WaarpFailedFuture.java

/**
 * This file is part of Waarp Project.
 * 
 * Copyright 2009, Frederic Bregier, and individual contributors by the @author tags. See the
 * COPYRIGHT.txt in the distribution for a full listing of individual contributors.
 * 
 * All Waarp Project is free software: you can redistribute it and/or modify it under the terms of
 * the GNU General Public License as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 * 
 * Waarp 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 for more details.
 * 
 * You should have received a copy of the GNU General Public License along with Waarp . If not, see
 * <http://www.gnu.org/licenses/>.
 */
package org.waarp.common.future;

/**
 * Future in failure
 * 
 * @author Frederic Bregier
 * 
 */
public class WaarpFailedFuture extends WaarpCompletedFuture {

    private final Throwable cause;

    /**
     * Creates a new instance.
     * 
     * @param cause
     *            the cause of failure
     */
    public WaarpFailedFuture(Throwable cause) {
        super();
        if (cause == null) {
            throw new NullPointerException("cause");
        }
        this.cause = cause;
    }

    @Override
    public synchronized Throwable getCause() {
        return cause;
    }

    @Override
    public synchronized boolean isSuccess() {
        return false;
    }

    public WaarpFuture rethrowIfFailed() throws Exception {
        if (cause instanceof Exception) {
            throw (Exception) cause;
        }

        if (cause instanceof Error) {
            throw (Error) cause;
        }

        throw new RuntimeException(cause);
    }
}