/*

 * Copyright (c) 2007, 2018, 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

 * 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 java.nio.channels.SelectableChannel;

abstract class FileDispatcher extends NativeDispatcher {

    public static final int NO_LOCK = -1;       // Failed to lock

    public static final int LOCKED = 0;         // Obtained requested lock

    public static final int RET_EX_LOCK = 1;    // Obtained exclusive lock

    public static final int INTERRUPTED = 2;    // Request interrupted

    /**

     * Sets or reports this file's position

     * If offset is -1, the current position is returned

     * otherwise the position is set to offset.

     */

    abstract long seek(FileDescriptor fd, long offset) throws IOException;

    abstract int force(FileDescriptor fd, boolean metaData) throws IOException;

    abstract int truncate(FileDescriptor fd, long size) throws IOException;

    abstract long size(FileDescriptor fd) throws IOException;

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

                       boolean shared) throws IOException;

    abstract void release(FileDescriptor fd, long pos, long size)

        throws IOException;

    /**

     * Returns a dup of fd if a file descriptor is required for

     * memory-mapping operations, otherwise returns an invalid

     * FileDescriptor (meaning a newly allocated FileDescriptor)

     */

    abstract FileDescriptor duplicateForMapping(FileDescriptor fd)

        throws IOException;

    abstract boolean canTransferToDirectly(SelectableChannel sc);

    abstract boolean transferToDirectlyNeedsPositionLock();

    abstract int setDirectIO(FileDescriptor fd, String path);

}