className'], 'getInstance'))) {
$instance = call_user_func_array(array($params['className'], 'getInstance'), $arguments);
} else {
if (count($arguments)) {
if (count($arguments) > 1) {
$r = new \ReflectionClass($params['className']);
$instance = $r->newInstanceArgs($arguments);
} else {
$instance = new $params['className']($arguments[0]);
}
} else {
$instance = new $params['className']();
}
}
if ($instance instanceof DependencyUnit) {
$instance->setDependencyContainer($this);
}
$params['object'] = $instance;
}
$this->_dependencies[$name] = $params;
}
/**
* Check whether dependency has been already registered
* @param $name
* @return bool
*/
public function hasDependency($name) {
return $this->_dependencies->offsetExists($name);
}
public function setDependencyObject($name, $object) {
$this->_dependencies[$name]['object'] = $object;
return $this;
}
public function removeDependency($name) {
if ($this->hasDependency($name)) {
$this->_dependencies->offsetUnset($name);
}
return $this;
}
/**
*
* @param $name
* @param $argument
* @return DependencyContainer
*/
public function addDependencyArgument($name, $argument) {
if (!$this->_customArguments->offsetExists($name)) {
$this->_customArguments[$name] = array();
}
if (is_array($argument)) {
$this->_customArguments->extendDeepValue($argument, $name);
} else {
$this->_customArguments[$name][] = $argument;
}
return $this;
}
public function setDependencyArguments($name, $arguments) {
$this->_customArguments[$name] = $arguments;
return $this;
}
}