Chris@4: <?php
Chris@4: 
Chris@4: namespace Drupal\{{ machine_name }}\Plugin\Validation\Constraint;
Chris@4: 
Chris@4: use Symfony\Component\Validator\Constraint;
Chris@4: use Symfony\Component\Validator\ConstraintValidator;
Chris@4: 
Chris@4: /**
Chris@4:  * Validates the {{ plugin_label }} constraint.
Chris@4:  */
Chris@4: class {{ class }}Validator extends ConstraintValidator {
Chris@4: 
Chris@4:   /**
Chris@4:    * {@inheritdoc}
Chris@4:    */
Chris@4: {% if input_type == 'entity' %}
Chris@4:   public function validate($entity, Constraint $constraint) {
Chris@4: 
Chris@4:     // @DCG Validate the entity here.
Chris@4:     if ($entity->label() == 'foo') {
Chris@4:       $this->context->buildViolation($constraint->errorMessage)
Chris@4:         // @DCG The path depends on entity type. It can be title, name, etc.
Chris@4:         ->atPath('title')
Chris@4:         ->addViolation();
Chris@4:     }
Chris@4: 
Chris@4:   }
Chris@4: {% elseif input_type == 'item_list' %}
Chris@4:   public function validate($items, Constraint $constraint) {
Chris@4: 
Chris@4:     foreach ($items as $delta => $item) {
Chris@4:       // @DCG Validate the item here.
Chris@4:       if ($item->value == 'foo') {
Chris@4:         $this->context->buildViolation($constraint->errorMessage)
Chris@4:           ->atPath($delta)
Chris@4:           ->addViolation();
Chris@4:       }
Chris@4:     }
Chris@4: 
Chris@4:   }
Chris@4: {% elseif input_type == 'item' %}
Chris@4:   public function validate($item, Constraint $constraint) {
Chris@4: 
Chris@4:     $value = $item->getValue()['value'];
Chris@4:     // @DCG Validate the value here.
Chris@4:     if ($value == 'foo') {
Chris@4:       $this->context->addViolation($constraint->errorMessage);
Chris@4:     }
Chris@4: 
Chris@4:   }
Chris@4: {% else %}
Chris@4:   public function validate($value, Constraint $constraint) {
Chris@4: 
Chris@4:     // @DCG Validate the value here.
Chris@4:     if ($value == 'foo') {
Chris@4:       $this->context->addViolation($constraint->errorMessage);
Chris@4:     }
Chris@4: 
Chris@4:   }
Chris@4: {% endif %}
Chris@4: 
Chris@4: }