| // 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.impala.util; |
| |
| import com.google.common.math.LongMath; |
| |
| public class MathUtil { |
| |
| // Multiply two numbers. If the multiply would overflow, return either Long.MIN_VALUE |
| // (if a xor b is negative) or Long.MAX_VALUE otherwise. The overflow path is not |
| // optimised at all and may be somewhat slow. |
| public static long saturatingMultiply(long a, long b) { |
| try { |
| return LongMath.checkedMultiply(a, b); |
| } catch (ArithmeticException e) { |
| return a < 0 != b < 0 ? Long.MIN_VALUE : Long.MAX_VALUE; |
| } |
| } |
| |
| // Add two numbers. If the add would overflow, return either Long.MAX_VALUE if both are |
| // positive or Long.MIN_VALUE if both are negative. The overflow path is not optimised |
| // at all and may be somewhat slow. |
| public static long saturatingAdd(long a, long b) { |
| try { |
| return LongMath.checkedAdd(a, b); |
| } catch (ArithmeticException e) { |
| return a < 0 ? Long.MIN_VALUE : Long.MAX_VALUE; |
| } |
| } |
| } |