/* * Copyright 2015-2016 the original author or authors. * * Licensed 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.glowroot.common.util; import javax.annotation.Nullable; public class NotAvailableAware { public static final int NA = -1; private NotAvailableAware() {} public static double add(double x, double y) { if (isNA(x) || isNA(y)) { return NA; } return x + y; } public static long add(long x, long y) { if (isNA(x) || isNA(y)) { return NA; } return x + y; } public static boolean isNA(double value) { return value == NA; } public static boolean isNA(long value) { return value == NA; } public static @Nullable Double orNull(double value) { return value == NA ? null : value; } }