1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.commons.io.function;
19
20 import java.util.Objects;
21 import java.util.stream.BaseStream;
22
23 /**
24 * Abstracts an {@link IOBaseStream} implementation.
25 *
26 * Keep package-private for now.
27 *
28 * @param <T> the type of the stream elements.
29 * @param <S> the type of the stream extending {@code IOBaseStream}.
30 */
31 abstract class IOBaseStreamAdapter<T, S extends IOBaseStream<T, S, B>, B extends BaseStream<T, B>> implements IOBaseStream<T, S, B> {
32
33 /**
34 * The underlying base stream.
35 */
36 private final B delegate;
37
38 /**
39 * Constructs an instance.
40 *
41 * @param delegate the delegate.
42 */
43 IOBaseStreamAdapter(final B delegate) {
44 this.delegate = Objects.requireNonNull(delegate, "delegate");
45 }
46
47 @Override
48 public B unwrap() {
49 return delegate;
50 }
51
52 }