/*

 * Copyright (c) 2000, 2021, 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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package sun.nio.ch;

import java.io.IOException;

import java.net.InetAddress;

import java.net.InetSocketAddress;

import java.net.ServerSocket;

import java.net.Socket;

import java.net.SocketAddress;

import java.net.SocketException;

import java.net.SocketOption;

import java.net.StandardSocketOptions;

import java.nio.channels.IllegalBlockingModeException;

import java.nio.channels.ServerSocketChannel;

import java.nio.channels.SocketChannel;

import java.security.AccessController;

import java.security.PrivilegedActionException;

import java.security.PrivilegedExceptionAction;

import java.util.Set;

import static java.util.concurrent.TimeUnit.MILLISECONDS;

// 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.

//

class ServerSocketAdaptor                        // package-private

    extends ServerSocket

{

    // The channel being adapted

    private final ServerSocketChannelImpl ssc;

    // Timeout "option" value for accepts

    private volatile int timeout;

    @SuppressWarnings("removal")

    static ServerSocket create(ServerSocketChannelImpl ssc) {

        PrivilegedExceptionAction<ServerSocket> pa = () -> new ServerSocketAdaptor(ssc);

        try {

            return AccessController.doPrivileged(pa);

        } catch (PrivilegedActionException pae) {

            throw new InternalError("Should not reach here", pae);

        }

    }

    private ServerSocketAdaptor(ServerSocketChannelImpl ssc) {

        super(DummySocketImpl.create());

        this.ssc = ssc;

    }

    @Override

    public void bind(SocketAddress local) throws IOException {

        bind(local, 50);

    }

    @Override

    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);

        }

    }

    @Override

    public InetAddress getInetAddress() {

        SocketAddress local = ssc.localAddress();

        if (local == null) {

            return null;

        } else {

            return Net.getRevealedLocalAddress(local).getAddress();

        }

    }

    @Override

    public int getLocalPort() {

        InetSocketAddress local = (InetSocketAddress) ssc.localAddress();

        if (local == null) {

            return -1;

        } else {

            return local.getPort();

        }

    }

    @Override

    public Socket accept() throws IOException {

        SocketChannel sc = null;

        try {

            int timeout = this.timeout;

            if (timeout > 0) {

                long nanos = MILLISECONDS.toNanos(timeout);

                sc = ssc.blockingAccept(nanos);

            } else {

                // accept connection if possible when non-blocking (to preserve

                // long standing behavior)

                sc = ssc.accept();

                if (sc == null) {

                    throw new IllegalBlockingModeException();

                }

            }

        } catch (Exception e) {

            Net.translateException(e);

        }

        return sc.socket();

    }

    @Override

    public void close() throws IOException {

        ssc.close();

    }

    @Override

    public ServerSocketChannel getChannel() {

        return ssc;

    }

    @Override

    public boolean isBound() {

        return ssc.isBound();

    }

    @Override

    public boolean isClosed() {

        return !ssc.isOpen();

    }

    @Override

    public void setSoTimeout(int timeout) throws SocketException {

        if (!ssc.isOpen())

            throw new SocketException("Socket is closed");

        if (timeout < 0)

            throw new IllegalArgumentException("timeout < 0");

        this.timeout = timeout;

    }

    @Override

    public int getSoTimeout() throws SocketException {

        if (!ssc.isOpen())

            throw new SocketException("Socket is closed");

        return timeout;

    }

    @Override

    public void setReuseAddress(boolean on) throws SocketException {

        try {

            ssc.setOption(StandardSocketOptions.SO_REUSEADDR, on);

        } catch (IOException x) {

            Net.translateToSocketException(x);

        }

    }

    @Override

    public boolean getReuseAddress() throws SocketException {

        try {

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

        } catch (IOException x) {

            Net.translateToSocketException(x);

            return false;       // Never happens

        }

    }

    @Override

    public String toString() {

        if (!isBound())

            return "ServerSocket[unbound]";

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

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

    }

    @Override

    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(StandardSocketOptions.SO_RCVBUF, size);

        } catch (IOException x) {

            Net.translateToSocketException(x);

        }

    }

    @Override

    public int getReceiveBufferSize() throws SocketException {

        try {

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

        } catch (IOException x) {

            Net.translateToSocketException(x);

            return -1;          // Never happens

        }

    }

    @Override

    public <T> ServerSocket setOption(SocketOption<T> name, T value) throws IOException {

        ssc.setOption(name, value);

        return this;

    }

    @Override

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

        return ssc.getOption(name);

    }

    @Override

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

        return ssc.supportedOptions();

    }

}