/*

 * 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.*;

import java.security.PrivilegedAction;

/*

 * This class PlainSocketImpl simply delegates to the appropriate real

 * SocketImpl. We do this because PlainSocketImpl is already extended

 * by SocksSocketImpl.

 * <p>

 * There are two possibilities for the real SocketImpl,

 * TwoStacksPlainSocketImpl or DualStackPlainSocketImpl. We use

 * DualStackPlainSocketImpl on systems that have a dual stack

 * TCP implementation. Otherwise we create an instance of

 * TwoStacksPlainSocketImpl and delegate to it.

 *

 * @author Chris Hegarty

 */

class PlainSocketImpl extends AbstractPlainSocketImpl

{

    private AbstractPlainSocketImpl impl;

    /* the windows version. */

    private static float version;

    /* java.net.preferIPv4Stack */

    private static boolean preferIPv4Stack = false;

    /* If the version supports a dual stack TCP implementation */

    private static boolean useDualStackImpl = false;

    /* sun.net.useExclusiveBind */

    private static String exclBindProp;

    /* True if exclusive binding is on for Windows */

    private static boolean exclusiveBind = true;

    static {

        java.security.AccessController.doPrivileged( new PrivilegedAction<Object>() {

                public Object run() {

                    version = 0;

                    try {

                        version = Float.parseFloat(System.getProperties().getProperty("os.version"));

                        preferIPv4Stack = Boolean.parseBoolean(

                                          System.getProperties().getProperty("java.net.preferIPv4Stack"));

                        exclBindProp = System.getProperty("sun.net.useExclusiveBind");

                    } catch (NumberFormatException e ) {

                        assert false : e;

                    }

                    return null; // nothing to return

                } });

        // (version >= 6.0) implies Vista or greater.

        if (version >= 6.0 && !preferIPv4Stack) {

                useDualStackImpl = true;

        }

        if (exclBindProp != null) {

            // sun.net.useExclusiveBind is true

            exclusiveBind = exclBindProp.length() == 0 ? true

                    : Boolean.parseBoolean(exclBindProp);

        } else if (version < 6.0) {

            exclusiveBind = false;

        }

    }

    /**

     * Constructs an empty instance.

     */

    PlainSocketImpl() {

        if (useDualStackImpl) {

            impl = new DualStackPlainSocketImpl(exclusiveBind);

        } else {

            impl = new TwoStacksPlainSocketImpl(exclusiveBind);

        }

    }

    /**

     * Constructs an instance with the given file descriptor.

     */

    PlainSocketImpl(FileDescriptor fd) {

        if (useDualStackImpl) {

            impl = new DualStackPlainSocketImpl(fd, exclusiveBind);

        } else {

            impl = new TwoStacksPlainSocketImpl(fd, exclusiveBind);

        }

    }

    // Override methods in SocketImpl that access impl's fields.

    protected FileDescriptor getFileDescriptor() {

        return impl.getFileDescriptor();

    }

    protected InetAddress getInetAddress() {

        return impl.getInetAddress();

    }

    protected int getPort() {

        return impl.getPort();

    }

    protected int getLocalPort() {

        return impl.getLocalPort();

    }

    void setSocket(Socket soc) {

        impl.setSocket(soc);

    }

    Socket getSocket() {

        return impl.getSocket();

    }

    void setServerSocket(ServerSocket soc) {

        impl.setServerSocket(soc);

    }

    ServerSocket getServerSocket() {

        return impl.getServerSocket();

    }

    public String toString() {

        return impl.toString();

    }

    // Override methods in AbstractPlainSocketImpl that access impl's fields.

    protected synchronized void create(boolean stream) throws IOException {

        impl.create(stream);

        // set fd to delegate's fd to be compatible with older releases

        this.fd = impl.fd;

    }

    protected void connect(String host, int port)

        throws UnknownHostException, IOException

    {

        impl.connect(host, port);

    }

    protected void connect(InetAddress address, int port) throws IOException {

        impl.connect(address, port);

    }

    protected void connect(SocketAddress address, int timeout) throws IOException {

        impl.connect(address, timeout);

