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}