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<?php |
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namespace izzum\statemachine\loader; |
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use izzum\statemachine\StateMachine; |
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use izzum\statemachine\Exception; |
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use izzum\statemachine\State; |
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use izzum\statemachine\utils\Utils; |
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use izzum\statemachine\Transition; |
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use izzum\statemachine\persistence\PDO; |
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/** |
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* LoaderArray supports configuration of a StateMachine by loading it from |
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* an array of Transition instances. |
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* |
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* The LoaderArray should always be the object that is used by other Loader |
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* implementations. |
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* This means other LoaderInterface implementations should delegate the loading |
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* to this class. You could implement the Loader interface and |
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* use object composition for the LoaderArray. |
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* |
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* |
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* A transition will be unique per StateMachine and is uniquely defined by the |
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* tuple of a starting state name and a destination state name. |
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* The data of the rule, command or the identity (===) of the states does not |
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* matter when a Transition is added to a StateMachine. The machine will react |
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* on a first come first serve basis. In short, just make sure your |
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* configuration data is ok. |
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* |
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* TRICKY: if multiple transitions share the same State object (for example as |
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* their origin/from state or their destination/to state) then at least make |
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* sure that those states share the exact same data. |
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* Ideally, they should point to the same State instance. |
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* Otherwise, transitions and states are actually stored on the statemachine |
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* on a first wins basis (the later transition/state instance is not stored). |
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* |
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* Transitions will be sorted before they are added to the machine based on |
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* if they contain a regex or not. All regex transitions will be added to |
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* the machine after the non-regex transitions have been added. |
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* |
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* |
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* |
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* @see Transitions |
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* @see State |
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* @see PDO |
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* @author Rolf Vreijdenberger |
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* |
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*/ |
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class LoaderArray implements Loader { |
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/** |
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* |
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* @var Transition[] |
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*/ |
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protected $transitions; |
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/** |
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* |
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* @param Transition[] $transitions |
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* the transitions to be loaded |
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*/ |
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public function __construct($transitions = array()) |
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{ |
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$this->transitions = array(); |
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foreach ($transitions as $transition) { |
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if (!is_a($transition, 'izzum\statemachine\Transition')) { |
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throw new Exception('Expected Transition (or a subclass), found something else: ' . get_class($transition), Exception::BAD_LOADERDATA); |
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} |
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$this->add($transition); |
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} |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function load(StateMachine $stateMachine) |
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{ |
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$count = 0; |
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$unsorted = $this->getTransitions(); |
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$has_regex = array(); |
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$has_no_regex = array(); |
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foreach ($unsorted as $transition) { |
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$to = $transition->getStateTo(); |
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$from = $transition->getStateFrom(); |
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//sort on regexes. they should come last in an automated loader like this |
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if ($from->isRegex() || $to->isRegex()) { |
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$has_regex [] = $transition; |
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} else { |
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$has_no_regex [] = $transition; |
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} |
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} |
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$sorted = array_merge($has_no_regex, $has_regex); |
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// add the sorted transitions. the transitions added will set the |
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// states (from/to) on the statemachine |
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foreach ($sorted as $transition) { |
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// when using transitions with 'regex' states, the statemachine will handle this for you. |
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$count += $stateMachine->addTransition($transition); |
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} |
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return $count; |
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} |
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/** |
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* add/overwrite a transition |
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* |
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* @param Transition $transition |
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*/ |
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public function add(Transition $transition) |
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{ |
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$this->transitions [$transition->getName()] = $transition; |
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} |
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/** |
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* This method will return the transitions instances with the correct |
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* references to each other. |
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* |
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* @return Transition[] |
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*/ |
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public function getTransitions() |
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{ |
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return $this->transitions; |
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} |
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/** |
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* counts the number of contained transitions. |
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* this is not the same as the possible amount of transitions added (because of regex transitions) |
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* |
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* @return int |
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*/ |
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public function count() |
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{ |
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return (int) count($this->transitions); |
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} |
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1 |
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public function toString() |
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{ |
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return get_class($this); |
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} |
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public function __toString() |
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{ |
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return $this->toString(); |
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} |
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} |
rolfvreijdenberger /
izzum-statemachine
