| /* |
| * Copyright (c) 2008, 2010, 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.util.concurrent.Future; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.ExecutionException; |
| import java.io.IOException; |
| |
| /** |
| * A Future representing the result of an I/O operation that has already |
| * completed. |
| */ |
| |
| final class CompletedFuture<V> implements Future<V> { |
| private final V result; |
| private final Throwable exc; |
| |
| private CompletedFuture(V result, Throwable exc) { |
| this.result = result; |
| this.exc = exc; |
| } |
| |
| static <V> CompletedFuture<V> withResult(V result) { |
| return new CompletedFuture<V>(result, null); |
| } |
| |
| static <V> CompletedFuture<V> withFailure(Throwable exc) { |
| // exception must be IOException or SecurityException |
| if (!(exc instanceof IOException) && !(exc instanceof SecurityException)) |
| exc = new IOException(exc); |
| return new CompletedFuture<V>(null, exc); |
| } |
| |
| static <V> CompletedFuture<V> withResult(V result, Throwable exc) { |
| if (exc == null) { |
| return withResult(result); |
| } else { |
| return withFailure(exc); |
| } |
| } |
| |
| @Override |
| public V get() throws ExecutionException { |
| if (exc != null) |
| throw new ExecutionException(exc); |
| return result; |
| } |
| |
| @Override |
| public V get(long timeout, TimeUnit unit) throws ExecutionException { |
| if (unit == null) |
| throw new NullPointerException(); |
| if (exc != null) |
| throw new ExecutionException(exc); |
| return result; |
| } |
| |
| @Override |
| public boolean isCancelled() { |
| return false; |
| } |
| |
| @Override |
| public boolean isDone() { |
| return true; |
| } |
| |
| @Override |
| public boolean cancel(boolean mayInterruptIfRunning) { |
| return false; |
| } |
| } |