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<?php if (! defined('ABSPATH')) exit; // Exit if accessed directly |
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/** |
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* Dependency Injector Container Class |
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* |
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*/ |
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interface HC3_IDic |
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{ |
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public function bind( $entity, $interface = NULL, $singleton = TRUE ); |
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public function make( $interface, $wrap = TRUE ); |
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} |
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|
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class HC3_Dic implements HC3_IDic |
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{ |
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protected $bind = array(); |
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protected $singletons = array(); |
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|
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public function __construct() |
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{ |
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$this->bind( $this, get_class($this) ); |
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} |
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|
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/** |
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* Binds a concrete implementation to the interface. |
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* The below is not true as of 2017/03/21, this chain implementation appeared to be mind breaking, so hard to follow |
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* If several implementations are bound to one interface, it will return the latest one added. |
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* Then in implementations code they can refer to their own interface, but their own implementation will |
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* be skipped to avoid circular reference. So it is used like a decorator chain, each implementation can |
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* refer to an optional parent object of their own interface. |
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* |
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* @param string|object $entity A class name or object that implements an interface. |
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* @param string $interface Optional. An interface to be implemented. If omitted, |
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* it will require loading the class file to analyze which |
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* may add an overhead. |
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* @param bool $singleton Optional. If true then makes the returning object a singleton. |
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* |
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* @return object|NULL |
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*/ |
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public function bind( $entity, $interface = NULL, $singleton = TRUE ) |
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{ |
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if( $interface === NULL ){ |
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$interface = is_object($entity) ? get_class($entity) : $entity; |
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|
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// $interfaces = class_implements( $interface ); |
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// echo "'$interface' IMPLEMENTS"; |
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// _print_r( $interfaces ); |
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// if( $interfaces ){ |
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// echo "'$interface' IMPLEMENTS "; |
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// $interface = array_shift( $interfaces ); |
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// echo "'$interface'<br>"; |
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// } |
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} |
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|
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$interface = strtolower( $interface ); |
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// if( is_object($entity) ) |
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// echo "BINDING '" . get_class($entity) . "' AS '" . $interface . "'<br>"; |
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// else |
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// echo "BINDING '" . $entity . "' AS '" . $interface . "'<br>"; |
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|
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// echo "int = '$interface'<br>"; |
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|
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if( ! is_object($entity) ){ |
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$entity = strtolower( $entity ); |
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} |
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|
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$this->bind[ $interface ] = $entity; |
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|
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if( $singleton ){ |
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$this->singletons[ $interface ] = $interface; |
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} |
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|
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return $this; |
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} |
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|
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/** |
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* Returns a concrete implementation of the interface with their dependencies injected in constructor. |
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* Dependencies can be either type-hinted by class/interface name like HC3_Module_ClassName $obj |
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* or var name hinted, the var name defines the class name, like this $HC3_Module_ClassName |
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Returns a concrete implementation of the interface with their dependencies injected in constructor. |
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* |
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* @return object|NULL A concrete implementation of the interface. |
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*/ |
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public function make( $interface, $wrap = TRUE ) |
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{ |
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$hooks = NULL; |
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if( array_key_exists('hc3_hooks', $this->bind) ){ |
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$hooks = $this->bind['hc3_hooks']; |
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} |
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else { |
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$wrap = FALSE; |
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} |
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if( 'hc3_hooks' == $interface ){ |
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$wrap = FALSE; |
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} |
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|
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$interface = strtolower( $interface ); |
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|
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// echo "WANT '$interface'<br>"; |
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// echo 'GOTSKIP'; |
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// _print_r( $skip ); |
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|
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// _print_r( array_keys($this->bind) ); |
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|
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$bind_index = 0; |
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// binded |
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if( array_key_exists($interface, $this->bind) ){ |
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// echo "INT '$interface' BOUND<br>"; |
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$thisone = $this->bind[$interface]; |
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|
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if( is_object($thisone) ){ |
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if( $wrap ){ |
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$return = $hooks->wrap($thisone); |
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return $return; |
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} |
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return $thisone; |
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} |
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else { |
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if( ! $thisone ){ |
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if( class_exists($interface) ){ |
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$thisone = $interface; |
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} |
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} |
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$classname = $thisone; |
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} |
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} |
