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windows » sun » nio » ch » FileDispatcher.java
/*
 * Copyright 2000-2003 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.*;


/**
 * Allows different platforms to call different native methods
 * for read and write operations.
 */

class FileDispatcher extends NativeDispatcher
{

    static {
        Util.load();
    }

    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, Object lock) throws IOException
    {
        synchronized(lock) {
            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, Object lock) throws IOException
    {
        synchronized(lock) {
            return pwrite0(fd, address, len, position);
        }
    }

    long writev(FileDescriptor fd, long address, int len) throws IOException {
        return writev0(fd, address, len);
    }

    void close(FileDescriptor fd) throws IOException {
        close0(fd);
    }

    //-- 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 void close0(FileDescriptor fd) throws IOException;

    static native void closeByHandle(long fd) throws IOException;

}
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