DisplayManager.php

<?php

namespace Drupal\phpunit_example;


/**
 * An example class to demonstrate unit testing.
 *
 * Think of this class as a class that collects DisplayInfoInterface
 * objects, because that's what it is. It also might go on to one day
 * display lists of info about these info objects.
 *
 * But it never will, because it's just an example class.
 *
 * Part of the PHPUnit Example module.
 *
 * @ingroup phpunit_example
 */
class DisplayManager {
    
    /**
     * DisplayInfoInterface items.
     *
     * @var array
     */
    protected $items;
    
    /**
     * Add a displayable item.
     *
     * @param DisplayInfoInterface $item
     *   The item to add.
     */
    public function addDisplayableItem(DisplayInfoInterface $item) {
        $this->items[$item->getDisplayName()] = $item;
    }
    
    /**
     * A count of how many items exist.
     *
     * @return int
     *   The number of items that exist.
     */
    public function countDisplayableItems() {
        return count($this->items);
    }
    
    /**
     * All displayable items.
     *
     * @return array
     *   The displayable items.
     */
    public function displayableItems() {
        return $this->items;
    }
    
    /**
     * Find an item by its name.
     *
     * @param string $name
     *   The name to find.
     *
     * @return DisplayInfoInterface|null
     *   The found item, or NULL if none is found.
     */
    public function item($name) {
        if (isset($this->items[$name])) {
            return $this->items[$name];
        }
        return NULL;
    }

}