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else { |
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$classname = $interface; |
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|
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// try to use a default implementation |
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// if( substr($classname, -1) == '_' ){ |
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// $classname = substr($classname, 0, -1); |
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// } |
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|
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$this->singletons[$interface] = $interface; |
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} |
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|
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// echo "REAL '$classname'<br>"; |
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// _print_r( $classname ); |
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if( ! strlen($classname) ){ |
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$return = NULL; |
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return $return; |
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} |
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|
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$class = new ReflectionClass( $classname ); |
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$constructor = $class->getConstructor(); |
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|
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$dependencies = array(); |
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|
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if( isset($constructor) ){ |
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$need_args = $constructor->getParameters(); |
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foreach( $need_args as $need_arg ){ |
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$is_optional = $need_arg->isOptional(); |
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$wrap_this = FALSE; |
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|
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$arg_name = $need_arg->getName(); |
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$arg_name = strtolower( $arg_name ); |
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|
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$need_classname = NULL; |
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|
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try { |
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if( method_exists($need_arg, 'getType') ){ |
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// $need_class = $need_arg->getType() && !$need_arg->getType()->isBuiltin() ? new ReflectionClass($need_arg->getType()->getName()) : NULL; |
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$argType = $need_arg->getType(); |
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if( (! $argType) OR $argType->isBuiltin() ){ |
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$argClass = NULL; |
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} |
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else { |
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if( method_exists($argType, 'getName') ){ |
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$argClassName = $argType->getName(); |
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} |
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else { |
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$argClassName = '' . $argType; |
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} |
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$argClass = new ReflectionClass( $argClassName ); |
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} |
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$need_class = $argClass; |
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} |
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else { |
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$need_class = $need_arg->getClass(); |
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} |
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} |
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catch( ReflectionException $e ){ |
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$need_class = NULL; |
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} |
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|
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if( $need_class ){ |
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$need_classname = $need_class->getName(); |
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} |
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|
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if( ! $need_class ){ |
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if( ! $is_optional ){ |
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$need_classname = $arg_name; |
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$wrap_this = TRUE; |
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// echo "NOW NEED CLASSNAME = '$need_classname'<br>"; |
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} |
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} |
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|
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if( $is_optional && (! $need_classname) ){ |
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continue; |
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} |
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|
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if( (! $need_classname) && (! $is_optional) ){ |
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echo "DIC: class/varname is unknown for '$arg_name' argument of '$classname'!<br>"; |
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exit; |
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} |
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|
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if( $need_classname ){ |
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$need_classname = strtolower( $need_classname ); |
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|
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if( ! array_key_exists($need_classname, $this->bind) ){ |
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// if( $is_optional ){ |
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// continue; |
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// } |
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// else { |
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// echo "DIC: class '$need_classname' is not registered while trying to use it as a dependency for '$classname'<br>"; |
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// exit; |
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// } |
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} |
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$dependencies[] = array( $need_classname, $wrap_this ); |
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} |
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} |
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} |
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|
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if( $dependencies ){ |
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$args = array(); |
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|
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foreach( $dependencies as $dep ){ |
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list( $dep, $wrap_this ) = $dep; |
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if( ! is_object($dep) ){ |
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$dep = $this->make($dep, $wrap_this); |
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} |
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$args[] = $dep; |
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} |
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$class = new ReflectionClass($classname); |
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$return = $class->newInstanceArgs($args); |
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} |
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else { |
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$return = new $classname; |
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} |
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|
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if( isset($this->singletons[$interface]) ){ |
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// echo 'REBIND ' . $interface . ' AS ' . get_class($return) . '<br>'; |
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// echo 'BIND INDEX = ' . $bind_index . '<br>'; |
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// _print_r( $this->bind[$interface] ); |
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// $this->bind( $return, $interface ); |
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$this->bind[ $interface ] = $return; |
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} |
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|
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if( $wrap ){ |
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$return = $hooks->wrap($return); |
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} |
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else { |
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// echo "NO WRAP FOR " . get_class($return) . "<br>\n"; |
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} |
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|
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return $return; |
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} |
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} |
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|