    }

    public void setOption(int opt, Object val) throws SocketException {

        impl.setOption(opt, val);

    }

    public Object getOption(int opt) throws SocketException {

        return impl.getOption(opt);

    }

    synchronized void doConnect(InetAddress address, int port, int timeout) throws IOException {

        impl.doConnect(address, port, timeout);

    }

    protected synchronized void bind(InetAddress address, int lport)

        throws IOException

    {

        impl.bind(address, lport);

    }

    protected synchronized void accept(SocketImpl s) throws IOException {

        if (s instanceof PlainSocketImpl) {

            // pass in the real impl not the wrapper.

            SocketImpl delegate = ((PlainSocketImpl)s).impl;

            delegate.address = new InetAddress();

            delegate.fd = new FileDescriptor();

            impl.accept(delegate);

            // set fd to delegate's fd to be compatible with older releases

            s.fd = delegate.fd;

        } else {

            impl.accept(s);

        }

    }

    void setFileDescriptor(FileDescriptor fd) {

        impl.setFileDescriptor(fd);

    }

    void setAddress(InetAddress address) {

        impl.setAddress(address);

    }

    void setPort(int port) {

        impl.setPort(port);

    }

    void setLocalPort(int localPort) {

        impl.setLocalPort(localPort);

    }

    protected synchronized InputStream getInputStream() throws IOException {

        return impl.getInputStream();

    }

    void setInputStream(SocketInputStream in) {

        impl.setInputStream(in);

    }

    protected synchronized OutputStream getOutputStream() throws IOException {

        return impl.getOutputStream();

    }

    protected void close() throws IOException {

        try {

            impl.close();

        } finally {

            // set fd to delegate's fd to be compatible with older releases

            this.fd = null;

        }

    }

    void reset() throws IOException {

        try {

            impl.reset();

        } finally {

            // set fd to delegate's fd to be compatible with older releases

            this.fd = null;

        }

    }

    protected void shutdownInput() throws IOException {

        impl.shutdownInput();

    }

    protected void shutdownOutput() throws IOException {

        impl.shutdownOutput();

    }

    protected void sendUrgentData(int data) throws IOException {

        impl.sendUrgentData(data);

    }

    FileDescriptor acquireFD() {

        return impl.acquireFD();

    }

    void releaseFD() {

        impl.releaseFD();

    }

    public boolean isConnectionReset() {

        return impl.isConnectionReset();

    }

    public boolean isConnectionResetPending() {

        return impl.isConnectionResetPending();

    }

    public void setConnectionReset() {

        impl.setConnectionReset();

    }

    public void setConnectionResetPending() {

        impl.setConnectionResetPending();

    }

    public boolean isClosedOrPending() {

        return impl.isClosedOrPending();

    }

    public int getTimeout() {

        return impl.getTimeout();

    }

    // Override methods in AbstractPlainSocketImpl that need to be implemented.

    void socketCreate(boolean isServer) throws IOException {

        impl.socketCreate(isServer);

    }

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

        throws IOException {

        impl.socketConnect(address, port, timeout);

    }

    void socketBind(InetAddress address, int port)

        throws IOException {

        impl.socketBind(address, port);

    }

    void socketListen(int count) throws IOException {

        impl.socketListen(count);

    }

    void socketAccept(SocketImpl s) throws IOException {

        impl.socketAccept(s);

    }

    int socketAvailable() throws IOException {

        return impl.socketAvailable();

    }

    void socketClose0(boolean useDeferredClose) throws IOException {

        impl.socketClose0(useDeferredClose);

    }

    void socketShutdown(int howto) throws IOException {

        impl.socketShutdown(howto);

    }

    void socketSetOption(int cmd, boolean on, Object value)

        throws SocketException {

        impl.socketSetOption(cmd, on, value);

    }

    int socketGetOption(int opt, Object iaContainerObj) throws SocketException {

        return impl.socketGetOption(opt, iaContainerObj);

    }

    void socketSendUrgentData(int data) throws IOException {

        impl.socketSendUrgentData(data);

    }

}