@noinspection PhpIncludeInspection More...

Inheritance diagram for ilConditionalNode:

Collaboration diagram for ilConditionalNode:

Public Member Functions
	__construct (ilWorkflow $a_context)
	Default constructor. More...

	activate ()
	Activates the node. More...

	deactivate ()
	Deactivates the node. More...

	checkTransitionPreconditions ()
	Checks, if the preconditions of the node to transit are met. More...

	attemptTransition ()
	Attempts to transit the node. More...

	executeTransition ()
	Executes the 'then'-transition of the node. More...

	executeElseTransition ()
	Executes the 'else'-transition of the node. More...

	addEmitter (ilEmitter $emitter, $else_emitter=false)
	Adds an emitter to one of the lists attached to the node. More...

	addActivity (ilActivity $activity, $else_activity=false)
	Adds an activity to one of the lists attached to the node. More...

	setEvaluationExpression ($a_expression)

	notifyDetectorSatisfaction (ilDetector $detector)
	This method is called by detectors, that just switched to being satisfied. More...

	getActivities ($else=false)
	Returns all currently set activites. More...

	getEmitters ($else=false)
	Returns all currently set emitters. More...

Public Member Functions inherited from ilBaseNode
	addDetector (ilDetector $detector)
	Adds a detector to the list of detectors. More...

	getDetectors ()
	Returns all currently set detectors. More...

	addEmitter (ilEmitter $emitter)
	Adds an emitter to the list of emitters. More...

	getEmitters ()
	Returns all currently set emitters. More...

	addActivity (ilActivity $activity)
	Adds an activity to the list of activities. More...

	getActivities ()
	Returns all currently set activities. More...

	getContext ()
	Returns a reference to the parent workflow object. More...

	setName ($name)

	getName ()

	getRuntimeVars ()

	setRuntimeVars ($runtime_vars)

	getRuntimeVar ($name)

	setRuntimeVar ($name, $value)

	onActivate ()
	Method called on activation of the node. More...

	onDeactivate ()
	Method calles on deactivation of the node. More...

	isActive ()
	Returns the activation status of the node. More...

	attemptTransition ()

	checkTransitionPreconditions ()

	executeTransition ()

	activate ()

	deactivate ()

	notifyDetectorSatisfaction (ilDetector $detector)

	attemptTransition ()

	checkTransitionPreconditions ()

	executeTransition ()

	addDetector (ilDetector $detector)

	addEmitter (ilEmitter $emitter)

	addActivity (ilActivity $activity)

	activate ()

	deactivate ()

	onActivate ()

	onDeactivate ()

	notifyDetectorSatisfaction (ilDetector $detector)

	getDetectors ()

	getEmitters ()

	getRuntimeVars ()

	setRuntimeVars ($runtime_vars)

	getRuntimeVar ($name)

	setRuntimeVar ($name, $value)

	getContext ()
	This method returns the context of the element. More...

	setName ($name)

	getName ()

Private Member Functions
	executeActivities ()
	Executes all 'then'-activities attached to the node. More...

	executeElseActivities ()
	Exectes all 'else'-activities attached to the node. More...

	executeEmitters ()
	Executes all 'then'-emitters attached to the node. More...

	executeElseEmitters ()
	Executes all 'else'-emitters attached to the node. More...

Private Attributes
	$else_emitters

	$else_activities

	$evaluation_expression = "return true;"

Additional Inherited Members
Protected Attributes inherited from ilBaseNode
	$context

	$detectors

	$emitters

	$activities

	$active = false

	$name

	$runtime_vars

Detailed Description

@noinspection PhpIncludeInspection

Conditional node of the petri net based workflow engine.

The conditional node is a deciding node. It features a doubled set of emitters and activities. The new set is prefixed with 'else_'. In the core of it, a given piece of php code is executed that returns either true, false or null, telling the node which set is to be executed - if any. This takes advantage of create_function, which is just as evil as eval. Because of that, the configuration of the conditional node must not be made available to users/admins and the content which makes up the evaluation method has no business in the database as this may pose a severe risk. Put these code pieces into the workflow object and set it during workflow creation. Remember: I told you before. Alternatively, you can extend this class and pre-set a code, that takes parameters from ilSetting, ini-Files, water diviner... up to you. Keep in mind to check these parameters for type and where possible, avoid strings and/or types that allow larger code segments.

Author: Maximilian Becker mbeck.nosp@m.er@d.nosp@m.ataba.nosp@m.y.de

Version: $Id$

/

Definition at line 29 of file class.ilConditionalNode.php.

