/*

 * 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 sun.nio.ch;

import java.io.FileDescriptor;

import java.io.IOException;

import jdk.internal.access.JavaIOFileDescriptorAccess;

import jdk.internal.access.SharedSecrets;

class FileDispatcherImpl extends FileDispatcher {

    static {

        IOUtil.load();

        init();

    }

    private static final JavaIOFileDescriptorAccess fdAccess =

            SharedSecrets.getJavaIOFileDescriptorAccess();

    FileDispatcherImpl() {

    }

    int read(FileDescriptor fd, long address, int len) throws IOException {

        return read0(fd, address, len);

    }

    int pread(FileDescriptor fd, long address, int len, long position)

        throws IOException

    {

        return pread0(fd, address, len, position);

    }

    long readv(FileDescriptor fd, long address, int len) throws IOException {

        return readv0(fd, address, len);

    }

    int write(FileDescriptor fd, long address, int len) throws IOException {

        return write0(fd, address, len);

    }

    int pwrite(FileDescriptor fd, long address, int len, long position)

        throws IOException

    {

        return pwrite0(fd, address, len, position);

    }

    long writev(FileDescriptor fd, long address, int len)

        throws IOException

    {

        return writev0(fd, address, len);

    }

    long seek(FileDescriptor fd, long offset) throws IOException {

        return seek0(fd, offset);

    }

    int force(FileDescriptor fd, boolean metaData) throws IOException {

        return force0(fd, metaData);

    }

    int truncate(FileDescriptor fd, long size) throws IOException {

        return truncate0(fd, size);

    }

    long size(FileDescriptor fd) throws IOException {

        return size0(fd);

    }

    int lock(FileDescriptor fd, boolean blocking, long pos, long size,

             boolean shared) throws IOException

    {

        return lock0(fd, blocking, pos, size, shared);

    }

    void release(FileDescriptor fd, long pos, long size) throws IOException {

        release0(fd, pos, size);

    }

    void close(FileDescriptor fd) throws IOException {

        fdAccess.close(fd);

    }

    void preClose(FileDescriptor fd) throws IOException {

        preClose0(fd);

    }

    FileDescriptor duplicateForMapping(FileDescriptor fd) {

        // file descriptor not required for mapping operations; okay

        // to return invalid file descriptor.

        return new FileDescriptor();

    }

    boolean canTransferToDirectly(java.nio.channels.SelectableChannel sc) {

        return true;

    }

    boolean transferToDirectlyNeedsPositionLock() {

        return false;

    }

    int setDirectIO(FileDescriptor fd, String path) {

        int result = -1;

        try {

            result = setDirect0(fd);

        } catch (IOException e) {

            throw new UnsupportedOperationException

                ("Error setting up DirectIO", e);

        }

        return result;

    }

    // -- Native methods --

    static native int read0(FileDescriptor fd, long address, int len)

        throws IOException;

    static native int pread0(FileDescriptor fd, long address, int len,

                             long position) throws IOException;

    static native long readv0(FileDescriptor fd, long address, int len)

        throws IOException;

    static native int write0(FileDescriptor fd, long address, int len)

        throws IOException;

    static native int pwrite0(FileDescriptor fd, long address, int len,

                             long position) throws IOException;

    static native long writev0(FileDescriptor fd, long address, int len)

        throws IOException;

    static native int force0(FileDescriptor fd, boolean metaData)

        throws IOException;

    static native long seek0(FileDescriptor fd, long offset)

        throws IOException;

    static native int truncate0(FileDescriptor fd, long size)

        throws IOException;

    static native long size0(FileDescriptor fd) throws IOException;

    static native int lock0(FileDescriptor fd, boolean blocking, long pos,

                            long size, boolean shared) throws IOException;

    static native void release0(FileDescriptor fd, long pos, long size)

        throws IOException;

    // Shared with SocketDispatcher and DatagramDispatcher but

    // NOT used by FileDispatcherImpl

    static native void close0(FileDescriptor fd) throws IOException;

    static native void preClose0(FileDescriptor fd) throws IOException;

    static native void closeIntFD(int fd) throws IOException;

    static native int setDirect0(FileDescriptor fd) throws IOException;

    static native void init();

}