| /* AbstractInterruptibleChannel.java -- |
| Copyright (C) 2002, 2004 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| package java.nio.channels.spi; |
| |
| import java.io.IOException; |
| import java.nio.channels.AsynchronousCloseException; |
| import java.nio.channels.Channel; |
| import java.nio.channels.InterruptibleChannel; |
| |
| |
| /** |
| * @author Michael Koch |
| * @since 1.4 |
| */ |
| public abstract class AbstractInterruptibleChannel |
| implements Channel, InterruptibleChannel |
| { |
| private boolean closed; |
| |
| /** |
| * Initializes the channel. |
| */ |
| protected AbstractInterruptibleChannel() |
| { |
| } |
| |
| /** |
| * Marks the beginning of an I/O operation that might block indefinitely. |
| */ |
| protected final void begin() |
| { |
| } |
| |
| /** |
| * Closes the channel. |
| * |
| * @exception IOException If an error occurs |
| */ |
| public final void close() throws IOException |
| { |
| if (! closed) |
| { |
| closed = true; |
| implCloseChannel(); |
| } |
| } |
| |
| /** |
| * Marks the end of an I/O operation that might block indefinitely. |
| * |
| * @param completed true if the task completed successfully, |
| * false otherwise |
| * |
| * @exception IOException if an error occurs |
| * @exception AsynchronousCloseException If the channel was asynchronously |
| * closed. |
| * @exception ClosedByInterruptException If the thread blocked in the |
| * I/O operation was interrupted. |
| */ |
| protected final void end(boolean completed) |
| throws AsynchronousCloseException |
| { |
| // FIXME: check more here. |
| |
| if (closed) throw new AsynchronousCloseException(); |
| } |
| |
| /** |
| * Closes the channel. |
| * |
| * @exception IOException If an error occurs |
| */ |
| protected abstract void implCloseChannel() throws IOException; |
| |
| /** |
| * Tells whether or not this channel is open. |
| * |
| * @return true if the channel is open, false otherwise |
| */ |
| public final boolean isOpen() |
| { |
| return ! closed; |
| } |
| } |