001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.wicket.util; 018 019import java.util.function.Supplier; 020 021/** 022 * Provider that provides {@code null}s. Convenient to have to avoid a double {@code null} check for 023 * the provider and its provided instance. 024 * 025 * @author igor.vaynberg 026 * @param <T> 027 */ 028public class NullProvider<T> implements Supplier<T> 029{ 030 @Override 031 public T get() 032 { 033 return null; 034 } 035}