/*

 * 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.

 */

package java.net;

import java.io.IOException;

import java.io.FileDescriptor;

import java.util.Set;

import java.util.HashSet;

import sun.net.ext.ExtendedSocketOptions;

/*

 * On Unix systems we simply delegate to native methods.

 *

 * @author Chris Hegarty

 */

class PlainSocketImpl extends AbstractPlainSocketImpl

{

    static {

        initProto();

    }

    /**

     * Constructs an empty instance.

     */

    PlainSocketImpl() { }

    /**

     * Constructs an instance with the given file descriptor.

     */

    PlainSocketImpl(FileDescriptor fd) {

        this.fd = fd;

    }

    static final ExtendedSocketOptions extendedOptions =

            ExtendedSocketOptions.getInstance();

    protected <T> void setOption(SocketOption<T> name, T value) throws IOException {

        if (isClosedOrPending()) {

            throw new SocketException("Socket closed");

        }

        if (supportedOptions().contains(name)) {

            if (extendedOptions.isOptionSupported(name)) {

                extendedOptions.setOption(fd, name, value);

            } else {

                super.setOption(name, value);

            }

        } else {

            throw new UnsupportedOperationException("unsupported option");

        }

    }

    @SuppressWarnings("unchecked")

    protected <T> T getOption(SocketOption<T> name) throws IOException {

        if (isClosedOrPending()) {

            throw new SocketException("Socket closed");

        }

        if (supportedOptions().contains(name)) {

            if (extendedOptions.isOptionSupported(name)) {

                return (T) extendedOptions.getOption(fd, name);

            } else {

                return super.getOption(name);

            }

        } else {

            throw new UnsupportedOperationException("unsupported option");

        }

    }

    protected Set<SocketOption<?>> supportedOptions() {

        HashSet<SocketOption<?>> options = new HashSet<>(super.supportedOptions());

        return options;

    }

    protected void socketSetOption(int opt, boolean b, Object val) throws SocketException {

        if (opt == SocketOptions.SO_REUSEPORT &&

            !supportedOptions().contains(StandardSocketOptions.SO_REUSEPORT)) {

            throw new UnsupportedOperationException("unsupported option");

        }

        try {

            socketSetOption0(opt, b, val);

        } catch (SocketException se) {

            if (socket == null || !socket.isConnected())

                throw se;

        }

    }

    native void socketCreate(boolean isServer) throws IOException;

    native void socketConnect(InetAddress address, int port, int timeout)

        throws IOException;

    native void socketBind(InetAddress address, int port)

        throws IOException;

    native void socketListen(int count) throws IOException;

    native void socketAccept(SocketImpl s) throws IOException;

    native int socketAvailable() throws IOException;

    native void socketClose0(boolean useDeferredClose) throws IOException;

    native void socketShutdown(int howto) throws IOException;

    static native void initProto();

    native void socketSetOption0(int cmd, boolean on, Object value)

        throws SocketException;

    native int socketGetOption(int opt, Object iaContainerObj) throws SocketException;

    native void socketSendUrgentData(int data) throws IOException;

}