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<?php |
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/* |
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* This file is part of Pimple. |
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* |
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* Copyright (c) 2009 Fabien Potencier |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is furnished |
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* to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in all |
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* copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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* THE SOFTWARE. |
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*/ |
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namespace PimpleCopy\Pimple; |
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/** |
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* Container main class. |
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* |
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* @author Fabien Potencier |
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*/ |
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class Container implements \ArrayAccess |
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{ |
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private $values = array(); |
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private $factories; |
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private $protected; |
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private $frozen = array(); |
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private $raw = array(); |
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private $keys = array(); |
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/** |
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* Instantiate the container. |
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* |
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* Objects and parameters can be passed as argument to the constructor. |
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* |
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* @param array $values The parameters or objects. |
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*/ |
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public function __construct(array $values = array()) |
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{ |
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$this->factories = new \SplObjectStorage(); |
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$this->protected = new \SplObjectStorage(); |
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foreach ( $values as $key => $value ) { |
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$this->offsetSet($key, $value); |
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} |
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} |
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/** |
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* Sets a parameter or an object. |
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* |
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* Objects must be defined as Closures. |
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* |
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* Allowing any PHP callable leads to difficult to debug problems |
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* as function names (strings) are callable (creating a function with |
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* the same name as an existing parameter would break your container). |
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* |
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* @param string $id The unique identifier for the parameter or object. |
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* @param mixed $value The value of the parameter or a closure to define an object. |
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* |
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* @return void |
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* @throws \RuntimeException Prevent override of a frozen service. |
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*/ |
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public function offsetSet($id, $value) |
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{ |
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if ( isset($this->frozen[$id]) ) { |
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throw new \RuntimeException(sprintf('Cannot override frozen service "%s".', $id)); |
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} |
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$this->values[$id] = $value; |
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$this->keys[$id] = true; |
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} |
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/** |
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* Gets a parameter or an object. |
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* |
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* @param string $id The unique identifier for the parameter or object. |
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* |
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* @return mixed The value of the parameter or an object |
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* @throws \InvalidArgumentException If the identifier is not defined. |
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*/ |
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public function offsetGet($id) |
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{ |
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if ( !isset($this->keys[$id]) ) { |
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throw new \InvalidArgumentException(sprintf('Identifier "%s" is not defined.', $id)); |
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} |
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if ( isset($this->raw[$id]) |
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|| !is_object($this->values[$id]) |
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|| isset($this->protected[$this->values[$id]]) |
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|| !method_exists($this->values[$id], '__invoke') |
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) { |
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return $this->values[$id]; |
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} |
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if ( isset($this->factories[$this->values[$id]]) ) { |
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return $this->values[$id]($this); |
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} |
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$raw = $this->values[$id]; |
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$val = $this->values[$id] = $raw($this); |
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$this->raw[$id] = $raw; |
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$this->frozen[$id] = true; |
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return $val; |
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} |
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/** |
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* Checks if a parameter or an object is set. |
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* |
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* @param string $id The unique identifier for the parameter or object. |
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* |
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* @return boolean |
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*/ |
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public function offsetExists($id) |
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{ |
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return isset($this->keys[$id]); |
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} |
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/** |
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* Unsets a parameter or an object. |
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* |
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* @param string $id The unique identifier for the parameter or object. |
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* |
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* @return void |
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*/ |
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public function offsetUnset($id) |
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{ |
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if ( isset($this->keys[$id]) ) { |
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if ( is_object($this->values[$id]) ) { |
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unset($this->factories[$this->values[$id]], $this->protected[$this->values[$id]]); |
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} |
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unset($this->values[$id], $this->frozen[$id], $this->raw[$id], $this->keys[$id]); |
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} |
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} |
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/** |
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* Marks a callable as being a factory service. |
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* |
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* @param callable $callable A service definition to be used as a factory. |
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* |
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* @return callable The passed callable |
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* @throws \InvalidArgumentException Service definition has to be a closure of an invokable object. |
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*/ |
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public function factory($callable) |
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{ |
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if ( !method_exists($callable, '__invoke') ) { |
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throw new \InvalidArgumentException('Service definition is not a Closure or invokable object.'); |
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} |
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$this->factories->attach($callable); |
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return $callable; |
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} |
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/** |
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* Protects a callable from being interpreted as a service. |
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* |
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* This is useful when you want to store a callable as a parameter. |
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* |
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* @param callable $callable A callable to protect from being evaluated. |
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* |
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* @return callable The passed callable |
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* @throws \InvalidArgumentException Service definition has to be a closure of an invokable object. |
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*/ |
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public function protect($callable) |
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{ |
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if ( !method_exists($callable, '__invoke') ) { |
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throw new \InvalidArgumentException('Callable is not a Closure or invokable object.'); |
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} |
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$this->protected->attach($callable); |
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return $callable; |
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} |
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/** |
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* Gets a parameter or the closure defining an object. |
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* |
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* @param string $id The unique identifier for the parameter or object. |
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* |
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* @return mixed The value of the parameter or the closure defining an object |
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* @throws \InvalidArgumentException If the identifier is not defined. |
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*/ |
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public function raw($id) |
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{ |
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if ( !isset($this->keys[$id]) ) { |
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throw new \InvalidArgumentException(sprintf('Identifier "%s" is not defined.', $id)); |
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} |
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if ( isset($this->raw[$id]) ) { |
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return $this->raw[$id]; |
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} |
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return $this->values[$id]; |
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} |
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/** |
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* Extends an object definition. |
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* |
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* Useful when you want to extend an existing object definition, |
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* without necessarily loading that object. |
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* |
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* @param string $id The unique identifier for the object. |
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* @param callable $callable A service definition to extend the original. |
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* |
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* @return callable The wrapped callable |
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* @throws \InvalidArgumentException If the identifier is not defined or not a service definition. |
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*/ |
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public function extend($id, $callable) |
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{ |
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if ( !isset($this->keys[$id]) ) { |
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throw new \InvalidArgumentException(sprintf('Identifier "%s" is not defined.', $id)); |
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} |
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if ( !is_object($this->values[$id]) || !method_exists($this->values[$id], '__invoke') ) { |
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throw new \InvalidArgumentException(sprintf('Identifier "%s" does not contain an object definition.', $id)); |
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} |
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if ( !is_object($callable) || !method_exists($callable, '__invoke') ) { |
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throw new \InvalidArgumentException('Extension service definition is not a Closure or invokable object.'); |
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} |
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$factory = $this->values[$id]; |
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$extended = function ($c) use ($callable, $factory) { |
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return $callable($factory($c), $c); |
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}; |
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if ( isset($this->factories[$factory]) ) { |
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$this->factories->detach($factory); |
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$this->factories->attach($extended); |
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} |
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return $this[$id] = $extended; |
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} |
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/** |
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* Returns all defined value names. |
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* |
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* @return array An array of value names |
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*/ |
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public function keys() |
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{ |
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return array_keys($this->values); |
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} |
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/** |
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* Registers a service provider. |
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* |
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* @param ServiceProviderInterface $provider A ServiceProviderInterface instance. |
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* @param array $values An array of values that customizes the provider. |
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* |
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* @return static |
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*/ |
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public function register(ServiceProviderInterface $provider, array $values = array()) |
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{ |
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$provider->register($this); |
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foreach ( $values as $key => $value ) { |
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$this[$key] = $value; |
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} |
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return $this; |
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} |
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} |
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