| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE |
| * file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file |
| * to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the |
| * License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on |
| * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations under the License. |
| */ |
| package org.apache.tuweni.io; |
| |
| import static java.util.Objects.requireNonNull; |
| |
| import java.io.OutputStream; |
| import java.io.PrintStream; |
| import java.util.Enumeration; |
| import java.util.Spliterator; |
| import java.util.Spliterators; |
| import java.util.function.Consumer; |
| import java.util.stream.Stream; |
| import java.util.stream.StreamSupport; |
| |
| /** |
| * Utilities for working with streams. |
| */ |
| public final class Streams { |
| private Streams() {} |
| |
| private static final PrintStream NULL_PRINT_STREAM = new PrintStream(NullOutputStream.INSTANCE); |
| |
| /** |
| * @return An {@link OutputStream} that discards all input. |
| */ |
| public static OutputStream nullOutputStream() { |
| return NullOutputStream.INSTANCE; |
| } |
| |
| /** |
| * @return A {@link PrintStream} that discards all input. |
| */ |
| public static PrintStream nullPrintStream() { |
| return NULL_PRINT_STREAM; |
| } |
| |
| /** |
| * Stream an {@link Enumeration}. |
| * |
| * @param enumeration The enumeration. |
| * @param <T> The type of objects in the enumeration. |
| * @return A stream over the enumeration. |
| */ |
| public static <T> Stream<T> enumerationStream(Enumeration<T> enumeration) { |
| requireNonNull(enumeration); |
| return StreamSupport.stream(new Spliterators.AbstractSpliterator<T>(Long.MAX_VALUE, Spliterator.ORDERED) { |
| @Override |
| public boolean tryAdvance(Consumer<? super T> action) { |
| if (enumeration.hasMoreElements()) { |
| action.accept(enumeration.nextElement()); |
| return true; |
| } |
| return false; |
| } |
| |
| @Override |
| public void forEachRemaining(Consumer<? super T> action) { |
| while (enumeration.hasMoreElements()) { |
| action.accept(enumeration.nextElement()); |
| } |
| } |
| }, false); |
| } |
| } |