--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/sun/nio/ch/NativeDispatcher.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2000-2002 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.
+ */
+
+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
+    }
+
+}