/* * Copyright (c) 2000, 2002, 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.*; /** * Allows different platforms to call different native methods * for read and write operations. */ abstract class NativeDispatcher{     abstract int read(FileDescriptor fd, long address, int len)        throws IOException;     int pread(FileDescriptor fd, long address, int len,                             long position, Object lock) throws IOException    {        throw new IOException("Operation Unsupported");    }     abstract long readv(FileDescriptor fd, long address, int len)        throws IOException;     abstract int write(FileDescriptor fd, long address, int len)        throws IOException;     int pwrite(FileDescriptor fd, long address, int len,                             long position, Object lock) throws IOException    {        throw new IOException("Operation Unsupported");    }     abstract long writev(FileDescriptor fd, long address, int len)        throws IOException;     abstract void close(FileDescriptor fd) throws IOException;     // Prepare the given fd for closing by duping it to a known internal fd    // that's already closed.  This is necessary on some operating systems    // (Solaris and Linux) to prevent fd recycling.    //    void preClose(FileDescriptor fd) throws IOException {        // Do nothing by default; this is only needed on Unix    } }