author | igerasim |
Wed, 21 Aug 2019 13:49:16 -0700 | |
changeset 57826 | bf4c808a4488 |
parent 47216 | 71c04702a3d5 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package sun.nio.ch; |
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import java.util.concurrent.Future; |
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import java.util.concurrent.TimeUnit; |
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import java.util.concurrent.ExecutionException; |
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import java.io.IOException; |
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|
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/** |
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* A Future representing the result of an I/O operation that has already |
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* completed. |
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*/ |
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final class CompletedFuture<V> implements Future<V> { |
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private final V result; |
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private final Throwable exc; |
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private CompletedFuture(V result, Throwable exc) { |
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this.result = result; |
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this.exc = exc; |
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} |
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static <V> CompletedFuture<V> withResult(V result) { |
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return new CompletedFuture<V>(result, null); |
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} |
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static <V> CompletedFuture<V> withFailure(Throwable exc) { |
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// exception must be IOException or SecurityException |
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if (!(exc instanceof IOException) && !(exc instanceof SecurityException)) |
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exc = new IOException(exc); |
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return new CompletedFuture<V>(null, exc); |
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} |
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static <V> CompletedFuture<V> withResult(V result, Throwable exc) { |
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if (exc == null) { |
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return withResult(result); |
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} else { |
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return withFailure(exc); |
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} |
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} |
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@Override |
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public V get() throws ExecutionException { |
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if (exc != null) |
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throw new ExecutionException(exc); |
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return result; |
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} |
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@Override |
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public V get(long timeout, TimeUnit unit) throws ExecutionException { |
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if (unit == null) |
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throw new NullPointerException(); |
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if (exc != null) |
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throw new ExecutionException(exc); |
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return result; |
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} |
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@Override |
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public boolean isCancelled() { |
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return false; |
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} |
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@Override |
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public boolean isDone() { |
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return true; |
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} |
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@Override |
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public boolean cancel(boolean mayInterruptIfRunning) { |
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return false; |
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} |
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} |