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.build;
19
20 import org.apache.commons.io.function.IOSupplier;
21
22 /**
23 * Abstracts supplying an instance of {@code T}. Use to implement the builder pattern.
24 *
25 * @param <T> the type of instances to build.
26 * @param <B> the type of builder subclass.
27 * @since 2.12.0
28 */
29 public abstract class AbstractSupplier<T, B extends AbstractSupplier<T, B>> implements IOSupplier<T> {
30
31 /**
32 * Returns this instance typed as the proper subclass type.
33 *
34 * @return this instance typed as the proper subclass type.
35 */
36 @SuppressWarnings("unchecked")
37 protected B asThis() {
38 return (B) this;
39 }
40
41 }