/*

 * Copyright 2002-2006 Sun Microsystems, Inc.  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.  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

 * have any questions.

 */

/*

 */

package sun.nio.ch;

import java.io.IOException;

import java.io.FileDescriptor;

import java.nio.ByteBuffer;

import java.nio.channels.*;

import java.nio.channels.spi.*;

/**

 * Pipe.SourceChannel implementation based on socket connection.

 */

class SourceChannelImpl

    extends Pipe.SourceChannel

    implements SelChImpl

{

    // The SocketChannel assoicated with this pipe

    SocketChannel sc;

    public FileDescriptor getFD() {

        return ((SocketChannelImpl) sc).getFD();

    }

    public int getFDVal() {

        return ((SocketChannelImpl) sc).getFDVal();

    }

    SourceChannelImpl(SelectorProvider sp, SocketChannel sc) {

        super(sp);

        this.sc = sc;

    }

    protected void implCloseSelectableChannel() throws IOException {

        if (!isRegistered())

            kill();

    }

    public void kill() throws IOException {

        sc.close();

    }

    protected void implConfigureBlocking(boolean block) throws IOException {

        sc.configureBlocking(block);

    }

    public boolean translateReadyOps(int ops, int initialOps,

                                     SelectionKeyImpl sk) {

        int intOps = sk.nioInterestOps(); // Do this just once, it synchronizes

        int oldOps = sk.nioReadyOps();

        int newOps = initialOps;

        if ((ops & PollArrayWrapper.POLLNVAL) != 0)

            throw new Error("POLLNVAL detected");

        if ((ops & (PollArrayWrapper.POLLERR

                    | PollArrayWrapper.POLLHUP)) != 0) {

            newOps = intOps;

            sk.nioReadyOps(newOps);

            return (newOps & ~oldOps) != 0;

        }

        if (((ops & PollArrayWrapper.POLLIN) != 0) &&

            ((intOps & SelectionKey.OP_READ) != 0))

            newOps |= SelectionKey.OP_READ;

        sk.nioReadyOps(newOps);

        return (newOps & ~oldOps) != 0;

    }

    public boolean translateAndUpdateReadyOps(int ops, SelectionKeyImpl sk) {

        return translateReadyOps(ops, sk.nioReadyOps(), sk);

    }

    public boolean translateAndSetReadyOps(int ops, SelectionKeyImpl sk) {

        return translateReadyOps(ops, 0, sk);

    }

    public void translateAndSetInterestOps(int ops, SelectionKeyImpl sk) {

        if ((ops & SelectionKey.OP_READ) != 0)

            ops = PollArrayWrapper.POLLIN;

        sk.selector.putEventOps(sk, ops);

    }

    public int read(ByteBuffer dst) throws IOException {

        try {

            return sc.read(dst);

        } catch (AsynchronousCloseException x) {

            close();

            throw x;

        }

    }

    public long read(ByteBuffer[] dsts, int offset, int length)

        throws IOException

    {

        if ((offset < 0) || (length < 0) || (offset > dsts.length - length))

           throw new IndexOutOfBoundsException();

        try {

            return read(Util.subsequence(dsts, offset, length));

        } catch (AsynchronousCloseException x) {

            close();

            throw x;

        }

    }

    public long read(ByteBuffer[] dsts) throws IOException {

        try {

            return sc.read(dsts);

        } catch (AsynchronousCloseException x) {

            close();

            throw x;

        }

    }

}