Constructor & Destructor Documentation

◆ __construct()

ilConditionalNode::__construct ( ilWorkflow $a_context )

Default constructor.

Parameters

ilWorkflow Reference to the parent workflow.

Definition at line 60 of file class.ilConditionalNode.php.

        {
                $this->context = $a_context;
                $this->detectors = array();
                $this->emitters = array();
                $this->else_emitters = array();
                $this->activities = array();
                $this->else_activities = array();
        }

Member Function Documentation

◆ activate()

ilConditionalNode::activate ( )

Activates the node.

Reimplemented from ilBaseNode.

Definition at line 73 of file class.ilConditionalNode.php.

        {
                $this->active = true;
                foreach($this->detectors as $detector)
                {
                        $detector->onActivate();
                }
                $this->onActivate();
                $this->attemptTransition();
        }

References attemptTransition(), and ilBaseNode\onActivate().

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◆ addActivity()

ilConditionalNode::addActivity	(	ilActivity	$activity,
			$else_activity = `false`
	)

Adds an activity to one of the lists attached to the node.

Parameters

ilActivity	$activity
boolean	$else_activity	True, if the activity should be an 'else'-activity.

Definition at line 254 of file class.ilConditionalNode.php.

        {
                if (!$else_activity)
                {
                        $this->activities[] = $activity;
                }
                else
                {
                        $this->else_activities[] = $activity;
                }
        }

◆ addEmitter()

ilConditionalNode::addEmitter	(	ilEmitter	$emitter,
			$else_emitter = `false`
	)

Adds an emitter to one of the lists attached to the node.

Parameters

ilEmitter	$emitter
boolean	$else_emitter	True, if the emitter should be an 'else'-emitter.

Definition at line 236 of file class.ilConditionalNode.php.

        {
                if (!$else_emitter)
                {
                        $this->emitters[] = $emitter;
                }
                else
                {
                        $this->else_emitters[] = $emitter;
                }
        }

◆ attemptTransition()

ilConditionalNode::attemptTransition ( )

Attempts to transit the node.

Basically, this checks for preconditions and transits, returning true or false if preconditions are not met, aka detectors are not fully satisfied.

Returns: boolean True, if transition succeeded.

Reimplemented from ilBaseNode.

Definition at line 133 of file class.ilConditionalNode.php.

        {
                $eval_function = create_function('$detectors', $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;
                }
        }

References executeElseTransition(), and executeTransition().

Referenced by activate(), and notifyDetectorSatisfaction().

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◆ checkTransitionPreconditions()

ilConditionalNode::checkTransitionPreconditions ( )

Checks, if the preconditions of the node to transit are met.

Please note, that in a conditional node, this means the node can transit to one or another outcome. This method only returns false, if the return value of the method is neither true nor false.

Returns: boolean True, if node is ready to transit.

Reimplemented from ilBaseNode.

Definition at line 106 of file class.ilConditionalNode.php.

        {
                $eval_function = create_function('$detectors', $this->evaluation_expression);
 
                if ($eval_function($this->detectors) === null)
                {
                        return false;
                }
 
                if ($eval_function($this->detectors) === true)
                {
                        return true;
                } 
                else
                {
                        return true;
                }
        }

◆ deactivate()

ilConditionalNode::deactivate ( )

Deactivates the node.

Reimplemented from ilBaseNode.

Definition at line 87 of file class.ilConditionalNode.php.

        {
                $this->active = false;
                foreach($this->detectors as $detector)
                {
                        $detector->onDeactivate();
                }
                $this->onDeactivate();
        }

References ilBaseNode\onDeactivate().

Referenced by executeElseTransition(), and executeTransition().

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◆ executeActivities()

ilConditionalNode::executeActivities ( )

private

Executes all 'then'-activities attached to the node.

Definition at line 157 of file class.ilConditionalNode.php.

        {
                if (count($this->activities) != 0)
                {
                        foreach ($this->activities as $activity)
                        {
                                $activity->execute();
                        }
                }
        }

Referenced by executeTransition().

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◆ executeElseActivities()

ilConditionalNode::executeElseActivities ( )

private

Exectes all 'else'-activities attached to the node.

Definition at line 171 of file class.ilConditionalNode.php.

        {
                if (count($this->else_activities) != 0)
                {
                        foreach ($this->else_activities as $activity)
                        {
                                $activity->execute();
                        }
                }
        }

Referenced by executeElseTransition().

