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<?php

namespace League\Event;

trait EmitterAwareTrait
{
    /**
     * The emitter instance.
     *
     * @var EmitterInterface|null
     */
    protected $emitter;

    /**
     * Set the Emitter.
     *
     * @param EmitterInterface|null $emitter
     *
     * @return $this
     */
    public function setEmitter(EmitterInterface $emitter = null)
    {
        $this->emitter = $emitter;

        return $this;
    }

    /**
     * Get the Emitter.
     *
     * @return EmitterInterface
     */
    public function getEmitter()
    {
        if (! $this->emitter) {
            $this->emitter = new Emitter();
        }

        return $this->emitter;
    }
}