class PluginBase

abstract class PluginBase implements PluginInspectionInterface, DerivativeInspectionInterface {
    
    /**
     * A string which is used to separate base plugin IDs from the derivative ID.
     */
    const DERIVATIVE_SEPARATOR = ':';
    
    /**
     * The plugin ID.
     *
     * @var string
     */
    protected $pluginId;
    
    /**
     * The plugin implementation definition.
     *
     * @var \Drupal\Component\Plugin\Definition\PluginDefinitionInterface|array
     */
    protected $pluginDefinition;
    
    /**
     * Configuration information passed into the plugin.
     *
     * When using an interface like
     * \Drupal\Component\Plugin\ConfigurableInterface, this is where the
     * configuration should be stored.
     *
     * Plugin configuration is optional, so plugin implementations must provide
     * their own setters and getters.
     *
     * @var array
     */
    protected $configuration;
    
    /**
     * Constructs a \Drupal\Component\Plugin\PluginBase object.
     *
     * @param array $configuration
     *   A configuration array containing information about the plugin instance.
     * @param string $plugin_id
     *   The plugin ID for the plugin instance.
     * @param mixed $plugin_definition
     *   The plugin implementation definition.
     */
    public function __construct(array $configuration, $plugin_id, $plugin_definition) {
        $this->configuration = $configuration;
        $this->pluginId = $plugin_id;
        $this->pluginDefinition = $plugin_definition;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getPluginId() {
        return $this->pluginId;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getBaseId() {
        $plugin_id = $this->getPluginId();
        if (strpos($plugin_id, static::DERIVATIVE_SEPARATOR)) {
            [
                $plugin_id,
            ] = explode(static::DERIVATIVE_SEPARATOR, $plugin_id, 2);
        }
        return $plugin_id;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDerivativeId() {
        $plugin_id = $this->getPluginId();
        $derivative_id = NULL;
        if (strpos($plugin_id, static::DERIVATIVE_SEPARATOR)) {
            [
                ,
                $derivative_id,
            ] = explode(static::DERIVATIVE_SEPARATOR, $plugin_id, 2);
        }
        return $derivative_id;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getPluginDefinition() {
        return $this->pluginDefinition;
    }
    
    /**
     * Determines if the plugin is configurable.
     *
     * @return bool
     *   A boolean indicating whether the plugin is configurable.
     */
    public function isConfigurable() {
        return $this instanceof ConfigurableInterface;
    }

}