class.ilConditionalNode.php

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<?php
/* Copyright (c) 1998-2016 ILIAS open source, Extended GPL, see docs/LICENSE */
 
require_once './Services/WorkflowEngine/classes/nodes/class.ilBaseNode.php';
 
class ilConditionalNode extends ilBaseNode
{
    private $else_emitters;
 
    private $else_activities;
 
    private $evaluation_expression = "return true;";
 
    public function __construct(ilWorkflow $a_context)
    {
        $this->context = $a_context;
        $this->detectors = array();
        $this->emitters = array();
        $this->else_emitters = array();
        $this->activities = array();
        $this->else_activities = array();
    }
 
    public function activate()
    {
        $this->active = true;
        foreach ($this->detectors as $detector) {
            $detector->onActivate();
        }
        $this->onActivate();
        $this->attemptTransition();
    }
 
    public function deactivate()
    {
        $this->active = false;
        foreach ($this->detectors as $detector) {
            $detector->onDeactivate();
        }
        $this->onDeactivate();
    }
 
    public function checkTransitionPreconditions()
    {
        $eval_function = function ($detectors) {
            return eval($this->evaluation_expression);
        };
 
        if ($eval_function($this->detectors) === null) {
            return false;
        }
 
        if ($eval_function($this->detectors) === true) {
            return true;
        } else {
            return true;
        }
    }
 
    public function attemptTransition()
    {
        $eval_function = function ($detectors) {
            return eval($this->evaluation_expression);
        };
 
        if ($eval_function($this->detectors) === null) {
            return false;
        }
 
        if ($eval_function($this->detectors) === true) {
            $this->executeTransition();
            return true;
        } else {
            $this->executeElseTransition();
            return true;
        }
    }
 
    private function executeActivities()
    {
        if (count($this->activities) != 0) {
            foreach ($this->activities as $activity) {
                $activity->execute();
            }
        }
    }
 
    private function executeElseActivities()
    {
        if (count($this->else_activities) != 0) {
            foreach ($this->else_activities as $activity) {
                $activity->execute();
            }
        }
    }
 
    private function executeEmitters()
    {
        if (count($this->emitters) != 0) {
            foreach ($this->emitters as $emitter) {
                $emitter->emit();
            }
        }
    }
 
    private function executeElseEmitters()
    {
        if (count($this->else_emitters) != 0) {
            foreach ($this->else_emitters as $emitter) {
                $emitter->emit();
            }
        }
    }
 
    public function executeTransition()
    {
        $this->deactivate();
        $this->executeActivities();
        $this->executeEmitters();
    }
 
    public function executeElseTransition()
    {
        $this->deactivate();
        $this->executeElseActivities();
        $this->executeElseEmitters();
    }
 
    public function addEmitter(ilEmitter $emitter, $else_emitter = false)
    {
        if (!$else_emitter) {
            $this->emitters[] = $emitter;
        } else {
            $this->else_emitters[] = $emitter;
        }
    }
 
    public function addActivity(ilActivity $activity, $else_activity = false)
    {
        if (!$else_activity) {
            $this->activities[] = $activity;
        } else {
            $this->else_activities[] = $activity;
        }
    }
 
    public function setEvaluationExpression($a_expression)
    {
        $this->evaluation_expression = $a_expression;
    }
 
    public function notifyDetectorSatisfaction(ilDetector $detector)
    {
        if ($this->isActive()) {
            $this->attemptTransition();
        }
    }
 
    public function getActivities($else = false)
    {
        if ($else) {
            return $this->else_activities;
        }
 
        return $this->activities;
    }
 
    public function getEmitters($else = false)
    {
        if ($else) {
            return $this->else_emitters;
        }
 
        return $this->emitters;
    }
}