1 /* 2 * This file is part of the Heritrix web crawler (crawler.archive.org). 3 * 4 * Licensed to the Internet Archive (IA) by one or more individual 5 * contributors. 6 * 7 * The IA licenses this file to You under the Apache License, Version 2.0 8 * (the "License"); you may not use this file except in compliance with 9 * the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, software 14 * distributed under the License is distributed on an "AS IS" BASIS, 15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 * See the License for the specific language governing permissions and 17 * limitations under the License. 18 */ 19 package org.archive.util; 20 21 /*** 22 * Class for optionally providing one instance of the parameterized 23 * type. The one instance may be provided at construction, or by 24 * overriding get() in subclasses, may be created on demand. 25 * 26 * @param <V> 27 */ 28 public class Supplier<V> { 29 V instance; 30 31 public Supplier() { 32 super(); 33 } 34 35 public Supplier(V instance) { 36 super(); 37 this.instance = instance; 38 } 39 40 public V get() { 41 return instance; 42 } 43 }