Java Stream Operation nullableStreamOf(Collection nullableCollection)

Description

nullable Stream Of

License

Open Source License

Declaration

public static <T> Stream<T> nullableStreamOf(Collection<T> nullableCollection) 

Method Source Code

//package com.java2s;
/**/*from  w ww  .  ja v a 2s . c o m*/
 * JBoss, Home of Professional Open Source.
 * Copyright 2014 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * Licensed 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.
 */

import java.util.Collection;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;

public class Main {
    public static <T> Stream<T> nullableStreamOf(Collection<T> nullableCollection) {
        if (nullableCollection == null) {
            return Stream.empty();
        }
        return nullableCollection.stream();
    }

    public static <T> Stream<T> nullableStreamOf(Iterable<T> nullableIterable) {
        if (nullableIterable == null || !nullableIterable.iterator().hasNext()) {
            return Stream.empty();
        }
        return StreamSupport.stream(nullableIterable.spliterator(), false);
    }
}

Related

1. mapElementsSizes(IntStream intStream)
2. maximum(final Stream stream)
3. maxLong(Stream stream)
4. maxStringLength(Stream stringStream)
5. mkString(Stream items, String prefix, String delimiter, String suffix)
6. ofType(Stream stream, Class type)
7. opt2stream(Optional opt)
8. optionalToStream(final Optional optional)
9. optionalToStream(Optional optional)