--- /dev/null
+<?php
+
+namespace Drupal\embed\EmbedType;
+
+use Drupal\Component\Utility\NestedArray;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Plugin\PluginBase;
+
+/**
+ * Defines a base implementation that most embed type plugins will extend.
+ *
+ * @ingroup embed_api
+ */
+abstract class EmbedTypeBase extends PluginBase implements EmbedTypeInterface {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function __construct(array $configuration, $plugin_id, $plugin_definition) {
+ parent::__construct($configuration, $plugin_id, $plugin_definition);
+ $this->configuration = NestedArray::mergeDeep($this->defaultConfiguration(), $this->configuration);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function calculateDependencies() {
+ return [];
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function defaultConfiguration() {
+ return [];
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getConfiguration() {
+ return $this->configuration;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getConfigurationValue($name, $default = NULL) {
+ $configuration = $this->getConfiguration();
+ if (array_key_exists($name, $configuration)) {
+ return $configuration[$name];
+ }
+ else {
+ return $default;
+ }
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setConfiguration(array $configuration) {
+ $this->configuration = $configuration;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setConfigurationValue($name, $value) {
+ $this->configuration[$name] = $value;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
+ return $form;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function validateConfigurationForm(array &$form, FormStateInterface $form_state) {
+ // Do nothing.
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
+ if (!$form_state->hasAnyErrors()) {
+ $this->setConfiguration(
+ array_intersect_key(
+ $form_state->getValues(),
+ $this->defaultConfiguration()
+ )
+ );
+ }
+ }
+
+}