/*
 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
 *
 * 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.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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@@END_COPYRIGHT@@

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>

/* To be able to name the Java constants the same as the C constants without
   having the preprocessor rewrite those identifiers, add PREFIX_ to all
   identifiers matching a C constant. The PREFIX_ is filtered out in the
   makefile. */

@@START_HERE@@

package jdk.internal.net.rdma;
import java.net.SocketOption;
import java.net.StandardSocketOptions;
import java.net.ProtocolFamily;
import java.util.Map;
import java.util.HashMap;

class RdmaSocketOptionRegistry {

    private RdmaSocketOptionRegistry() { }

    private static class RegistryKey {
        private final SocketOption<?> name;
        private final ProtocolFamily family;
        RegistryKey(SocketOption<?> name, ProtocolFamily family) {
            this.name = name;
            this.family = family;
        }
        public int hashCode() {
            return name.hashCode() + family.hashCode();
        }
        public boolean equals(Object ob) {
            if (ob == null) return false;
            if (!(ob instanceof RegistryKey)) return false;
            RegistryKey other = (RegistryKey)ob;
            if (this.name != other.name) return false;
            if (this.family != other.family) return false;
            return true;
        }
    }

    private static class LazyInitialization {

        static final Map<RegistryKey,RdmaOptionKey> options = options();

        private static Map<RegistryKey,RdmaOptionKey> options() {
            Map<RegistryKey,RdmaOptionKey> map =
                new HashMap<RegistryKey,RdmaOptionKey>();
            map.put(new RegistryKey(StandardSocketOptions.PREFIX_SO_SNDBUF,
                RdmaNet.UNSPEC), new RdmaOptionKey(SOL_SOCKET, SO_SNDBUF));
            map.put(new RegistryKey(StandardSocketOptions.PREFIX_SO_RCVBUF,
                RdmaNet.UNSPEC), new RdmaOptionKey(SOL_SOCKET, SO_RCVBUF));
            map.put(new RegistryKey(StandardSocketOptions.PREFIX_SO_REUSEADDR,
                RdmaNet.UNSPEC), new RdmaOptionKey(SOL_SOCKET, SO_REUSEADDR));
            // IPPROTO_TCP is 6
            map.put(new RegistryKey(StandardSocketOptions.PREFIX_TCP_NODELAY,
                RdmaNet.UNSPEC), new RdmaOptionKey(6, TCP_NODELAY));
            return map;
        }
    }

    public static RdmaOptionKey findOption(SocketOption<?> name,
                                           ProtocolFamily family) {
        RegistryKey key = new RegistryKey(name, family);
        return LazyInitialization.options.get(key);
    }
}