97 lines
3.0 KiB
Java
97 lines
3.0 KiB
Java
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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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* 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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}
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