/*

 * 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.  Sun designates this

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

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

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 */

package sun.nio.ch;

import java.io.*;

import java.net.*;

import java.nio.channels.*;

// Make a server-socket channel look like a server socket.

//

// The methods in this class are defined in exactly the same order as in

// java.net.ServerSocket so as to simplify tracking future changes to that

// class.

//

public class ServerSocketAdaptor                        // package-private

    extends ServerSocket

{

    // The channel being adapted

    private final ServerSocketChannelImpl ssc;

    // Timeout "option" value for accepts

    private volatile int timeout = 0;

    public static ServerSocket create(ServerSocketChannelImpl ssc) {

        try {

            return new ServerSocketAdaptor(ssc);

        } catch (IOException x) {

            throw new Error(x);

        }

    }

    // ## super will create a useless impl

    private ServerSocketAdaptor(ServerSocketChannelImpl ssc)

        throws IOException

    {

        this.ssc = ssc;

    }

    public void bind(SocketAddress local) throws IOException {

        bind(local, 50);

    }

    public void bind(SocketAddress local, int backlog) throws IOException {

        if (local == null)

            local = new InetSocketAddress(0);

        try {

            ssc.bind(local, backlog);

        } catch (Exception x) {

            Net.translateException(x);

        }

    }

    public InetAddress getInetAddress() {

        if (!ssc.isBound())

            return null;

        return Net.asInetSocketAddress(ssc.localAddress()).getAddress();

    }

    public int getLocalPort() {

        if (!ssc.isBound())

            return -1;

        return Net.asInetSocketAddress(ssc.localAddress()).getPort();

    }

    public Socket accept() throws IOException {

        synchronized (ssc.blockingLock()) {

            if (!ssc.isBound())

                throw new IllegalBlockingModeException();

            try {

                if (timeout == 0) {

                    SocketChannel sc = ssc.accept();

                    if (sc == null && !ssc.isBlocking())

                        throw new IllegalBlockingModeException();

                    return sc.socket();

                }

                // Implement timeout with a selector

                SelectionKey sk = null;

                Selector sel = null;

                ssc.configureBlocking(false);

                try {

                    SocketChannel sc;

                    if ((sc = ssc.accept()) != null)

                        return sc.socket();

                    sel = Util.getTemporarySelector(ssc);

                    sk = ssc.register(sel, SelectionKey.OP_ACCEPT);

                    long to = timeout;

                    for (;;) {

                        if (!ssc.isOpen())

                            throw new ClosedChannelException();

                        long st = System.currentTimeMillis();

                        int ns = sel.select(to);

                        if (ns > 0 &&

                            sk.isAcceptable() && ((sc = ssc.accept()) != null))

                            return sc.socket();

                        sel.selectedKeys().remove(sk);

                        to -= System.currentTimeMillis() - st;

                        if (to <= 0)

                            throw new SocketTimeoutException();

                    }

                } finally {

                    if (sk != null)

                        sk.cancel();

                    if (ssc.isOpen())

                        ssc.configureBlocking(true);

                    if (sel != null)

                        Util.releaseTemporarySelector(sel);

                }

            } catch (Exception x) {

                Net.translateException(x);

                assert false;

                return null;            // Never happens

            }

        }

    }

    public void close() throws IOException {

        try {

            ssc.close();

        } catch (Exception x) {

            Net.translateException(x);

        }

    }

    public ServerSocketChannel getChannel() {

        return ssc;

    }

    public boolean isBound() {

        return ssc.isBound();

    }

    public boolean isClosed() {

        return !ssc.isOpen();

    }

    public void setSoTimeout(int timeout) throws SocketException {

        this.timeout = timeout;

    }

    public int getSoTimeout() throws SocketException {

        return timeout;

    }

    public void setReuseAddress(boolean on) throws SocketException {

        try {

            ssc.setOption(StandardSocketOption.SO_REUSEADDR, on);

        } catch (IOException x) {

            Net.translateToSocketException(x);

        }

    }

    public boolean getReuseAddress() throws SocketException {

        try {

            return ssc.getOption(StandardSocketOption.SO_REUSEADDR).booleanValue();

        } catch (IOException x) {

            Net.translateToSocketException(x);

            return false;       // Never happens

        }

    }

    public String toString() {

        if (!isBound())

            return "ServerSocket[unbound]";

        return "ServerSocket[addr=" + getInetAddress() +

            //          ",port=" + getPort() +

                ",localport=" + getLocalPort()  + "]";

    }

    public void setReceiveBufferSize(int size) throws SocketException {

        // size 0 valid for ServerSocketChannel, invalid for ServerSocket

        if (size <= 0)

            throw new IllegalArgumentException("size cannot be 0 or negative");

        try {

            ssc.setOption(StandardSocketOption.SO_RCVBUF, size);

        } catch (IOException x) {

            Net.translateToSocketException(x);

        }

    }

    public int getReceiveBufferSize() throws SocketException {

        try {

            return ssc.getOption(StandardSocketOption.SO_RCVBUF).intValue();

        } catch (IOException x) {

            Net.translateToSocketException(x);

            return -1;          // Never happens

        }

    }

}