1 /* 2 * Copyright (C) 2010 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.util.concurrent; 18 19 import java.util.concurrent.atomic.AtomicReference; 20 import java.util.concurrent.atomic.AtomicReferenceArray; 21 22 import javax.annotation.Nullable; 23 24 /** 25 * Static utility methods pertaining to classes in the 26 * {@code java.util.concurrent.atomic} package. 27 * 28 * @author Kurt Alfred Kluever 29 * @since 10.0 30 */ 31 public final class Atomics { 32 private Atomics() {} 33 34 /** 35 * Creates an {@code AtomicReference} instance with no initial value. 36 * 37 * @return a new {@code AtomicReference} with no initial value 38 */ 39 public static <V> AtomicReference<V> newReference() { 40 return new AtomicReference<V>(); 41 } 42 43 /** 44 * Creates an {@code AtomicReference} instance with the given initial value. 45 * 46 * @param initialValue the initial value 47 * @return a new {@code AtomicReference} with the given initial value 48 */ 49 public static <V> AtomicReference<V> newReference(@Nullable V initialValue) { 50 return new AtomicReference<V>(initialValue); 51 } 52 53 /** 54 * Creates an {@code AtomicReferenceArray} instance of given length. 55 * 56 * @param length the length of the array 57 * @return a new {@code AtomicReferenceArray} with the given length 58 */ 59 public static <E> AtomicReferenceArray<E> newReferenceArray(int length) { 60 return new AtomicReferenceArray<E>(length); 61 } 62 63 /** 64 * Creates an {@code AtomicReferenceArray} instance with the same length as, 65 * and all elements copied from, the given array. 66 * 67 * @param array the array to copy elements from 68 * @return a new {@code AtomicReferenceArray} copied from the given array 69 */ 70 public static <E> AtomicReferenceArray<E> newReferenceArray(E[] array) { 71 return new AtomicReferenceArray<E>(array); 72 } 73 } 74
