amespace are allowed." );
		}

		if ( ! array_key_exists( $class_name, $this->original_concretes ) ) {
			// LegacyProxy is a special case: we replace it with MockableLegacyProxy at unit testing bootstrap time.
			$original_concrete                       = LegacyProxy::class === $class_name ? MockableLegacyProxy::class : $this->extend( $class_name )->getConcrete( $concrete );
			$this->original_concretes[ $class_name ] = $original_concrete;
		}

		return $this->extend( $class_name )->setConcrete( $concrete );
	}

	/**
	 * Reset a replaced registration back to its original concrete.
	 *
	 * @param string $class_name The class name whose definition had been replaced.
	 * @return bool True if the registration has been reset, false if no replacement had been made for the specified class name.
	 */
	public function reset_replacement( string $class_name ) : bool {
		if ( ! array_key_exists( $class_name, $this->original_concretes ) ) {
			return false;
		}

		$this->extend( $class_name )->setConcrete( $this->original_concretes[ $class_name ] );
		unset( $this->original_concretes[ $class_name ] );

		return true;
	}

	/**
	 * Reset all the replaced registrations back to their original concretes.
	 */
	public function reset_all_replacements() {
		foreach ( $this->original_concretes as $class_name => $concrete ) {
			$this->extend( $class_name )->setConcrete( $concrete );
		}

		$this->original_concretes = array();
	}

	/**
	 * Reset all the cached resolutions, so any further "get" for shared definitions will generate the instance again.
	 */
	public function reset_all_resolved() {
		foreach ( $this->definitions->getIterator() as $definition ) {
			$definition->forgetResolved();
		}
	}

	/**
	 * Get an instance of a registered class.
	 *
	 * @param string $id The class name.
	 * @param bool   $new True to generate a new instance even if the class was registered as shared.
	 *
	 * @return object An instance of the requested class.
	 * @throws ContainerException Attempt to get an instance of a non-namespaced class.
	 */
	public function get( $id, bool $new = false ) {
		if ( false === strpos( $id, '\\' ) ) {
			throw new ContainerException( "Attempt to get an instance of the non-namespaced class '$id' from the container, did you forget to add a namespace import?" );
		}

		// This is a workaround for an issue that arises when using service providers inheriting from AbstractInterfaceServiceProvider:
		// if one of these providers registers classes both by name and by tag, and one of its registered classes is requested
		// with 'get' by name before a list of classes is requested by tag, then that service provider gets locked as
		// the only one providing that tag, and the others get ignored. This is due to the fact that container definitions
		// are created "on the fly" as needed and the base 'get' method won't try to register additional providers
		// if the requested tag is already provided by at least one of the already existing definitions.
		if ( $this->definitions->hasTag( $id ) && ! in_array( $id, $this->known_tags, true ) && $this->providers->provides( $id ) ) {
			$this->providers->register( $id );
			$this->known_tags[] = $id;
		}

		return parent::get( $id, $new );
	}

	/**
	 * Gets the class from the concrete regardless of type.
	 *
	 * @param mixed $concrete The concrete that we want the class from..
	 *
	 * @return string|null The class from the concrete if one is available, null otherwise.
	 */
	protected function get_class_from_concrete( $concrete ) {
		if ( is_object( $concrete ) && ! is_callable( $concrete ) ) {
			if ( $concrete instanceof DefinitionInterface ) {
				return $this->get_class_from_concrete( $concrete->getConcrete() );
			}

			return get_class( $concrete );
		}

		if ( is_string( $concrete ) && class_exists( $concrete ) ) {
			return $concrete;
		}

		return null;
	}

	/**
	 * Checks to see whether or not a class is allowed to be registered.
	 *
	 * @param string $class_name The class to check.
	 *
	 * @return bool True if the class is allowed to be registered, false otherwise.
	 */
	protected function is_class_allowed( string $class_name ): bool {
		return StringUtil::starts_with( $class_name, $this->woocommerce_namespace, false ) || in_array( $class_name, $this->registration_whitelist, true );
	}

	/**
	 * Check if a class name corresponds to an anonymous class.
	 *
	 * @param string $class_name The class name to check.
	 * @return bool True if the name corresponds to an anonymous class.
	 */
	protected function is_anonymous_class( string $class_name ): bool {
		return StringUtil::starts_with( $class_name, 'class@anonymous' );
	}
}