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<?php |
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/** |
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* Created by Vitaly Iegorov <[email protected]>. |
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* on 26.01.16 at 15:11 |
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*/ |
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namespace samsonframework\di; |
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use samsonframework\di\exception\ClassNotFoundException; |
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use samsonframework\di\exception\ConstructorParameterNotSetException; |
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class Container extends AbstractContainer |
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{ |
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/** Variable name for storing services */ |
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const STATIC_COLLECTION_VARIABLE = '$services'; |
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/** @var array[string] Collection of loaded services */ |
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protected $services = array(); |
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/** |
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* Get reflection parameter class name type hint if present without |
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* auto loading and throwing exceptions. |
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* TODO: Add resolving configured classes |
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* |
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* @param \ReflectionParameter $param Parameter for parsing |
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* |
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* @return string|null Class name typehint or null |
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*/ |
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protected function getClassName(\ReflectionParameter $param) |
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{ |
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preg_match('/\[\s\<\w+?>\s(?<class>[\w\\\\]+)/', (string)$param, $matches); |
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return array_key_exists('class', $matches) && $matches['class'] !== 'array' |
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? '\\' . ltrim($matches[1], '\\') |
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: null; |
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} |
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/** |
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* Recursively build class constructor dependencies tree. |
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* TODO: Analyze recurrent dependencies and throw an exception |
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* |
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* @param string $className Current class name for analyzing |
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* @param array $dependencies Reference to tree for filling up |
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* |
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* @return array [string] Multidimensional array as dependency tree |
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* @throws ClassNotFoundException |
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*/ |
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protected function buildDependenciesTree($className, array &$dependencies) |
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{ |
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// We need this class to exists to use reflections, it will try to autoload it also |
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if (class_exists($className)) { |
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$class = new \ReflectionClass($className); |
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// We can build dependency tree only from constructor dependencies |
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$constructor = $class->getConstructor(); |
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if (null !== $constructor) { |
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// Iterate all dependencies |
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foreach ($constructor->getParameters() as $parameter) { |
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// Ignore optional parameters |
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if (!$parameter->isOptional()) { |
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// Read dependency class name |
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$dependencyClass = $this->getClassName($parameter); |
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// Set pointer to parameter as it can be set before |
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$parameterPointer = &$dependencies[$className][$parameter->getName()]; |
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// If we have found dependency class |
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if ($dependencyClass !== null) { |
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// Point dependency class name |
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$parameterPointer = $dependencyClass; |
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// Go deeper in recursion and pass new branch there |
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$this->buildDependenciesTree($dependencyClass, $dependencies); |
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} |
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} else { // Stop iterating as first optional parameter is met |
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break; |
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} |
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} |
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} |
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} else { // Something went wrong and class is not auto loaded and missing |
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throw new ClassNotFoundException($className); |
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} |
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return $dependencies; |
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} |
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/** |
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* Set service dependency. Upon first creation of this class instance |
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* it would be used everywhere where this dependency is needed. |
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* |
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* @param string $className Fully qualified class name |
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* @param string $alias Dependency name |
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* @param array $parameters Collection of parameters needed for dependency creation |
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* |
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* @return Container Chaining |
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*/ |
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public function service($className, $alias = null, array $parameters = array()) |
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{ |
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$this->services[$className] = $className; |
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return $this->set($className, $alias, $parameters); |
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} |
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/** |
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* Set dependency. |
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* |
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* @param string $className Fully qualified class name |
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* @param string $alias Dependency name |
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* @param array $parameters Collection of parameters needed for dependency creation |
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* |
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* @return Container Chaining |
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*/ |
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public function set($className, $alias = null, array $parameters = array()) |
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{ |
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// Add this class dependencies to dependency tree |
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$this->dependencies = array_merge( |
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$this->dependencies, |
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$this->buildDependenciesTree($className, $this->dependencies) |
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); |
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// Merge other class constructor parameters |
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$this->dependencies[$className] = array_merge($this->dependencies[$className], $parameters); |
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// Store alias for this class name |
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$this->aliases[$alias] = $className; |
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} |
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/** |
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* Generate initial class instance declaration |
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* @param string $className Entity class name |
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*/ |
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protected function generateInitialDeclaration($className) |
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{ |
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if (array_key_exists($className, $this->services)) { |
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// Start service search or creation |
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$this->generator |
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->text('isset('.self::STATIC_COLLECTION_VARIABLE.'[\''.$className.'\'])') |
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->newLine('? '.self::STATIC_COLLECTION_VARIABLE.'[\''.$className.'\']') |
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->newLine(': '.self::STATIC_COLLECTION_VARIABLE.'[\''.$className.'\'] = new '.$className.'(') |
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->tabs++; |
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} else { |
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// Start object instance creation |
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$this->generator->text('new ' . $className . '(')->tabs++; |
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} |
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} |
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/** |
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* Generate container dependency condition code. |
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* |
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* @param string $className |
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* @param mixed $dependencies |
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* @param int $level |
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* |
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* @throws ConstructorParameterNotSetException |
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* |
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*/ |
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protected function generateCondition($className, $dependencies, $level = 0) |
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{ |
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$this->generator->newLine(($level === 0) ? 'return ' : ''); |
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$this->generateInitialDeclaration($className); |
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// Get last dependency variable name |
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end($dependencies); |
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$last = key($dependencies); |
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// Iterate all dependencies for this class |
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foreach ($dependencies as $variable => $dependency) { |
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// If dependency value is a string |
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if (is_string($dependency)) { |
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// Define if we have this dependency described in dependency tree |
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$dependencyPointer = &$this->dependencies[$dependency]; |
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if (null !== $dependencyPointer) { |
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// We have dependencies tree for this entity |
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$this->generateCondition($dependency, $dependencyPointer, $level + 1); |
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} elseif (class_exists($dependency, false)) { |
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// There are no dependencies for this entity |
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$this->generator->newLine('new ' . $dependency . '()'); |
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} else { // String variable |
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$this->generator->newLine()->stringValue($dependency); |
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} |
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} elseif (is_array($dependency)) { // Dependency value is array |
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$this->generator->newLine()->arrayValue($dependency); |
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} elseif ($dependency === null) { // Parameter is not set |
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throw new ConstructorParameterNotSetException($className . '::' . $variable); |
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} |
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// Add comma if this is not last dependency |
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if ($variable !== $last) { |
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$this->generator->text(','); |
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} |
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} |
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$this->generator->tabs--; |
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$this->generator->newLine(')' . ($level === 0 ? ';' : '')); |
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} |
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} |
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samsonframework /
di
