src/java.base/share/classes/sun/nio/ch/CompletedFuture.java
author igerasim
Wed, 21 Aug 2019 13:49:16 -0700
changeset 57826 bf4c808a4488
parent 47216 71c04702a3d5
permissions -rw-r--r--
8211360: Change #if DEF to #if defined(DEF) Reviewed-by: bpb, vtewari
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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}