import static java.util.Objects.requireNonNull;
-import com.google.common.base.Function;
import com.google.common.base.Preconditions;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import java.util.Map.Entry;
import java.util.Optional;
import java.util.function.BiFunction;
+import java.util.function.Function;
import org.eclipse.jdt.annotation.NonNullByDefault;
import org.opendaylight.mdsal.binding.dom.codec.api.BindingCodecTree;
import org.opendaylight.mdsal.binding.dom.codec.api.BindingCodecTreeFactory;