/*

 * Copyright (c) 2020, Red Hat, Inc.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

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package sun.net;

import java.net.SocketOption;

import java.util.Collections;

import java.util.HashSet;

import java.util.Set;

import static jdk.net.ExtendedSocketOptions.TCP_KEEPCOUNT;

import static jdk.net.ExtendedSocketOptions.TCP_KEEPIDLE;

import static jdk.net.ExtendedSocketOptions.TCP_KEEPINTERVAL;

public class ExtendedOptionsHelper {

    private static final boolean keepAliveOptSupported =

            ExtendedOptionsImpl.keepAliveOptionsSupported();

    private static final Set<SocketOption<?>> extendedOptions = options();

    private static Set<SocketOption<?>> options() {

        Set<SocketOption<?>> options = new HashSet<>();

        if (keepAliveOptSupported) {

            options.add(TCP_KEEPCOUNT);

            options.add(TCP_KEEPIDLE);

            options.add(TCP_KEEPINTERVAL);

        }

        return Collections.unmodifiableSet(options);

    }

    public static Set<SocketOption<?>> keepAliveOptions() {

        return extendedOptions;

    }

}