block title getting

BlockBase.php

<?php
class BlockBase {
  /**
   * {@inheritdoc}
   */
  final public function getTitle() {
    // Override titles should supersede native title logic.
    if (isset($this->configuration['label'])) {
      // @todo tokenization?
    }
    else {
      return $this->doGetTitle();
    }
  }

  /**
   * Returns a title for the block based on some native block logic.
   *
   * This method is intended for overriding by subclasses in order to provide
   * their own logic for generating the block title.
   *
   * @see BlockBase::getTitle()
   *
   * @return string
   */
  protected function doGetTitle() {
    // @todo make this abstract instead
    return '';
  }
}