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/*
 * Copyright 2015 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;

public class NotAvailableAware {

    public static final int NA = -1;

    private NotAvailableAware() {}

    public static double add(double x, double y) {
        if (isNA(x)) {
            return y;
        }
        if (isNA(y)) {
            return x;
        }
        return x + y;
    }

    public static boolean isNA(double value) {
        return value == NA;
    }
}