code: /*
   * Copyright (c) 2019 the Eclipse Milo Authors
   *
   * This program and the accompanying materials are made
   * available under the terms of the Eclipse Public License 2.0
   * which is available at https://www.eclipse.org/legal/epl-2.0/
   *
   * SPDX-License-Identifier: EPL-2.0
   */
  
  package org.eclipse.milo.opcua.sdk.core.util;
  
  import java.util.Optional;
  import java.util.stream.Stream;
  
  public class StreamUtil {
  
      /**
       * Turns an Optional into a Stream of length zero or one depending upon whether a value is present.
       */
      @SuppressWarnings("OptionalUsedAsFieldOrParameterType")
      public static <T> Stream<T> opt2stream(Optional<T> opt) {
          return opt.map(Stream::of).orElseGet(Stream::empty);
      }
  
  }
  