CompletedFuture.java

/*
 * Copyright (c) 1997, 2013, 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 com.sun.xml.internal.ws.util;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

/**
 * {@link Future} implementation that obtains an already available value.
 *
 * @author Kohsuke Kawaguchi
 * @author Jitendra Kotamraju
 */
public class CompletedFuture<T> implements Future<T> {
    private final T v;
    private final Throwable re;

    public CompletedFuture(T v, Throwable re) {
        this.v = v;
        this.re = re;
    }

    public boolean cancel(boolean mayInterruptIfRunning) {
        return false;
    }

    public boolean isCancelled() {
        return false;
    }

    public boolean isDone() {
        return true;
    }

    public T get() throws ExecutionException {
        if (re != null) {
            throw new ExecutionException(re);
        }
        return v;
    }

    public T get(long timeout, TimeUnit unit) throws ExecutionException {
        return get();
    }
}