001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.camel.util; 018 019import java.util.Collection; 020import java.util.Map; 021import java.util.stream.Stream; 022 023public final class StreamUtils { 024 private StreamUtils() { 025 } 026 027 /** 028 * Creates a stream on the given collection if it is not null 029 * 030 * @param value the collection 031 * @return A stream of elements or an empty stream if the collection is null 032 */ 033 public static <C> Stream<C> stream(Collection<C> value) { 034 return value != null ? value.stream() : Stream.empty(); 035 } 036 037 /** 038 * Creates a stream of entries on the given Map if it is not null 039 * 040 * @param value the map 041 * @return A stream of entries or an empty stream if the collection is null 042 */ 043 public static <K, V> Stream<Map.Entry<K, V>> stream(Map<K, V> value) { 044 return value != null ? value.entrySet().stream() : Stream.empty(); 045 } 046}