/*
* 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;
}
}