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/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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*
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* Copyright 2011 OpenConcerto, by ILM Informatique. All rights reserved.
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*
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* The contents of this file are subject to the terms of the GNU General Public License Version 3
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* only ("GPL"). You may not use this file except in compliance with the License. You can obtain a
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* copy of the License at http://www.gnu.org/licenses/gpl-3.0.html See the License for the specific
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* language governing permissions and limitations under the License.
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*
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* When distributing the software, include this License Header Notice in each file.
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*/
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package org.openconcerto.utils.cc;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.FutureTask;
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public class ExceptionFuture<V, X extends Exception, X2 extends Exception> extends FutureTask<V> {
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static public class OneExceptionFuture<V, X extends Exception> extends ExceptionFuture<V, X, RuntimeException> {
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public <X2 extends RuntimeException> OneExceptionFuture(final I2ExnFactory<? extends V, ? extends X, ? extends RuntimeException> cl) {
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super(cl, RuntimeException.class);
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}
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}
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private final Class<X2> exnClass;
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public ExceptionFuture(final I2ExnFactory<? extends V, ? extends X, ? extends X2> cl, final Class<X2> exnClass) {
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super(cl::createChecked);
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this.exnClass = exnClass;
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}
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public final V getWithOriginalException() throws InterruptedException, X, X2 {
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try {
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return this.get();
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} catch (ExecutionException e) {
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final Throwable cause = e.getCause();
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if (cause instanceof Error) {
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throw (Error) cause;
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} else if (cause instanceof RuntimeException) {
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throw (RuntimeException) cause;
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// Not strictly necessary but it feels more robust than to cast "cause" to X even
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// when it's really X2
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} else if (this.exnClass.isInstance(cause)) {
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throw this.exnClass.cast(cause);
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} else {
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// our Callable throws X or X2 but the latter is already handled above.
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@SuppressWarnings("unchecked")
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final X casted = (X) cause;
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throw casted;
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}
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}
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}
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}
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