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File name : updateDependencies.php

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<?php
if (!defined('sugarEntry') || !sugarEntry) die('Not A Valid Entry Point');
/*********************************************************************************
 * SugarCRM Community Edition is a customer relationship management program developed by
 * SugarCRM, Inc. Copyright (C) 2004-2013 SugarCRM Inc.

* SuiteCRM is an extension to SugarCRM Community Edition developed by Salesagility Ltd.
 * Copyright (C) 2011 - 2016 Salesagility Ltd.
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License version 3 as published by the
 * Free Software Foundation with the addition of the following permission added
 * to Section 15 as permitted in Section 7(a): FOR ANY PART OF THE COVERED WORK
 * IN WHICH THE COPYRIGHT IS OWNED BY SUGARCRM, SUGARCRM DISCLAIMS THE WARRANTY
 * OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
 *
 * This program 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 Affero General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Affero General Public License along with
 * this program; if not, see http://www.gnu.org/licenses or write to the Free
 * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
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 * SW2-130, Cupertino, CA 95014, USA. or at email address contact@sugarcrm.com.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "Powered by
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 ********************************************************************************/

class updateDependencies {

function update_dependency(&$bean, $event, $arguments){
        //Get all tasks that are dependant on the current task being saved.
        $Task = BeanFactory::getBean('ProjectTask');
        $tasks = $Task->get_full_list("", "project_task.project_id = '".$bean->project_id."' AND project_task.predecessors = '".$bean->project_task_id."'");

if($bean->date_finish != $bean->fetched_row['date_finish']){ //if the end date of a current task is changed

$diff = $this->count_days($bean->date_finish, $bean->fetched_row['date_finish']); //Gets the difference in days

if($tasks) {
                foreach ($tasks as $task) { //loop through all dependant tasks

$rel_type = $task->relationship_type;//Determine their dependency type

if ($rel_type == 'FS') {//if its a Finish to start
                        //Modify the task's start and end date dependant on the difference in days
                        $start = new DateTime($task->date_start);
                        $start = $start->modify($diff);
                        $startdate = $start->format('Y-m-d');

$duration = $task->duration - 1;//take one off to maintain correct gantt bar length

$enddate = $start->modify('+' . $duration . ' days');
                        $enddate = $enddate->format('Y-m-d');

$task->date_start = $startdate;
                        $task->date_finish = $enddate;
                        $task->save();

} else if ($rel_type == 'SS') {//if its a start to start
                        //check if the tasks duration has not been changed so that it does not update when the parent tasks duration is changed
                        if ($bean->fetched_row['duration'] == $bean->duration) {

$start = new DateTime($task->date_start);
                            $start = $start->modify($diff);
                            $startdate = $start->format('Y-m-d');

$duration = $task->duration - 1;

$enddate = $start->modify('+' . $duration . ' days');
                            $enddate = $enddate->format('Y-m-d');

$task->date_start = $startdate;
                            $task->date_finish = $enddate;
                            $task->save();

}

}
            }

}
    }

//Gets the difference in days between two dates
    function count_days($start_date, $end_date){

$d1 = new DateTime($start_date);
        $d2 = new DateTime($end_date);
        $difference = $d1->diff($d2);
        if ($difference->invert == 1) {
            return '+'.$difference->d.' days'; //returns positive days
        } else {
            return -$difference->d.' days';//returns negative days
        }

}
}

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