class IntegerItem

class IntegerItem extends NumericItemBase {
    
    /**
     * {@inheritdoc}
     */
    public static function defaultStorageSettings() {
        return [
            'unsigned' => FALSE,
            // Valid size property values include: 'tiny', 'small', 'medium', 'normal'
            // and 'big'.
'size' => 'normal',
        ] + parent::defaultStorageSettings();
    }
    
    /**
     * {@inheritdoc}
     */
    public static function defaultFieldSettings() {
        return [
            'min' => '',
            'max' => '',
            'prefix' => '',
            'suffix' => '',
        ] + parent::defaultFieldSettings();
    }
    
    /**
     * {@inheritdoc}
     */
    public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition) {
        $properties['value'] = DataDefinition::create('integer')->setLabel(new TranslatableMarkup('Integer value'))
            ->setRequired(TRUE);
        return $properties;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getConstraints() {
        $constraints = parent::getConstraints();
        // If this is an unsigned integer, add a validation constraint for the
        // integer to be positive.
        if ($this->getSetting('unsigned')) {
            $constraint_manager = \Drupal::typedDataManager()->getValidationConstraintManager();
            $constraints[] = $constraint_manager->create('ComplexData', [
                'value' => [
                    'Range' => [
                        'min' => 0,
                        'minMessage' => $this->t('%name: The integer must be larger or equal to %min.', [
                            '%name' => $this->getFieldDefinition()
                                ->getLabel(),
                            '%min' => 0,
                        ]),
                    ],
                ],
            ]);
        }
        return $constraints;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function schema(FieldStorageDefinitionInterface $field_definition) {
        return [
            'columns' => [
                'value' => [
                    'type' => 'int',
                    // Expose the 'unsigned' setting in the field item schema.
'unsigned' => $field_definition->getSetting('unsigned'),
                    // Expose the 'size' setting in the field item schema. For instance,
                    // supply 'big' as a value to produce a 'bigint' type.
'size' => $field_definition->getSetting('size'),
                ],
            ],
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public static function generateSampleValue(FieldDefinitionInterface $field_definition) {
        $min = $field_definition->getSetting('min') ?: 0;
        $max = $field_definition->getSetting('max') ?: 999;
        $values['value'] = mt_rand($min, $max);
        return $values;
    }

}