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") asThis()37 protected B asThis() { 38 return (B) this; 39 } 40 41 } 42