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◆ executeElseEmitters()

ilConditionalNode::executeElseEmitters ( )

private

Executes all 'else'-emitters attached to the node.

Definition at line 199 of file class.ilConditionalNode.php.

        {
                if (count($this->else_emitters) != 0)
                {
                        foreach ($this->else_emitters as $emitter)
                        {
                                $emitter->emit();
                        }
                }
        }

Referenced by executeElseTransition().

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◆ executeElseTransition()

ilConditionalNode::executeElseTransition ( )

Executes the 'else'-transition of the node.

Definition at line 223 of file class.ilConditionalNode.php.

        {
                $this->deactivate();
                $this->executeElseActivities();
                $this->executeElseEmitters();
        }

References deactivate(), executeElseActivities(), and executeElseEmitters().

Referenced by attemptTransition().

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◆ executeEmitters()

ilConditionalNode::executeEmitters ( )

private

Executes all 'then'-emitters attached to the node.

Definition at line 185 of file class.ilConditionalNode.php.

        {
                if (count($this->emitters) != 0)
                {
                        foreach ($this->emitters as $emitter)
                        {
                                $emitter->emit();
                        }
                }
        }

Referenced by executeTransition().

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◆ executeTransition()

ilConditionalNode::executeTransition ( )

Executes the 'then'-transition of the node.

Reimplemented from ilBaseNode.

Definition at line 213 of file class.ilConditionalNode.php.

        {
                $this->deactivate();
                $this->executeActivities();
                $this->executeEmitters();
        }

References deactivate(), executeActivities(), and executeEmitters().

Referenced by attemptTransition().

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◆ getActivities()

ilConditionalNode::getActivities ( $else = false )

Returns all currently set activites.

Parameters

boolean $else True, if else activities should be returned.

Returns: Array Array with objects of ilActivity

Definition at line 329 of file class.ilConditionalNode.php.

        {
                if ($else)
                {
                        return $this->else_activities;
                }
 
                return $this->activities;
        }

References ilBaseNode\$activities, and $else_activities.

◆ getEmitters()

ilConditionalNode::getEmitters ( $else = false )

Returns all currently set emitters.

Parameters

boolean $else True, if else emitters should be returned.

Returns: Array Array with objects of ilEmitter

Definition at line 346 of file class.ilConditionalNode.php.

        {
                if ($else)
                {
                        return $this->else_emitters;
                }
 
                return $this->emitters;
        }

References $else_emitters, and ilBaseNode\$emitters.

◆ notifyDetectorSatisfaction()

ilConditionalNode::notifyDetectorSatisfaction ( ilDetector $detector )

This method is called by detectors, that just switched to being satisfied.

Parameters

ilDetector $detector ilDetector which is now satisfied.

Returns: mixed|void

Reimplemented from ilBaseNode.

Definition at line 314 of file class.ilConditionalNode.php.

        {
                if ($this->isActive())
                {
                        $this->attemptTransition();
                }
        }

References attemptTransition(), and ilBaseNode\isActive().

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◆ setEvaluationExpression()

ilConditionalNode::setEvaluationExpression ( $a_expression )

Definition at line 302 of file class.ilConditionalNode.php.

        {
                $this->evaluation_expression = $a_expression;
        }

Field Documentation

◆ $else_activities

ilConditionalNode::$else_activities

private

Definition at line 45 of file class.ilConditionalNode.php.

Referenced by getActivities().

◆ $else_emitters

ilConditionalNode::$else_emitters

private

Definition at line 37 of file class.ilConditionalNode.php.

Referenced by getEmitters().

◆ $evaluation_expression

ilConditionalNode::$evaluation_expression = "return true;"

private

Definition at line 53 of file class.ilConditionalNode.php.

The documentation for this class was generated from the following file:

Services/WorkflowEngine/classes/nodes/class.ilConditionalNode.php

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ activate()

◆ addActivity()

◆ addEmitter()

◆ attemptTransition()

◆ checkTransitionPreconditions()

◆ deactivate()

◆ executeActivities()

◆ executeElseActivities()

◆ executeElseEmitters()

◆ executeElseTransition()

◆ executeEmitters()

◆ executeTransition()

◆ getActivities()

◆ getEmitters()

◆ notifyDetectorSatisfaction()

◆ setEvaluationExpression()

Field Documentation

◆ $else_activities

◆ $else_emitters

◆ $evaluation_expression