AppStateESS/InternshipInventory

<?php
/**
 * This file is part of Internship Inventory.
 *
 * Internship Inventory is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.

 * Internship Inventory is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License version 3
 * along with Internship Inventory.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Copyright 2011-2018 Appalachian State University
 */

namespace Intern;

abstract class WorkflowTransition {
    const sourceState = ''; // Name of Source/Dest states
    const destState   = '';
    const actionName  = '';
    const sortIndex   = 5;

    protected $source;

    public function __construct(){

    }

    abstract function getAllowedPermissionList();

    /**
     * Determines if this transition is applicable to the given Internship. If not,
     * the transition will not be shown in the list of actions for the user.
     * NB: This is distinct from the allowed() method because a return value of false
     * from allowed() will show the action as a disabled (grey'd out) in the list of
     * actions.
     *
     * Returns true by default, unless overridden by a child class.
     *
     * @param Internship $i
     * @return boolean
     */
    public function isApplicable(Internship $i){
        return true; // Returns true by default
    }

    public function allowed(Internship $i)
    {
        $perms = $this->getAllowedPermissionList();

        foreach($perms as $p){
            if(\Current_User::allow('intern', $p)){
                return true;
            }
        }

        return false;
    }

    public function setSourceState(WorkflowState $state)
    {
        $this->source = $state;
    }

    public function onTransition(Internship $i)
    {
        // Do nothing by default.
    }

    public function doNotification(Internship $i, $note = null)
    {
        // Do nothing by default. Send notifications here.
    }

    public function checkRequiredFields(Internship $i)
    {
        // Do nothing by default.
        // Check for required data here before allowing internship to complete this transition.
    }

    public function getName()
    {
        return get_called_class();
    }

    public function getActionName()
    {
        $class = get_called_class();
        return $class::actionName;
    }

    public function getSourceState()
    {
        $class = get_called_class();
        return $class::sourceState;
    }

    public function getDestState()
    {
        $class = get_called_class();
        return $class::destState;
    }

    public function getSortIndex()
    {
        $class = get_called_class();
        return $class::sortIndex;
    }
}