Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\datetime;
Chris@0: 
Chris@0: use Drupal\datetime\Plugin\Field\FieldType\DateTimeItem;
Chris@0: use Drupal\Core\Datetime\DrupalDateTime;
Chris@0: use Drupal\Core\TypedData\DataDefinitionInterface;
Chris@0: use Drupal\Core\TypedData\TypedDataInterface;
Chris@0: use Drupal\Core\TypedData\TypedData;
Chris@0: 
Chris@0: /**
Chris@0:  * A computed property for dates of date time field items.
Chris@0:  *
Chris@0:  * Required settings (below the definition's 'settings' key) are:
Chris@0:  *  - date source: The date property containing the to be computed date.
Chris@0:  */
Chris@0: class DateTimeComputed extends TypedData {
Chris@0: 
Chris@0:   /**
Chris@0:    * Cached computed date.
Chris@0:    *
Chris@0:    * @var \DateTime|null
Chris@0:    */
Chris@0:   protected $date = NULL;
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function __construct(DataDefinitionInterface $definition, $name = NULL, TypedDataInterface $parent = NULL) {
Chris@0:     parent::__construct($definition, $name, $parent);
Chris@0:     if (!$definition->getSetting('date source')) {
Chris@0:       throw new \InvalidArgumentException("The definition's 'date source' key has to specify the name of the date property to be computed.");
Chris@0:     }
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function getValue($langcode = NULL) {
Chris@0:     if ($this->date !== NULL) {
Chris@0:       return $this->date;
Chris@0:     }
Chris@0: 
Chris@0:     /** @var \Drupal\Core\Field\FieldItemInterface $item */
Chris@0:     $item = $this->getParent();
Chris@0:     $value = $item->{($this->definition->getSetting('date source'))};
Chris@0: 
Chris@0:     $datetime_type = $item->getFieldDefinition()->getSetting('datetime_type');
Chris@0:     $storage_format = $datetime_type === DateTimeItem::DATETIME_TYPE_DATE ? DATETIME_DATE_STORAGE_FORMAT : DATETIME_DATETIME_STORAGE_FORMAT;
Chris@0:     try {
Chris@0:       $date = DrupalDateTime::createFromFormat($storage_format, $value, DATETIME_STORAGE_TIMEZONE);
Chris@0:       if ($date instanceof DrupalDateTime && !$date->hasErrors()) {
Chris@0:         $this->date = $date;
Chris@0:         // If the format did not include an explicit time portion, then the
Chris@0:         // time will be set from the current time instead. For consistency, we
Chris@0:         // set the time to 12:00:00 UTC for date-only fields. This is used so
Chris@0:         // that the local date portion is the same, across nearly all time
Chris@0:         // zones.
Chris@0:         // @see datetime_date_default_time()
Chris@0:         // @see http://php.net/manual/en/datetime.createfromformat.php
Chris@0:         // @todo Update comment and/or code per the chosen solution in
Chris@0:         //   https://www.drupal.org/node/2830094
Chris@0:         if ($datetime_type === DateTimeItem::DATETIME_TYPE_DATE) {
Chris@0:           $this->date->setTime(12, 0, 0);
Chris@0:         }
Chris@0:       }
Chris@0:     }
Chris@0:     catch (\Exception $e) {
Chris@0:       // @todo Handle this.
Chris@0:     }
Chris@0:     return $this->date;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function setValue($value, $notify = TRUE) {
Chris@0:     $this->date = $value;
Chris@0:     // Notify the parent of any changes.
Chris@0:     if ($notify && isset($this->parent)) {
Chris@0:       $this->parent->onChange($this->name);
Chris@0:     }
Chris@0:   }
Chris@0: 
Chris@0: }