| /* |
| * 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.jackrabbit.oak.commons; |
| |
| import java.util.Date; |
| |
| public final class LongUtils { |
| |
| private LongUtils() {} |
| |
| /** |
| * Sums {@code a} and {@code b} and verifies that it doesn't overflow in |
| * signed long arithmetic, in which case {@link Long#MAX_VALUE} will be |
| * returned instead of the result. |
| * |
| * Note: this method is a variant of {@link com.google.common.math.LongMath#checkedAdd(long, long)} |
| * that returns {@link Long#MAX_VALUE} instead of throwing {@code ArithmeticException}. |
| * |
| * @see com.google.common.math.LongMath#checkedAdd(long, long) |
| */ |
| public static long safeAdd(long a, long b) { |
| long result = a + b; |
| if ((a ^ b) < 0 | (a ^ result) >= 0) { |
| return result; |
| } else { |
| return Long.MAX_VALUE; |
| } |
| } |
| |
| /** |
| * Calculate an expiration time based on {@code new Date().getTime()} and |
| * the specified {@code expiration} in number of milliseconds. |
| * |
| * @param expiration The expiration in milliseconds. |
| * @return The expiration time. |
| */ |
| public static long calculateExpirationTime(long expiration) { |
| return LongUtils.safeAdd(expiration, new Date().getTime()); |
| } |
| } |