Java example source code file (genSocketOptionRegistry.c)

This example Java source code file (genSocketOptionRegistry.c) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

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Java - Java tags/keywords

ip_multicast_ttl, ipproto_ip, ipproto_ipv6, ipproto_tcp, ipv6_multicast_hops, lazyinitialization, map, optionkey, protocolfamily, registrykey, so_oobinline, so_rcvbuf, socketoptionregistry, sol_socket

The genSocketOptionRegistry.c Java example source code

/*
 * Copyright (c) 2008, 2012, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

#include <stdio.h>
#ifdef _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#else
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#endif

/**
 * Generates sun.nio.ch.SocketOptionRegistry, a class that maps Java-level
 * socket options to the platform specific level and option.
 */

static void out(char* s) {
    printf("%s\n", s);
}

static void emit(const char *name, char * family, int level, int optname) {
    printf("            map.put(new RegistryKey(%s, %s),", name, family);
    printf(" new OptionKey(%d, %d));\n", level, optname);
}

static void emit_unspec(const char *name, int level, int optname) {
    emit(name, "Net.UNSPEC", level, optname);
}

static  void emit_inet(const char *name, int level, int optname) {
    emit(name, "StandardProtocolFamily.INET", level, optname);
}

static void emit_inet6(const char *name, int level, int optname) {
    emit(name, "StandardProtocolFamily.INET6", level, optname);
}

int main(int argc, const char* argv[]) {
    out("// AUTOMATICALLY GENERATED FILE - DO NOT EDIT                                  ");
    out("package sun.nio.ch;                                                            ");
    out("import java.net.SocketOption;                                                  ");
    out("import java.net.StandardSocketOptions;                                         ");
    out("import java.net.ProtocolFamily;                                                ");
    out("import java.net.StandardProtocolFamily;                                        ");
    out("import java.util.Map;                                                          ");
    out("import java.util.HashMap;                                                      ");
    out("class SocketOptionRegistry {                                                   ");
    out("    private SocketOptionRegistry() { }                                         ");
    out("    private static class RegistryKey {                                         ");
    out("        private final SocketOption<?> name;                                    ");
    out("        private final ProtocolFamily family;                                   ");
    out("        RegistryKey(SocketOption<?> name, ProtocolFamily family) {             ");
    out("            this.name = name;                                                  ");
    out("            this.family = family;                                              ");
    out("        }                                                                      ");
    out("        public int hashCode() {                                                ");
    out("            return name.hashCode() + family.hashCode();                        ");
    out("        }                                                                      ");
    out("        public boolean equals(Object ob) {                                     ");
    out("            if (ob == null) return false;                                      ");
    out("            if (!(ob instanceof RegistryKey)) return false;                    ");
    out("            RegistryKey other = (RegistryKey)ob;                               ");
    out("            if (this.name != other.name) return false;                         ");
    out("            if (this.family != other.family) return false;                     ");
    out("            return true;                                                       ");
    out("        }                                                                      ");
    out("    }                                                                          ");
    out("    private static class LazyInitialization {                                  ");
    out("        static final Map<RegistryKey,OptionKey> options = options();           ");
    out("        private static Map<RegistryKey,OptionKey> options() {                  ");
    out("            Map<RegistryKey,OptionKey> map =                                   ");
    out("                new HashMap<RegistryKey,OptionKey>();                          ");

    emit_unspec("StandardSocketOptions.SO_BROADCAST", SOL_SOCKET, SO_BROADCAST);
    emit_unspec("StandardSocketOptions.SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE);
    emit_unspec("StandardSocketOptions.SO_LINGER",    SOL_SOCKET, SO_LINGER);
    emit_unspec("StandardSocketOptions.SO_SNDBUF",    SOL_SOCKET, SO_SNDBUF);
    emit_unspec("StandardSocketOptions.SO_RCVBUF",    SOL_SOCKET, SO_RCVBUF);
    emit_unspec("StandardSocketOptions.SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR);
    emit_unspec("StandardSocketOptions.TCP_NODELAY",  IPPROTO_TCP, TCP_NODELAY);

    emit_inet("StandardSocketOptions.IP_TOS",            IPPROTO_IP,     IP_TOS);
    emit_inet("StandardSocketOptions.IP_MULTICAST_IF",   IPPROTO_IP,     IP_MULTICAST_IF);
    emit_inet("StandardSocketOptions.IP_MULTICAST_TTL",  IPPROTO_IP,     IP_MULTICAST_TTL);
    emit_inet("StandardSocketOptions.IP_MULTICAST_LOOP", IPPROTO_IP,     IP_MULTICAST_LOOP);

#ifdef AF_INET6
    emit_inet6("StandardSocketOptions.IP_MULTICAST_IF",   IPPROTO_IPV6,  IPV6_MULTICAST_IF);
    emit_inet6("StandardSocketOptions.IP_MULTICAST_TTL",  IPPROTO_IPV6,  IPV6_MULTICAST_HOPS);
    emit_inet6("StandardSocketOptions.IP_MULTICAST_LOOP", IPPROTO_IPV6,  IPV6_MULTICAST_LOOP);
#endif

    emit_unspec("ExtendedSocketOption.SO_OOBINLINE", SOL_SOCKET, SO_OOBINLINE);

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

    return 0;
}