| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.bval.util; |
| |
| import java.util.OptionalInt; |
| import java.util.function.IntSupplier; |
| |
| /** |
| * @since 2.0 |
| */ |
| public class LazyInt implements IntSupplier { |
| private int value; |
| private volatile IntSupplier init; |
| |
| public LazyInt(IntSupplier init) { |
| this.init = Validate.notNull(init); |
| } |
| |
| @Override |
| public int getAsInt() { |
| if (init != null) { |
| synchronized (this) { |
| if (init != null) { |
| value = init.getAsInt(); |
| init = null; |
| } |
| } |
| } |
| return value; |
| } |
| |
| public synchronized OptionalInt optional() { |
| return init == null ? OptionalInt.of(value) : OptionalInt.empty(); |
| } |
| } |